From support at kartmanager.de  Mon May 14 08:43:08 2007
From: support at kartmanager.de (Andre Geisler)
Date: Mon, 14 May 2007 16:43:08 +0200
Subject: [Rxtx] Problem on closing Ports
Message-ID: <4648757C.8080601@kartmanager.de>

Hello,

i have got a small problem on closing serail ports.
The following class manages the my serials connection an
is handeled by an object calles kbn which lays in a java
swin gui:

public class Serial implements SerialPortEventListener{
   
    private static CommPortIdentifier portId;
    private static Enumeration          portList;
    private InputStream              inputStream;
    private OutputStream        outputStream;
    private SerialPort              serialPort;
    private AmbHandler ambh = new AmbHandler();
    private String              defaultPort = "/dev/ttyS0";
    private Kartbahnnutzung kbn;
   
    public Serial() {}
   
    public void connect(){
        boolean              portFound = false;
      
        portList = CommPortIdentifier.getPortIdentifiers();

        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                if (portId.getName().equals(defaultPort)) {
                    System.out.println("Found port: "+defaultPort);
                    portFound = true;
                }
            }
        }
        if (!portFound) {
            System.out.println("port " + defaultPort + " not found.");
        }
       
        try {
            serialPort = (SerialPort) portId.open("Kartman Read Thread", 
2000);
        } catch (PortInUseException e) {}

        try {
            inputStream = serialPort.getInputStream();
            outputStream = serialPort.getOutputStream();
        } catch (IOException e) {}

        try {
            serialPort.addEventListener(this);
        } catch (TooManyListenersException e) {}

        serialPort.notifyOnDataAvailable(true);

        try {
            serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,
                           SerialPort.STOPBITS_2,
                           SerialPort.PARITY_NONE);
        } catch (UnsupportedCommOperationException e){}
        
    }

    public void serialEvent(SerialPortEvent event) {
        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
            break;

        case SerialPortEvent.DATA_AVAILABLE:
            byte[] readBuffer =new byte[25];
           
       
           int numBytes=0;
            try {
               
            while (inputStream.available() > 0) {
                numBytes = inputStream.read(readBuffer);
                System.out.println("String: "+ new 
String(readBuffer,0,numBytes));
                System.out.println("Anzahl der bytes: "+numBytes);
                ambh.newMessage(new String(readBuffer,0,numBytes));
                readBuffer = new byte[25];
            }
            if(ambh.isPacketComplete()){
                System.out.println("Complete packet? 
"+ambh.isPacketComplete());
                kbn.addErgebnis(ambh.getLastPacket());
                System.out.println("Letzte 
Nachricht:"+ambh.getLastPacket().getMessage());
            }
            } catch (IOException e) {System.out.println("Ups!");}

            break;
        }
    }
   
    public void simpleWrite(char c){
       
        try{               
           
            this.outputStream.write(c);
                           
        }catch ( IOException e ){
            e.printStackTrace();
        }           
    }
   
    public void disconnect(){
        serialPort.removeEventListener();
        serialPort.close();
        System.out.println(defaultPort+" is closed!");
    }
   
    public ArrayList<AmbPacket> getAmbArray(){
        return ambh.getPacketarr();
    }
    public void setKartbahnnutzung(Kartbahnnutzung kbn){
        this.kbn=kbn;
    }

}

I have got a button called which closes the connection.
Everything is ok, it is calling an method from kbn which calls
serialcon.disconnect();

But there is also the possibility that the kbn object closes the 
connection it self.
It uses the same function "serial.disconnect()". The function itself is 
startetd,
but it does not close the connection. Nothing els happens, no exception, 
no ...
The program stops, and else happens.
Is there a better way to close this connection???

regards

-- 
Mit freundlichen Gr??en

Andr? Geisler
http://www.kartmanager.de
support at kartmanager.de



From rithy8 at gmail.com  Mon May 14 12:16:39 2007
From: rithy8 at gmail.com (rithy roth)
Date: Mon, 14 May 2007 11:16:39 -0700
Subject: [Rxtx] please help on when read time out occurs
Message-ID: <79e2547b0705141116q6138850sdb937a6fe74b5eb3@mail.gmail.com>

Hi,

I've been looking for some doc regarding what enableReceiveTimeout() is
doing( which event is generated) when a read time out occurs. Also, I am not
sure myself what to do in my code when a timeout happens. Could someone
please
help?

Thanks

========================================

Here is a portion of my code:

After opening my serial port, I issued the following:
...
     try {
        sPort.enableReceiveTimeout(30);
    } catch (UnsupportedCommOperationException e) {
         throw new SerialConnectionException("Enable Receive Timeout not
supported");
    }
...

Then, on my read I just have a listener on event notification:

   public void serialEvent(SerialPortEvent e) {

    // Create a StringBuffer and int to receive input data.
    StringBuffer inputBuffer = new StringBuffer();
    int         newData = 0;

    // Determine type of event.
    switch (e.getEventType()) {

    // Read data until -1 is returned. If \r is received substitute
    // \n for correct newline handling.
    case SerialPortEvent.DATA_AVAILABLE:
           // System.out.println("data available");
        while (newData != -1) {
        try {
           newData = is.read();

           if (newData == -1) {
            break;
            }


            inputBuffer.append((char) newData);

        } catch (IOException ex) {
         System.err.println(ex);

            return;
        }
      }

        break;

    // If break event append BREAK RECEIVED message.
    case SerialPortEvent.BI:
       // messageAreaIn.append("\n--- BREAK RECEIVED ---\n");
             Utils.debugprint("\n--- BREAK RECEIVED ---\n");
    }
    }
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From info at haberkamp.com  Tue May 15 04:27:10 2007
From: info at haberkamp.com (Guido Haberkamp IT-Beratung)
Date: Tue, 15 May 2007 12:27:10 +0200
Subject: [Rxtx] CommPortIdentifier "hangs"
Message-ID: <46498AFE.7050307@haberkamp.com>

Hello,

I couldn't find a solution to my problem or even anybody else mentioning
this problem on the net, so I'm asking you all for help.

I'm trying to use rxtx2.1.7 But when I try to get the portId from
CommPortIdentifier.getPortIdentifier("COM1")
It takes 3min50sec for the method to return the value.
After that everything works fine.

Connecting via Hyperterminal to the same port shows no noticable delay


I'll include my code at the end of this posting

Thanks for your help.
Guido


Here some details to my programming environment:

Windows 2000 Prof.
IBM T23 with one built-in Comport ("COM1"),
another one via USB-Serial Adapter (ATEN, COM5 or COM8)
COM10-17 are assigned because of a VS Netcom Device that connects 8
Serial ports over one tcp/ip link

Eclipse 3.2.2
Java 1.5.0
rxtx-2.1-7r2


I'm new to Java programming in general and serial port communication in
particular, so I'd really appreciate  also some hints if I use rxtx
completely the wrong way.

at Captain.at there's a code example that iterates through all available
ports (including parallel ports), but that code gave me many strange
exceptions,
so I changed it to opening the required port directly.


Here's my code:

import gnu.io.CommPort;

import gnu.io.CommPortIdentifier;

import gnu.io.NoSuchPortException;

import gnu.io.PortInUseException;

import gnu.io.SerialPort;

import gnu.io.SerialPortEvent;

import gnu.io.SerialPortEventListener;

import gnu.io.UnsupportedCommOperationException;



import java.io.BufferedReader;

import java.io.FileDescriptor;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.util.Date;

import java.util.Enumeration;

import java.util.TooManyListenersException;

import java.util.prefs.Preferences;

import logic.Parser;



/**

 * TODO Add comment here

 * @author  $Author:  $

 * @version  $Revision:  $, $Date:  $ UTC

 */

public class SerialCommunicator implements SerialPortEventListener

{

    static CommPortIdentifier portId = null;

    static Enumeration portList = null;

    String appName = null;

    private int baudRate = 0;

    private String device = null;

//    InputStream in = null;

    BufferedReader in = null;

    private String lineRead = null;

    OutputStream out = null;

    private Parser parser = null;

    private String portName = null;

    private Preferences prefs = null;

    public Thread readerThread = null;

    private SerialPort serialPort = null;

    int timeout = 0;

    public Thread writerThread = null;



    public SerialCommunicator(Parser p, Preferences pr, String dev)

    {



        super();

        this.parser = p;

        this.prefs = pr;

        this.device = dev;

//        TODO: assertions p, pr, d != null

        Preferences node = prefs.node("General");

        this.timeout = node.getInt("timeout", 0);

        node = prefs.node(device);

        this.portName = node.get("portName", null);

        this.baudRate = node.getInt("baudRate", 0);

        this.appName = node.get("appName", null);



        System.out.println("Trying to connect to port "+portName);

        Date date = new Date();

        System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        if (foundPort(portName)){

            try {

                connect();

            } catch (Exception e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

            date = new Date();

            System.out.println("Connected to port "+portName);

            System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        }

        else {

            System.out.println("Could not connect");

        }

    }



    boolean foundPort (String port){

        boolean portFound = false;

        try {

//            portId = CommPortIdentifier.getPortIdentifier(port);

            portId = CommPortIdentifier.getPortIdentifier("COM5");

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        if ( portId.isCurrentlyOwned() )

        {

            System.out.println("Error: Port is currently in use");

        }

        else {

            portFound = true;

        }

        return portFound;

    }

    void connect () throws Exception

    {

        this.openPort(portName);

        this.setInputStream();

        this.setParameters();

    }

    void openPort (String port){



        try {

            serialPort = (SerialPort) portId.open(appName, timeout);

        } catch (PortInUseException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }



    void setInputStream (){

        try {

            this.in = new BufferedReader(new
InputStreamReader(this.serialPort.getInputStream()));

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        serialPort.notifyOnDataAvailable(true);

        try {

            serialPort.addEventListener(this);

        } catch (TooManyListenersException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }



    }





    void setParameters(){

        try {

            this.serialPort.setSerialPortParams(baudRate,
SerialPort.DATABITS_8, SerialPort.STOPBITS_1,

                    SerialPort.PARITY_NONE);

        } catch (UnsupportedCommOperationException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }











    public void serialEvent(SerialPortEvent event) {

        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:

            break;

        case SerialPortEvent.DATA_AVAILABLE:

            try {

                this.lineRead = this.in.readLine();

                System.out.println("Read: "+lineRead);

            }

            catch (IOException e) {}



            break;

        }

    }





}


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From murato at mobiliz.com.tr  Wed May 16 06:58:50 2007
From: murato at mobiliz.com.tr (Murat Ozdemir)
Date: Wed, 16 May 2007 15:58:50 +0300
Subject: [Rxtx] java.io.IOException: No error in nativeDrain
Message-ID: <E3BF513AF070D741AE92D4780D6813A314A2EE@mobilizdc.mobiliz.com.tr>

Hello all,
i'm using RXTX 2.1 with JSmsLib 2.1.0
 
When i'm trying to run that framework, i'm getting exceptions from RXTX
Library as;
 
java.io.IOException: No error in nativeDrain
at gnu.io.RXTXPort.nativeDrain(Native Method)
at gnu.io.RXTXPort$SerialOutputStream.flush(RXTXPort.java:1201)
at org.smslib.CSerialDriver.send(CSerialDriver.java:206)
at org.smslib.handler.CATHandler.sync(CATHandler.java:43)
at org.smslib.CService.connect(CService.java:539)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.doIt(ReadMessagesAsync.java:92)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.main(ReadMessagesAsync.java:140)
 
 
Also, 
when i've read the README for rxtxSerial.dll faced that;
 
Wed Mar  1 12:01:05 MST 2006
rxtxSerial.dll had to be recomopiled to link in missing native methods.
 
what should i do? How can i recompile the dll?
 
---------------
Murat OZDEMiR
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From support at kartmanager.de  Mon May 14 08:43:08 2007
From: support at kartmanager.de (Andre Geisler)
Date: Mon, 14 May 2007 16:43:08 +0200
Subject: [Rxtx] Problem on closing Ports
Message-ID: <4648757C.8080601@kartmanager.de>

Hello,

i have got a small problem on closing serail ports.
The following class manages the my serials connection an
is handeled by an object calles kbn which lays in a java
swin gui:

public class Serial implements SerialPortEventListener{
   
    private static CommPortIdentifier portId;
    private static Enumeration          portList;
    private InputStream              inputStream;
    private OutputStream        outputStream;
    private SerialPort              serialPort;
    private AmbHandler ambh = new AmbHandler();
    private String              defaultPort = "/dev/ttyS0";
    private Kartbahnnutzung kbn;
   
    public Serial() {}
   
    public void connect(){
        boolean              portFound = false;
      
        portList = CommPortIdentifier.getPortIdentifiers();

        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                if (portId.getName().equals(defaultPort)) {
                    System.out.println("Found port: "+defaultPort);
                    portFound = true;
                }
            }
        }
        if (!portFound) {
            System.out.println("port " + defaultPort + " not found.");
        }
       
        try {
            serialPort = (SerialPort) portId.open("Kartman Read Thread", 
2000);
        } catch (PortInUseException e) {}

        try {
            inputStream = serialPort.getInputStream();
            outputStream = serialPort.getOutputStream();
        } catch (IOException e) {}

        try {
            serialPort.addEventListener(this);
        } catch (TooManyListenersException e) {}

        serialPort.notifyOnDataAvailable(true);

        try {
            serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,
                           SerialPort.STOPBITS_2,
                           SerialPort.PARITY_NONE);
        } catch (UnsupportedCommOperationException e){}
        
    }

    public void serialEvent(SerialPortEvent event) {
        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
            break;

        case SerialPortEvent.DATA_AVAILABLE:
            byte[] readBuffer =new byte[25];
           
       
           int numBytes=0;
            try {
               
            while (inputStream.available() > 0) {
                numBytes = inputStream.read(readBuffer);
                System.out.println("String: "+ new 
String(readBuffer,0,numBytes));
                System.out.println("Anzahl der bytes: "+numBytes);
                ambh.newMessage(new String(readBuffer,0,numBytes));
                readBuffer = new byte[25];
            }
            if(ambh.isPacketComplete()){
                System.out.println("Complete packet? 
"+ambh.isPacketComplete());
                kbn.addErgebnis(ambh.getLastPacket());
                System.out.println("Letzte 
Nachricht:"+ambh.getLastPacket().getMessage());
            }
            } catch (IOException e) {System.out.println("Ups!");}

            break;
        }
    }
   
    public void simpleWrite(char c){
       
        try{               
           
            this.outputStream.write(c);
                           
        }catch ( IOException e ){
            e.printStackTrace();
        }           
    }
   
    public void disconnect(){
        serialPort.removeEventListener();
        serialPort.close();
        System.out.println(defaultPort+" is closed!");
    }
   
    public ArrayList<AmbPacket> getAmbArray(){
        return ambh.getPacketarr();
    }
    public void setKartbahnnutzung(Kartbahnnutzung kbn){
        this.kbn=kbn;
    }

}

I have got a button called which closes the connection.
Everything is ok, it is calling an method from kbn which calls
serialcon.disconnect();

But there is also the possibility that the kbn object closes the 
connection it self.
It uses the same function "serial.disconnect()". The function itself is 
startetd,
but it does not close the connection. Nothing els happens, no exception, 
no ...
The program stops, and else happens.
Is there a better way to close this connection???

regards

-- 
Mit freundlichen Gr??en

Andr? Geisler
http://www.kartmanager.de
support at kartmanager.de



From rithy8 at gmail.com  Mon May 14 12:16:39 2007
From: rithy8 at gmail.com (rithy roth)
Date: Mon, 14 May 2007 11:16:39 -0700
Subject: [Rxtx] please help on when read time out occurs
Message-ID: <79e2547b0705141116q6138850sdb937a6fe74b5eb3@mail.gmail.com>

Hi,

I've been looking for some doc regarding what enableReceiveTimeout() is
doing( which event is generated) when a read time out occurs. Also, I am not
sure myself what to do in my code when a timeout happens. Could someone
please
help?

Thanks

========================================

Here is a portion of my code:

After opening my serial port, I issued the following:
...
     try {
        sPort.enableReceiveTimeout(30);
    } catch (UnsupportedCommOperationException e) {
         throw new SerialConnectionException("Enable Receive Timeout not
supported");
    }
...

Then, on my read I just have a listener on event notification:

   public void serialEvent(SerialPortEvent e) {

    // Create a StringBuffer and int to receive input data.
    StringBuffer inputBuffer = new StringBuffer();
    int         newData = 0;

    // Determine type of event.
    switch (e.getEventType()) {

    // Read data until -1 is returned. If \r is received substitute
    // \n for correct newline handling.
    case SerialPortEvent.DATA_AVAILABLE:
           // System.out.println("data available");
        while (newData != -1) {
        try {
           newData = is.read();

           if (newData == -1) {
            break;
            }


            inputBuffer.append((char) newData);

        } catch (IOException ex) {
         System.err.println(ex);

            return;
        }
      }

        break;

    // If break event append BREAK RECEIVED message.
    case SerialPortEvent.BI:
       // messageAreaIn.append("\n--- BREAK RECEIVED ---\n");
             Utils.debugprint("\n--- BREAK RECEIVED ---\n");
    }
    }
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From info at haberkamp.com  Tue May 15 04:27:10 2007
From: info at haberkamp.com (Guido Haberkamp IT-Beratung)
Date: Tue, 15 May 2007 12:27:10 +0200
Subject: [Rxtx] CommPortIdentifier "hangs"
Message-ID: <46498AFE.7050307@haberkamp.com>

Hello,

I couldn't find a solution to my problem or even anybody else mentioning
this problem on the net, so I'm asking you all for help.

I'm trying to use rxtx2.1.7 But when I try to get the portId from
CommPortIdentifier.getPortIdentifier("COM1")
It takes 3min50sec for the method to return the value.
After that everything works fine.

Connecting via Hyperterminal to the same port shows no noticable delay


I'll include my code at the end of this posting

Thanks for your help.
Guido


Here some details to my programming environment:

Windows 2000 Prof.
IBM T23 with one built-in Comport ("COM1"),
another one via USB-Serial Adapter (ATEN, COM5 or COM8)
COM10-17 are assigned because of a VS Netcom Device that connects 8
Serial ports over one tcp/ip link

Eclipse 3.2.2
Java 1.5.0
rxtx-2.1-7r2


I'm new to Java programming in general and serial port communication in
particular, so I'd really appreciate  also some hints if I use rxtx
completely the wrong way.

at Captain.at there's a code example that iterates through all available
ports (including parallel ports), but that code gave me many strange
exceptions,
so I changed it to opening the required port directly.


Here's my code:

import gnu.io.CommPort;

import gnu.io.CommPortIdentifier;

import gnu.io.NoSuchPortException;

import gnu.io.PortInUseException;

import gnu.io.SerialPort;

import gnu.io.SerialPortEvent;

import gnu.io.SerialPortEventListener;

import gnu.io.UnsupportedCommOperationException;



import java.io.BufferedReader;

import java.io.FileDescriptor;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.util.Date;

import java.util.Enumeration;

import java.util.TooManyListenersException;

import java.util.prefs.Preferences;

import logic.Parser;



/**

 * TODO Add comment here

 * @author  $Author:  $

 * @version  $Revision:  $, $Date:  $ UTC

 */

public class SerialCommunicator implements SerialPortEventListener

{

    static CommPortIdentifier portId = null;

    static Enumeration portList = null;

    String appName = null;

    private int baudRate = 0;

    private String device = null;

//    InputStream in = null;

    BufferedReader in = null;

    private String lineRead = null;

    OutputStream out = null;

    private Parser parser = null;

    private String portName = null;

    private Preferences prefs = null;

    public Thread readerThread = null;

    private SerialPort serialPort = null;

    int timeout = 0;

    public Thread writerThread = null;



    public SerialCommunicator(Parser p, Preferences pr, String dev)

    {



        super();

        this.parser = p;

        this.prefs = pr;

        this.device = dev;

//        TODO: assertions p, pr, d != null

        Preferences node = prefs.node("General");

        this.timeout = node.getInt("timeout", 0);

        node = prefs.node(device);

        this.portName = node.get("portName", null);

        this.baudRate = node.getInt("baudRate", 0);

        this.appName = node.get("appName", null);



        System.out.println("Trying to connect to port "+portName);

        Date date = new Date();

        System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        if (foundPort(portName)){

            try {

                connect();

            } catch (Exception e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

            date = new Date();

            System.out.println("Connected to port "+portName);

            System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        }

        else {

            System.out.println("Could not connect");

        }

    }



    boolean foundPort (String port){

        boolean portFound = false;

        try {

//            portId = CommPortIdentifier.getPortIdentifier(port);

            portId = CommPortIdentifier.getPortIdentifier("COM5");

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        if ( portId.isCurrentlyOwned() )

        {

            System.out.println("Error: Port is currently in use");

        }

        else {

            portFound = true;

        }

        return portFound;

    }

    void connect () throws Exception

    {

        this.openPort(portName);

        this.setInputStream();

        this.setParameters();

    }

    void openPort (String port){



        try {

            serialPort = (SerialPort) portId.open(appName, timeout);

        } catch (PortInUseException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }



    void setInputStream (){

        try {

            this.in = new BufferedReader(new
InputStreamReader(this.serialPort.getInputStream()));

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        serialPort.notifyOnDataAvailable(true);

        try {

            serialPort.addEventListener(this);

        } catch (TooManyListenersException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }



    }





    void setParameters(){

        try {

            this.serialPort.setSerialPortParams(baudRate,
SerialPort.DATABITS_8, SerialPort.STOPBITS_1,

                    SerialPort.PARITY_NONE);

        } catch (UnsupportedCommOperationException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }











    public void serialEvent(SerialPortEvent event) {

        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:

            break;

        case SerialPortEvent.DATA_AVAILABLE:

            try {

                this.lineRead = this.in.readLine();

                System.out.println("Read: "+lineRead);

            }

            catch (IOException e) {}



            break;

        }

    }





}


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From murato at mobiliz.com.tr  Wed May 16 06:58:50 2007
From: murato at mobiliz.com.tr (Murat Ozdemir)
Date: Wed, 16 May 2007 15:58:50 +0300
Subject: [Rxtx] java.io.IOException: No error in nativeDrain
Message-ID: <E3BF513AF070D741AE92D4780D6813A314A2EE@mobilizdc.mobiliz.com.tr>

Hello all,
i'm using RXTX 2.1 with JSmsLib 2.1.0
 
When i'm trying to run that framework, i'm getting exceptions from RXTX
Library as;
 
java.io.IOException: No error in nativeDrain
at gnu.io.RXTXPort.nativeDrain(Native Method)
at gnu.io.RXTXPort$SerialOutputStream.flush(RXTXPort.java:1201)
at org.smslib.CSerialDriver.send(CSerialDriver.java:206)
at org.smslib.handler.CATHandler.sync(CATHandler.java:43)
at org.smslib.CService.connect(CService.java:539)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.doIt(ReadMessagesAsync.java:92)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.main(ReadMessagesAsync.java:140)
 
 
Also, 
when i've read the README for rxtxSerial.dll faced that;
 
Wed Mar  1 12:01:05 MST 2006
rxtxSerial.dll had to be recomopiled to link in missing native methods.
 
what should i do? How can i recompile the dll?
 
---------------
Murat OZDEMiR
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From Alec.Cawley at quantel.com  Thu May 17 06:14:45 2007
From: Alec.Cawley at quantel.com (Alec.Cawley@quantel.com)
Date: Thu, 17 May 2007 13:14:45 +0100
Subject: [Rxtx] Source or javadox for javax.comm API
Message-ID: <OFCB4EC68D.D9F23803-ON802572DE.004266E0-802572DE.00434257@Research.Quantel>

I want to access serial ports on Windows from Java. I get think I 
understand how to compile and run - put RXTXcomm.jar in my classpath, put 
the appropriate DLLs in the DLL search path. But what about me? How do I 
lean how to use it? There is no javax.comm in the api Javadoc with the 
JAVA SDK 6.1, and I can only find on-line javadoc for it. I would prefer 
not to be dependant on on-line resources *all* the time. Is there 
somewhere I can download javax.comm.java or a bundle of the Javadocs 
generated from it?

Alec Cawley

-- 
This e-mail is intended for the named addressees only. Its contents may be 
privileged or confidential and should be treated as such. If you are not 
an intended recipient please notify the sender immediately and then delete 
it;  do not copy, distribute, or take any action based on this e-mail. In 
the pursuit of its legitimate business activities and its conformance with 
relevant legislation, Quantel may access any e-mail (including 
attachments) it originates or receives, for potential scrutiny. 

Quantel is the trade name used by Quantel Holdings Limited and its 
subsidiaries.  Quantel Holdings Limited is registered in England & Wales. 
Registration No: 4004913 
Contact details for all Quantel Offices and Companies can be found on our 
website www.quantel.com or by writing to the holding company.
Registered address: Turnpike Road, Newbury, Berkshire, RG14 2NX, United 
Kingdom 

From support at kartmanager.de  Mon May 14 08:43:08 2007
From: support at kartmanager.de (Andre Geisler)
Date: Mon, 14 May 2007 16:43:08 +0200
Subject: [Rxtx] Problem on closing Ports
Message-ID: <4648757C.8080601@kartmanager.de>

Hello,

i have got a small problem on closing serail ports.
The following class manages the my serials connection an
is handeled by an object calles kbn which lays in a java
swin gui:

public class Serial implements SerialPortEventListener{
   
    private static CommPortIdentifier portId;
    private static Enumeration          portList;
    private InputStream              inputStream;
    private OutputStream        outputStream;
    private SerialPort              serialPort;
    private AmbHandler ambh = new AmbHandler();
    private String              defaultPort = "/dev/ttyS0";
    private Kartbahnnutzung kbn;
   
    public Serial() {}
   
    public void connect(){
        boolean              portFound = false;
      
        portList = CommPortIdentifier.getPortIdentifiers();

        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                if (portId.getName().equals(defaultPort)) {
                    System.out.println("Found port: "+defaultPort);
                    portFound = true;
                }
            }
        }
        if (!portFound) {
            System.out.println("port " + defaultPort + " not found.");
        }
       
        try {
            serialPort = (SerialPort) portId.open("Kartman Read Thread", 
2000);
        } catch (PortInUseException e) {}

        try {
            inputStream = serialPort.getInputStream();
            outputStream = serialPort.getOutputStream();
        } catch (IOException e) {}

        try {
            serialPort.addEventListener(this);
        } catch (TooManyListenersException e) {}

        serialPort.notifyOnDataAvailable(true);

        try {
            serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,
                           SerialPort.STOPBITS_2,
                           SerialPort.PARITY_NONE);
        } catch (UnsupportedCommOperationException e){}
        
    }

    public void serialEvent(SerialPortEvent event) {
        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
            break;

        case SerialPortEvent.DATA_AVAILABLE:
            byte[] readBuffer =new byte[25];
           
       
           int numBytes=0;
            try {
               
            while (inputStream.available() > 0) {
                numBytes = inputStream.read(readBuffer);
                System.out.println("String: "+ new 
String(readBuffer,0,numBytes));
                System.out.println("Anzahl der bytes: "+numBytes);
                ambh.newMessage(new String(readBuffer,0,numBytes));
                readBuffer = new byte[25];
            }
            if(ambh.isPacketComplete()){
                System.out.println("Complete packet? 
"+ambh.isPacketComplete());
                kbn.addErgebnis(ambh.getLastPacket());
                System.out.println("Letzte 
Nachricht:"+ambh.getLastPacket().getMessage());
            }
            } catch (IOException e) {System.out.println("Ups!");}

            break;
        }
    }
   
    public void simpleWrite(char c){
       
        try{               
           
            this.outputStream.write(c);
                           
        }catch ( IOException e ){
            e.printStackTrace();
        }           
    }
   
    public void disconnect(){
        serialPort.removeEventListener();
        serialPort.close();
        System.out.println(defaultPort+" is closed!");
    }
   
    public ArrayList<AmbPacket> getAmbArray(){
        return ambh.getPacketarr();
    }
    public void setKartbahnnutzung(Kartbahnnutzung kbn){
        this.kbn=kbn;
    }

}

I have got a button called which closes the connection.
Everything is ok, it is calling an method from kbn which calls
serialcon.disconnect();

But there is also the possibility that the kbn object closes the 
connection it self.
It uses the same function "serial.disconnect()". The function itself is 
startetd,
but it does not close the connection. Nothing els happens, no exception, 
no ...
The program stops, and else happens.
Is there a better way to close this connection???

regards

-- 
Mit freundlichen Gr??en

Andr? Geisler
http://www.kartmanager.de
support at kartmanager.de



From rithy8 at gmail.com  Mon May 14 12:16:39 2007
From: rithy8 at gmail.com (rithy roth)
Date: Mon, 14 May 2007 11:16:39 -0700
Subject: [Rxtx] please help on when read time out occurs
Message-ID: <79e2547b0705141116q6138850sdb937a6fe74b5eb3@mail.gmail.com>

Hi,

I've been looking for some doc regarding what enableReceiveTimeout() is
doing( which event is generated) when a read time out occurs. Also, I am not
sure myself what to do in my code when a timeout happens. Could someone
please
help?

Thanks

========================================

Here is a portion of my code:

After opening my serial port, I issued the following:
...
     try {
        sPort.enableReceiveTimeout(30);
    } catch (UnsupportedCommOperationException e) {
         throw new SerialConnectionException("Enable Receive Timeout not
supported");
    }
...

Then, on my read I just have a listener on event notification:

   public void serialEvent(SerialPortEvent e) {

    // Create a StringBuffer and int to receive input data.
    StringBuffer inputBuffer = new StringBuffer();
    int         newData = 0;

    // Determine type of event.
    switch (e.getEventType()) {

    // Read data until -1 is returned. If \r is received substitute
    // \n for correct newline handling.
    case SerialPortEvent.DATA_AVAILABLE:
           // System.out.println("data available");
        while (newData != -1) {
        try {
           newData = is.read();

           if (newData == -1) {
            break;
            }


            inputBuffer.append((char) newData);

        } catch (IOException ex) {
         System.err.println(ex);

            return;
        }
      }

        break;

    // If break event append BREAK RECEIVED message.
    case SerialPortEvent.BI:
       // messageAreaIn.append("\n--- BREAK RECEIVED ---\n");
             Utils.debugprint("\n--- BREAK RECEIVED ---\n");
    }
    }
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From info at haberkamp.com  Tue May 15 04:27:10 2007
From: info at haberkamp.com (Guido Haberkamp IT-Beratung)
Date: Tue, 15 May 2007 12:27:10 +0200
Subject: [Rxtx] CommPortIdentifier "hangs"
Message-ID: <46498AFE.7050307@haberkamp.com>

Hello,

I couldn't find a solution to my problem or even anybody else mentioning
this problem on the net, so I'm asking you all for help.

I'm trying to use rxtx2.1.7 But when I try to get the portId from
CommPortIdentifier.getPortIdentifier("COM1")
It takes 3min50sec for the method to return the value.
After that everything works fine.

Connecting via Hyperterminal to the same port shows no noticable delay


I'll include my code at the end of this posting

Thanks for your help.
Guido


Here some details to my programming environment:

Windows 2000 Prof.
IBM T23 with one built-in Comport ("COM1"),
another one via USB-Serial Adapter (ATEN, COM5 or COM8)
COM10-17 are assigned because of a VS Netcom Device that connects 8
Serial ports over one tcp/ip link

Eclipse 3.2.2
Java 1.5.0
rxtx-2.1-7r2


I'm new to Java programming in general and serial port communication in
particular, so I'd really appreciate  also some hints if I use rxtx
completely the wrong way.

at Captain.at there's a code example that iterates through all available
ports (including parallel ports), but that code gave me many strange
exceptions,
so I changed it to opening the required port directly.


Here's my code:

import gnu.io.CommPort;

import gnu.io.CommPortIdentifier;

import gnu.io.NoSuchPortException;

import gnu.io.PortInUseException;

import gnu.io.SerialPort;

import gnu.io.SerialPortEvent;

import gnu.io.SerialPortEventListener;

import gnu.io.UnsupportedCommOperationException;



import java.io.BufferedReader;

import java.io.FileDescriptor;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.util.Date;

import java.util.Enumeration;

import java.util.TooManyListenersException;

import java.util.prefs.Preferences;

import logic.Parser;



/**

 * TODO Add comment here

 * @author  $Author:  $

 * @version  $Revision:  $, $Date:  $ UTC

 */

public class SerialCommunicator implements SerialPortEventListener

{

    static CommPortIdentifier portId = null;

    static Enumeration portList = null;

    String appName = null;

    private int baudRate = 0;

    private String device = null;

//    InputStream in = null;

    BufferedReader in = null;

    private String lineRead = null;

    OutputStream out = null;

    private Parser parser = null;

    private String portName = null;

    private Preferences prefs = null;

    public Thread readerThread = null;

    private SerialPort serialPort = null;

    int timeout = 0;

    public Thread writerThread = null;



    public SerialCommunicator(Parser p, Preferences pr, String dev)

    {



        super();

        this.parser = p;

        this.prefs = pr;

        this.device = dev;

//        TODO: assertions p, pr, d != null

        Preferences node = prefs.node("General");

        this.timeout = node.getInt("timeout", 0);

        node = prefs.node(device);

        this.portName = node.get("portName", null);

        this.baudRate = node.getInt("baudRate", 0);

        this.appName = node.get("appName", null);



        System.out.println("Trying to connect to port "+portName);

        Date date = new Date();

        System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        if (foundPort(portName)){

            try {

                connect();

            } catch (Exception e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

            date = new Date();

            System.out.println("Connected to port "+portName);

            System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        }

        else {

            System.out.println("Could not connect");

        }

    }



    boolean foundPort (String port){

        boolean portFound = false;

        try {

//            portId = CommPortIdentifier.getPortIdentifier(port);

            portId = CommPortIdentifier.getPortIdentifier("COM5");

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        if ( portId.isCurrentlyOwned() )

        {

            System.out.println("Error: Port is currently in use");

        }

        else {

            portFound = true;

        }

        return portFound;

    }

    void connect () throws Exception

    {

        this.openPort(portName);

        this.setInputStream();

        this.setParameters();

    }

    void openPort (String port){



        try {

            serialPort = (SerialPort) portId.open(appName, timeout);

        } catch (PortInUseException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }



    void setInputStream (){

        try {

            this.in = new BufferedReader(new
InputStreamReader(this.serialPort.getInputStream()));

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        serialPort.notifyOnDataAvailable(true);

        try {

            serialPort.addEventListener(this);

        } catch (TooManyListenersException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }



    }





    void setParameters(){

        try {

            this.serialPort.setSerialPortParams(baudRate,
SerialPort.DATABITS_8, SerialPort.STOPBITS_1,

                    SerialPort.PARITY_NONE);

        } catch (UnsupportedCommOperationException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }











    public void serialEvent(SerialPortEvent event) {

        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:

            break;

        case SerialPortEvent.DATA_AVAILABLE:

            try {

                this.lineRead = this.in.readLine();

                System.out.println("Read: "+lineRead);

            }

            catch (IOException e) {}



            break;

        }

    }





}


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From murato at mobiliz.com.tr  Wed May 16 06:58:50 2007
From: murato at mobiliz.com.tr (Murat Ozdemir)
Date: Wed, 16 May 2007 15:58:50 +0300
Subject: [Rxtx] java.io.IOException: No error in nativeDrain
Message-ID: <E3BF513AF070D741AE92D4780D6813A314A2EE@mobilizdc.mobiliz.com.tr>

Hello all,
i'm using RXTX 2.1 with JSmsLib 2.1.0
 
When i'm trying to run that framework, i'm getting exceptions from RXTX
Library as;
 
java.io.IOException: No error in nativeDrain
at gnu.io.RXTXPort.nativeDrain(Native Method)
at gnu.io.RXTXPort$SerialOutputStream.flush(RXTXPort.java:1201)
at org.smslib.CSerialDriver.send(CSerialDriver.java:206)
at org.smslib.handler.CATHandler.sync(CATHandler.java:43)
at org.smslib.CService.connect(CService.java:539)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.doIt(ReadMessagesAsync.java:92)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.main(ReadMessagesAsync.java:140)
 
 
Also, 
when i've read the README for rxtxSerial.dll faced that;
 
Wed Mar  1 12:01:05 MST 2006
rxtxSerial.dll had to be recomopiled to link in missing native methods.
 
what should i do? How can i recompile the dll?
 
---------------
Murat OZDEMiR
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From Alec.Cawley at quantel.com  Thu May 17 06:14:45 2007
From: Alec.Cawley at quantel.com (Alec.Cawley@quantel.com)
Date: Thu, 17 May 2007 13:14:45 +0100
Subject: [Rxtx] Source or javadox for javax.comm API
Message-ID: <OFCB4EC68D.D9F23803-ON802572DE.004266E0-802572DE.00434257@Research.Quantel>

I want to access serial ports on Windows from Java. I get think I 
understand how to compile and run - put RXTXcomm.jar in my classpath, put 
the appropriate DLLs in the DLL search path. But what about me? How do I 
lean how to use it? There is no javax.comm in the api Javadoc with the 
JAVA SDK 6.1, and I can only find on-line javadoc for it. I would prefer 
not to be dependant on on-line resources *all* the time. Is there 
somewhere I can download javax.comm.java or a bundle of the Javadocs 
generated from it?

Alec Cawley

-- 
This e-mail is intended for the named addressees only. Its contents may be 
privileged or confidential and should be treated as such. If you are not 
an intended recipient please notify the sender immediately and then delete 
it;  do not copy, distribute, or take any action based on this e-mail. In 
the pursuit of its legitimate business activities and its conformance with 
relevant legislation, Quantel may access any e-mail (including 
attachments) it originates or receives, for potential scrutiny. 

Quantel is the trade name used by Quantel Holdings Limited and its 
subsidiaries.  Quantel Holdings Limited is registered in England & Wales. 
Registration No: 4004913 
Contact details for all Quantel Offices and Companies can be found on our 
website www.quantel.com or by writing to the holding company.
Registered address: Turnpike Road, Newbury, Berkshire, RG14 2NX, United 
Kingdom 


From support at kartmanager.de  Mon May 14 08:43:08 2007
From: support at kartmanager.de (Andre Geisler)
Date: Mon, 14 May 2007 16:43:08 +0200
Subject: [Rxtx] Problem on closing Ports
Message-ID: <4648757C.8080601@kartmanager.de>

Hello,

i have got a small problem on closing serail ports.
The following class manages the my serials connection an
is handeled by an object calles kbn which lays in a java
swin gui:

public class Serial implements SerialPortEventListener{
   
    private static CommPortIdentifier portId;
    private static Enumeration          portList;
    private InputStream              inputStream;
    private OutputStream        outputStream;
    private SerialPort              serialPort;
    private AmbHandler ambh = new AmbHandler();
    private String              defaultPort = "/dev/ttyS0";
    private Kartbahnnutzung kbn;
   
    public Serial() {}
   
    public void connect(){
        boolean              portFound = false;
      
        portList = CommPortIdentifier.getPortIdentifiers();

        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                if (portId.getName().equals(defaultPort)) {
                    System.out.println("Found port: "+defaultPort);
                    portFound = true;
                }
            }
        }
        if (!portFound) {
            System.out.println("port " + defaultPort + " not found.");
        }
       
        try {
            serialPort = (SerialPort) portId.open("Kartman Read Thread", 
2000);
        } catch (PortInUseException e) {}

        try {
            inputStream = serialPort.getInputStream();
            outputStream = serialPort.getOutputStream();
        } catch (IOException e) {}

        try {
            serialPort.addEventListener(this);
        } catch (TooManyListenersException e) {}

        serialPort.notifyOnDataAvailable(true);

        try {
            serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,
                           SerialPort.STOPBITS_2,
                           SerialPort.PARITY_NONE);
        } catch (UnsupportedCommOperationException e){}
        
    }

    public void serialEvent(SerialPortEvent event) {
        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
            break;

        case SerialPortEvent.DATA_AVAILABLE:
            byte[] readBuffer =new byte[25];
           
       
           int numBytes=0;
            try {
               
            while (inputStream.available() > 0) {
                numBytes = inputStream.read(readBuffer);
                System.out.println("String: "+ new 
String(readBuffer,0,numBytes));
                System.out.println("Anzahl der bytes: "+numBytes);
                ambh.newMessage(new String(readBuffer,0,numBytes));
                readBuffer = new byte[25];
            }
            if(ambh.isPacketComplete()){
                System.out.println("Complete packet? 
"+ambh.isPacketComplete());
                kbn.addErgebnis(ambh.getLastPacket());
                System.out.println("Letzte 
Nachricht:"+ambh.getLastPacket().getMessage());
            }
            } catch (IOException e) {System.out.println("Ups!");}

            break;
        }
    }
   
    public void simpleWrite(char c){
       
        try{               
           
            this.outputStream.write(c);
                           
        }catch ( IOException e ){
            e.printStackTrace();
        }           
    }
   
    public void disconnect(){
        serialPort.removeEventListener();
        serialPort.close();
        System.out.println(defaultPort+" is closed!");
    }
   
    public ArrayList<AmbPacket> getAmbArray(){
        return ambh.getPacketarr();
    }
    public void setKartbahnnutzung(Kartbahnnutzung kbn){
        this.kbn=kbn;
    }

}

I have got a button called which closes the connection.
Everything is ok, it is calling an method from kbn which calls
serialcon.disconnect();

But there is also the possibility that the kbn object closes the 
connection it self.
It uses the same function "serial.disconnect()". The function itself is 
startetd,
but it does not close the connection. Nothing els happens, no exception, 
no ...
The program stops, and else happens.
Is there a better way to close this connection???

regards

-- 
Mit freundlichen Gr??en

Andr? Geisler
http://www.kartmanager.de
support at kartmanager.de



From rithy8 at gmail.com  Mon May 14 12:16:39 2007
From: rithy8 at gmail.com (rithy roth)
Date: Mon, 14 May 2007 11:16:39 -0700
Subject: [Rxtx] please help on when read time out occurs
Message-ID: <79e2547b0705141116q6138850sdb937a6fe74b5eb3@mail.gmail.com>

Hi,

I've been looking for some doc regarding what enableReceiveTimeout() is
doing( which event is generated) when a read time out occurs. Also, I am not
sure myself what to do in my code when a timeout happens. Could someone
please
help?

Thanks

========================================

Here is a portion of my code:

After opening my serial port, I issued the following:
...
     try {
        sPort.enableReceiveTimeout(30);
    } catch (UnsupportedCommOperationException e) {
         throw new SerialConnectionException("Enable Receive Timeout not
supported");
    }
...

Then, on my read I just have a listener on event notification:

   public void serialEvent(SerialPortEvent e) {

    // Create a StringBuffer and int to receive input data.
    StringBuffer inputBuffer = new StringBuffer();
    int         newData = 0;

    // Determine type of event.
    switch (e.getEventType()) {

    // Read data until -1 is returned. If \r is received substitute
    // \n for correct newline handling.
    case SerialPortEvent.DATA_AVAILABLE:
           // System.out.println("data available");
        while (newData != -1) {
        try {
           newData = is.read();

           if (newData == -1) {
            break;
            }


            inputBuffer.append((char) newData);

        } catch (IOException ex) {
         System.err.println(ex);

            return;
        }
      }

        break;

    // If break event append BREAK RECEIVED message.
    case SerialPortEvent.BI:
       // messageAreaIn.append("\n--- BREAK RECEIVED ---\n");
             Utils.debugprint("\n--- BREAK RECEIVED ---\n");
    }
    }
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From info at haberkamp.com  Tue May 15 04:27:10 2007
From: info at haberkamp.com (Guido Haberkamp IT-Beratung)
Date: Tue, 15 May 2007 12:27:10 +0200
Subject: [Rxtx] CommPortIdentifier "hangs"
Message-ID: <46498AFE.7050307@haberkamp.com>

Hello,

I couldn't find a solution to my problem or even anybody else mentioning
this problem on the net, so I'm asking you all for help.

I'm trying to use rxtx2.1.7 But when I try to get the portId from
CommPortIdentifier.getPortIdentifier("COM1")
It takes 3min50sec for the method to return the value.
After that everything works fine.

Connecting via Hyperterminal to the same port shows no noticable delay


I'll include my code at the end of this posting

Thanks for your help.
Guido


Here some details to my programming environment:

Windows 2000 Prof.
IBM T23 with one built-in Comport ("COM1"),
another one via USB-Serial Adapter (ATEN, COM5 or COM8)
COM10-17 are assigned because of a VS Netcom Device that connects 8
Serial ports over one tcp/ip link

Eclipse 3.2.2
Java 1.5.0
rxtx-2.1-7r2


I'm new to Java programming in general and serial port communication in
particular, so I'd really appreciate  also some hints if I use rxtx
completely the wrong way.

at Captain.at there's a code example that iterates through all available
ports (including parallel ports), but that code gave me many strange
exceptions,
so I changed it to opening the required port directly.


Here's my code:

import gnu.io.CommPort;

import gnu.io.CommPortIdentifier;

import gnu.io.NoSuchPortException;

import gnu.io.PortInUseException;

import gnu.io.SerialPort;

import gnu.io.SerialPortEvent;

import gnu.io.SerialPortEventListener;

import gnu.io.UnsupportedCommOperationException;



import java.io.BufferedReader;

import java.io.FileDescriptor;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.util.Date;

import java.util.Enumeration;

import java.util.TooManyListenersException;

import java.util.prefs.Preferences;

import logic.Parser;



/**

 * TODO Add comment here

 * @author  $Author:  $

 * @version  $Revision:  $, $Date:  $ UTC

 */

public class SerialCommunicator implements SerialPortEventListener

{

    static CommPortIdentifier portId = null;

    static Enumeration portList = null;

    String appName = null;

    private int baudRate = 0;

    private String device = null;

//    InputStream in = null;

    BufferedReader in = null;

    private String lineRead = null;

    OutputStream out = null;

    private Parser parser = null;

    private String portName = null;

    private Preferences prefs = null;

    public Thread readerThread = null;

    private SerialPort serialPort = null;

    int timeout = 0;

    public Thread writerThread = null;



    public SerialCommunicator(Parser p, Preferences pr, String dev)

    {



        super();

        this.parser = p;

        this.prefs = pr;

        this.device = dev;

//        TODO: assertions p, pr, d != null

        Preferences node = prefs.node("General");

        this.timeout = node.getInt("timeout", 0);

        node = prefs.node(device);

        this.portName = node.get("portName", null);

        this.baudRate = node.getInt("baudRate", 0);

        this.appName = node.get("appName", null);



        System.out.println("Trying to connect to port "+portName);

        Date date = new Date();

        System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        if (foundPort(portName)){

            try {

                connect();

            } catch (Exception e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

            date = new Date();

            System.out.println("Connected to port "+portName);

            System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        }

        else {

            System.out.println("Could not connect");

        }

    }



    boolean foundPort (String port){

        boolean portFound = false;

        try {

//            portId = CommPortIdentifier.getPortIdentifier(port);

            portId = CommPortIdentifier.getPortIdentifier("COM5");

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        if ( portId.isCurrentlyOwned() )

        {

            System.out.println("Error: Port is currently in use");

        }

        else {

            portFound = true;

        }

        return portFound;

    }

    void connect () throws Exception

    {

        this.openPort(portName);

        this.setInputStream();

        this.setParameters();

    }

    void openPort (String port){



        try {

            serialPort = (SerialPort) portId.open(appName, timeout);

        } catch (PortInUseException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }



    void setInputStream (){

        try {

            this.in = new BufferedReader(new
InputStreamReader(this.serialPort.getInputStream()));

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        serialPort.notifyOnDataAvailable(true);

        try {

            serialPort.addEventListener(this);

        } catch (TooManyListenersException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }



    }





    void setParameters(){

        try {

            this.serialPort.setSerialPortParams(baudRate,
SerialPort.DATABITS_8, SerialPort.STOPBITS_1,

                    SerialPort.PARITY_NONE);

        } catch (UnsupportedCommOperationException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }











    public void serialEvent(SerialPortEvent event) {

        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:

            break;

        case SerialPortEvent.DATA_AVAILABLE:

            try {

                this.lineRead = this.in.readLine();

                System.out.println("Read: "+lineRead);

            }

            catch (IOException e) {}



            break;

        }

    }





}


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From murato at mobiliz.com.tr  Wed May 16 06:58:50 2007
From: murato at mobiliz.com.tr (Murat Ozdemir)
Date: Wed, 16 May 2007 15:58:50 +0300
Subject: [Rxtx] java.io.IOException: No error in nativeDrain
Message-ID: <E3BF513AF070D741AE92D4780D6813A314A2EE@mobilizdc.mobiliz.com.tr>

Hello all,
i'm using RXTX 2.1 with JSmsLib 2.1.0
 
When i'm trying to run that framework, i'm getting exceptions from RXTX
Library as;
 
java.io.IOException: No error in nativeDrain
at gnu.io.RXTXPort.nativeDrain(Native Method)
at gnu.io.RXTXPort$SerialOutputStream.flush(RXTXPort.java:1201)
at org.smslib.CSerialDriver.send(CSerialDriver.java:206)
at org.smslib.handler.CATHandler.sync(CATHandler.java:43)
at org.smslib.CService.connect(CService.java:539)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.doIt(ReadMessagesAsync.java:92)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.main(ReadMessagesAsync.java:140)
 
 
Also, 
when i've read the README for rxtxSerial.dll faced that;
 
Wed Mar  1 12:01:05 MST 2006
rxtxSerial.dll had to be recomopiled to link in missing native methods.
 
what should i do? How can i recompile the dll?
 
---------------
Murat OZDEMiR
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From Alec.Cawley at quantel.com  Thu May 17 06:14:45 2007
From: Alec.Cawley at quantel.com (Alec.Cawley@quantel.com)
Date: Thu, 17 May 2007 13:14:45 +0100
Subject: [Rxtx] Source or javadox for javax.comm API
Message-ID: <OFCB4EC68D.D9F23803-ON802572DE.004266E0-802572DE.00434257@Research.Quantel>

I want to access serial ports on Windows from Java. I get think I 
understand how to compile and run - put RXTXcomm.jar in my classpath, put 
the appropriate DLLs in the DLL search path. But what about me? How do I 
lean how to use it? There is no javax.comm in the api Javadoc with the 
JAVA SDK 6.1, and I can only find on-line javadoc for it. I would prefer 
not to be dependant on on-line resources *all* the time. Is there 
somewhere I can download javax.comm.java or a bundle of the Javadocs 
generated from it?

Alec Cawley

-- 
This e-mail is intended for the named addressees only. Its contents may be 
privileged or confidential and should be treated as such. If you are not 
an intended recipient please notify the sender immediately and then delete 
it;  do not copy, distribute, or take any action based on this e-mail. In 
the pursuit of its legitimate business activities and its conformance with 
relevant legislation, Quantel may access any e-mail (including 
attachments) it originates or receives, for potential scrutiny. 

Quantel is the trade name used by Quantel Holdings Limited and its 
subsidiaries.  Quantel Holdings Limited is registered in England & Wales. 
Registration No: 4004913 
Contact details for all Quantel Offices and Companies can be found on our 
website www.quantel.com or by writing to the holding company.
Registered address: Turnpike Road, Newbury, Berkshire, RG14 2NX, United 
Kingdom 


From support at kartmanager.de  Mon May 14 08:43:08 2007
From: support at kartmanager.de (Andre Geisler)
Date: Mon, 14 May 2007 16:43:08 +0200
Subject: [Rxtx] Problem on closing Ports
Message-ID: <4648757C.8080601@kartmanager.de>

Hello,

i have got a small problem on closing serail ports.
The following class manages the my serials connection an
is handeled by an object calles kbn which lays in a java
swin gui:

public class Serial implements SerialPortEventListener{
   
    private static CommPortIdentifier portId;
    private static Enumeration          portList;
    private InputStream              inputStream;
    private OutputStream        outputStream;
    private SerialPort              serialPort;
    private AmbHandler ambh = new AmbHandler();
    private String              defaultPort = "/dev/ttyS0";
    private Kartbahnnutzung kbn;
   
    public Serial() {}
   
    public void connect(){
        boolean              portFound = false;
      
        portList = CommPortIdentifier.getPortIdentifiers();

        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                if (portId.getName().equals(defaultPort)) {
                    System.out.println("Found port: "+defaultPort);
                    portFound = true;
                }
            }
        }
        if (!portFound) {
            System.out.println("port " + defaultPort + " not found.");
        }
       
        try {
            serialPort = (SerialPort) portId.open("Kartman Read Thread", 
2000);
        } catch (PortInUseException e) {}

        try {
            inputStream = serialPort.getInputStream();
            outputStream = serialPort.getOutputStream();
        } catch (IOException e) {}

        try {
            serialPort.addEventListener(this);
        } catch (TooManyListenersException e) {}

        serialPort.notifyOnDataAvailable(true);

        try {
            serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,
                           SerialPort.STOPBITS_2,
                           SerialPort.PARITY_NONE);
        } catch (UnsupportedCommOperationException e){}
        
    }

    public void serialEvent(SerialPortEvent event) {
        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
            break;

        case SerialPortEvent.DATA_AVAILABLE:
            byte[] readBuffer =new byte[25];
           
       
           int numBytes=0;
            try {
               
            while (inputStream.available() > 0) {
                numBytes = inputStream.read(readBuffer);
                System.out.println("String: "+ new 
String(readBuffer,0,numBytes));
                System.out.println("Anzahl der bytes: "+numBytes);
                ambh.newMessage(new String(readBuffer,0,numBytes));
                readBuffer = new byte[25];
            }
            if(ambh.isPacketComplete()){
                System.out.println("Complete packet? 
"+ambh.isPacketComplete());
                kbn.addErgebnis(ambh.getLastPacket());
                System.out.println("Letzte 
Nachricht:"+ambh.getLastPacket().getMessage());
            }
            } catch (IOException e) {System.out.println("Ups!");}

            break;
        }
    }
   
    public void simpleWrite(char c){
       
        try{               
           
            this.outputStream.write(c);
                           
        }catch ( IOException e ){
            e.printStackTrace();
        }           
    }
   
    public void disconnect(){
        serialPort.removeEventListener();
        serialPort.close();
        System.out.println(defaultPort+" is closed!");
    }
   
    public ArrayList<AmbPacket> getAmbArray(){
        return ambh.getPacketarr();
    }
    public void setKartbahnnutzung(Kartbahnnutzung kbn){
        this.kbn=kbn;
    }

}

I have got a button called which closes the connection.
Everything is ok, it is calling an method from kbn which calls
serialcon.disconnect();

But there is also the possibility that the kbn object closes the 
connection it self.
It uses the same function "serial.disconnect()". The function itself is 
startetd,
but it does not close the connection. Nothing els happens, no exception, 
no ...
The program stops, and else happens.
Is there a better way to close this connection???

regards

-- 
Mit freundlichen Gr??en

Andr? Geisler
http://www.kartmanager.de
support at kartmanager.de



From rithy8 at gmail.com  Mon May 14 12:16:39 2007
From: rithy8 at gmail.com (rithy roth)
Date: Mon, 14 May 2007 11:16:39 -0700
Subject: [Rxtx] please help on when read time out occurs
Message-ID: <79e2547b0705141116q6138850sdb937a6fe74b5eb3@mail.gmail.com>

Hi,

I've been looking for some doc regarding what enableReceiveTimeout() is
doing( which event is generated) when a read time out occurs. Also, I am not
sure myself what to do in my code when a timeout happens. Could someone
please
help?

Thanks

========================================

Here is a portion of my code:

After opening my serial port, I issued the following:
...
     try {
        sPort.enableReceiveTimeout(30);
    } catch (UnsupportedCommOperationException e) {
         throw new SerialConnectionException("Enable Receive Timeout not
supported");
    }
...

Then, on my read I just have a listener on event notification:

   public void serialEvent(SerialPortEvent e) {

    // Create a StringBuffer and int to receive input data.
    StringBuffer inputBuffer = new StringBuffer();
    int         newData = 0;

    // Determine type of event.
    switch (e.getEventType()) {

    // Read data until -1 is returned. If \r is received substitute
    // \n for correct newline handling.
    case SerialPortEvent.DATA_AVAILABLE:
           // System.out.println("data available");
        while (newData != -1) {
        try {
           newData = is.read();

           if (newData == -1) {
            break;
            }


            inputBuffer.append((char) newData);

        } catch (IOException ex) {
         System.err.println(ex);

            return;
        }
      }

        break;

    // If break event append BREAK RECEIVED message.
    case SerialPortEvent.BI:
       // messageAreaIn.append("\n--- BREAK RECEIVED ---\n");
             Utils.debugprint("\n--- BREAK RECEIVED ---\n");
    }
    }
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From info at haberkamp.com  Tue May 15 04:27:10 2007
From: info at haberkamp.com (Guido Haberkamp IT-Beratung)
Date: Tue, 15 May 2007 12:27:10 +0200
Subject: [Rxtx] CommPortIdentifier "hangs"
Message-ID: <46498AFE.7050307@haberkamp.com>

Hello,

I couldn't find a solution to my problem or even anybody else mentioning
this problem on the net, so I'm asking you all for help.

I'm trying to use rxtx2.1.7 But when I try to get the portId from
CommPortIdentifier.getPortIdentifier("COM1")
It takes 3min50sec for the method to return the value.
After that everything works fine.

Connecting via Hyperterminal to the same port shows no noticable delay


I'll include my code at the end of this posting

Thanks for your help.
Guido


Here some details to my programming environment:

Windows 2000 Prof.
IBM T23 with one built-in Comport ("COM1"),
another one via USB-Serial Adapter (ATEN, COM5 or COM8)
COM10-17 are assigned because of a VS Netcom Device that connects 8
Serial ports over one tcp/ip link

Eclipse 3.2.2
Java 1.5.0
rxtx-2.1-7r2


I'm new to Java programming in general and serial port communication in
particular, so I'd really appreciate  also some hints if I use rxtx
completely the wrong way.

at Captain.at there's a code example that iterates through all available
ports (including parallel ports), but that code gave me many strange
exceptions,
so I changed it to opening the required port directly.


Here's my code:

import gnu.io.CommPort;

import gnu.io.CommPortIdentifier;

import gnu.io.NoSuchPortException;

import gnu.io.PortInUseException;

import gnu.io.SerialPort;

import gnu.io.SerialPortEvent;

import gnu.io.SerialPortEventListener;

import gnu.io.UnsupportedCommOperationException;



import java.io.BufferedReader;

import java.io.FileDescriptor;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.util.Date;

import java.util.Enumeration;

import java.util.TooManyListenersException;

import java.util.prefs.Preferences;

import logic.Parser;



/**

 * TODO Add comment here

 * @author  $Author:  $

 * @version  $Revision:  $, $Date:  $ UTC

 */

public class SerialCommunicator implements SerialPortEventListener

{

    static CommPortIdentifier portId = null;

    static Enumeration portList = null;

    String appName = null;

    private int baudRate = 0;

    private String device = null;

//    InputStream in = null;

    BufferedReader in = null;

    private String lineRead = null;

    OutputStream out = null;

    private Parser parser = null;

    private String portName = null;

    private Preferences prefs = null;

    public Thread readerThread = null;

    private SerialPort serialPort = null;

    int timeout = 0;

    public Thread writerThread = null;



    public SerialCommunicator(Parser p, Preferences pr, String dev)

    {



        super();

        this.parser = p;

        this.prefs = pr;

        this.device = dev;

//        TODO: assertions p, pr, d != null

        Preferences node = prefs.node("General");

        this.timeout = node.getInt("timeout", 0);

        node = prefs.node(device);

        this.portName = node.get("portName", null);

        this.baudRate = node.getInt("baudRate", 0);

        this.appName = node.get("appName", null);



        System.out.println("Trying to connect to port "+portName);

        Date date = new Date();

        System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        if (foundPort(portName)){

            try {

                connect();

            } catch (Exception e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

            date = new Date();

            System.out.println("Connected to port "+portName);

            System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        }

        else {

            System.out.println("Could not connect");

        }

    }



    boolean foundPort (String port){

        boolean portFound = false;

        try {

//            portId = CommPortIdentifier.getPortIdentifier(port);

            portId = CommPortIdentifier.getPortIdentifier("COM5");

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        if ( portId.isCurrentlyOwned() )

        {

            System.out.println("Error: Port is currently in use");

        }

        else {

            portFound = true;

        }

        return portFound;

    }

    void connect () throws Exception

    {

        this.openPort(portName);

        this.setInputStream();

        this.setParameters();

    }

    void openPort (String port){



        try {

            serialPort = (SerialPort) portId.open(appName, timeout);

        } catch (PortInUseException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }



    void setInputStream (){

        try {

            this.in = new BufferedReader(new
InputStreamReader(this.serialPort.getInputStream()));

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        serialPort.notifyOnDataAvailable(true);

        try {

            serialPort.addEventListener(this);

        } catch (TooManyListenersException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }



    }





    void setParameters(){

        try {

            this.serialPort.setSerialPortParams(baudRate,
SerialPort.DATABITS_8, SerialPort.STOPBITS_1,

                    SerialPort.PARITY_NONE);

        } catch (UnsupportedCommOperationException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }











    public void serialEvent(SerialPortEvent event) {

        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:

            break;

        case SerialPortEvent.DATA_AVAILABLE:

            try {

                this.lineRead = this.in.readLine();

                System.out.println("Read: "+lineRead);

            }

            catch (IOException e) {}



            break;

        }

    }





}


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From murato at mobiliz.com.tr  Wed May 16 06:58:50 2007
From: murato at mobiliz.com.tr (Murat Ozdemir)
Date: Wed, 16 May 2007 15:58:50 +0300
Subject: [Rxtx] java.io.IOException: No error in nativeDrain
Message-ID: <E3BF513AF070D741AE92D4780D6813A314A2EE@mobilizdc.mobiliz.com.tr>

Hello all,
i'm using RXTX 2.1 with JSmsLib 2.1.0
 
When i'm trying to run that framework, i'm getting exceptions from RXTX
Library as;
 
java.io.IOException: No error in nativeDrain
at gnu.io.RXTXPort.nativeDrain(Native Method)
at gnu.io.RXTXPort$SerialOutputStream.flush(RXTXPort.java:1201)
at org.smslib.CSerialDriver.send(CSerialDriver.java:206)
at org.smslib.handler.CATHandler.sync(CATHandler.java:43)
at org.smslib.CService.connect(CService.java:539)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.doIt(ReadMessagesAsync.java:92)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.main(ReadMessagesAsync.java:140)
 
 
Also, 
when i've read the README for rxtxSerial.dll faced that;
 
Wed Mar  1 12:01:05 MST 2006
rxtxSerial.dll had to be recomopiled to link in missing native methods.
 
what should i do? How can i recompile the dll?
 
---------------
Murat OZDEMiR
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From Alec.Cawley at quantel.com  Thu May 17 06:14:45 2007
From: Alec.Cawley at quantel.com (Alec.Cawley@quantel.com)
Date: Thu, 17 May 2007 13:14:45 +0100
Subject: [Rxtx] Source or javadox for javax.comm API
Message-ID: <OFCB4EC68D.D9F23803-ON802572DE.004266E0-802572DE.00434257@Research.Quantel>

I want to access serial ports on Windows from Java. I get think I 
understand how to compile and run - put RXTXcomm.jar in my classpath, put 
the appropriate DLLs in the DLL search path. But what about me? How do I 
lean how to use it? There is no javax.comm in the api Javadoc with the 
JAVA SDK 6.1, and I can only find on-line javadoc for it. I would prefer 
not to be dependant on on-line resources *all* the time. Is there 
somewhere I can download javax.comm.java or a bundle of the Javadocs 
generated from it?

Alec Cawley

-- 
This e-mail is intended for the named addressees only. Its contents may be 
privileged or confidential and should be treated as such. If you are not 
an intended recipient please notify the sender immediately and then delete 
it;  do not copy, distribute, or take any action based on this e-mail. In 
the pursuit of its legitimate business activities and its conformance with 
relevant legislation, Quantel may access any e-mail (including 
attachments) it originates or receives, for potential scrutiny. 

Quantel is the trade name used by Quantel Holdings Limited and its 
subsidiaries.  Quantel Holdings Limited is registered in England & Wales. 
Registration No: 4004913 
Contact details for all Quantel Offices and Companies can be found on our 
website www.quantel.com or by writing to the holding company.
Registered address: Turnpike Road, Newbury, Berkshire, RG14 2NX, United 
Kingdom 


From h.mayer at inode.at  Sat May 19 10:01:39 2007
From: h.mayer at inode.at (Hannes Mayer)
Date: Sat, 19 May 2007 18:01:39 +0200
Subject: [Rxtx] RXTX hangs (100% cpu) when using USB-to-Serial converter
Message-ID: <464F1F63.4020302@inode.at>

Hi all!

I was testing my new USB-to-Serial converter with the
SimpleRead.java application, but it hangs with 100%
cpu.

I also have an own app, which sends a string and
tries to receive it. I use a null-modem - while sending
works (I can see the string with "cat /dev/ttyUSB0"),
the serialEvent is not fired and 100% cpu is the result.

Doing the same (sending a string and receiving) with
some C code works.

Has anyone see the same behaviour and is there a fix
somewhere ?

Thanks!
Cheers,
Hannes.

From h.mayer at inode.at  Sat May 19 12:36:57 2007
From: h.mayer at inode.at (Hannes Mayer)
Date: Sat, 19 May 2007 20:36:57 +0200
Subject: [Rxtx] RXTX hangs (100% cpu) when using USB-to-Serial converter
In-Reply-To: <464F1F63.4020302@inode.at>
References: <464F1F63.4020302@inode.at>
Message-ID: <464F43C9.2000003@inode.at>

Hannes Mayer wrote:
> Hi all!
> 
> I was testing my new USB-to-Serial converter with the
> SimpleRead.java application, but it hangs with 100%
> cpu.

Found the problem!
Removing
serialPort.notifyOnOutputEmpty(true);
resolves this issue.
It seems that the usbserial driver doesn't support this.

Cheers,
Hannes.



From support at kartmanager.de  Mon May 14 08:43:08 2007
From: support at kartmanager.de (Andre Geisler)
Date: Mon, 14 May 2007 16:43:08 +0200
Subject: [Rxtx] Problem on closing Ports
Message-ID: <4648757C.8080601@kartmanager.de>

Hello,

i have got a small problem on closing serail ports.
The following class manages the my serials connection an
is handeled by an object calles kbn which lays in a java
swin gui:

public class Serial implements SerialPortEventListener{
   
    private static CommPortIdentifier portId;
    private static Enumeration          portList;
    private InputStream              inputStream;
    private OutputStream        outputStream;
    private SerialPort              serialPort;
    private AmbHandler ambh = new AmbHandler();
    private String              defaultPort = "/dev/ttyS0";
    private Kartbahnnutzung kbn;
   
    public Serial() {}
   
    public void connect(){
        boolean              portFound = false;
      
        portList = CommPortIdentifier.getPortIdentifiers();

        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                if (portId.getName().equals(defaultPort)) {
                    System.out.println("Found port: "+defaultPort);
                    portFound = true;
                }
            }
        }
        if (!portFound) {
            System.out.println("port " + defaultPort + " not found.");
        }
       
        try {
            serialPort = (SerialPort) portId.open("Kartman Read Thread", 
2000);
        } catch (PortInUseException e) {}

        try {
            inputStream = serialPort.getInputStream();
            outputStream = serialPort.getOutputStream();
        } catch (IOException e) {}

        try {
            serialPort.addEventListener(this);
        } catch (TooManyListenersException e) {}

        serialPort.notifyOnDataAvailable(true);

        try {
            serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,
                           SerialPort.STOPBITS_2,
                           SerialPort.PARITY_NONE);
        } catch (UnsupportedCommOperationException e){}
        
    }

    public void serialEvent(SerialPortEvent event) {
        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
            break;

        case SerialPortEvent.DATA_AVAILABLE:
            byte[] readBuffer =new byte[25];
           
       
           int numBytes=0;
            try {
               
            while (inputStream.available() > 0) {
                numBytes = inputStream.read(readBuffer);
                System.out.println("String: "+ new 
String(readBuffer,0,numBytes));
                System.out.println("Anzahl der bytes: "+numBytes);
                ambh.newMessage(new String(readBuffer,0,numBytes));
                readBuffer = new byte[25];
            }
            if(ambh.isPacketComplete()){
                System.out.println("Complete packet? 
"+ambh.isPacketComplete());
                kbn.addErgebnis(ambh.getLastPacket());
                System.out.println("Letzte 
Nachricht:"+ambh.getLastPacket().getMessage());
            }
            } catch (IOException e) {System.out.println("Ups!");}

            break;
        }
    }
   
    public void simpleWrite(char c){
       
        try{               
           
            this.outputStream.write(c);
                           
        }catch ( IOException e ){
            e.printStackTrace();
        }           
    }
   
    public void disconnect(){
        serialPort.removeEventListener();
        serialPort.close();
        System.out.println(defaultPort+" is closed!");
    }
   
    public ArrayList<AmbPacket> getAmbArray(){
        return ambh.getPacketarr();
    }
    public void setKartbahnnutzung(Kartbahnnutzung kbn){
        this.kbn=kbn;
    }

}

I have got a button called which closes the connection.
Everything is ok, it is calling an method from kbn which calls
serialcon.disconnect();

But there is also the possibility that the kbn object closes the 
connection it self.
It uses the same function "serial.disconnect()". The function itself is 
startetd,
but it does not close the connection. Nothing els happens, no exception, 
no ...
The program stops, and else happens.
Is there a better way to close this connection???

regards

-- 
Mit freundlichen Gr??en

Andr? Geisler
http://www.kartmanager.de
support at kartmanager.de



From rithy8 at gmail.com  Mon May 14 12:16:39 2007
From: rithy8 at gmail.com (rithy roth)
Date: Mon, 14 May 2007 11:16:39 -0700
Subject: [Rxtx] please help on when read time out occurs
Message-ID: <79e2547b0705141116q6138850sdb937a6fe74b5eb3@mail.gmail.com>

Hi,

I've been looking for some doc regarding what enableReceiveTimeout() is
doing( which event is generated) when a read time out occurs. Also, I am not
sure myself what to do in my code when a timeout happens. Could someone
please
help?

Thanks

========================================

Here is a portion of my code:

After opening my serial port, I issued the following:
...
     try {
        sPort.enableReceiveTimeout(30);
    } catch (UnsupportedCommOperationException e) {
         throw new SerialConnectionException("Enable Receive Timeout not
supported");
    }
...

Then, on my read I just have a listener on event notification:

   public void serialEvent(SerialPortEvent e) {

    // Create a StringBuffer and int to receive input data.
    StringBuffer inputBuffer = new StringBuffer();
    int         newData = 0;

    // Determine type of event.
    switch (e.getEventType()) {

    // Read data until -1 is returned. If \r is received substitute
    // \n for correct newline handling.
    case SerialPortEvent.DATA_AVAILABLE:
           // System.out.println("data available");
        while (newData != -1) {
        try {
           newData = is.read();

           if (newData == -1) {
            break;
            }


            inputBuffer.append((char) newData);

        } catch (IOException ex) {
         System.err.println(ex);

            return;
        }
      }

        break;

    // If break event append BREAK RECEIVED message.
    case SerialPortEvent.BI:
       // messageAreaIn.append("\n--- BREAK RECEIVED ---\n");
             Utils.debugprint("\n--- BREAK RECEIVED ---\n");
    }
    }
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From info at haberkamp.com  Tue May 15 04:27:10 2007
From: info at haberkamp.com (Guido Haberkamp IT-Beratung)
Date: Tue, 15 May 2007 12:27:10 +0200
Subject: [Rxtx] CommPortIdentifier "hangs"
Message-ID: <46498AFE.7050307@haberkamp.com>

Hello,

I couldn't find a solution to my problem or even anybody else mentioning
this problem on the net, so I'm asking you all for help.

I'm trying to use rxtx2.1.7 But when I try to get the portId from
CommPortIdentifier.getPortIdentifier("COM1")
It takes 3min50sec for the method to return the value.
After that everything works fine.

Connecting via Hyperterminal to the same port shows no noticable delay


I'll include my code at the end of this posting

Thanks for your help.
Guido


Here some details to my programming environment:

Windows 2000 Prof.
IBM T23 with one built-in Comport ("COM1"),
another one via USB-Serial Adapter (ATEN, COM5 or COM8)
COM10-17 are assigned because of a VS Netcom Device that connects 8
Serial ports over one tcp/ip link

Eclipse 3.2.2
Java 1.5.0
rxtx-2.1-7r2


I'm new to Java programming in general and serial port communication in
particular, so I'd really appreciate  also some hints if I use rxtx
completely the wrong way.

at Captain.at there's a code example that iterates through all available
ports (including parallel ports), but that code gave me many strange
exceptions,
so I changed it to opening the required port directly.


Here's my code:

import gnu.io.CommPort;

import gnu.io.CommPortIdentifier;

import gnu.io.NoSuchPortException;

import gnu.io.PortInUseException;

import gnu.io.SerialPort;

import gnu.io.SerialPortEvent;

import gnu.io.SerialPortEventListener;

import gnu.io.UnsupportedCommOperationException;



import java.io.BufferedReader;

import java.io.FileDescriptor;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.util.Date;

import java.util.Enumeration;

import java.util.TooManyListenersException;

import java.util.prefs.Preferences;

import logic.Parser;



/**

 * TODO Add comment here

 * @author  $Author:  $

 * @version  $Revision:  $, $Date:  $ UTC

 */

public class SerialCommunicator implements SerialPortEventListener

{

    static CommPortIdentifier portId = null;

    static Enumeration portList = null;

    String appName = null;

    private int baudRate = 0;

    private String device = null;

//    InputStream in = null;

    BufferedReader in = null;

    private String lineRead = null;

    OutputStream out = null;

    private Parser parser = null;

    private String portName = null;

    private Preferences prefs = null;

    public Thread readerThread = null;

    private SerialPort serialPort = null;

    int timeout = 0;

    public Thread writerThread = null;



    public SerialCommunicator(Parser p, Preferences pr, String dev)

    {



        super();

        this.parser = p;

        this.prefs = pr;

        this.device = dev;

//        TODO: assertions p, pr, d != null

        Preferences node = prefs.node("General");

        this.timeout = node.getInt("timeout", 0);

        node = prefs.node(device);

        this.portName = node.get("portName", null);

        this.baudRate = node.getInt("baudRate", 0);

        this.appName = node.get("appName", null);



        System.out.println("Trying to connect to port "+portName);

        Date date = new Date();

        System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        if (foundPort(portName)){

            try {

                connect();

            } catch (Exception e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

            date = new Date();

            System.out.println("Connected to port "+portName);

            System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        }

        else {

            System.out.println("Could not connect");

        }

    }



    boolean foundPort (String port){

        boolean portFound = false;

        try {

//            portId = CommPortIdentifier.getPortIdentifier(port);

            portId = CommPortIdentifier.getPortIdentifier("COM5");

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        if ( portId.isCurrentlyOwned() )

        {

            System.out.println("Error: Port is currently in use");

        }

        else {

            portFound = true;

        }

        return portFound;

    }

    void connect () throws Exception

    {

        this.openPort(portName);

        this.setInputStream();

        this.setParameters();

    }

    void openPort (String port){



        try {

            serialPort = (SerialPort) portId.open(appName, timeout);

        } catch (PortInUseException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }



    void setInputStream (){

        try {

            this.in = new BufferedReader(new
InputStreamReader(this.serialPort.getInputStream()));

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        serialPort.notifyOnDataAvailable(true);

        try {

            serialPort.addEventListener(this);

        } catch (TooManyListenersException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }



    }





    void setParameters(){

        try {

            this.serialPort.setSerialPortParams(baudRate,
SerialPort.DATABITS_8, SerialPort.STOPBITS_1,

                    SerialPort.PARITY_NONE);

        } catch (UnsupportedCommOperationException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }











    public void serialEvent(SerialPortEvent event) {

        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:

            break;

        case SerialPortEvent.DATA_AVAILABLE:

            try {

                this.lineRead = this.in.readLine();

                System.out.println("Read: "+lineRead);

            }

            catch (IOException e) {}



            break;

        }

    }





}


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From murato at mobiliz.com.tr  Wed May 16 06:58:50 2007
From: murato at mobiliz.com.tr (Murat Ozdemir)
Date: Wed, 16 May 2007 15:58:50 +0300
Subject: [Rxtx] java.io.IOException: No error in nativeDrain
Message-ID: <E3BF513AF070D741AE92D4780D6813A314A2EE@mobilizdc.mobiliz.com.tr>

Hello all,
i'm using RXTX 2.1 with JSmsLib 2.1.0
 
When i'm trying to run that framework, i'm getting exceptions from RXTX
Library as;
 
java.io.IOException: No error in nativeDrain
at gnu.io.RXTXPort.nativeDrain(Native Method)
at gnu.io.RXTXPort$SerialOutputStream.flush(RXTXPort.java:1201)
at org.smslib.CSerialDriver.send(CSerialDriver.java:206)
at org.smslib.handler.CATHandler.sync(CATHandler.java:43)
at org.smslib.CService.connect(CService.java:539)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.doIt(ReadMessagesAsync.java:92)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.main(ReadMessagesAsync.java:140)
 
 
Also, 
when i've read the README for rxtxSerial.dll faced that;
 
Wed Mar  1 12:01:05 MST 2006
rxtxSerial.dll had to be recomopiled to link in missing native methods.
 
what should i do? How can i recompile the dll?
 
---------------
Murat OZDEMiR
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From Alec.Cawley at quantel.com  Thu May 17 06:14:45 2007
From: Alec.Cawley at quantel.com (Alec.Cawley@quantel.com)
Date: Thu, 17 May 2007 13:14:45 +0100
Subject: [Rxtx] Source or javadox for javax.comm API
Message-ID: <OFCB4EC68D.D9F23803-ON802572DE.004266E0-802572DE.00434257@Research.Quantel>

I want to access serial ports on Windows from Java. I get think I 
understand how to compile and run - put RXTXcomm.jar in my classpath, put 
the appropriate DLLs in the DLL search path. But what about me? How do I 
lean how to use it? There is no javax.comm in the api Javadoc with the 
JAVA SDK 6.1, and I can only find on-line javadoc for it. I would prefer 
not to be dependant on on-line resources *all* the time. Is there 
somewhere I can download javax.comm.java or a bundle of the Javadocs 
generated from it?

Alec Cawley

-- 
This e-mail is intended for the named addressees only. Its contents may be 
privileged or confidential and should be treated as such. If you are not 
an intended recipient please notify the sender immediately and then delete 
it;  do not copy, distribute, or take any action based on this e-mail. In 
the pursuit of its legitimate business activities and its conformance with 
relevant legislation, Quantel may access any e-mail (including 
attachments) it originates or receives, for potential scrutiny. 

Quantel is the trade name used by Quantel Holdings Limited and its 
subsidiaries.  Quantel Holdings Limited is registered in England & Wales. 
Registration No: 4004913 
Contact details for all Quantel Offices and Companies can be found on our 
website www.quantel.com or by writing to the holding company.
Registered address: Turnpike Road, Newbury, Berkshire, RG14 2NX, United 
Kingdom 


From h.mayer at inode.at  Sat May 19 10:01:39 2007
From: h.mayer at inode.at (Hannes Mayer)
Date: Sat, 19 May 2007 18:01:39 +0200
Subject: [Rxtx] RXTX hangs (100% cpu) when using USB-to-Serial converter
Message-ID: <464F1F63.4020302@inode.at>

Hi all!

I was testing my new USB-to-Serial converter with the
SimpleRead.java application, but it hangs with 100%
cpu.

I also have an own app, which sends a string and
tries to receive it. I use a null-modem - while sending
works (I can see the string with "cat /dev/ttyUSB0"),
the serialEvent is not fired and 100% cpu is the result.

Doing the same (sending a string and receiving) with
some C code works.

Has anyone see the same behaviour and is there a fix
somewhere ?

Thanks!
Cheers,
Hannes.


From h.mayer at inode.at  Sat May 19 12:36:57 2007
From: h.mayer at inode.at (Hannes Mayer)
Date: Sat, 19 May 2007 20:36:57 +0200
Subject: [Rxtx] RXTX hangs (100% cpu) when using USB-to-Serial converter
In-Reply-To: <464F1F63.4020302@inode.at>
References: <464F1F63.4020302@inode.at>
Message-ID: <464F43C9.2000003@inode.at>

Hannes Mayer wrote:
> Hi all!
> 
> I was testing my new USB-to-Serial converter with the
> SimpleRead.java application, but it hangs with 100%
> cpu.

Found the problem!
Removing
serialPort.notifyOnOutputEmpty(true);
resolves this issue.
It seems that the usbserial driver doesn't support this.

Cheers,
Hannes.




From lists at iDIAcomputing.com  Sun May 20 17:59:11 2007
From: lists at iDIAcomputing.com (George Dinwiddie)
Date: Sun, 20 May 2007 19:59:11 -0400
Subject: [Rxtx] Underlying input stream returned zero bytes
Message-ID: <4650E0CF.8040900@iDIAcomputing.com>

Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
has no data available, I get
java.io.IOException: Underlying input stream returned zero bytes
	at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)

This is using code that worked fine with Sun's javax.comm API (the old
2.0 version) until a JVM upgrade broke it.

Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
have a C compiler on this box.  As near as I can tell from reading the
Java source, this means the open() call didn't grab a file descriptor.

  - George

-- 
  ----------------------------------------------------------------------
   * George Dinwiddie *                      http://blog.gdinwiddie.com
   Software Development                    http://www.idiacomputing.com
   Consultant and Coach                    http://www.agilemaryland.org
  ----------------------------------------------------------------------


From tjarvi at qbang.org  Sun May 20 18:08:39 2007
From: tjarvi at qbang.org (Trent Jarvi)
Date: Sun, 20 May 2007 18:08:39 -0600 (MDT)
Subject: [Rxtx] Underlying input stream returned zero bytes
In-Reply-To: <4650E0CF.8040900@iDIAcomputing.com>
References: <4650E0CF.8040900@iDIAcomputing.com>
Message-ID: <Pine.LNX.4.61.0705201807470.918@www>

On Sun, 20 May 2007, George Dinwiddie wrote:

> Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
> has no data available, I get
> java.io.IOException: Underlying input stream returned zero bytes
> 	at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)
>
> This is using code that worked fine with Sun's javax.comm API (the old
> 2.0 version) until a JVM upgrade broke it.
>
> Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
> have a C compiler on this box.  As near as I can tell from reading the
> Java source, this means the open() call didn't grab a file descriptor.
>
>  - George
>
>

Hi George,

Perhaps changing the threshold and or timeout may result in the behavior 
you expect.

--
Trent Jarvi
tjarvi at qbang.org

From lists at iDIAcomputing.com  Sun May 20 18:51:25 2007
From: lists at iDIAcomputing.com (George Dinwiddie)
Date: Sun, 20 May 2007 20:51:25 -0400
Subject: [Rxtx] Underlying input stream returned zero bytes
In-Reply-To: <Pine.LNX.4.61.0705201807470.918@www>
References: <4650E0CF.8040900@iDIAcomputing.com>
	<Pine.LNX.4.61.0705201807470.918@www>
Message-ID: <4650ED0D.9000204@iDIAcomputing.com>

Trent Jarvi wrote:
> On Sun, 20 May 2007, George Dinwiddie wrote:
> 
>> Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
>> has no data available, I get
>> java.io.IOException: Underlying input stream returned zero bytes
>>     at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)
>>
>> This is using code that worked fine with Sun's javax.comm API (the old
>> 2.0 version) until a JVM upgrade broke it.
>>
>> Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
>> have a C compiler on this box.  As near as I can tell from reading the
>> Java source, this means the open() call didn't grab a file descriptor.
>>
>>  - George
>>
>>
> 
> Hi George,
> 
> Perhaps changing the threshold and or timeout may result in the behavior 
> you expect.

Thanks, Trent.  Any suggestions on values?

BTW, The javax.comm 2.0 library seems to enable the timeout when opened as:

   CommPortIdentifier portId =
       CommPortIdentifier.getPortIdentifier(
		serialPortParams.getPortName());
   int timeout = 60000;
   serialPort = (SerialPort) portId.open(processname,
					timeout);

When I
       serialPort.enableReceiveTimeout(timeout);
       serialPort.enableReceiveThreshold(1);
I don't seem to receive any characters.

  - George

-- 
  ----------------------------------------------------------------------
   * George Dinwiddie *                      http://blog.gdinwiddie.com
   Software Development                    http://www.idiacomputing.com
   Consultant and Coach                    http://www.agilemaryland.org
  ----------------------------------------------------------------------


From support at kartmanager.de  Mon May 14 08:43:08 2007
From: support at kartmanager.de (Andre Geisler)
Date: Mon, 14 May 2007 16:43:08 +0200
Subject: [Rxtx] Problem on closing Ports
Message-ID: <4648757C.8080601@kartmanager.de>

Hello,

i have got a small problem on closing serail ports.
The following class manages the my serials connection an
is handeled by an object calles kbn which lays in a java
swin gui:

public class Serial implements SerialPortEventListener{
   
    private static CommPortIdentifier portId;
    private static Enumeration          portList;
    private InputStream              inputStream;
    private OutputStream        outputStream;
    private SerialPort              serialPort;
    private AmbHandler ambh = new AmbHandler();
    private String              defaultPort = "/dev/ttyS0";
    private Kartbahnnutzung kbn;
   
    public Serial() {}
   
    public void connect(){
        boolean              portFound = false;
      
        portList = CommPortIdentifier.getPortIdentifiers();

        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                if (portId.getName().equals(defaultPort)) {
                    System.out.println("Found port: "+defaultPort);
                    portFound = true;
                }
            }
        }
        if (!portFound) {
            System.out.println("port " + defaultPort + " not found.");
        }
       
        try {
            serialPort = (SerialPort) portId.open("Kartman Read Thread", 
2000);
        } catch (PortInUseException e) {}

        try {
            inputStream = serialPort.getInputStream();
            outputStream = serialPort.getOutputStream();
        } catch (IOException e) {}

        try {
            serialPort.addEventListener(this);
        } catch (TooManyListenersException e) {}

        serialPort.notifyOnDataAvailable(true);

        try {
            serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,
                           SerialPort.STOPBITS_2,
                           SerialPort.PARITY_NONE);
        } catch (UnsupportedCommOperationException e){}
        
    }

    public void serialEvent(SerialPortEvent event) {
        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
            break;

        case SerialPortEvent.DATA_AVAILABLE:
            byte[] readBuffer =new byte[25];
           
       
           int numBytes=0;
            try {
               
            while (inputStream.available() > 0) {
                numBytes = inputStream.read(readBuffer);
                System.out.println("String: "+ new 
String(readBuffer,0,numBytes));
                System.out.println("Anzahl der bytes: "+numBytes);
                ambh.newMessage(new String(readBuffer,0,numBytes));
                readBuffer = new byte[25];
            }
            if(ambh.isPacketComplete()){
                System.out.println("Complete packet? 
"+ambh.isPacketComplete());
                kbn.addErgebnis(ambh.getLastPacket());
                System.out.println("Letzte 
Nachricht:"+ambh.getLastPacket().getMessage());
            }
            } catch (IOException e) {System.out.println("Ups!");}

            break;
        }
    }
   
    public void simpleWrite(char c){
       
        try{               
           
            this.outputStream.write(c);
                           
        }catch ( IOException e ){
            e.printStackTrace();
        }           
    }
   
    public void disconnect(){
        serialPort.removeEventListener();
        serialPort.close();
        System.out.println(defaultPort+" is closed!");
    }
   
    public ArrayList<AmbPacket> getAmbArray(){
        return ambh.getPacketarr();
    }
    public void setKartbahnnutzung(Kartbahnnutzung kbn){
        this.kbn=kbn;
    }

}

I have got a button called which closes the connection.
Everything is ok, it is calling an method from kbn which calls
serialcon.disconnect();

But there is also the possibility that the kbn object closes the 
connection it self.
It uses the same function "serial.disconnect()". The function itself is 
startetd,
but it does not close the connection. Nothing els happens, no exception, 
no ...
The program stops, and else happens.
Is there a better way to close this connection???

regards

-- 
Mit freundlichen Gr??en

Andr? Geisler
http://www.kartmanager.de
support at kartmanager.de



From rithy8 at gmail.com  Mon May 14 12:16:39 2007
From: rithy8 at gmail.com (rithy roth)
Date: Mon, 14 May 2007 11:16:39 -0700
Subject: [Rxtx] please help on when read time out occurs
Message-ID: <79e2547b0705141116q6138850sdb937a6fe74b5eb3@mail.gmail.com>

Hi,

I've been looking for some doc regarding what enableReceiveTimeout() is
doing( which event is generated) when a read time out occurs. Also, I am not
sure myself what to do in my code when a timeout happens. Could someone
please
help?

Thanks

========================================

Here is a portion of my code:

After opening my serial port, I issued the following:
...
     try {
        sPort.enableReceiveTimeout(30);
    } catch (UnsupportedCommOperationException e) {
         throw new SerialConnectionException("Enable Receive Timeout not
supported");
    }
...

Then, on my read I just have a listener on event notification:

   public void serialEvent(SerialPortEvent e) {

    // Create a StringBuffer and int to receive input data.
    StringBuffer inputBuffer = new StringBuffer();
    int         newData = 0;

    // Determine type of event.
    switch (e.getEventType()) {

    // Read data until -1 is returned. If \r is received substitute
    // \n for correct newline handling.
    case SerialPortEvent.DATA_AVAILABLE:
           // System.out.println("data available");
        while (newData != -1) {
        try {
           newData = is.read();

           if (newData == -1) {
            break;
            }


            inputBuffer.append((char) newData);

        } catch (IOException ex) {
         System.err.println(ex);

            return;
        }
      }

        break;

    // If break event append BREAK RECEIVED message.
    case SerialPortEvent.BI:
       // messageAreaIn.append("\n--- BREAK RECEIVED ---\n");
             Utils.debugprint("\n--- BREAK RECEIVED ---\n");
    }
    }
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From info at haberkamp.com  Tue May 15 04:27:10 2007
From: info at haberkamp.com (Guido Haberkamp IT-Beratung)
Date: Tue, 15 May 2007 12:27:10 +0200
Subject: [Rxtx] CommPortIdentifier "hangs"
Message-ID: <46498AFE.7050307@haberkamp.com>

Hello,

I couldn't find a solution to my problem or even anybody else mentioning
this problem on the net, so I'm asking you all for help.

I'm trying to use rxtx2.1.7 But when I try to get the portId from
CommPortIdentifier.getPortIdentifier("COM1")
It takes 3min50sec for the method to return the value.
After that everything works fine.

Connecting via Hyperterminal to the same port shows no noticable delay


I'll include my code at the end of this posting

Thanks for your help.
Guido


Here some details to my programming environment:

Windows 2000 Prof.
IBM T23 with one built-in Comport ("COM1"),
another one via USB-Serial Adapter (ATEN, COM5 or COM8)
COM10-17 are assigned because of a VS Netcom Device that connects 8
Serial ports over one tcp/ip link

Eclipse 3.2.2
Java 1.5.0
rxtx-2.1-7r2


I'm new to Java programming in general and serial port communication in
particular, so I'd really appreciate  also some hints if I use rxtx
completely the wrong way.

at Captain.at there's a code example that iterates through all available
ports (including parallel ports), but that code gave me many strange
exceptions,
so I changed it to opening the required port directly.


Here's my code:

import gnu.io.CommPort;

import gnu.io.CommPortIdentifier;

import gnu.io.NoSuchPortException;

import gnu.io.PortInUseException;

import gnu.io.SerialPort;

import gnu.io.SerialPortEvent;

import gnu.io.SerialPortEventListener;

import gnu.io.UnsupportedCommOperationException;



import java.io.BufferedReader;

import java.io.FileDescriptor;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.util.Date;

import java.util.Enumeration;

import java.util.TooManyListenersException;

import java.util.prefs.Preferences;

import logic.Parser;



/**

 * TODO Add comment here

 * @author  $Author:  $

 * @version  $Revision:  $, $Date:  $ UTC

 */

public class SerialCommunicator implements SerialPortEventListener

{

    static CommPortIdentifier portId = null;

    static Enumeration portList = null;

    String appName = null;

    private int baudRate = 0;

    private String device = null;

//    InputStream in = null;

    BufferedReader in = null;

    private String lineRead = null;

    OutputStream out = null;

    private Parser parser = null;

    private String portName = null;

    private Preferences prefs = null;

    public Thread readerThread = null;

    private SerialPort serialPort = null;

    int timeout = 0;

    public Thread writerThread = null;



    public SerialCommunicator(Parser p, Preferences pr, String dev)

    {



        super();

        this.parser = p;

        this.prefs = pr;

        this.device = dev;

//        TODO: assertions p, pr, d != null

        Preferences node = prefs.node("General");

        this.timeout = node.getInt("timeout", 0);

        node = prefs.node(device);

        this.portName = node.get("portName", null);

        this.baudRate = node.getInt("baudRate", 0);

        this.appName = node.get("appName", null);



        System.out.println("Trying to connect to port "+portName);

        Date date = new Date();

        System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        if (foundPort(portName)){

            try {

                connect();

            } catch (Exception e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

            date = new Date();

            System.out.println("Connected to port "+portName);

            System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        }

        else {

            System.out.println("Could not connect");

        }

    }



    boolean foundPort (String port){

        boolean portFound = false;

        try {

//            portId = CommPortIdentifier.getPortIdentifier(port);

            portId = CommPortIdentifier.getPortIdentifier("COM5");

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        if ( portId.isCurrentlyOwned() )

        {

            System.out.println("Error: Port is currently in use");

        }

        else {

            portFound = true;

        }

        return portFound;

    }

    void connect () throws Exception

    {

        this.openPort(portName);

        this.setInputStream();

        this.setParameters();

    }

    void openPort (String port){



        try {

            serialPort = (SerialPort) portId.open(appName, timeout);

        } catch (PortInUseException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }



    void setInputStream (){

        try {

            this.in = new BufferedReader(new
InputStreamReader(this.serialPort.getInputStream()));

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        serialPort.notifyOnDataAvailable(true);

        try {

            serialPort.addEventListener(this);

        } catch (TooManyListenersException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }



    }





    void setParameters(){

        try {

            this.serialPort.setSerialPortParams(baudRate,
SerialPort.DATABITS_8, SerialPort.STOPBITS_1,

                    SerialPort.PARITY_NONE);

        } catch (UnsupportedCommOperationException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }











    public void serialEvent(SerialPortEvent event) {

        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:

            break;

        case SerialPortEvent.DATA_AVAILABLE:

            try {

                this.lineRead = this.in.readLine();

                System.out.println("Read: "+lineRead);

            }

            catch (IOException e) {}



            break;

        }

    }





}


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From murato at mobiliz.com.tr  Wed May 16 06:58:50 2007
From: murato at mobiliz.com.tr (Murat Ozdemir)
Date: Wed, 16 May 2007 15:58:50 +0300
Subject: [Rxtx] java.io.IOException: No error in nativeDrain
Message-ID: <E3BF513AF070D741AE92D4780D6813A314A2EE@mobilizdc.mobiliz.com.tr>

Hello all,
i'm using RXTX 2.1 with JSmsLib 2.1.0
 
When i'm trying to run that framework, i'm getting exceptions from RXTX
Library as;
 
java.io.IOException: No error in nativeDrain
at gnu.io.RXTXPort.nativeDrain(Native Method)
at gnu.io.RXTXPort$SerialOutputStream.flush(RXTXPort.java:1201)
at org.smslib.CSerialDriver.send(CSerialDriver.java:206)
at org.smslib.handler.CATHandler.sync(CATHandler.java:43)
at org.smslib.CService.connect(CService.java:539)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.doIt(ReadMessagesAsync.java:92)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.main(ReadMessagesAsync.java:140)
 
 
Also, 
when i've read the README for rxtxSerial.dll faced that;
 
Wed Mar  1 12:01:05 MST 2006
rxtxSerial.dll had to be recomopiled to link in missing native methods.
 
what should i do? How can i recompile the dll?
 
---------------
Murat OZDEMiR
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From Alec.Cawley at quantel.com  Thu May 17 06:14:45 2007
From: Alec.Cawley at quantel.com (Alec.Cawley@quantel.com)
Date: Thu, 17 May 2007 13:14:45 +0100
Subject: [Rxtx] Source or javadox for javax.comm API
Message-ID: <OFCB4EC68D.D9F23803-ON802572DE.004266E0-802572DE.00434257@Research.Quantel>

I want to access serial ports on Windows from Java. I get think I 
understand how to compile and run - put RXTXcomm.jar in my classpath, put 
the appropriate DLLs in the DLL search path. But what about me? How do I 
lean how to use it? There is no javax.comm in the api Javadoc with the 
JAVA SDK 6.1, and I can only find on-line javadoc for it. I would prefer 
not to be dependant on on-line resources *all* the time. Is there 
somewhere I can download javax.comm.java or a bundle of the Javadocs 
generated from it?

Alec Cawley

-- 
This e-mail is intended for the named addressees only. Its contents may be 
privileged or confidential and should be treated as such. If you are not 
an intended recipient please notify the sender immediately and then delete 
it;  do not copy, distribute, or take any action based on this e-mail. In 
the pursuit of its legitimate business activities and its conformance with 
relevant legislation, Quantel may access any e-mail (including 
attachments) it originates or receives, for potential scrutiny. 

Quantel is the trade name used by Quantel Holdings Limited and its 
subsidiaries.  Quantel Holdings Limited is registered in England & Wales. 
Registration No: 4004913 
Contact details for all Quantel Offices and Companies can be found on our 
website www.quantel.com or by writing to the holding company.
Registered address: Turnpike Road, Newbury, Berkshire, RG14 2NX, United 
Kingdom 


From h.mayer at inode.at  Sat May 19 10:01:39 2007
From: h.mayer at inode.at (Hannes Mayer)
Date: Sat, 19 May 2007 18:01:39 +0200
Subject: [Rxtx] RXTX hangs (100% cpu) when using USB-to-Serial converter
Message-ID: <464F1F63.4020302@inode.at>

Hi all!

I was testing my new USB-to-Serial converter with the
SimpleRead.java application, but it hangs with 100%
cpu.

I also have an own app, which sends a string and
tries to receive it. I use a null-modem - while sending
works (I can see the string with "cat /dev/ttyUSB0"),
the serialEvent is not fired and 100% cpu is the result.

Doing the same (sending a string and receiving) with
some C code works.

Has anyone see the same behaviour and is there a fix
somewhere ?

Thanks!
Cheers,
Hannes.


From h.mayer at inode.at  Sat May 19 12:36:57 2007
From: h.mayer at inode.at (Hannes Mayer)
Date: Sat, 19 May 2007 20:36:57 +0200
Subject: [Rxtx] RXTX hangs (100% cpu) when using USB-to-Serial converter
In-Reply-To: <464F1F63.4020302@inode.at>
References: <464F1F63.4020302@inode.at>
Message-ID: <464F43C9.2000003@inode.at>

Hannes Mayer wrote:
> Hi all!
> 
> I was testing my new USB-to-Serial converter with the
> SimpleRead.java application, but it hangs with 100%
> cpu.

Found the problem!
Removing
serialPort.notifyOnOutputEmpty(true);
resolves this issue.
It seems that the usbserial driver doesn't support this.

Cheers,
Hannes.




From lists at iDIAcomputing.com  Sun May 20 17:59:11 2007
From: lists at iDIAcomputing.com (George Dinwiddie)
Date: Sun, 20 May 2007 19:59:11 -0400
Subject: [Rxtx] Underlying input stream returned zero bytes
Message-ID: <4650E0CF.8040900@iDIAcomputing.com>

Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
has no data available, I get
java.io.IOException: Underlying input stream returned zero bytes
	at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)

This is using code that worked fine with Sun's javax.comm API (the old
2.0 version) until a JVM upgrade broke it.

Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
have a C compiler on this box.  As near as I can tell from reading the
Java source, this means the open() call didn't grab a file descriptor.

  - George

-- 
  ----------------------------------------------------------------------
   * George Dinwiddie *                      http://blog.gdinwiddie.com
   Software Development                    http://www.idiacomputing.com
   Consultant and Coach                    http://www.agilemaryland.org
  ----------------------------------------------------------------------



From tjarvi at qbang.org  Sun May 20 18:08:39 2007
From: tjarvi at qbang.org (Trent Jarvi)
Date: Sun, 20 May 2007 18:08:39 -0600 (MDT)
Subject: [Rxtx] Underlying input stream returned zero bytes
In-Reply-To: <4650E0CF.8040900@iDIAcomputing.com>
References: <4650E0CF.8040900@iDIAcomputing.com>
Message-ID: <Pine.LNX.4.61.0705201807470.918@www>

On Sun, 20 May 2007, George Dinwiddie wrote:

> Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
> has no data available, I get
> java.io.IOException: Underlying input stream returned zero bytes
> 	at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)
>
> This is using code that worked fine with Sun's javax.comm API (the old
> 2.0 version) until a JVM upgrade broke it.
>
> Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
> have a C compiler on this box.  As near as I can tell from reading the
> Java source, this means the open() call didn't grab a file descriptor.
>
>  - George
>
>

Hi George,

Perhaps changing the threshold and or timeout may result in the behavior 
you expect.

--
Trent Jarvi
tjarvi at qbang.org


From lists at iDIAcomputing.com  Sun May 20 18:51:25 2007
From: lists at iDIAcomputing.com (George Dinwiddie)
Date: Sun, 20 May 2007 20:51:25 -0400
Subject: [Rxtx] Underlying input stream returned zero bytes
In-Reply-To: <Pine.LNX.4.61.0705201807470.918@www>
References: <4650E0CF.8040900@iDIAcomputing.com>
	<Pine.LNX.4.61.0705201807470.918@www>
Message-ID: <4650ED0D.9000204@iDIAcomputing.com>

Trent Jarvi wrote:
> On Sun, 20 May 2007, George Dinwiddie wrote:
> 
>> Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
>> has no data available, I get
>> java.io.IOException: Underlying input stream returned zero bytes
>>     at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)
>>
>> This is using code that worked fine with Sun's javax.comm API (the old
>> 2.0 version) until a JVM upgrade broke it.
>>
>> Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
>> have a C compiler on this box.  As near as I can tell from reading the
>> Java source, this means the open() call didn't grab a file descriptor.
>>
>>  - George
>>
>>
> 
> Hi George,
> 
> Perhaps changing the threshold and or timeout may result in the behavior 
> you expect.

Thanks, Trent.  Any suggestions on values?

BTW, The javax.comm 2.0 library seems to enable the timeout when opened as:

   CommPortIdentifier portId =
       CommPortIdentifier.getPortIdentifier(
		serialPortParams.getPortName());
   int timeout = 60000;
   serialPort = (SerialPort) portId.open(processname,
					timeout);

When I
       serialPort.enableReceiveTimeout(timeout);
       serialPort.enableReceiveThreshold(1);
I don't seem to receive any characters.

  - George

-- 
  ----------------------------------------------------------------------
   * George Dinwiddie *                      http://blog.gdinwiddie.com
   Software Development                    http://www.idiacomputing.com
   Consultant and Coach                    http://www.agilemaryland.org
  ----------------------------------------------------------------------



From support at kartmanager.de  Mon May 14 08:43:08 2007
From: support at kartmanager.de (Andre Geisler)
Date: Mon, 14 May 2007 16:43:08 +0200
Subject: [Rxtx] Problem on closing Ports
Message-ID: <4648757C.8080601@kartmanager.de>

Hello,

i have got a small problem on closing serail ports.
The following class manages the my serials connection an
is handeled by an object calles kbn which lays in a java
swin gui:

public class Serial implements SerialPortEventListener{
   
    private static CommPortIdentifier portId;
    private static Enumeration          portList;
    private InputStream              inputStream;
    private OutputStream        outputStream;
    private SerialPort              serialPort;
    private AmbHandler ambh = new AmbHandler();
    private String              defaultPort = "/dev/ttyS0";
    private Kartbahnnutzung kbn;
   
    public Serial() {}
   
    public void connect(){
        boolean              portFound = false;
      
        portList = CommPortIdentifier.getPortIdentifiers();

        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                if (portId.getName().equals(defaultPort)) {
                    System.out.println("Found port: "+defaultPort);
                    portFound = true;
                }
            }
        }
        if (!portFound) {
            System.out.println("port " + defaultPort + " not found.");
        }
       
        try {
            serialPort = (SerialPort) portId.open("Kartman Read Thread", 
2000);
        } catch (PortInUseException e) {}

        try {
            inputStream = serialPort.getInputStream();
            outputStream = serialPort.getOutputStream();
        } catch (IOException e) {}

        try {
            serialPort.addEventListener(this);
        } catch (TooManyListenersException e) {}

        serialPort.notifyOnDataAvailable(true);

        try {
            serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,
                           SerialPort.STOPBITS_2,
                           SerialPort.PARITY_NONE);
        } catch (UnsupportedCommOperationException e){}
        
    }

    public void serialEvent(SerialPortEvent event) {
        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
            break;

        case SerialPortEvent.DATA_AVAILABLE:
            byte[] readBuffer =new byte[25];
           
       
           int numBytes=0;
            try {
               
            while (inputStream.available() > 0) {
                numBytes = inputStream.read(readBuffer);
                System.out.println("String: "+ new 
String(readBuffer,0,numBytes));
                System.out.println("Anzahl der bytes: "+numBytes);
                ambh.newMessage(new String(readBuffer,0,numBytes));
                readBuffer = new byte[25];
            }
            if(ambh.isPacketComplete()){
                System.out.println("Complete packet? 
"+ambh.isPacketComplete());
                kbn.addErgebnis(ambh.getLastPacket());
                System.out.println("Letzte 
Nachricht:"+ambh.getLastPacket().getMessage());
            }
            } catch (IOException e) {System.out.println("Ups!");}

            break;
        }
    }
   
    public void simpleWrite(char c){
       
        try{               
           
            this.outputStream.write(c);
                           
        }catch ( IOException e ){
            e.printStackTrace();
        }           
    }
   
    public void disconnect(){
        serialPort.removeEventListener();
        serialPort.close();
        System.out.println(defaultPort+" is closed!");
    }
   
    public ArrayList<AmbPacket> getAmbArray(){
        return ambh.getPacketarr();
    }
    public void setKartbahnnutzung(Kartbahnnutzung kbn){
        this.kbn=kbn;
    }

}

I have got a button called which closes the connection.
Everything is ok, it is calling an method from kbn which calls
serialcon.disconnect();

But there is also the possibility that the kbn object closes the 
connection it self.
It uses the same function "serial.disconnect()". The function itself is 
startetd,
but it does not close the connection. Nothing els happens, no exception, 
no ...
The program stops, and else happens.
Is there a better way to close this connection???

regards

-- 
Mit freundlichen Gr??en

Andr? Geisler
http://www.kartmanager.de
support at kartmanager.de



From rithy8 at gmail.com  Mon May 14 12:16:39 2007
From: rithy8 at gmail.com (rithy roth)
Date: Mon, 14 May 2007 11:16:39 -0700
Subject: [Rxtx] please help on when read time out occurs
Message-ID: <79e2547b0705141116q6138850sdb937a6fe74b5eb3@mail.gmail.com>

Hi,

I've been looking for some doc regarding what enableReceiveTimeout() is
doing( which event is generated) when a read time out occurs. Also, I am not
sure myself what to do in my code when a timeout happens. Could someone
please
help?

Thanks

========================================

Here is a portion of my code:

After opening my serial port, I issued the following:
...
     try {
        sPort.enableReceiveTimeout(30);
    } catch (UnsupportedCommOperationException e) {
         throw new SerialConnectionException("Enable Receive Timeout not
supported");
    }
...

Then, on my read I just have a listener on event notification:

   public void serialEvent(SerialPortEvent e) {

    // Create a StringBuffer and int to receive input data.
    StringBuffer inputBuffer = new StringBuffer();
    int         newData = 0;

    // Determine type of event.
    switch (e.getEventType()) {

    // Read data until -1 is returned. If \r is received substitute
    // \n for correct newline handling.
    case SerialPortEvent.DATA_AVAILABLE:
           // System.out.println("data available");
        while (newData != -1) {
        try {
           newData = is.read();

           if (newData == -1) {
            break;
            }


            inputBuffer.append((char) newData);

        } catch (IOException ex) {
         System.err.println(ex);

            return;
        }
      }

        break;

    // If break event append BREAK RECEIVED message.
    case SerialPortEvent.BI:
       // messageAreaIn.append("\n--- BREAK RECEIVED ---\n");
             Utils.debugprint("\n--- BREAK RECEIVED ---\n");
    }
    }
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From info at haberkamp.com  Tue May 15 04:27:10 2007
From: info at haberkamp.com (Guido Haberkamp IT-Beratung)
Date: Tue, 15 May 2007 12:27:10 +0200
Subject: [Rxtx] CommPortIdentifier "hangs"
Message-ID: <46498AFE.7050307@haberkamp.com>

Hello,

I couldn't find a solution to my problem or even anybody else mentioning
this problem on the net, so I'm asking you all for help.

I'm trying to use rxtx2.1.7 But when I try to get the portId from
CommPortIdentifier.getPortIdentifier("COM1")
It takes 3min50sec for the method to return the value.
After that everything works fine.

Connecting via Hyperterminal to the same port shows no noticable delay


I'll include my code at the end of this posting

Thanks for your help.
Guido


Here some details to my programming environment:

Windows 2000 Prof.
IBM T23 with one built-in Comport ("COM1"),
another one via USB-Serial Adapter (ATEN, COM5 or COM8)
COM10-17 are assigned because of a VS Netcom Device that connects 8
Serial ports over one tcp/ip link

Eclipse 3.2.2
Java 1.5.0
rxtx-2.1-7r2


I'm new to Java programming in general and serial port communication in
particular, so I'd really appreciate  also some hints if I use rxtx
completely the wrong way.

at Captain.at there's a code example that iterates through all available
ports (including parallel ports), but that code gave me many strange
exceptions,
so I changed it to opening the required port directly.


Here's my code:

import gnu.io.CommPort;

import gnu.io.CommPortIdentifier;

import gnu.io.NoSuchPortException;

import gnu.io.PortInUseException;

import gnu.io.SerialPort;

import gnu.io.SerialPortEvent;

import gnu.io.SerialPortEventListener;

import gnu.io.UnsupportedCommOperationException;



import java.io.BufferedReader;

import java.io.FileDescriptor;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.util.Date;

import java.util.Enumeration;

import java.util.TooManyListenersException;

import java.util.prefs.Preferences;

import logic.Parser;



/**

 * TODO Add comment here

 * @author  $Author:  $

 * @version  $Revision:  $, $Date:  $ UTC

 */

public class SerialCommunicator implements SerialPortEventListener

{

    static CommPortIdentifier portId = null;

    static Enumeration portList = null;

    String appName = null;

    private int baudRate = 0;

    private String device = null;

//    InputStream in = null;

    BufferedReader in = null;

    private String lineRead = null;

    OutputStream out = null;

    private Parser parser = null;

    private String portName = null;

    private Preferences prefs = null;

    public Thread readerThread = null;

    private SerialPort serialPort = null;

    int timeout = 0;

    public Thread writerThread = null;



    public SerialCommunicator(Parser p, Preferences pr, String dev)

    {



        super();

        this.parser = p;

        this.prefs = pr;

        this.device = dev;

//        TODO: assertions p, pr, d != null

        Preferences node = prefs.node("General");

        this.timeout = node.getInt("timeout", 0);

        node = prefs.node(device);

        this.portName = node.get("portName", null);

        this.baudRate = node.getInt("baudRate", 0);

        this.appName = node.get("appName", null);



        System.out.println("Trying to connect to port "+portName);

        Date date = new Date();

        System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        if (foundPort(portName)){

            try {

                connect();

            } catch (Exception e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

            date = new Date();

            System.out.println("Connected to port "+portName);

            System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        }

        else {

            System.out.println("Could not connect");

        }

    }



    boolean foundPort (String port){

        boolean portFound = false;

        try {

//            portId = CommPortIdentifier.getPortIdentifier(port);

            portId = CommPortIdentifier.getPortIdentifier("COM5");

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        if ( portId.isCurrentlyOwned() )

        {

            System.out.println("Error: Port is currently in use");

        }

        else {

            portFound = true;

        }

        return portFound;

    }

    void connect () throws Exception

    {

        this.openPort(portName);

        this.setInputStream();

        this.setParameters();

    }

    void openPort (String port){



        try {

            serialPort = (SerialPort) portId.open(appName, timeout);

        } catch (PortInUseException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }



    void setInputStream (){

        try {

            this.in = new BufferedReader(new
InputStreamReader(this.serialPort.getInputStream()));

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        serialPort.notifyOnDataAvailable(true);

        try {

            serialPort.addEventListener(this);

        } catch (TooManyListenersException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }



    }





    void setParameters(){

        try {

            this.serialPort.setSerialPortParams(baudRate,
SerialPort.DATABITS_8, SerialPort.STOPBITS_1,

                    SerialPort.PARITY_NONE);

        } catch (UnsupportedCommOperationException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }











    public void serialEvent(SerialPortEvent event) {

        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:

            break;

        case SerialPortEvent.DATA_AVAILABLE:

            try {

                this.lineRead = this.in.readLine();

                System.out.println("Read: "+lineRead);

            }

            catch (IOException e) {}



            break;

        }

    }





}


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From murato at mobiliz.com.tr  Wed May 16 06:58:50 2007
From: murato at mobiliz.com.tr (Murat Ozdemir)
Date: Wed, 16 May 2007 15:58:50 +0300
Subject: [Rxtx] java.io.IOException: No error in nativeDrain
Message-ID: <E3BF513AF070D741AE92D4780D6813A314A2EE@mobilizdc.mobiliz.com.tr>

Hello all,
i'm using RXTX 2.1 with JSmsLib 2.1.0
 
When i'm trying to run that framework, i'm getting exceptions from RXTX
Library as;
 
java.io.IOException: No error in nativeDrain
at gnu.io.RXTXPort.nativeDrain(Native Method)
at gnu.io.RXTXPort$SerialOutputStream.flush(RXTXPort.java:1201)
at org.smslib.CSerialDriver.send(CSerialDriver.java:206)
at org.smslib.handler.CATHandler.sync(CATHandler.java:43)
at org.smslib.CService.connect(CService.java:539)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.doIt(ReadMessagesAsync.java:92)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.main(ReadMessagesAsync.java:140)
 
 
Also, 
when i've read the README for rxtxSerial.dll faced that;
 
Wed Mar  1 12:01:05 MST 2006
rxtxSerial.dll had to be recomopiled to link in missing native methods.
 
what should i do? How can i recompile the dll?
 
---------------
Murat OZDEMiR
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From Alec.Cawley at quantel.com  Thu May 17 06:14:45 2007
From: Alec.Cawley at quantel.com (Alec.Cawley@quantel.com)
Date: Thu, 17 May 2007 13:14:45 +0100
Subject: [Rxtx] Source or javadox for javax.comm API
Message-ID: <OFCB4EC68D.D9F23803-ON802572DE.004266E0-802572DE.00434257@Research.Quantel>

I want to access serial ports on Windows from Java. I get think I 
understand how to compile and run - put RXTXcomm.jar in my classpath, put 
the appropriate DLLs in the DLL search path. But what about me? How do I 
lean how to use it? There is no javax.comm in the api Javadoc with the 
JAVA SDK 6.1, and I can only find on-line javadoc for it. I would prefer 
not to be dependant on on-line resources *all* the time. Is there 
somewhere I can download javax.comm.java or a bundle of the Javadocs 
generated from it?

Alec Cawley

-- 
This e-mail is intended for the named addressees only. Its contents may be 
privileged or confidential and should be treated as such. If you are not 
an intended recipient please notify the sender immediately and then delete 
it;  do not copy, distribute, or take any action based on this e-mail. In 
the pursuit of its legitimate business activities and its conformance with 
relevant legislation, Quantel may access any e-mail (including 
attachments) it originates or receives, for potential scrutiny. 

Quantel is the trade name used by Quantel Holdings Limited and its 
subsidiaries.  Quantel Holdings Limited is registered in England & Wales. 
Registration No: 4004913 
Contact details for all Quantel Offices and Companies can be found on our 
website www.quantel.com or by writing to the holding company.
Registered address: Turnpike Road, Newbury, Berkshire, RG14 2NX, United 
Kingdom 


From h.mayer at inode.at  Sat May 19 10:01:39 2007
From: h.mayer at inode.at (Hannes Mayer)
Date: Sat, 19 May 2007 18:01:39 +0200
Subject: [Rxtx] RXTX hangs (100% cpu) when using USB-to-Serial converter
Message-ID: <464F1F63.4020302@inode.at>

Hi all!

I was testing my new USB-to-Serial converter with the
SimpleRead.java application, but it hangs with 100%
cpu.

I also have an own app, which sends a string and
tries to receive it. I use a null-modem - while sending
works (I can see the string with "cat /dev/ttyUSB0"),
the serialEvent is not fired and 100% cpu is the result.

Doing the same (sending a string and receiving) with
some C code works.

Has anyone see the same behaviour and is there a fix
somewhere ?

Thanks!
Cheers,
Hannes.


From h.mayer at inode.at  Sat May 19 12:36:57 2007
From: h.mayer at inode.at (Hannes Mayer)
Date: Sat, 19 May 2007 20:36:57 +0200
Subject: [Rxtx] RXTX hangs (100% cpu) when using USB-to-Serial converter
In-Reply-To: <464F1F63.4020302@inode.at>
References: <464F1F63.4020302@inode.at>
Message-ID: <464F43C9.2000003@inode.at>

Hannes Mayer wrote:
> Hi all!
> 
> I was testing my new USB-to-Serial converter with the
> SimpleRead.java application, but it hangs with 100%
> cpu.

Found the problem!
Removing
serialPort.notifyOnOutputEmpty(true);
resolves this issue.
It seems that the usbserial driver doesn't support this.

Cheers,
Hannes.




From lists at iDIAcomputing.com  Sun May 20 17:59:11 2007
From: lists at iDIAcomputing.com (George Dinwiddie)
Date: Sun, 20 May 2007 19:59:11 -0400
Subject: [Rxtx] Underlying input stream returned zero bytes
Message-ID: <4650E0CF.8040900@iDIAcomputing.com>

Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
has no data available, I get
java.io.IOException: Underlying input stream returned zero bytes
	at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)

This is using code that worked fine with Sun's javax.comm API (the old
2.0 version) until a JVM upgrade broke it.

Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
have a C compiler on this box.  As near as I can tell from reading the
Java source, this means the open() call didn't grab a file descriptor.

  - George

-- 
  ----------------------------------------------------------------------
   * George Dinwiddie *                      http://blog.gdinwiddie.com
   Software Development                    http://www.idiacomputing.com
   Consultant and Coach                    http://www.agilemaryland.org
  ----------------------------------------------------------------------



From tjarvi at qbang.org  Sun May 20 18:08:39 2007
From: tjarvi at qbang.org (Trent Jarvi)
Date: Sun, 20 May 2007 18:08:39 -0600 (MDT)
Subject: [Rxtx] Underlying input stream returned zero bytes
In-Reply-To: <4650E0CF.8040900@iDIAcomputing.com>
References: <4650E0CF.8040900@iDIAcomputing.com>
Message-ID: <Pine.LNX.4.61.0705201807470.918@www>

On Sun, 20 May 2007, George Dinwiddie wrote:

> Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
> has no data available, I get
> java.io.IOException: Underlying input stream returned zero bytes
> 	at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)
>
> This is using code that worked fine with Sun's javax.comm API (the old
> 2.0 version) until a JVM upgrade broke it.
>
> Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
> have a C compiler on this box.  As near as I can tell from reading the
> Java source, this means the open() call didn't grab a file descriptor.
>
>  - George
>
>

Hi George,

Perhaps changing the threshold and or timeout may result in the behavior 
you expect.

--
Trent Jarvi
tjarvi at qbang.org


From lists at iDIAcomputing.com  Sun May 20 18:51:25 2007
From: lists at iDIAcomputing.com (George Dinwiddie)
Date: Sun, 20 May 2007 20:51:25 -0400
Subject: [Rxtx] Underlying input stream returned zero bytes
In-Reply-To: <Pine.LNX.4.61.0705201807470.918@www>
References: <4650E0CF.8040900@iDIAcomputing.com>
	<Pine.LNX.4.61.0705201807470.918@www>
Message-ID: <4650ED0D.9000204@iDIAcomputing.com>

Trent Jarvi wrote:
> On Sun, 20 May 2007, George Dinwiddie wrote:
> 
>> Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
>> has no data available, I get
>> java.io.IOException: Underlying input stream returned zero bytes
>>     at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)
>>
>> This is using code that worked fine with Sun's javax.comm API (the old
>> 2.0 version) until a JVM upgrade broke it.
>>
>> Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
>> have a C compiler on this box.  As near as I can tell from reading the
>> Java source, this means the open() call didn't grab a file descriptor.
>>
>>  - George
>>
>>
> 
> Hi George,
> 
> Perhaps changing the threshold and or timeout may result in the behavior 
> you expect.

Thanks, Trent.  Any suggestions on values?

BTW, The javax.comm 2.0 library seems to enable the timeout when opened as:

   CommPortIdentifier portId =
       CommPortIdentifier.getPortIdentifier(
		serialPortParams.getPortName());
   int timeout = 60000;
   serialPort = (SerialPort) portId.open(processname,
					timeout);

When I
       serialPort.enableReceiveTimeout(timeout);
       serialPort.enableReceiveThreshold(1);
I don't seem to receive any characters.

  - George

-- 
  ----------------------------------------------------------------------
   * George Dinwiddie *                      http://blog.gdinwiddie.com
   Software Development                    http://www.idiacomputing.com
   Consultant and Coach                    http://www.agilemaryland.org
  ----------------------------------------------------------------------



From support at kartmanager.de  Mon May 14 08:43:08 2007
From: support at kartmanager.de (Andre Geisler)
Date: Mon, 14 May 2007 16:43:08 +0200
Subject: [Rxtx] Problem on closing Ports
Message-ID: <4648757C.8080601@kartmanager.de>

Hello,

i have got a small problem on closing serail ports.
The following class manages the my serials connection an
is handeled by an object calles kbn which lays in a java
swin gui:

public class Serial implements SerialPortEventListener{
   
    private static CommPortIdentifier portId;
    private static Enumeration          portList;
    private InputStream              inputStream;
    private OutputStream        outputStream;
    private SerialPort              serialPort;
    private AmbHandler ambh = new AmbHandler();
    private String              defaultPort = "/dev/ttyS0";
    private Kartbahnnutzung kbn;
   
    public Serial() {}
   
    public void connect(){
        boolean              portFound = false;
      
        portList = CommPortIdentifier.getPortIdentifiers();

        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                if (portId.getName().equals(defaultPort)) {
                    System.out.println("Found port: "+defaultPort);
                    portFound = true;
                }
            }
        }
        if (!portFound) {
            System.out.println("port " + defaultPort + " not found.");
        }
       
        try {
            serialPort = (SerialPort) portId.open("Kartman Read Thread", 
2000);
        } catch (PortInUseException e) {}

        try {
            inputStream = serialPort.getInputStream();
            outputStream = serialPort.getOutputStream();
        } catch (IOException e) {}

        try {
            serialPort.addEventListener(this);
        } catch (TooManyListenersException e) {}

        serialPort.notifyOnDataAvailable(true);

        try {
            serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,
                           SerialPort.STOPBITS_2,
                           SerialPort.PARITY_NONE);
        } catch (UnsupportedCommOperationException e){}
        
    }

    public void serialEvent(SerialPortEvent event) {
        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
            break;

        case SerialPortEvent.DATA_AVAILABLE:
            byte[] readBuffer =new byte[25];
           
       
           int numBytes=0;
            try {
               
            while (inputStream.available() > 0) {
                numBytes = inputStream.read(readBuffer);
                System.out.println("String: "+ new 
String(readBuffer,0,numBytes));
                System.out.println("Anzahl der bytes: "+numBytes);
                ambh.newMessage(new String(readBuffer,0,numBytes));
                readBuffer = new byte[25];
            }
            if(ambh.isPacketComplete()){
                System.out.println("Complete packet? 
"+ambh.isPacketComplete());
                kbn.addErgebnis(ambh.getLastPacket());
                System.out.println("Letzte 
Nachricht:"+ambh.getLastPacket().getMessage());
            }
            } catch (IOException e) {System.out.println("Ups!");}

            break;
        }
    }
   
    public void simpleWrite(char c){
       
        try{               
           
            this.outputStream.write(c);
                           
        }catch ( IOException e ){
            e.printStackTrace();
        }           
    }
   
    public void disconnect(){
        serialPort.removeEventListener();
        serialPort.close();
        System.out.println(defaultPort+" is closed!");
    }
   
    public ArrayList<AmbPacket> getAmbArray(){
        return ambh.getPacketarr();
    }
    public void setKartbahnnutzung(Kartbahnnutzung kbn){
        this.kbn=kbn;
    }

}

I have got a button called which closes the connection.
Everything is ok, it is calling an method from kbn which calls
serialcon.disconnect();

But there is also the possibility that the kbn object closes the 
connection it self.
It uses the same function "serial.disconnect()". The function itself is 
startetd,
but it does not close the connection. Nothing els happens, no exception, 
no ...
The program stops, and else happens.
Is there a better way to close this connection???

regards

-- 
Mit freundlichen Gr??en

Andr? Geisler
http://www.kartmanager.de
support at kartmanager.de



From rithy8 at gmail.com  Mon May 14 12:16:39 2007
From: rithy8 at gmail.com (rithy roth)
Date: Mon, 14 May 2007 11:16:39 -0700
Subject: [Rxtx] please help on when read time out occurs
Message-ID: <79e2547b0705141116q6138850sdb937a6fe74b5eb3@mail.gmail.com>

Hi,

I've been looking for some doc regarding what enableReceiveTimeout() is
doing( which event is generated) when a read time out occurs. Also, I am not
sure myself what to do in my code when a timeout happens. Could someone
please
help?

Thanks

========================================

Here is a portion of my code:

After opening my serial port, I issued the following:
...
     try {
        sPort.enableReceiveTimeout(30);
    } catch (UnsupportedCommOperationException e) {
         throw new SerialConnectionException("Enable Receive Timeout not
supported");
    }
...

Then, on my read I just have a listener on event notification:

   public void serialEvent(SerialPortEvent e) {

    // Create a StringBuffer and int to receive input data.
    StringBuffer inputBuffer = new StringBuffer();
    int         newData = 0;

    // Determine type of event.
    switch (e.getEventType()) {

    // Read data until -1 is returned. If \r is received substitute
    // \n for correct newline handling.
    case SerialPortEvent.DATA_AVAILABLE:
           // System.out.println("data available");
        while (newData != -1) {
        try {
           newData = is.read();

           if (newData == -1) {
            break;
            }


            inputBuffer.append((char) newData);

        } catch (IOException ex) {
         System.err.println(ex);

            return;
        }
      }

        break;

    // If break event append BREAK RECEIVED message.
    case SerialPortEvent.BI:
       // messageAreaIn.append("\n--- BREAK RECEIVED ---\n");
             Utils.debugprint("\n--- BREAK RECEIVED ---\n");
    }
    }
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From info at haberkamp.com  Tue May 15 04:27:10 2007
From: info at haberkamp.com (Guido Haberkamp IT-Beratung)
Date: Tue, 15 May 2007 12:27:10 +0200
Subject: [Rxtx] CommPortIdentifier "hangs"
Message-ID: <46498AFE.7050307@haberkamp.com>

Hello,

I couldn't find a solution to my problem or even anybody else mentioning
this problem on the net, so I'm asking you all for help.

I'm trying to use rxtx2.1.7 But when I try to get the portId from
CommPortIdentifier.getPortIdentifier("COM1")
It takes 3min50sec for the method to return the value.
After that everything works fine.

Connecting via Hyperterminal to the same port shows no noticable delay


I'll include my code at the end of this posting

Thanks for your help.
Guido


Here some details to my programming environment:

Windows 2000 Prof.
IBM T23 with one built-in Comport ("COM1"),
another one via USB-Serial Adapter (ATEN, COM5 or COM8)
COM10-17 are assigned because of a VS Netcom Device that connects 8
Serial ports over one tcp/ip link

Eclipse 3.2.2
Java 1.5.0
rxtx-2.1-7r2


I'm new to Java programming in general and serial port communication in
particular, so I'd really appreciate  also some hints if I use rxtx
completely the wrong way.

at Captain.at there's a code example that iterates through all available
ports (including parallel ports), but that code gave me many strange
exceptions,
so I changed it to opening the required port directly.


Here's my code:

import gnu.io.CommPort;

import gnu.io.CommPortIdentifier;

import gnu.io.NoSuchPortException;

import gnu.io.PortInUseException;

import gnu.io.SerialPort;

import gnu.io.SerialPortEvent;

import gnu.io.SerialPortEventListener;

import gnu.io.UnsupportedCommOperationException;



import java.io.BufferedReader;

import java.io.FileDescriptor;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.util.Date;

import java.util.Enumeration;

import java.util.TooManyListenersException;

import java.util.prefs.Preferences;

import logic.Parser;



/**

 * TODO Add comment here

 * @author  $Author:  $

 * @version  $Revision:  $, $Date:  $ UTC

 */

public class SerialCommunicator implements SerialPortEventListener

{

    static CommPortIdentifier portId = null;

    static Enumeration portList = null;

    String appName = null;

    private int baudRate = 0;

    private String device = null;

//    InputStream in = null;

    BufferedReader in = null;

    private String lineRead = null;

    OutputStream out = null;

    private Parser parser = null;

    private String portName = null;

    private Preferences prefs = null;

    public Thread readerThread = null;

    private SerialPort serialPort = null;

    int timeout = 0;

    public Thread writerThread = null;



    public SerialCommunicator(Parser p, Preferences pr, String dev)

    {



        super();

        this.parser = p;

        this.prefs = pr;

        this.device = dev;

//        TODO: assertions p, pr, d != null

        Preferences node = prefs.node("General");

        this.timeout = node.getInt("timeout", 0);

        node = prefs.node(device);

        this.portName = node.get("portName", null);

        this.baudRate = node.getInt("baudRate", 0);

        this.appName = node.get("appName", null);



        System.out.println("Trying to connect to port "+portName);

        Date date = new Date();

        System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        if (foundPort(portName)){

            try {

                connect();

            } catch (Exception e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

            date = new Date();

            System.out.println("Connected to port "+portName);

            System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        }

        else {

            System.out.println("Could not connect");

        }

    }



    boolean foundPort (String port){

        boolean portFound = false;

        try {

//            portId = CommPortIdentifier.getPortIdentifier(port);

            portId = CommPortIdentifier.getPortIdentifier("COM5");

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        if ( portId.isCurrentlyOwned() )

        {

            System.out.println("Error: Port is currently in use");

        }

        else {

            portFound = true;

        }

        return portFound;

    }

    void connect () throws Exception

    {

        this.openPort(portName);

        this.setInputStream();

        this.setParameters();

    }

    void openPort (String port){



        try {

            serialPort = (SerialPort) portId.open(appName, timeout);

        } catch (PortInUseException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }



    void setInputStream (){

        try {

            this.in = new BufferedReader(new
InputStreamReader(this.serialPort.getInputStream()));

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        serialPort.notifyOnDataAvailable(true);

        try {

            serialPort.addEventListener(this);

        } catch (TooManyListenersException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }



    }





    void setParameters(){

        try {

            this.serialPort.setSerialPortParams(baudRate,
SerialPort.DATABITS_8, SerialPort.STOPBITS_1,

                    SerialPort.PARITY_NONE);

        } catch (UnsupportedCommOperationException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }











    public void serialEvent(SerialPortEvent event) {

        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:

            break;

        case SerialPortEvent.DATA_AVAILABLE:

            try {

                this.lineRead = this.in.readLine();

                System.out.println("Read: "+lineRead);

            }

            catch (IOException e) {}



            break;

        }

    }





}


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From murato at mobiliz.com.tr  Wed May 16 06:58:50 2007
From: murato at mobiliz.com.tr (Murat Ozdemir)
Date: Wed, 16 May 2007 15:58:50 +0300
Subject: [Rxtx] java.io.IOException: No error in nativeDrain
Message-ID: <E3BF513AF070D741AE92D4780D6813A314A2EE@mobilizdc.mobiliz.com.tr>

Hello all,
i'm using RXTX 2.1 with JSmsLib 2.1.0
 
When i'm trying to run that framework, i'm getting exceptions from RXTX
Library as;
 
java.io.IOException: No error in nativeDrain
at gnu.io.RXTXPort.nativeDrain(Native Method)
at gnu.io.RXTXPort$SerialOutputStream.flush(RXTXPort.java:1201)
at org.smslib.CSerialDriver.send(CSerialDriver.java:206)
at org.smslib.handler.CATHandler.sync(CATHandler.java:43)
at org.smslib.CService.connect(CService.java:539)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.doIt(ReadMessagesAsync.java:92)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.main(ReadMessagesAsync.java:140)
 
 
Also, 
when i've read the README for rxtxSerial.dll faced that;
 
Wed Mar  1 12:01:05 MST 2006
rxtxSerial.dll had to be recomopiled to link in missing native methods.
 
what should i do? How can i recompile the dll?
 
---------------
Murat OZDEMiR
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From Alec.Cawley at quantel.com  Thu May 17 06:14:45 2007
From: Alec.Cawley at quantel.com (Alec.Cawley@quantel.com)
Date: Thu, 17 May 2007 13:14:45 +0100
Subject: [Rxtx] Source or javadox for javax.comm API
Message-ID: <OFCB4EC68D.D9F23803-ON802572DE.004266E0-802572DE.00434257@Research.Quantel>

I want to access serial ports on Windows from Java. I get think I 
understand how to compile and run - put RXTXcomm.jar in my classpath, put 
the appropriate DLLs in the DLL search path. But what about me? How do I 
lean how to use it? There is no javax.comm in the api Javadoc with the 
JAVA SDK 6.1, and I can only find on-line javadoc for it. I would prefer 
not to be dependant on on-line resources *all* the time. Is there 
somewhere I can download javax.comm.java or a bundle of the Javadocs 
generated from it?

Alec Cawley

-- 
This e-mail is intended for the named addressees only. Its contents may be 
privileged or confidential and should be treated as such. If you are not 
an intended recipient please notify the sender immediately and then delete 
it;  do not copy, distribute, or take any action based on this e-mail. In 
the pursuit of its legitimate business activities and its conformance with 
relevant legislation, Quantel may access any e-mail (including 
attachments) it originates or receives, for potential scrutiny. 

Quantel is the trade name used by Quantel Holdings Limited and its 
subsidiaries.  Quantel Holdings Limited is registered in England & Wales. 
Registration No: 4004913 
Contact details for all Quantel Offices and Companies can be found on our 
website www.quantel.com or by writing to the holding company.
Registered address: Turnpike Road, Newbury, Berkshire, RG14 2NX, United 
Kingdom 


From h.mayer at inode.at  Sat May 19 10:01:39 2007
From: h.mayer at inode.at (Hannes Mayer)
Date: Sat, 19 May 2007 18:01:39 +0200
Subject: [Rxtx] RXTX hangs (100% cpu) when using USB-to-Serial converter
Message-ID: <464F1F63.4020302@inode.at>

Hi all!

I was testing my new USB-to-Serial converter with the
SimpleRead.java application, but it hangs with 100%
cpu.

I also have an own app, which sends a string and
tries to receive it. I use a null-modem - while sending
works (I can see the string with "cat /dev/ttyUSB0"),
the serialEvent is not fired and 100% cpu is the result.

Doing the same (sending a string and receiving) with
some C code works.

Has anyone see the same behaviour and is there a fix
somewhere ?

Thanks!
Cheers,
Hannes.


From h.mayer at inode.at  Sat May 19 12:36:57 2007
From: h.mayer at inode.at (Hannes Mayer)
Date: Sat, 19 May 2007 20:36:57 +0200
Subject: [Rxtx] RXTX hangs (100% cpu) when using USB-to-Serial converter
In-Reply-To: <464F1F63.4020302@inode.at>
References: <464F1F63.4020302@inode.at>
Message-ID: <464F43C9.2000003@inode.at>

Hannes Mayer wrote:
> Hi all!
> 
> I was testing my new USB-to-Serial converter with the
> SimpleRead.java application, but it hangs with 100%
> cpu.

Found the problem!
Removing
serialPort.notifyOnOutputEmpty(true);
resolves this issue.
It seems that the usbserial driver doesn't support this.

Cheers,
Hannes.




From lists at iDIAcomputing.com  Sun May 20 17:59:11 2007
From: lists at iDIAcomputing.com (George Dinwiddie)
Date: Sun, 20 May 2007 19:59:11 -0400
Subject: [Rxtx] Underlying input stream returned zero bytes
Message-ID: <4650E0CF.8040900@iDIAcomputing.com>

Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
has no data available, I get
java.io.IOException: Underlying input stream returned zero bytes
	at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)

This is using code that worked fine with Sun's javax.comm API (the old
2.0 version) until a JVM upgrade broke it.

Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
have a C compiler on this box.  As near as I can tell from reading the
Java source, this means the open() call didn't grab a file descriptor.

  - George

-- 
  ----------------------------------------------------------------------
   * George Dinwiddie *                      http://blog.gdinwiddie.com
   Software Development                    http://www.idiacomputing.com
   Consultant and Coach                    http://www.agilemaryland.org
  ----------------------------------------------------------------------



From tjarvi at qbang.org  Sun May 20 18:08:39 2007
From: tjarvi at qbang.org (Trent Jarvi)
Date: Sun, 20 May 2007 18:08:39 -0600 (MDT)
Subject: [Rxtx] Underlying input stream returned zero bytes
In-Reply-To: <4650E0CF.8040900@iDIAcomputing.com>
References: <4650E0CF.8040900@iDIAcomputing.com>
Message-ID: <Pine.LNX.4.61.0705201807470.918@www>

On Sun, 20 May 2007, George Dinwiddie wrote:

> Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
> has no data available, I get
> java.io.IOException: Underlying input stream returned zero bytes
> 	at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)
>
> This is using code that worked fine with Sun's javax.comm API (the old
> 2.0 version) until a JVM upgrade broke it.
>
> Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
> have a C compiler on this box.  As near as I can tell from reading the
> Java source, this means the open() call didn't grab a file descriptor.
>
>  - George
>
>

Hi George,

Perhaps changing the threshold and or timeout may result in the behavior 
you expect.

--
Trent Jarvi
tjarvi at qbang.org


From lists at iDIAcomputing.com  Sun May 20 18:51:25 2007
From: lists at iDIAcomputing.com (George Dinwiddie)
Date: Sun, 20 May 2007 20:51:25 -0400
Subject: [Rxtx] Underlying input stream returned zero bytes
In-Reply-To: <Pine.LNX.4.61.0705201807470.918@www>
References: <4650E0CF.8040900@iDIAcomputing.com>
	<Pine.LNX.4.61.0705201807470.918@www>
Message-ID: <4650ED0D.9000204@iDIAcomputing.com>

Trent Jarvi wrote:
> On Sun, 20 May 2007, George Dinwiddie wrote:
> 
>> Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
>> has no data available, I get
>> java.io.IOException: Underlying input stream returned zero bytes
>>     at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)
>>
>> This is using code that worked fine with Sun's javax.comm API (the old
>> 2.0 version) until a JVM upgrade broke it.
>>
>> Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
>> have a C compiler on this box.  As near as I can tell from reading the
>> Java source, this means the open() call didn't grab a file descriptor.
>>
>>  - George
>>
>>
> 
> Hi George,
> 
> Perhaps changing the threshold and or timeout may result in the behavior 
> you expect.

Thanks, Trent.  Any suggestions on values?

BTW, The javax.comm 2.0 library seems to enable the timeout when opened as:

   CommPortIdentifier portId =
       CommPortIdentifier.getPortIdentifier(
		serialPortParams.getPortName());
   int timeout = 60000;
   serialPort = (SerialPort) portId.open(processname,
					timeout);

When I
       serialPort.enableReceiveTimeout(timeout);
       serialPort.enableReceiveThreshold(1);
I don't seem to receive any characters.

  - George

-- 
  ----------------------------------------------------------------------
   * George Dinwiddie *                      http://blog.gdinwiddie.com
   Software Development                    http://www.idiacomputing.com
   Consultant and Coach                    http://www.agilemaryland.org
  ----------------------------------------------------------------------



From support at kartmanager.de  Mon May 14 08:43:08 2007
From: support at kartmanager.de (Andre Geisler)
Date: Mon, 14 May 2007 16:43:08 +0200
Subject: [Rxtx] Problem on closing Ports
Message-ID: <4648757C.8080601@kartmanager.de>

Hello,

i have got a small problem on closing serail ports.
The following class manages the my serials connection an
is handeled by an object calles kbn which lays in a java
swin gui:

public class Serial implements SerialPortEventListener{
   
    private static CommPortIdentifier portId;
    private static Enumeration          portList;
    private InputStream              inputStream;
    private OutputStream        outputStream;
    private SerialPort              serialPort;
    private AmbHandler ambh = new AmbHandler();
    private String              defaultPort = "/dev/ttyS0";
    private Kartbahnnutzung kbn;
   
    public Serial() {}
   
    public void connect(){
        boolean              portFound = false;
      
        portList = CommPortIdentifier.getPortIdentifiers();

        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                if (portId.getName().equals(defaultPort)) {
                    System.out.println("Found port: "+defaultPort);
                    portFound = true;
                }
            }
        }
        if (!portFound) {
            System.out.println("port " + defaultPort + " not found.");
        }
       
        try {
            serialPort = (SerialPort) portId.open("Kartman Read Thread", 
2000);
        } catch (PortInUseException e) {}

        try {
            inputStream = serialPort.getInputStream();
            outputStream = serialPort.getOutputStream();
        } catch (IOException e) {}

        try {
            serialPort.addEventListener(this);
        } catch (TooManyListenersException e) {}

        serialPort.notifyOnDataAvailable(true);

        try {
            serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,
                           SerialPort.STOPBITS_2,
                           SerialPort.PARITY_NONE);
        } catch (UnsupportedCommOperationException e){}
        
    }

    public void serialEvent(SerialPortEvent event) {
        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
            break;

        case SerialPortEvent.DATA_AVAILABLE:
            byte[] readBuffer =new byte[25];
           
       
           int numBytes=0;
            try {
               
            while (inputStream.available() > 0) {
                numBytes = inputStream.read(readBuffer);
                System.out.println("String: "+ new 
String(readBuffer,0,numBytes));
                System.out.println("Anzahl der bytes: "+numBytes);
                ambh.newMessage(new String(readBuffer,0,numBytes));
                readBuffer = new byte[25];
            }
            if(ambh.isPacketComplete()){
                System.out.println("Complete packet? 
"+ambh.isPacketComplete());
                kbn.addErgebnis(ambh.getLastPacket());
                System.out.println("Letzte 
Nachricht:"+ambh.getLastPacket().getMessage());
            }
            } catch (IOException e) {System.out.println("Ups!");}

            break;
        }
    }
   
    public void simpleWrite(char c){
       
        try{               
           
            this.outputStream.write(c);
                           
        }catch ( IOException e ){
            e.printStackTrace();
        }           
    }
   
    public void disconnect(){
        serialPort.removeEventListener();
        serialPort.close();
        System.out.println(defaultPort+" is closed!");
    }
   
    public ArrayList<AmbPacket> getAmbArray(){
        return ambh.getPacketarr();
    }
    public void setKartbahnnutzung(Kartbahnnutzung kbn){
        this.kbn=kbn;
    }

}

I have got a button called which closes the connection.
Everything is ok, it is calling an method from kbn which calls
serialcon.disconnect();

But there is also the possibility that the kbn object closes the 
connection it self.
It uses the same function "serial.disconnect()". The function itself is 
startetd,
but it does not close the connection. Nothing els happens, no exception, 
no ...
The program stops, and else happens.
Is there a better way to close this connection???

regards

-- 
Mit freundlichen Gr??en

Andr? Geisler
http://www.kartmanager.de
support at kartmanager.de



From rithy8 at gmail.com  Mon May 14 12:16:39 2007
From: rithy8 at gmail.com (rithy roth)
Date: Mon, 14 May 2007 11:16:39 -0700
Subject: [Rxtx] please help on when read time out occurs
Message-ID: <79e2547b0705141116q6138850sdb937a6fe74b5eb3@mail.gmail.com>

Hi,

I've been looking for some doc regarding what enableReceiveTimeout() is
doing( which event is generated) when a read time out occurs. Also, I am not
sure myself what to do in my code when a timeout happens. Could someone
please
help?

Thanks

========================================

Here is a portion of my code:

After opening my serial port, I issued the following:
...
     try {
        sPort.enableReceiveTimeout(30);
    } catch (UnsupportedCommOperationException e) {
         throw new SerialConnectionException("Enable Receive Timeout not
supported");
    }
...

Then, on my read I just have a listener on event notification:

   public void serialEvent(SerialPortEvent e) {

    // Create a StringBuffer and int to receive input data.
    StringBuffer inputBuffer = new StringBuffer();
    int         newData = 0;

    // Determine type of event.
    switch (e.getEventType()) {

    // Read data until -1 is returned. If \r is received substitute
    // \n for correct newline handling.
    case SerialPortEvent.DATA_AVAILABLE:
           // System.out.println("data available");
        while (newData != -1) {
        try {
           newData = is.read();

           if (newData == -1) {
            break;
            }


            inputBuffer.append((char) newData);

        } catch (IOException ex) {
         System.err.println(ex);

            return;
        }
      }

        break;

    // If break event append BREAK RECEIVED message.
    case SerialPortEvent.BI:
       // messageAreaIn.append("\n--- BREAK RECEIVED ---\n");
             Utils.debugprint("\n--- BREAK RECEIVED ---\n");
    }
    }
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From info at haberkamp.com  Tue May 15 04:27:10 2007
From: info at haberkamp.com (Guido Haberkamp IT-Beratung)
Date: Tue, 15 May 2007 12:27:10 +0200
Subject: [Rxtx] CommPortIdentifier "hangs"
Message-ID: <46498AFE.7050307@haberkamp.com>

Hello,

I couldn't find a solution to my problem or even anybody else mentioning
this problem on the net, so I'm asking you all for help.

I'm trying to use rxtx2.1.7 But when I try to get the portId from
CommPortIdentifier.getPortIdentifier("COM1")
It takes 3min50sec for the method to return the value.
After that everything works fine.

Connecting via Hyperterminal to the same port shows no noticable delay


I'll include my code at the end of this posting

Thanks for your help.
Guido


Here some details to my programming environment:

Windows 2000 Prof.
IBM T23 with one built-in Comport ("COM1"),
another one via USB-Serial Adapter (ATEN, COM5 or COM8)
COM10-17 are assigned because of a VS Netcom Device that connects 8
Serial ports over one tcp/ip link

Eclipse 3.2.2
Java 1.5.0
rxtx-2.1-7r2


I'm new to Java programming in general and serial port communication in
particular, so I'd really appreciate  also some hints if I use rxtx
completely the wrong way.

at Captain.at there's a code example that iterates through all available
ports (including parallel ports), but that code gave me many strange
exceptions,
so I changed it to opening the required port directly.


Here's my code:

import gnu.io.CommPort;

import gnu.io.CommPortIdentifier;

import gnu.io.NoSuchPortException;

import gnu.io.PortInUseException;

import gnu.io.SerialPort;

import gnu.io.SerialPortEvent;

import gnu.io.SerialPortEventListener;

import gnu.io.UnsupportedCommOperationException;



import java.io.BufferedReader;

import java.io.FileDescriptor;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.util.Date;

import java.util.Enumeration;

import java.util.TooManyListenersException;

import java.util.prefs.Preferences;

import logic.Parser;



/**

 * TODO Add comment here

 * @author  $Author:  $

 * @version  $Revision:  $, $Date:  $ UTC

 */

public class SerialCommunicator implements SerialPortEventListener

{

    static CommPortIdentifier portId = null;

    static Enumeration portList = null;

    String appName = null;

    private int baudRate = 0;

    private String device = null;

//    InputStream in = null;

    BufferedReader in = null;

    private String lineRead = null;

    OutputStream out = null;

    private Parser parser = null;

    private String portName = null;

    private Preferences prefs = null;

    public Thread readerThread = null;

    private SerialPort serialPort = null;

    int timeout = 0;

    public Thread writerThread = null;



    public SerialCommunicator(Parser p, Preferences pr, String dev)

    {



        super();

        this.parser = p;

        this.prefs = pr;

        this.device = dev;

//        TODO: assertions p, pr, d != null

        Preferences node = prefs.node("General");

        this.timeout = node.getInt("timeout", 0);

        node = prefs.node(device);

        this.portName = node.get("portName", null);

        this.baudRate = node.getInt("baudRate", 0);

        this.appName = node.get("appName", null);



        System.out.println("Trying to connect to port "+portName);

        Date date = new Date();

        System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        if (foundPort(portName)){

            try {

                connect();

            } catch (Exception e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

            date = new Date();

            System.out.println("Connected to port "+portName);

            System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        }

        else {

            System.out.println("Could not connect");

        }

    }



    boolean foundPort (String port){

        boolean portFound = false;

        try {

//            portId = CommPortIdentifier.getPortIdentifier(port);

            portId = CommPortIdentifier.getPortIdentifier("COM5");

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        if ( portId.isCurrentlyOwned() )

        {

            System.out.println("Error: Port is currently in use");

        }

        else {

            portFound = true;

        }

        return portFound;

    }

    void connect () throws Exception

    {

        this.openPort(portName);

        this.setInputStream();

        this.setParameters();

    }

    void openPort (String port){



        try {

            serialPort = (SerialPort) portId.open(appName, timeout);

        } catch (PortInUseException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }



    void setInputStream (){

        try {

            this.in = new BufferedReader(new
InputStreamReader(this.serialPort.getInputStream()));

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        serialPort.notifyOnDataAvailable(true);

        try {

            serialPort.addEventListener(this);

        } catch (TooManyListenersException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }



    }





    void setParameters(){

        try {

            this.serialPort.setSerialPortParams(baudRate,
SerialPort.DATABITS_8, SerialPort.STOPBITS_1,

                    SerialPort.PARITY_NONE);

        } catch (UnsupportedCommOperationException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }











    public void serialEvent(SerialPortEvent event) {

        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:

            break;

        case SerialPortEvent.DATA_AVAILABLE:

            try {

                this.lineRead = this.in.readLine();

                System.out.println("Read: "+lineRead);

            }

            catch (IOException e) {}



            break;

        }

    }





}


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From murato at mobiliz.com.tr  Wed May 16 06:58:50 2007
From: murato at mobiliz.com.tr (Murat Ozdemir)
Date: Wed, 16 May 2007 15:58:50 +0300
Subject: [Rxtx] java.io.IOException: No error in nativeDrain
Message-ID: <E3BF513AF070D741AE92D4780D6813A314A2EE@mobilizdc.mobiliz.com.tr>

Hello all,
i'm using RXTX 2.1 with JSmsLib 2.1.0
 
When i'm trying to run that framework, i'm getting exceptions from RXTX
Library as;
 
java.io.IOException: No error in nativeDrain
at gnu.io.RXTXPort.nativeDrain(Native Method)
at gnu.io.RXTXPort$SerialOutputStream.flush(RXTXPort.java:1201)
at org.smslib.CSerialDriver.send(CSerialDriver.java:206)
at org.smslib.handler.CATHandler.sync(CATHandler.java:43)
at org.smslib.CService.connect(CService.java:539)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.doIt(ReadMessagesAsync.java:92)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.main(ReadMessagesAsync.java:140)
 
 
Also, 
when i've read the README for rxtxSerial.dll faced that;
 
Wed Mar  1 12:01:05 MST 2006
rxtxSerial.dll had to be recomopiled to link in missing native methods.
 
what should i do? How can i recompile the dll?
 
---------------
Murat OZDEMiR
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From Alec.Cawley at quantel.com  Thu May 17 06:14:45 2007
From: Alec.Cawley at quantel.com (Alec.Cawley@quantel.com)
Date: Thu, 17 May 2007 13:14:45 +0100
Subject: [Rxtx] Source or javadox for javax.comm API
Message-ID: <OFCB4EC68D.D9F23803-ON802572DE.004266E0-802572DE.00434257@Research.Quantel>

I want to access serial ports on Windows from Java. I get think I 
understand how to compile and run - put RXTXcomm.jar in my classpath, put 
the appropriate DLLs in the DLL search path. But what about me? How do I 
lean how to use it? There is no javax.comm in the api Javadoc with the 
JAVA SDK 6.1, and I can only find on-line javadoc for it. I would prefer 
not to be dependant on on-line resources *all* the time. Is there 
somewhere I can download javax.comm.java or a bundle of the Javadocs 
generated from it?

Alec Cawley

-- 
This e-mail is intended for the named addressees only. Its contents may be 
privileged or confidential and should be treated as such. If you are not 
an intended recipient please notify the sender immediately and then delete 
it;  do not copy, distribute, or take any action based on this e-mail. In 
the pursuit of its legitimate business activities and its conformance with 
relevant legislation, Quantel may access any e-mail (including 
attachments) it originates or receives, for potential scrutiny. 

Quantel is the trade name used by Quantel Holdings Limited and its 
subsidiaries.  Quantel Holdings Limited is registered in England & Wales. 
Registration No: 4004913 
Contact details for all Quantel Offices and Companies can be found on our 
website www.quantel.com or by writing to the holding company.
Registered address: Turnpike Road, Newbury, Berkshire, RG14 2NX, United 
Kingdom 


From h.mayer at inode.at  Sat May 19 10:01:39 2007
From: h.mayer at inode.at (Hannes Mayer)
Date: Sat, 19 May 2007 18:01:39 +0200
Subject: [Rxtx] RXTX hangs (100% cpu) when using USB-to-Serial converter
Message-ID: <464F1F63.4020302@inode.at>

Hi all!

I was testing my new USB-to-Serial converter with the
SimpleRead.java application, but it hangs with 100%
cpu.

I also have an own app, which sends a string and
tries to receive it. I use a null-modem - while sending
works (I can see the string with "cat /dev/ttyUSB0"),
the serialEvent is not fired and 100% cpu is the result.

Doing the same (sending a string and receiving) with
some C code works.

Has anyone see the same behaviour and is there a fix
somewhere ?

Thanks!
Cheers,
Hannes.


From h.mayer at inode.at  Sat May 19 12:36:57 2007
From: h.mayer at inode.at (Hannes Mayer)
Date: Sat, 19 May 2007 20:36:57 +0200
Subject: [Rxtx] RXTX hangs (100% cpu) when using USB-to-Serial converter
In-Reply-To: <464F1F63.4020302@inode.at>
References: <464F1F63.4020302@inode.at>
Message-ID: <464F43C9.2000003@inode.at>

Hannes Mayer wrote:
> Hi all!
> 
> I was testing my new USB-to-Serial converter with the
> SimpleRead.java application, but it hangs with 100%
> cpu.

Found the problem!
Removing
serialPort.notifyOnOutputEmpty(true);
resolves this issue.
It seems that the usbserial driver doesn't support this.

Cheers,
Hannes.




From lists at iDIAcomputing.com  Sun May 20 17:59:11 2007
From: lists at iDIAcomputing.com (George Dinwiddie)
Date: Sun, 20 May 2007 19:59:11 -0400
Subject: [Rxtx] Underlying input stream returned zero bytes
Message-ID: <4650E0CF.8040900@iDIAcomputing.com>

Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
has no data available, I get
java.io.IOException: Underlying input stream returned zero bytes
	at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)

This is using code that worked fine with Sun's javax.comm API (the old
2.0 version) until a JVM upgrade broke it.

Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
have a C compiler on this box.  As near as I can tell from reading the
Java source, this means the open() call didn't grab a file descriptor.

  - George

-- 
  ----------------------------------------------------------------------
   * George Dinwiddie *                      http://blog.gdinwiddie.com
   Software Development                    http://www.idiacomputing.com
   Consultant and Coach                    http://www.agilemaryland.org
  ----------------------------------------------------------------------



From tjarvi at qbang.org  Sun May 20 18:08:39 2007
From: tjarvi at qbang.org (Trent Jarvi)
Date: Sun, 20 May 2007 18:08:39 -0600 (MDT)
Subject: [Rxtx] Underlying input stream returned zero bytes
In-Reply-To: <4650E0CF.8040900@iDIAcomputing.com>
References: <4650E0CF.8040900@iDIAcomputing.com>
Message-ID: <Pine.LNX.4.61.0705201807470.918@www>

On Sun, 20 May 2007, George Dinwiddie wrote:

> Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
> has no data available, I get
> java.io.IOException: Underlying input stream returned zero bytes
> 	at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)
>
> This is using code that worked fine with Sun's javax.comm API (the old
> 2.0 version) until a JVM upgrade broke it.
>
> Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
> have a C compiler on this box.  As near as I can tell from reading the
> Java source, this means the open() call didn't grab a file descriptor.
>
>  - George
>
>

Hi George,

Perhaps changing the threshold and or timeout may result in the behavior 
you expect.

--
Trent Jarvi
tjarvi at qbang.org


From lists at iDIAcomputing.com  Sun May 20 18:51:25 2007
From: lists at iDIAcomputing.com (George Dinwiddie)
Date: Sun, 20 May 2007 20:51:25 -0400
Subject: [Rxtx] Underlying input stream returned zero bytes
In-Reply-To: <Pine.LNX.4.61.0705201807470.918@www>
References: <4650E0CF.8040900@iDIAcomputing.com>
	<Pine.LNX.4.61.0705201807470.918@www>
Message-ID: <4650ED0D.9000204@iDIAcomputing.com>

Trent Jarvi wrote:
> On Sun, 20 May 2007, George Dinwiddie wrote:
> 
>> Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
>> has no data available, I get
>> java.io.IOException: Underlying input stream returned zero bytes
>>     at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)
>>
>> This is using code that worked fine with Sun's javax.comm API (the old
>> 2.0 version) until a JVM upgrade broke it.
>>
>> Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
>> have a C compiler on this box.  As near as I can tell from reading the
>> Java source, this means the open() call didn't grab a file descriptor.
>>
>>  - George
>>
>>
> 
> Hi George,
> 
> Perhaps changing the threshold and or timeout may result in the behavior 
> you expect.

Thanks, Trent.  Any suggestions on values?

BTW, The javax.comm 2.0 library seems to enable the timeout when opened as:

   CommPortIdentifier portId =
       CommPortIdentifier.getPortIdentifier(
		serialPortParams.getPortName());
   int timeout = 60000;
   serialPort = (SerialPort) portId.open(processname,
					timeout);

When I
       serialPort.enableReceiveTimeout(timeout);
       serialPort.enableReceiveThreshold(1);
I don't seem to receive any characters.

  - George

-- 
  ----------------------------------------------------------------------
   * George Dinwiddie *                      http://blog.gdinwiddie.com
   Software Development                    http://www.idiacomputing.com
   Consultant and Coach                    http://www.agilemaryland.org
  ----------------------------------------------------------------------



From support at kartmanager.de  Mon May 14 08:43:08 2007
From: support at kartmanager.de (Andre Geisler)
Date: Mon, 14 May 2007 16:43:08 +0200
Subject: [Rxtx] Problem on closing Ports
Message-ID: <4648757C.8080601@kartmanager.de>

Hello,

i have got a small problem on closing serail ports.
The following class manages the my serials connection an
is handeled by an object calles kbn which lays in a java
swin gui:

public class Serial implements SerialPortEventListener{
   
    private static CommPortIdentifier portId;
    private static Enumeration          portList;
    private InputStream              inputStream;
    private OutputStream        outputStream;
    private SerialPort              serialPort;
    private AmbHandler ambh = new AmbHandler();
    private String              defaultPort = "/dev/ttyS0";
    private Kartbahnnutzung kbn;
   
    public Serial() {}
   
    public void connect(){
        boolean              portFound = false;
      
        portList = CommPortIdentifier.getPortIdentifiers();

        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                if (portId.getName().equals(defaultPort)) {
                    System.out.println("Found port: "+defaultPort);
                    portFound = true;
                }
            }
        }
        if (!portFound) {
            System.out.println("port " + defaultPort + " not found.");
        }
       
        try {
            serialPort = (SerialPort) portId.open("Kartman Read Thread", 
2000);
        } catch (PortInUseException e) {}

        try {
            inputStream = serialPort.getInputStream();
            outputStream = serialPort.getOutputStream();
        } catch (IOException e) {}

        try {
            serialPort.addEventListener(this);
        } catch (TooManyListenersException e) {}

        serialPort.notifyOnDataAvailable(true);

        try {
            serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,
                           SerialPort.STOPBITS_2,
                           SerialPort.PARITY_NONE);
        } catch (UnsupportedCommOperationException e){}
        
    }

    public void serialEvent(SerialPortEvent event) {
        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
            break;

        case SerialPortEvent.DATA_AVAILABLE:
            byte[] readBuffer =new byte[25];
           
       
           int numBytes=0;
            try {
               
            while (inputStream.available() > 0) {
                numBytes = inputStream.read(readBuffer);
                System.out.println("String: "+ new 
String(readBuffer,0,numBytes));
                System.out.println("Anzahl der bytes: "+numBytes);
                ambh.newMessage(new String(readBuffer,0,numBytes));
                readBuffer = new byte[25];
            }
            if(ambh.isPacketComplete()){
                System.out.println("Complete packet? 
"+ambh.isPacketComplete());
                kbn.addErgebnis(ambh.getLastPacket());
                System.out.println("Letzte 
Nachricht:"+ambh.getLastPacket().getMessage());
            }
            } catch (IOException e) {System.out.println("Ups!");}

            break;
        }
    }
   
    public void simpleWrite(char c){
       
        try{               
           
            this.outputStream.write(c);
                           
        }catch ( IOException e ){
            e.printStackTrace();
        }           
    }
   
    public void disconnect(){
        serialPort.removeEventListener();
        serialPort.close();
        System.out.println(defaultPort+" is closed!");
    }
   
    public ArrayList<AmbPacket> getAmbArray(){
        return ambh.getPacketarr();
    }
    public void setKartbahnnutzung(Kartbahnnutzung kbn){
        this.kbn=kbn;
    }

}

I have got a button called which closes the connection.
Everything is ok, it is calling an method from kbn which calls
serialcon.disconnect();

But there is also the possibility that the kbn object closes the 
connection it self.
It uses the same function "serial.disconnect()". The function itself is 
startetd,
but it does not close the connection. Nothing els happens, no exception, 
no ...
The program stops, and else happens.
Is there a better way to close this connection???

regards

-- 
Mit freundlichen Gr??en

Andr? Geisler
http://www.kartmanager.de
support at kartmanager.de



From rithy8 at gmail.com  Mon May 14 12:16:39 2007
From: rithy8 at gmail.com (rithy roth)
Date: Mon, 14 May 2007 11:16:39 -0700
Subject: [Rxtx] please help on when read time out occurs
Message-ID: <79e2547b0705141116q6138850sdb937a6fe74b5eb3@mail.gmail.com>

Hi,

I've been looking for some doc regarding what enableReceiveTimeout() is
doing( which event is generated) when a read time out occurs. Also, I am not
sure myself what to do in my code when a timeout happens. Could someone
please
help?

Thanks

========================================

Here is a portion of my code:

After opening my serial port, I issued the following:
...
     try {
        sPort.enableReceiveTimeout(30);
    } catch (UnsupportedCommOperationException e) {
         throw new SerialConnectionException("Enable Receive Timeout not
supported");
    }
...

Then, on my read I just have a listener on event notification:

   public void serialEvent(SerialPortEvent e) {

    // Create a StringBuffer and int to receive input data.
    StringBuffer inputBuffer = new StringBuffer();
    int         newData = 0;

    // Determine type of event.
    switch (e.getEventType()) {

    // Read data until -1 is returned. If \r is received substitute
    // \n for correct newline handling.
    case SerialPortEvent.DATA_AVAILABLE:
           // System.out.println("data available");
        while (newData != -1) {
        try {
           newData = is.read();

           if (newData == -1) {
            break;
            }


            inputBuffer.append((char) newData);

        } catch (IOException ex) {
         System.err.println(ex);

            return;
        }
      }

        break;

    // If break event append BREAK RECEIVED message.
    case SerialPortEvent.BI:
       // messageAreaIn.append("\n--- BREAK RECEIVED ---\n");
             Utils.debugprint("\n--- BREAK RECEIVED ---\n");
    }
    }
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From info at haberkamp.com  Tue May 15 04:27:10 2007
From: info at haberkamp.com (Guido Haberkamp IT-Beratung)
Date: Tue, 15 May 2007 12:27:10 +0200
Subject: [Rxtx] CommPortIdentifier "hangs"
Message-ID: <46498AFE.7050307@haberkamp.com>

Hello,

I couldn't find a solution to my problem or even anybody else mentioning
this problem on the net, so I'm asking you all for help.

I'm trying to use rxtx2.1.7 But when I try to get the portId from
CommPortIdentifier.getPortIdentifier("COM1")
It takes 3min50sec for the method to return the value.
After that everything works fine.

Connecting via Hyperterminal to the same port shows no noticable delay


I'll include my code at the end of this posting

Thanks for your help.
Guido


Here some details to my programming environment:

Windows 2000 Prof.
IBM T23 with one built-in Comport ("COM1"),
another one via USB-Serial Adapter (ATEN, COM5 or COM8)
COM10-17 are assigned because of a VS Netcom Device that connects 8
Serial ports over one tcp/ip link

Eclipse 3.2.2
Java 1.5.0
rxtx-2.1-7r2


I'm new to Java programming in general and serial port communication in
particular, so I'd really appreciate  also some hints if I use rxtx
completely the wrong way.

at Captain.at there's a code example that iterates through all available
ports (including parallel ports), but that code gave me many strange
exceptions,
so I changed it to opening the required port directly.


Here's my code:

import gnu.io.CommPort;

import gnu.io.CommPortIdentifier;

import gnu.io.NoSuchPortException;

import gnu.io.PortInUseException;

import gnu.io.SerialPort;

import gnu.io.SerialPortEvent;

import gnu.io.SerialPortEventListener;

import gnu.io.UnsupportedCommOperationException;



import java.io.BufferedReader;

import java.io.FileDescriptor;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.util.Date;

import java.util.Enumeration;

import java.util.TooManyListenersException;

import java.util.prefs.Preferences;

import logic.Parser;



/**

 * TODO Add comment here

 * @author  $Author:  $

 * @version  $Revision:  $, $Date:  $ UTC

 */

public class SerialCommunicator implements SerialPortEventListener

{

    static CommPortIdentifier portId = null;

    static Enumeration portList = null;

    String appName = null;

    private int baudRate = 0;

    private String device = null;

//    InputStream in = null;

    BufferedReader in = null;

    private String lineRead = null;

    OutputStream out = null;

    private Parser parser = null;

    private String portName = null;

    private Preferences prefs = null;

    public Thread readerThread = null;

    private SerialPort serialPort = null;

    int timeout = 0;

    public Thread writerThread = null;



    public SerialCommunicator(Parser p, Preferences pr, String dev)

    {



        super();

        this.parser = p;

        this.prefs = pr;

        this.device = dev;

//        TODO: assertions p, pr, d != null

        Preferences node = prefs.node("General");

        this.timeout = node.getInt("timeout", 0);

        node = prefs.node(device);

        this.portName = node.get("portName", null);

        this.baudRate = node.getInt("baudRate", 0);

        this.appName = node.get("appName", null);



        System.out.println("Trying to connect to port "+portName);

        Date date = new Date();

        System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        if (foundPort(portName)){

            try {

                connect();

            } catch (Exception e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

            date = new Date();

            System.out.println("Connected to port "+portName);

            System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        }

        else {

            System.out.println("Could not connect");

        }

    }



    boolean foundPort (String port){

        boolean portFound = false;

        try {

//            portId = CommPortIdentifier.getPortIdentifier(port);

            portId = CommPortIdentifier.getPortIdentifier("COM5");

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        if ( portId.isCurrentlyOwned() )

        {

            System.out.println("Error: Port is currently in use");

        }

        else {

            portFound = true;

        }

        return portFound;

    }

    void connect () throws Exception

    {

        this.openPort(portName);

        this.setInputStream();

        this.setParameters();

    }

    void openPort (String port){



        try {

            serialPort = (SerialPort) portId.open(appName, timeout);

        } catch (PortInUseException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }



    void setInputStream (){

        try {

            this.in = new BufferedReader(new
InputStreamReader(this.serialPort.getInputStream()));

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        serialPort.notifyOnDataAvailable(true);

        try {

            serialPort.addEventListener(this);

        } catch (TooManyListenersException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }



    }





    void setParameters(){

        try {

            this.serialPort.setSerialPortParams(baudRate,
SerialPort.DATABITS_8, SerialPort.STOPBITS_1,

                    SerialPort.PARITY_NONE);

        } catch (UnsupportedCommOperationException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }











    public void serialEvent(SerialPortEvent event) {

        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:

            break;

        case SerialPortEvent.DATA_AVAILABLE:

            try {

                this.lineRead = this.in.readLine();

                System.out.println("Read: "+lineRead);

            }

            catch (IOException e) {}



            break;

        }

    }





}


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From murato at mobiliz.com.tr  Wed May 16 06:58:50 2007
From: murato at mobiliz.com.tr (Murat Ozdemir)
Date: Wed, 16 May 2007 15:58:50 +0300
Subject: [Rxtx] java.io.IOException: No error in nativeDrain
Message-ID: <E3BF513AF070D741AE92D4780D6813A314A2EE@mobilizdc.mobiliz.com.tr>

Hello all,
i'm using RXTX 2.1 with JSmsLib 2.1.0
 
When i'm trying to run that framework, i'm getting exceptions from RXTX
Library as;
 
java.io.IOException: No error in nativeDrain
at gnu.io.RXTXPort.nativeDrain(Native Method)
at gnu.io.RXTXPort$SerialOutputStream.flush(RXTXPort.java:1201)
at org.smslib.CSerialDriver.send(CSerialDriver.java:206)
at org.smslib.handler.CATHandler.sync(CATHandler.java:43)
at org.smslib.CService.connect(CService.java:539)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.doIt(ReadMessagesAsync.java:92)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.main(ReadMessagesAsync.java:140)
 
 
Also, 
when i've read the README for rxtxSerial.dll faced that;
 
Wed Mar  1 12:01:05 MST 2006
rxtxSerial.dll had to be recomopiled to link in missing native methods.
 
what should i do? How can i recompile the dll?
 
---------------
Murat OZDEMiR
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From Alec.Cawley at quantel.com  Thu May 17 06:14:45 2007
From: Alec.Cawley at quantel.com (Alec.Cawley@quantel.com)
Date: Thu, 17 May 2007 13:14:45 +0100
Subject: [Rxtx] Source or javadox for javax.comm API
Message-ID: <OFCB4EC68D.D9F23803-ON802572DE.004266E0-802572DE.00434257@Research.Quantel>

I want to access serial ports on Windows from Java. I get think I 
understand how to compile and run - put RXTXcomm.jar in my classpath, put 
the appropriate DLLs in the DLL search path. But what about me? How do I 
lean how to use it? There is no javax.comm in the api Javadoc with the 
JAVA SDK 6.1, and I can only find on-line javadoc for it. I would prefer 
not to be dependant on on-line resources *all* the time. Is there 
somewhere I can download javax.comm.java or a bundle of the Javadocs 
generated from it?

Alec Cawley

-- 
This e-mail is intended for the named addressees only. Its contents may be 
privileged or confidential and should be treated as such. If you are not 
an intended recipient please notify the sender immediately and then delete 
it;  do not copy, distribute, or take any action based on this e-mail. In 
the pursuit of its legitimate business activities and its conformance with 
relevant legislation, Quantel may access any e-mail (including 
attachments) it originates or receives, for potential scrutiny. 

Quantel is the trade name used by Quantel Holdings Limited and its 
subsidiaries.  Quantel Holdings Limited is registered in England & Wales. 
Registration No: 4004913 
Contact details for all Quantel Offices and Companies can be found on our 
website www.quantel.com or by writing to the holding company.
Registered address: Turnpike Road, Newbury, Berkshire, RG14 2NX, United 
Kingdom 


From h.mayer at inode.at  Sat May 19 10:01:39 2007
From: h.mayer at inode.at (Hannes Mayer)
Date: Sat, 19 May 2007 18:01:39 +0200
Subject: [Rxtx] RXTX hangs (100% cpu) when using USB-to-Serial converter
Message-ID: <464F1F63.4020302@inode.at>

Hi all!

I was testing my new USB-to-Serial converter with the
SimpleRead.java application, but it hangs with 100%
cpu.

I also have an own app, which sends a string and
tries to receive it. I use a null-modem - while sending
works (I can see the string with "cat /dev/ttyUSB0"),
the serialEvent is not fired and 100% cpu is the result.

Doing the same (sending a string and receiving) with
some C code works.

Has anyone see the same behaviour and is there a fix
somewhere ?

Thanks!
Cheers,
Hannes.


From h.mayer at inode.at  Sat May 19 12:36:57 2007
From: h.mayer at inode.at (Hannes Mayer)
Date: Sat, 19 May 2007 20:36:57 +0200
Subject: [Rxtx] RXTX hangs (100% cpu) when using USB-to-Serial converter
In-Reply-To: <464F1F63.4020302@inode.at>
References: <464F1F63.4020302@inode.at>
Message-ID: <464F43C9.2000003@inode.at>

Hannes Mayer wrote:
> Hi all!
> 
> I was testing my new USB-to-Serial converter with the
> SimpleRead.java application, but it hangs with 100%
> cpu.

Found the problem!
Removing
serialPort.notifyOnOutputEmpty(true);
resolves this issue.
It seems that the usbserial driver doesn't support this.

Cheers,
Hannes.




From lists at iDIAcomputing.com  Sun May 20 17:59:11 2007
From: lists at iDIAcomputing.com (George Dinwiddie)
Date: Sun, 20 May 2007 19:59:11 -0400
Subject: [Rxtx] Underlying input stream returned zero bytes
Message-ID: <4650E0CF.8040900@iDIAcomputing.com>

Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
has no data available, I get
java.io.IOException: Underlying input stream returned zero bytes
	at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)

This is using code that worked fine with Sun's javax.comm API (the old
2.0 version) until a JVM upgrade broke it.

Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
have a C compiler on this box.  As near as I can tell from reading the
Java source, this means the open() call didn't grab a file descriptor.

  - George

-- 
  ----------------------------------------------------------------------
   * George Dinwiddie *                      http://blog.gdinwiddie.com
   Software Development                    http://www.idiacomputing.com
   Consultant and Coach                    http://www.agilemaryland.org
  ----------------------------------------------------------------------



From tjarvi at qbang.org  Sun May 20 18:08:39 2007
From: tjarvi at qbang.org (Trent Jarvi)
Date: Sun, 20 May 2007 18:08:39 -0600 (MDT)
Subject: [Rxtx] Underlying input stream returned zero bytes
In-Reply-To: <4650E0CF.8040900@iDIAcomputing.com>
References: <4650E0CF.8040900@iDIAcomputing.com>
Message-ID: <Pine.LNX.4.61.0705201807470.918@www>

On Sun, 20 May 2007, George Dinwiddie wrote:

> Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
> has no data available, I get
> java.io.IOException: Underlying input stream returned zero bytes
> 	at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)
>
> This is using code that worked fine with Sun's javax.comm API (the old
> 2.0 version) until a JVM upgrade broke it.
>
> Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
> have a C compiler on this box.  As near as I can tell from reading the
> Java source, this means the open() call didn't grab a file descriptor.
>
>  - George
>
>

Hi George,

Perhaps changing the threshold and or timeout may result in the behavior 
you expect.

--
Trent Jarvi
tjarvi at qbang.org


From lists at iDIAcomputing.com  Sun May 20 18:51:25 2007
From: lists at iDIAcomputing.com (George Dinwiddie)
Date: Sun, 20 May 2007 20:51:25 -0400
Subject: [Rxtx] Underlying input stream returned zero bytes
In-Reply-To: <Pine.LNX.4.61.0705201807470.918@www>
References: <4650E0CF.8040900@iDIAcomputing.com>
	<Pine.LNX.4.61.0705201807470.918@www>
Message-ID: <4650ED0D.9000204@iDIAcomputing.com>

Trent Jarvi wrote:
> On Sun, 20 May 2007, George Dinwiddie wrote:
> 
>> Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
>> has no data available, I get
>> java.io.IOException: Underlying input stream returned zero bytes
>>     at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)
>>
>> This is using code that worked fine with Sun's javax.comm API (the old
>> 2.0 version) until a JVM upgrade broke it.
>>
>> Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
>> have a C compiler on this box.  As near as I can tell from reading the
>> Java source, this means the open() call didn't grab a file descriptor.
>>
>>  - George
>>
>>
> 
> Hi George,
> 
> Perhaps changing the threshold and or timeout may result in the behavior 
> you expect.

Thanks, Trent.  Any suggestions on values?

BTW, The javax.comm 2.0 library seems to enable the timeout when opened as:

   CommPortIdentifier portId =
       CommPortIdentifier.getPortIdentifier(
		serialPortParams.getPortName());
   int timeout = 60000;
   serialPort = (SerialPort) portId.open(processname,
					timeout);

When I
       serialPort.enableReceiveTimeout(timeout);
       serialPort.enableReceiveThreshold(1);
I don't seem to receive any characters.

  - George

-- 
  ----------------------------------------------------------------------
   * George Dinwiddie *                      http://blog.gdinwiddie.com
   Software Development                    http://www.idiacomputing.com
   Consultant and Coach                    http://www.agilemaryland.org
  ----------------------------------------------------------------------



From support at kartmanager.de  Mon May 14 08:43:08 2007
From: support at kartmanager.de (Andre Geisler)
Date: Mon, 14 May 2007 16:43:08 +0200
Subject: [Rxtx] Problem on closing Ports
Message-ID: <4648757C.8080601@kartmanager.de>

Hello,

i have got a small problem on closing serail ports.
The following class manages the my serials connection an
is handeled by an object calles kbn which lays in a java
swin gui:

public class Serial implements SerialPortEventListener{
   
    private static CommPortIdentifier portId;
    private static Enumeration          portList;
    private InputStream              inputStream;
    private OutputStream        outputStream;
    private SerialPort              serialPort;
    private AmbHandler ambh = new AmbHandler();
    private String              defaultPort = "/dev/ttyS0";
    private Kartbahnnutzung kbn;
   
    public Serial() {}
   
    public void connect(){
        boolean              portFound = false;
      
        portList = CommPortIdentifier.getPortIdentifiers();

        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                if (portId.getName().equals(defaultPort)) {
                    System.out.println("Found port: "+defaultPort);
                    portFound = true;
                }
            }
        }
        if (!portFound) {
            System.out.println("port " + defaultPort + " not found.");
        }
       
        try {
            serialPort = (SerialPort) portId.open("Kartman Read Thread", 
2000);
        } catch (PortInUseException e) {}

        try {
            inputStream = serialPort.getInputStream();
            outputStream = serialPort.getOutputStream();
        } catch (IOException e) {}

        try {
            serialPort.addEventListener(this);
        } catch (TooManyListenersException e) {}

        serialPort.notifyOnDataAvailable(true);

        try {
            serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,
                           SerialPort.STOPBITS_2,
                           SerialPort.PARITY_NONE);
        } catch (UnsupportedCommOperationException e){}
        
    }

    public void serialEvent(SerialPortEvent event) {
        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
            break;

        case SerialPortEvent.DATA_AVAILABLE:
            byte[] readBuffer =new byte[25];
           
       
           int numBytes=0;
            try {
               
            while (inputStream.available() > 0) {
                numBytes = inputStream.read(readBuffer);
                System.out.println("String: "+ new 
String(readBuffer,0,numBytes));
                System.out.println("Anzahl der bytes: "+numBytes);
                ambh.newMessage(new String(readBuffer,0,numBytes));
                readBuffer = new byte[25];
            }
            if(ambh.isPacketComplete()){
                System.out.println("Complete packet? 
"+ambh.isPacketComplete());
                kbn.addErgebnis(ambh.getLastPacket());
                System.out.println("Letzte 
Nachricht:"+ambh.getLastPacket().getMessage());
            }
            } catch (IOException e) {System.out.println("Ups!");}

            break;
        }
    }
   
    public void simpleWrite(char c){
       
        try{               
           
            this.outputStream.write(c);
                           
        }catch ( IOException e ){
            e.printStackTrace();
        }           
    }
   
    public void disconnect(){
        serialPort.removeEventListener();
        serialPort.close();
        System.out.println(defaultPort+" is closed!");
    }
   
    public ArrayList<AmbPacket> getAmbArray(){
        return ambh.getPacketarr();
    }
    public void setKartbahnnutzung(Kartbahnnutzung kbn){
        this.kbn=kbn;
    }

}

I have got a button called which closes the connection.
Everything is ok, it is calling an method from kbn which calls
serialcon.disconnect();

But there is also the possibility that the kbn object closes the 
connection it self.
It uses the same function "serial.disconnect()". The function itself is 
startetd,
but it does not close the connection. Nothing els happens, no exception, 
no ...
The program stops, and else happens.
Is there a better way to close this connection???

regards

-- 
Mit freundlichen Gr??en

Andr? Geisler
http://www.kartmanager.de
support at kartmanager.de



From rithy8 at gmail.com  Mon May 14 12:16:39 2007
From: rithy8 at gmail.com (rithy roth)
Date: Mon, 14 May 2007 11:16:39 -0700
Subject: [Rxtx] please help on when read time out occurs
Message-ID: <79e2547b0705141116q6138850sdb937a6fe74b5eb3@mail.gmail.com>

Hi,

I've been looking for some doc regarding what enableReceiveTimeout() is
doing( which event is generated) when a read time out occurs. Also, I am not
sure myself what to do in my code when a timeout happens. Could someone
please
help?

Thanks

========================================

Here is a portion of my code:

After opening my serial port, I issued the following:
...
     try {
        sPort.enableReceiveTimeout(30);
    } catch (UnsupportedCommOperationException e) {
         throw new SerialConnectionException("Enable Receive Timeout not
supported");
    }
...

Then, on my read I just have a listener on event notification:

   public void serialEvent(SerialPortEvent e) {

    // Create a StringBuffer and int to receive input data.
    StringBuffer inputBuffer = new StringBuffer();
    int         newData = 0;

    // Determine type of event.
    switch (e.getEventType()) {

    // Read data until -1 is returned. If \r is received substitute
    // \n for correct newline handling.
    case SerialPortEvent.DATA_AVAILABLE:
           // System.out.println("data available");
        while (newData != -1) {
        try {
           newData = is.read();

           if (newData == -1) {
            break;
            }


            inputBuffer.append((char) newData);

        } catch (IOException ex) {
         System.err.println(ex);

            return;
        }
      }

        break;

    // If break event append BREAK RECEIVED message.
    case SerialPortEvent.BI:
       // messageAreaIn.append("\n--- BREAK RECEIVED ---\n");
             Utils.debugprint("\n--- BREAK RECEIVED ---\n");
    }
    }
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From info at haberkamp.com  Tue May 15 04:27:10 2007
From: info at haberkamp.com (Guido Haberkamp IT-Beratung)
Date: Tue, 15 May 2007 12:27:10 +0200
Subject: [Rxtx] CommPortIdentifier "hangs"
Message-ID: <46498AFE.7050307@haberkamp.com>

Hello,

I couldn't find a solution to my problem or even anybody else mentioning
this problem on the net, so I'm asking you all for help.

I'm trying to use rxtx2.1.7 But when I try to get the portId from
CommPortIdentifier.getPortIdentifier("COM1")
It takes 3min50sec for the method to return the value.
After that everything works fine.

Connecting via Hyperterminal to the same port shows no noticable delay


I'll include my code at the end of this posting

Thanks for your help.
Guido


Here some details to my programming environment:

Windows 2000 Prof.
IBM T23 with one built-in Comport ("COM1"),
another one via USB-Serial Adapter (ATEN, COM5 or COM8)
COM10-17 are assigned because of a VS Netcom Device that connects 8
Serial ports over one tcp/ip link

Eclipse 3.2.2
Java 1.5.0
rxtx-2.1-7r2


I'm new to Java programming in general and serial port communication in
particular, so I'd really appreciate  also some hints if I use rxtx
completely the wrong way.

at Captain.at there's a code example that iterates through all available
ports (including parallel ports), but that code gave me many strange
exceptions,
so I changed it to opening the required port directly.


Here's my code:

import gnu.io.CommPort;

import gnu.io.CommPortIdentifier;

import gnu.io.NoSuchPortException;

import gnu.io.PortInUseException;

import gnu.io.SerialPort;

import gnu.io.SerialPortEvent;

import gnu.io.SerialPortEventListener;

import gnu.io.UnsupportedCommOperationException;



import java.io.BufferedReader;

import java.io.FileDescriptor;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.util.Date;

import java.util.Enumeration;

import java.util.TooManyListenersException;

import java.util.prefs.Preferences;

import logic.Parser;



/**

 * TODO Add comment here

 * @author  $Author:  $

 * @version  $Revision:  $, $Date:  $ UTC

 */

public class SerialCommunicator implements SerialPortEventListener

{

    static CommPortIdentifier portId = null;

    static Enumeration portList = null;

    String appName = null;

    private int baudRate = 0;

    private String device = null;

//    InputStream in = null;

    BufferedReader in = null;

    private String lineRead = null;

    OutputStream out = null;

    private Parser parser = null;

    private String portName = null;

    private Preferences prefs = null;

    public Thread readerThread = null;

    private SerialPort serialPort = null;

    int timeout = 0;

    public Thread writerThread = null;



    public SerialCommunicator(Parser p, Preferences pr, String dev)

    {



        super();

        this.parser = p;

        this.prefs = pr;

        this.device = dev;

//        TODO: assertions p, pr, d != null

        Preferences node = prefs.node("General");

        this.timeout = node.getInt("timeout", 0);

        node = prefs.node(device);

        this.portName = node.get("portName", null);

        this.baudRate = node.getInt("baudRate", 0);

        this.appName = node.get("appName", null);



        System.out.println("Trying to connect to port "+portName);

        Date date = new Date();

        System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        if (foundPort(portName)){

            try {

                connect();

            } catch (Exception e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

            date = new Date();

            System.out.println("Connected to port "+portName);

            System.out.println("at:
"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

        }

        else {

            System.out.println("Could not connect");

        }

    }



    boolean foundPort (String port){

        boolean portFound = false;

        try {

//            portId = CommPortIdentifier.getPortIdentifier(port);

            portId = CommPortIdentifier.getPortIdentifier("COM5");

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        if ( portId.isCurrentlyOwned() )

        {

            System.out.println("Error: Port is currently in use");

        }

        else {

            portFound = true;

        }

        return portFound;

    }

    void connect () throws Exception

    {

        this.openPort(portName);

        this.setInputStream();

        this.setParameters();

    }

    void openPort (String port){



        try {

            serialPort = (SerialPort) portId.open(appName, timeout);

        } catch (PortInUseException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }



    void setInputStream (){

        try {

            this.in = new BufferedReader(new
InputStreamReader(this.serialPort.getInputStream()));

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        serialPort.notifyOnDataAvailable(true);

        try {

            serialPort.addEventListener(this);

        } catch (TooManyListenersException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }



    }





    void setParameters(){

        try {

            this.serialPort.setSerialPortParams(baudRate,
SerialPort.DATABITS_8, SerialPort.STOPBITS_1,

                    SerialPort.PARITY_NONE);

        } catch (UnsupportedCommOperationException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }











    public void serialEvent(SerialPortEvent event) {

        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:

            break;

        case SerialPortEvent.DATA_AVAILABLE:

            try {

                this.lineRead = this.in.readLine();

                System.out.println("Read: "+lineRead);

            }

            catch (IOException e) {}



            break;

        }

    }





}


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From murato at mobiliz.com.tr  Wed May 16 06:58:50 2007
From: murato at mobiliz.com.tr (Murat Ozdemir)
Date: Wed, 16 May 2007 15:58:50 +0300
Subject: [Rxtx] java.io.IOException: No error in nativeDrain
Message-ID: <E3BF513AF070D741AE92D4780D6813A314A2EE@mobilizdc.mobiliz.com.tr>

Hello all,
i'm using RXTX 2.1 with JSmsLib 2.1.0
 
When i'm trying to run that framework, i'm getting exceptions from RXTX
Library as;
 
java.io.IOException: No error in nativeDrain
at gnu.io.RXTXPort.nativeDrain(Native Method)
at gnu.io.RXTXPort$SerialOutputStream.flush(RXTXPort.java:1201)
at org.smslib.CSerialDriver.send(CSerialDriver.java:206)
at org.smslib.handler.CATHandler.sync(CATHandler.java:43)
at org.smslib.CService.connect(CService.java:539)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.doIt(ReadMessagesAsync.java:92)
at
tr.com.mobiliz.commserver.blo.handler.serial.rs232.sms.examples.ReadMessages
Async.main(ReadMessagesAsync.java:140)
 
 
Also, 
when i've read the README for rxtxSerial.dll faced that;
 
Wed Mar  1 12:01:05 MST 2006
rxtxSerial.dll had to be recomopiled to link in missing native methods.
 
what should i do? How can i recompile the dll?
 
---------------
Murat OZDEMiR
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From Alec.Cawley at quantel.com  Thu May 17 06:14:45 2007
From: Alec.Cawley at quantel.com (Alec.Cawley@quantel.com)
Date: Thu, 17 May 2007 13:14:45 +0100
Subject: [Rxtx] Source or javadox for javax.comm API
Message-ID: <OFCB4EC68D.D9F23803-ON802572DE.004266E0-802572DE.00434257@Research.Quantel>

I want to access serial ports on Windows from Java. I get think I 
understand how to compile and run - put RXTXcomm.jar in my classpath, put 
the appropriate DLLs in the DLL search path. But what about me? How do I 
lean how to use it? There is no javax.comm in the api Javadoc with the 
JAVA SDK 6.1, and I can only find on-line javadoc for it. I would prefer 
not to be dependant on on-line resources *all* the time. Is there 
somewhere I can download javax.comm.java or a bundle of the Javadocs 
generated from it?

Alec Cawley

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From h.mayer at inode.at  Sat May 19 10:01:39 2007
From: h.mayer at inode.at (Hannes Mayer)
Date: Sat, 19 May 2007 18:01:39 +0200
Subject: [Rxtx] RXTX hangs (100% cpu) when using USB-to-Serial converter
Message-ID: <464F1F63.4020302@inode.at>

Hi all!

I was testing my new USB-to-Serial converter with the
SimpleRead.java application, but it hangs with 100%
cpu.

I also have an own app, which sends a string and
tries to receive it. I use a null-modem - while sending
works (I can see the string with "cat /dev/ttyUSB0"),
the serialEvent is not fired and 100% cpu is the result.

Doing the same (sending a string and receiving) with
some C code works.

Has anyone see the same behaviour and is there a fix
somewhere ?

Thanks!
Cheers,
Hannes.


From h.mayer at inode.at  Sat May 19 12:36:57 2007
From: h.mayer at inode.at (Hannes Mayer)
Date: Sat, 19 May 2007 20:36:57 +0200
Subject: [Rxtx] RXTX hangs (100% cpu) when using USB-to-Serial converter
In-Reply-To: <464F1F63.4020302@inode.at>
References: <464F1F63.4020302@inode.at>
Message-ID: <464F43C9.2000003@inode.at>

Hannes Mayer wrote:
> Hi all!
> 
> I was testing my new USB-to-Serial converter with the
> SimpleRead.java application, but it hangs with 100%
> cpu.

Found the problem!
Removing
serialPort.notifyOnOutputEmpty(true);
resolves this issue.
It seems that the usbserial driver doesn't support this.

Cheers,
Hannes.




From lists at iDIAcomputing.com  Sun May 20 17:59:11 2007
From: lists at iDIAcomputing.com (George Dinwiddie)
Date: Sun, 20 May 2007 19:59:11 -0400
Subject: [Rxtx] Underlying input stream returned zero bytes
Message-ID: <4650E0CF.8040900@iDIAcomputing.com>

Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
has no data available, I get
java.io.IOException: Underlying input stream returned zero bytes
	at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)

This is using code that worked fine with Sun's javax.comm API (the old
2.0 version) until a JVM upgrade broke it.

Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
have a C compiler on this box.  As near as I can tell from reading the
Java source, this means the open() call didn't grab a file descriptor.

  - George

-- 
  ----------------------------------------------------------------------
   * George Dinwiddie *                      http://blog.gdinwiddie.com
   Software Development                    http://www.idiacomputing.com
   Consultant and Coach                    http://www.agilemaryland.org
  ----------------------------------------------------------------------



From tjarvi at qbang.org  Sun May 20 18:08:39 2007
From: tjarvi at qbang.org (Trent Jarvi)
Date: Sun, 20 May 2007 18:08:39 -0600 (MDT)
Subject: [Rxtx] Underlying input stream returned zero bytes
In-Reply-To: <4650E0CF.8040900@iDIAcomputing.com>
References: <4650E0CF.8040900@iDIAcomputing.com>
Message-ID: <Pine.LNX.4.61.0705201807470.918@www>

On Sun, 20 May 2007, George Dinwiddie wrote:

> Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
> has no data available, I get
> java.io.IOException: Underlying input stream returned zero bytes
> 	at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)
>
> This is using code that worked fine with Sun's javax.comm API (the old
> 2.0 version) until a JVM upgrade broke it.
>
> Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
> have a C compiler on this box.  As near as I can tell from reading the
> Java source, this means the open() call didn't grab a file descriptor.
>
>  - George
>
>

Hi George,

Perhaps changing the threshold and or timeout may result in the behavior 
you expect.

--
Trent Jarvi
tjarvi at qbang.org


From lists at iDIAcomputing.com  Sun May 20 18:51:25 2007
From: lists at iDIAcomputing.com (George Dinwiddie)
Date: Sun, 20 May 2007 20:51:25 -0400
Subject: [Rxtx] Underlying input stream returned zero bytes
In-Reply-To: <Pine.LNX.4.61.0705201807470.918@www>
References: <4650E0CF.8040900@iDIAcomputing.com>
	<Pine.LNX.4.61.0705201807470.918@www>
Message-ID: <4650ED0D.9000204@iDIAcomputing.com>

Trent Jarvi wrote:
> On Sun, 20 May 2007, George Dinwiddie wrote:
> 
>> Uxing RXTX-2.1-7 on Windows XP Pro: when I try to read from a port which
>> has no data available, I get
>> java.io.IOException: Underlying input stream returned zero bytes
>>     at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)
>>
>> This is using code that worked fine with Sun's javax.comm API (the old
>> 2.0 version) until a JVM upgrade broke it.
>>
>> Any suggestions on what's wrong?  I'd dig into it deeper, but I don't
>> have a C compiler on this box.  As near as I can tell from reading the
>> Java source, this means the open() call didn't grab a file descriptor.
>>
>>  - George
>>
>>
> 
> Hi George,
> 
> Perhaps changing the threshold and or timeout may result in the behavior 
> you expect.

Thanks, Trent.  Any suggestions on values?

BTW, The javax.comm 2.0 library seems to enable the timeout when opened as:

   CommPortIdentifier portId =
       CommPortIdentifier.getPortIdentifier(
		serialPortParams.getPortName());
   int timeout = 60000;
   serialPort = (SerialPort) portId.open(processname,
					timeout);

When I
       serialPort.enableReceiveTimeout(timeout);
       serialPort.enableReceiveThreshold(1);
I don't seem to receive any characters.

  - George

-- 
  ----------------------------------------------------------------------
   * George Dinwiddie *                      http://blog.gdinwiddie.com
   Software Development                    http://www.idiacomputing.com
   Consultant and Coach                    http://www.agilemaryland.org
  ----------------------------------------------------------------------