[Rxtx] loopback puzzle

[Joachim Buechse]

You are not by any chance using the cu.modem port?

On 06.09.2006, at 15:26, Dr. Stephen Judd wrote:

> I am trying to understand basic things about serial ports on the Mac.
> The SerialDemo.java program from Sun's javax.CommPort program
> displays 2 panels: characters going out to a port, and characters
> coming in from it. Question: if I have nothing attached to the port,
> why does anything get echoed from the outgoing panel to the incoming
> one? My mental model says nothing should happen until there is
> some hardware attached to the port.
>
> Nothing I have looked for in the code tells me there is any software
> connection between the outgoing and incoming streams.
> Please tell me what is broken in my brain.
> sj
>
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