Roland wrote:

> You can use one com port on the PC with a T junction made with 3 x D9's, a
> resistor and a diode. The PC will display the two way traffic. no diagnostics
> 
> It's somewhere at this site;
> http://www.airborn.com.au/serial/rs232.html

Neat :)  

Even though they are correct in that most so-called full-duplex protocols
actually work half-duplex, this probably won't work well with most
half-duplex protocols that use software handshake like XON/XOFF.

Gerhard
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