RS232 Sniffing

[amgen]

this simple circuit worked with PIC serial TTL to USB for send/rcv to PC. Just used a second USB to serial converter and actually used a 1K ohm R, then can view both sending and receiving. Open another instance of hyper-term or other terminal program. You could add 3rd USB/serial device and open another terminal prog and see separate send rcv windows

[Ioannis]

Thanks amgen.

My preference is to use a software solution than to use an extra serial port.

Ioannis

[tumbleweed]

Try com0com (and some of its associated programs like hub4com). It lets you create virtual ports from a single com port.

https://com0com.sourceforge.net/

[Ioannis]

Nice project this com0com. Will use them in Com to TCP/IP.

But for now I wanted to monitor a real device communicationg with the PC app.

Thanks,

Ioannis

[tumbleweed]

It should do that too.

Hub4com let's you create multiple virtual ports, so you can pipe one real port out to multiple apps

[Ioannis]

Thanks a lot for the suggestions and links.

Ioannis