Download the RS232 serial sniffer here: https://www.denfordata.com/downloads/dos/sniffer.zip
This is a rough and ready win32 program we wrote a while back, to debug and monitor RS232 communications.
You connect one port on the PC to the PC controlling the machine.
Then connect the other port to the machine itself
Configure the baud rate and settings and press start on each window.
Each window will show what has been received on each port. The software takes the data receieved on each port, and passes it on to the other port. We had no problems running it on a 600Mhz P3 at 19200 baud - and was reliable enough to capture some protocol timing issues.
There are a few bugs remaining as it did what we needed at the time and has not been touched since, hopefully someone else may find it useful.
RS232 serial data sniffer program
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