How do you capture Serial (COM) communications?

If the answer is still actual:

COM port sniffer for Windows - http://www.eltima.com/products/serial-port-monitor/

You can't capture traffic of a COM port (serial Port) on Windows with Wireshark, as the capturing library (WinPcap) does not support this.

What you need is a COM port sniffer for Windows. Please google that. You will find tools like these:

http://www.serial-port-monitor.com/
http://technet.microsoft.com/en-us/sysinternals/bb896644.aspx

BTW: There seems to be a way to capture serial port traffic with Wireshark and named pipes. However, you would need a helper tool.

http://www.wireshark.org/lists/wireshark-dev/201003//msg00020.html

I think it's easier to go for the COM port sniffers I mentioned first.

Regards
Kurt

This is a great product I've been using for years if you haven't already seen it http://www.stratusengineering.com/product/ez-tap-pro/

I capture any serial data with the software - http://www.eltima.com/products/serial-port-monitor/