I'm looking for the Wireshark of Serial Port monitoring. I'd prefer free/open-source software, but am willing to look at commercial solutions if the price is reasonable.
It needs to be compatible with Windows Vista/7 and will be used to monitor all data traffic between two com ports on the same computer.
You could check if Portmon still works. I'm legacy-free here, so I can't test it myself ;).
It appears that the everpresent Mark Russinovich has crafted such a tool, called Portmon.
I have used the Free Serial Port Monitor, by HHD Software, to monitor communications with an old magnetic card reader.
They also have a paid version if you prefer.
