Can anyone recommend any good Com port monitor tools, like Portmon, which also work on Windows x64? Ideally something open source / freeware would be good.
The only one I have found for x64 is "Advanced Serial Port Monitor," which is really quite good. Not free, priced at $60 USD for a single user license. There is a 15-day trial. Honestly, I've been hoping (for quite a while now) that Mark R. would release a 64-bit version of portmon.
Old question, but very relevant. While serial ports may be gone from consumer devices these days, it is still very much used in industrial hardware, point of sale hardware, radios, etc. In my case I was trying to capture a communications session from a configuration software tool for some hardware equipment.
In the end I found a commercial app from Eltima Software called Serial Port Monitor which did the trick for me on Windows 7 x64.
来源：https://stackoverflow.com/questions/1674553/serial-com-port-monitor-for-windows-x64