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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.
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Serial Monitor works by installing a filter driver on top of a serial device driver. A filter driver intercepts all I/O requests issued by application. There are control requests that configure port parameters as well as data transfer requests that pass data between application and serial device.
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.
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