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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.

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closed as off-topic by Cristian Ciupitu, EEAA, Tom O'Connor Sep 18 '14 at 22:28

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up vote 2 down vote accepted

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.

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You could check if Portmon still works. I'm legacy-free here, so I can't test it myself ;).

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It's a nice tool but not quite what I'm looking for. – TimothyP Jun 2 '09 at 2:56
    
and it doesn't work in 64-bit environment…. the great plus that it is free... – Jack Fosters Oct 16 '15 at 14:55

It appears that the everpresent Mark Russinovich has crafted such a tool, called Portmon.

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