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I need a serial port monitoring software that works on windows 7 64bit or GNU/Linux and supports at least RS-232. Bonus points are if it's free software or at least freeware. I just need to be able to see what goes in and what goes out of the port. At this time, I don't need any protocol deciphering or anything else complicated.

Any ideas on what could work?

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@Olli Thanks a lot! That fixes the GNU/Linux side of the problem. – AndrejaKo Feb 8 '11 at 12:18
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On Windows machines, I've always used HyperTerminal (hypertrm.exe) to monitor serial ports. For my 32-bit Vista install, I copied over hypertrm.exe and hypertrm.dll from my old XP install and it worked just fine.

I don't have a 64-bit Windows 7 install, so I can't check that it would work for you. So it might need XP compatibility mode or some other 32-bit mode to work.

This person got it to work on Windows 7 32-bit. Also on that site is a list of more HyperTerminal replacements for Windows 7, though it focuses much more on the other communication protocols done by HyperTerminal.

Several other HyperTerminal replacement ideas are listed here.

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Can hyperterminal show status of each pin on the port? – AndrejaKo Mar 5 '11 at 16:06
I don't have a setup handy to check it out, but I believe the status bar displays active pins CTS, DSR, etc. – yhw42 Mar 5 '11 at 16:20
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