On Wed, Dec 17, 2008 at 4:34 AM, Bob Ammerman <rammerman@verizon.net> wrote:
> Does anyone know of a freeware and/or open source program for analyzing
> serial communications?
>
> What I am looking for is a program that uses the RX line on two separate
> serial ports and a special 'tap' cable to monitor both the RX and TX lines
> of a standard serial port. I want to be able to view the communication in
> hex, preferably with byte-by-byte timestamps. Extra points if the software
> can save an interaction to disk and reload it to view later.
>
> Thanks,
>
> -- Bob Ammerman
> RAm Systems


Check out RealTerm:
http://realterm.sourceforge.net/

It works pretty well. It has a "spy mode" but you have to pay for the
drivers to do that.
The last time I wanted to spy on a serial line I used a multi-port USB
to RS232 adapter with which I could simultaneously capture the RX and
TX lines of the "target" device. It worked well enough for me (and was
free)

-
ML
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