I made a program that does this.  It requires 3 com ports and a 'Y' cable
though, as it is designed to monitor both data directions.  The Y cable is
basically a straight through cable (used for your PC to PIC connection) with
the transmit and receive tapped off going to 2 seperate DB9 receive pins.
The software is written in VB and gets the data from the com ports and
displays it in ASCII and in Hex with a label so you know what port it came
from and the order it was transmitted/received.  The software is a bit rough
around the edges as I just slapped it together one day, but it works.  Email
me if interested.

mike@g-forcemotorsports.com



-----------------------------------------
                 Mike Montalvo
          G-FORCE Motorsports
http://www.g-forcemotorsports.com
                516-794-0858