Here is a section of a hex log file between my pic and some ham radio control software. I have been using it to monitor the RS232 link between my WIN XP PC and a 18F4520, very handy while I was writing a bootloader. It gives timing and error/timeout info, so you can see how long it takes the pic to respond to the incoming data. You can set it to display the data in ascii or hex etc, and view the data live and save the data as a log file. You don't need any special cables, it just monitors the data to and from the port. It allows you to monitor any RS232 com port, even if it is a USB to RS232 converter cable, I think it can also monitor a printer port. I have been using PortMon.exe avaliable at
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