On Thu, 11 Mar 2010 19:25:13 -0000, "James Holland" said:
 
> 
> I tend to use my Intronix USB Logic Analyser to investigate serial port
> comms problems. It has a 232 analyser built into the software and using a
> Logic Analyser allows the baud rate and signal polarity to be easily
> determined.
> 
> http://www.pctestinstruments.com/

I second that opinion. The nicest feature for me is the ability to see
both RX and TX lines at the same time, in sync, so you can see the back
and forth exchange. Plus you can use it on non-standard baud rates.

Cheerful regards,

Bob

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