I like REALTERM. The display can do ASCI, hex, or both, plus you can 
program a string easily and click once to send, and see what comes back 
on the screen above. I run XP SR2 and WINME, but sure is worth the try.

http://realterm.sourceforge.net/

Rich wrote:
> What is the best RS232 communications software (Full/half duplex; programmable bits; start-stop; parity and baud rate) for communicating with MAX232A , and that will run on Vista and Windows 7?  
>   
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