Here is some information previously posted by others in response to similar
questions.

The best way to do it is to use the MSComm control that comes with Visual
Basic. If you want to see how this works, load and single step through the
VBTerm sample that comes with it (should be in the \samples subdirectory; if
not, I think you can download it from Microsoft's Visual Basic site).

One important note, though, is that you must know the syntax of the commands
to your meter (or other device), as sent via RS-232. Once you know those
you can simply modify the VBTerm code to suit your own purposes. It's
complex at first, but stick with it!


"Poor Man's Serial Instant Messenger"
http://www.htservices.com/Tools/Visu...unications.htm
Visual Basic Serial Communications Example Tutorials Source Code Programs


http://www.cpcug.org/user/clemenzi/t...s/SerialIO.htm
Serial I/O (RS232)



http://www.allapi.net/vbexamples/lis...ategory=SOURCE

Regards,
Tom Ogilvy

"John Gittins" wrote in message
...
How do I write and receive data from RS232? Does XP cause any problems in
this?

--
John Gittins
Production Engineer
SRC Automotive
4431 West Calhoun
Springfield
MO 65810
Phone 417 829 2411
Fax 417 829 2427