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Hi Peter,
I used to test comms cables by this method.
This may not work with USB convertors though.
In Xp goto AllPrograms\accessories\comminicati ons and load up Hyperterminal.
Once you told it which comms port you are using you should be able to short pins 2 and 3 (Tx/Rx) together and get an echo back to hyperterm, when you are typing.
Further thoughts -- If you find the original cable works but your new one doesn't, then you need to create a null modem cable.
On the DB9 connector
connect pins 7 and 8 together ( RTS to CTS)
and connect pins 1,4, and 6 together (DCD, DTR and DSR)
Try 7 and 8 together first, you may get lucky.
Hope this helps
Bill D
Last edited by billdan; 30-05-2012 at 05:35 PM.
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