Quote:
How can I tell if the cable I'm using is correct?

With a continuity tester on the proper pins.

You need pins 2, 3, and 5 connected. With 2 and 3 "crossed", and 5 straight through.

Another option, just in case your cable happens to be a straight-through cable instead of a null modem cable, is to deliberately use a docking sled so that the pins are already crossed for you.
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Tony Fabris