> On Wed, May 08, 2002 at 06:36:47PM +0100, Mel wrote:
> > hmm, as I asked Kevin (accidently offlist), how can I tell if
> it's a null
> > cable or not?
>> Either you get lucky and have it written on the cable, or you get a
> multi-meter and see if pins 3 & 4 are swapped (from memory - and it's
> flaky memory.)
It's pins 2 and 3.
However, the standards for 9-way and 25-way connectors have the
opposite meanings, so a straight through cable has pin 2 on the
9-way connected to pin 3 on the 25-way, while a null modem
(or crossover cable) has pin 2 on both ends connected together,
and pin 3 on both ends connected.
Real simple, this RS232 stuff :-)
Later,
Kenn
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