Re: Connecting 2 e450s via serial port (fairly newbie-ish question)

From: Greg Andrews (gerg_at_panix.com)
Date: 07/29/03 

Date: Tue, 29 Jul 2003 17:03:07 +0000 (UTC)

"Dr. David Kirkby" <drkirkby@ntlworld.com> writes:
>
>I built such a cable from information at
>http://www.obsolyte.com/sunFAQ/serial/
>The 25-25 pin cable they suggest does indeed work. Apparently, not all
>null modem cables have all the connections, so that might be your
>problem.
>
>Note, I'm sure there is an error in the pinouts at that site for the
>9->25 pin cable. Pins 2 and 3 should be crossed. (I'm also sure I
>pointed this out to them, but it does not seem to have changed.)
>

No, a null-modem cable between a 9-pin and a 25-pin connector
does NOT cross over pins 2 and 3. That's because IBM reversed
the signals on pins 2 and 3 when they invented the 9-pin RS232
port. On the 9-pin connector, pin 2 is RxD (Receive Data), and
pin 3 is TxD (Transmit Data).

  -Greg 

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