Subject: Re: pinouts for null modem
From: Rubywand <[email-masked]>
Date: Sun, 24 Aug 1997 12:47:13 +0000
Newsgroups: comp.sys.apple2

Bill Misek writes ...
 
>
> .... 
> So what pins from each of those gets wired together?
>

     You plug a 9-pin --> 25-pin converter cable into the PC serial port 
you plan to use. The 25-pin side should be a male plug (to go to a 
modem).

     Your GS ("high-speed") modem cable should, also end in a 25-pin male 
plug.

     Your NULL modem is two 25-pin female sockets (call them "A" and "B") 
wired back-to-back as follows ...

Socket-A  Socket-B

 1      -> 1
 2      -> 3
 3      -> 2
 4 & 5  -> 8
 6 & 22 -> 20
 7      -> 7
 8      -> 4 & 5
20      -> 6 & 22

     If you can find a couple old-style DIN-25 plug casings, the sockets 
can be mounted and the casings can be glue-gunned together to make a nice 
compact unit.

     You plug the modem cable from the PC into one side of the NULL modem 
and the modem cable from the GS into the other side.

Rubywand