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From: root@zswamp.uucp (Geoffrey Welsh)
Newsgroups: comp.dcom.modems
Subject: Re: "Null Terminal" Cable.
Message-ID: <111.28432783@zswamp.uucp>
Date: 28 May 91 14:16:45 GMT
Organization: Izot's Swamp BBS (FidoNet), Kitchener, Ontario
Lines: 19

In a letter to All, Peter da Silva (peter@ficc.ferranti.com ) wrote:

 >A "full" null modem cable works DCE-DCE or DTE-DTE, and 
 >usually looks something like: 
 > 1-1 2-3 3-2 4-5 5-4 6-8+20 7-7 8+20-6.

   That's one approach to a null modem (feeding DTR back to DCD locally); I 
prefer to feed it to the *opposite* DCD, so each device senses carrier 
whenever the other is ready.

   However, for a DCE, pins 8 and 20 are both outputs; tying them together is 
definitely *not* robust under your pinouts or mine.
 

--  
Geoffrey Welsh - Operator, Izot's Swamp BBS (FidoNet 1:221/171)
root@zswamp.uucp or ..uunet!watmath!xenitec!zswamp!root
602-66 Mooregate Crescent, Kitchener, ON, N2M 5E6 Canada (519)741-9553
"He who claims to know everything can't possibly know much" -me