Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mtndew!friedl
From: friedl@mtndew.Tustin.CA.US (Steve Friedl)
Newsgroups: comp.unix.sysv386
Subject: Re: Wiring terminals 300 ft. from the computer
Summary: Twisted pair for RS-232?
Message-ID: <521@mtndew.Tustin.CA.US>
Date: 21 Sep 90 05:15:32 GMT
References: <11774@bsu-cs.bsu.edu> <jeff.653752463@marichal.austin.ibm.com>
Organization: VSI*FAX Tech Ctr, Tustin, CA
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[ How to get long-distance RS-232 connections ]

Jeff Johnson writes:
> I would suggest using 8-wire shielded twisted-pair and make sure you
> ground the shielding and pick complimentary wires for the twisted-pairs.
> Unless you have a very noisy environment or poor line drivers, it should
> work. 

It was always my impression that twisted pairs were to be used
for differential circuits (like RS-422?) where the two wires were
electrically related or if one of them is a ground.

While (say) CTS and RTS are "related" if one is looking at a
datacomm protocol, electrically they have no relationship to each
other, and twisting these wires together won't have any kind of
meaningful benefit.

Am I missing something?

     Steve

-- 
Stephen J. Friedl, KA8CMY / I speak for me only / Tustin, CA / 3B2-kind-of-guy
+1 714 544 6561  / friedl@mtndew.Tustin.CA.US  / {uunet,attmail}!mtndew!friedl

Jesse Helms for U.S. Supreme Court Justice