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Path: utzoo!linus!vaxine!ptw
From: ptw@vaxine.UUCP (P. T. Withington)
Newsgroups: net.dcom
Subject: Re: Wanted: info on EIA RS-232 - (nf)
Message-ID: <367@vaxine.UUCP>
Date: Tue, 25-Oct-83 08:16:45 EDT
Article-I.D.: vaxine.367
Posted: Tue Oct 25 08:16:45 1983
Date-Received: Tue, 25-Oct-83 23:46:50 EDT
References: <348@umn-cs.UUCP>
Organization: Automatix Inc., Billerica, MA
Lines: 28

This is the closest thing I've ever seen to a "universal" RS-232 cable:

   (Computer End)                                (Terminal End)
Shield  1-----------------------------------------------1
XMT     2---------------------\ /-----------------------2
			       X <=======================(makes a null modem)
RCV     3---------------------/ \-----------------------3
RTS     4----+                                     +----4
	     |                                     |
CTS     5----+                                     +----5

DSR     6----+                                     +----6
GND     7----)-------------------------------------)----7
CD      8----o----------------\ /..................o----8
			       X
DTR    20...................../ \----------------------20

If you leave out the "..." line, short 8 to 20 at the terminal end (losing the
the ability of your terminal to tell if your computer is there, which few do
anyways).  This cable can thus be implemented with a four-wire shielded wire,
or phone wire if you don't believe in shielding (which is sometimes a loss).

Someone out there is marketing an "automatic" black box, which purports to
instantly connect two RS-232 devices.  I've ordered one, but haven't seen it,
and don't remember off hand who it is.

			     't`   --Tucker (ptw@vaxine.UUCP)
			      ~