Path: utzoo!attcan!uunet!peregrine!ccicpg!cci632!rit!tropix!moscom!ur-valhalla!uhura.cc.rochester.edu!rochester!pt.cs.cmu.edu!andrew.cmu.edu!pgc+
From: pgc+@andrew.cmu.edu (Paul G. Crumley)
Newsgroups: comp.sys.ibm.pc.rt
Subject: Re: Modem/Terminal Cables
Message-ID: <4Yagl0C00jaRA0TEhh@andrew.cmu.edu>
Date: 22 Jul 89 22:10:08 GMT
References: <5026@umd5.umd.edu>
Organization: Information Technology Center, Carnegie Mellon, Pittsburgh, PA
Lines: 60
In-Reply-To: <5026@umd5.umd.edu>


Brett,

I assume you meant to type 6294704 rather than 6294794.  If you really
want a 6294794 don't bother with this.  (BTW, the numbers you give are
option numbers, not part numbers.  I have found these are VERY different
in IBM llingo so be careful...  Asking for the right thing by the wrong
name can be a very exciting experience :-)  6294704 is part number
6298240 and 6298186 is part number 6298526.

6294704 is wired like this:

RT end (female)		Modem end (male)
name	pin		name	pin

TxD	1		TxD	2
DTR	2		DTR	20
RTS	3		RTS	4
RI	4		RI	22
	5		no connection
RxD	6		RxD	3
DSR	7		DSR	6
CTS	8		CTS	5
CD	9		CD	8
GND	10		GND	7
shield			shield	1



6298186 is wired like this:

RT end (female)		Terminal end (female)
name	pin		name	pin

TxD	1		RxD	3
DTR	2		DSR	6
RTS	3		CD	8
RI	4		no connection
	5		no connection
RxD	6		TxD	2
DSR	7		DTR	20
CTS	8		CD	8
CD	9		CTS	5
CD	9		RTS	4
GND	10		GND	7
shield			shield	1

Note:  RT end loops pins 3 & 8 and Terminal end loops pins 5 & 4.



Though you didn't ask, this information comes from "IBM RT Personal
Computer -- Planning Guide", GC23-0782.  Don't try to really use an RT
without one of these books.  It has all the important pin-outs, part
(and option) numbers, environment requirements, etc.


Best regards,

Paul