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