Path: utzoo!mnetor!uunet!cbmvax!rutgers!sri-spam!ames!lll-lcc!lll-winken!csustan!polyslo!nkhan
From: nkhan@polyslo.UUCP (Randy Casey)
Newsgroups: comp.sys.amiga
Subject: Re: Serial
Message-ID: <945@polyslo.UUCP>
Date: 6 Jan 88 18:27:11 GMT
References: <2287@crash.cts.com>
Reply-To: nkhan@polyslo.UUCP (Randy Casey)
Organization: Cal Poly State Univ,CSC Dept,San Luis Obispo,CA 93407
Lines: 46
Keywords: Serial, null modem, rs-232
Summary: Pin Connections for a null modem cable.

In article <2287@crash.cts.com> amiguy@pnet01.cts.com (Sean Wolfe) writes:
>This is a Help me question for the hardware wizzes.
>
>Ok, I bought a used RS232 terminal capaible from 50 to 19.5Kbaud, great.
>Now, I need to know how to make a null modem cable.
>Of course my standard Amy to Modem cable doesn't work...
>The Terminal is standard:
>1  Frame Gnd.              2 Transmit Data Output
>3  Rec. Data Input         4 Request to send out.
>5  Clear to send input     6 Data Set Ready Inp. (opt.)
>7  Sig. Gnd.               8 Carrier Dectect Input
>20 Data Term. Ready Output 9 20 mA ...
>14 20 Ma...               10 Detected Current Loop data
>25 Current Loop + transmit 13  Current Loop - transmitt
>12 Current Loop + reveice  24  Current Loop - Receive
>  Sean

	The correct Pin connections for a Null-Modem cable are as follows:

			Computer		Terminal
			--------		--------
		Pin #	1			1
		Pin #	2			3
		Pin #	3			2
		Pin #	4			5
		Pin #	5			4
		Pin #	6,20 (*)		8
		Pin #	7			7
		Pin #	8			6,20 (*)

		(*) For these pins jumper pins 6 and 20 on the same connector
		    together and then run from pin 6 to pin 8.

	If this is for a Amiga 1000 MAKE SURE pins 14, 21, and 23 on the
amiga serial cable are disconnected!  You can fry the terminal, the Amiga
or BOTH if these power leads get shorted.

	This has worked for anything I have ever needed to connect but if you
 still have problems Mail me at the address below.

                                              Randy

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