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Article #1526Mac Serial Port pinout
From: Craig Lund
Date: Mon, 27 May 1985 16:22
Date: Mon, 27 May 1985 16:22
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1241 bytes
Somebody out there asked for the pinout of the serial port on the back of a Macintosh. The serial port is RS422, NOT RS-232 ! If you wire it right, most RS-232 devices won't care. Pinout: 1 Ground 2 +5 3 Ground 4 Transmit Data + 5 Transmit Data - 6 +12 7 Incoming handshake 8 Receive Data + 9 Receive Data - I connected directly to my UNIX box using the following three-wire connection: MAC Pin UNIX Pin 1 7 5 2 9 3 If this does not work for you, try switching pins 2 and 3 on the UNIX side. Also, some RS-232 ports will require connecting ground and/or +5 to some of the RS-232 control lines. Consult the manual for your RS-232-based computer or modem.
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site x.UUCP Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!bonnie!akgua!mcnc!decvax!genrad!mit-eddie!cybvax0!frog!x!craig From: craig@x.UUCP (Craig Lund) Newsgroups: net.micro.mac Subject: Mac Serial Port pinout Message-ID: <517@x.UUCP> Date: Mon, 27-May-85 12:22:36 EDT Article-I.D.: x.517 Posted: Mon May 27 12:22:36 1985 Date-Received: Thu, 30-May-85 03:39:17 EDT Distribution: net Organization: Charles River Data Systems, Framingham MA Lines: 31