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From: wtm@neoucom.UUCP (Bill Mayhew)
Newsgroups: net.micro.pc
Subject: Re: Need pinouts for IBM PC[AT] serial/parallel
Message-ID: <280@neoucom.UUCP>
Date: Tue, 23-Sep-86 08:47:38 EDT
Article-I.D.: neoucom.280
Posted: Tue Sep 23 08:47:38 1986
Date-Received: Wed, 24-Sep-86 01:01:50 EDT
References: <511@bucsb.bu.edu.UUCP>
Organization: Northeastern Ohio Universities College of Medicine
Lines: 31
Summary: Here they are...

### Hi line eater ###

Here's what I've been using for the AT-compatible 9 pin
connector.  By the way, the arrangment seems to be the
same as the 9 pin connectors on newer DEC terminals.  This
message is uploading through an RS232 line from an AT.

Pin     Name       Function     Direction
---     ----       --------     ---------
 1	CD	Carrier Detect	From modem to computer
 2	RxD	Received Data	From modem to computer
 3	TxD	Transmit Data	From computer to modem
 4	DTR	Data Term Ready	From computer to modem
 5	Gnd	Ground		mutual signal return line
 6	DSR	Data Set Ready	From modem to computer
 7	RTS	Ready To Send	From computer to modem
 8	CTS	Clear To Send	From modem to computer
 9	RI	Ring Indicator	From modem to computer

Depending on the applications program that you are using, you
will need to connect various numbers of these pins to the
device to which you want to talk.  I'm using "Mirror" which lets me
get away with only using 2, 3, and 5.

  --Bill

Bill Mayhew
Division of Basic Medical Sciences
Northeastern Ohio Universities' College of Medicine
Rootstown, OH  44272   USA    (216) 325-2511
(wtm@neoucom.UUCP)