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From: EVANS@RADC-TOPS20.ARPA
Newsgroups: net.micro
Subject: Re: TRS-80 Model II RS232(C) interface
Message-ID: <15650@sri-arpa.UUCP>
Date: Tue, 17-Jan-84 13:06:25 EST
Article-I.D.: sri-arpa.15650
Posted: Tue Jan 17 13:06:25 1984
Date-Received: Fri, 20-Jan-84 06:07:13 EST
Lines: 30


Port B on the Model II portion of my Model 16 supports the
following signals:

           	             PIN#
           	             ----
   GROUND		     1,7
   DATA SET READY	       6
   CLEAR TO SEND	       5
   CARRIER DETECT	       8
   TRANSMIT DATA	       2
   REQUEST TO SEND	       4
   DATA TERMINAL READY        20

If the printer does not support:

   CTS then connect pins 5 and 20.
   DSR then connect pins 6 and 20.

I'm sure you are aware that if no device is attached to port A
(assuming the printer is on B) you must put a terminator plug
on it.  RS sells them for about $30 last I checked, or you can
make your own by connecting pins 3, 5, 6, 7, and 8 together on
a regular DB-25 connector.

Hope this helps,

Rich Evans
(EVANS@RADC-TOPS20)
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