Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!zephyr.ens.tek.com!tektronix!sequent!scottie
From: scottie@sequent.UUCP (Scott Thurston)
Newsgroups: comp.sys.sequent
Subject: Re: naive question about tty ports
Message-ID: <50708@sequent.UUCP>
Date: 16 Jan 91 16:05:43 GMT
References: <14@mcglin.wpg.com>
Reply-To: scottie@crg8.UUCP (Scott Thurston (ex-zoomie))
Organization: Sequent Computer Systems, Inc
Lines: 23

In article <14@mcglin.wpg.com> julia@mcglin.wpg.com (Julia Crawley) writes:
%In the next few weeks, my organization will be getting a Basic 4 
%GPX 6270 (i.e., a Sequent).  Our vendor is telling us that proper
%cabling of our in-house terminals will require four pairs?  Is this 
%true?  Or, will three wires for 2,3,&7 be sufficient?  
%
%-- 
%Julia Crawley -- (504) 586-1200
%julia@mcglin.wpg.com  
%uunet!wpg!mcglin!julia

You will need a signal driving DCD (pin 8) on the Sequent side of the 
connection.  If DCD is not high when an open is attempted on the port, the
open will not complete.  Commonly, DTR (pin 20) on the terminal is used to
drive DCD on the Sequent.  Then, when the terminal is shut off, DCD is
dropped and the port is closed and a HANGUP sent to processes associated
with the port.

-- Scott Thurston			UUCP: ...!uunet!sequent!scottie
   Technical Support Engineer           Internet: scottie@sequent.com
   Sequent Computer Systems, Inc	(503) 578-3878
   15450 SW Koll Parkway
   Beaverton, OR  97006