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From: fyl@ssc.UUCP (Phil Hughes)
Newsgroups: comp.unix.questions
Subject: Re: The DSR pin - what is it used for?
Message-ID: <751@ssc.UUCP>
Date: Thu, 27-Aug-87 20:18:39 EDT
Article-I.D.: ssc.751
Posted: Thu Aug 27 20:18:39 1987
Date-Received: Sun, 30-Aug-87 01:54:44 EDT
References: <304@pvab.UUCP>
Organization: SSC, Inc., Seattle, WA
Lines: 13
Summary: DSR is to DCE as DTR is to DTE

DSR, Data Set Ready is used to allow a DCE (modem, for example) to
tell a DTE (terminal or computer) that it (the DCE) is in an on-line
state.  This differs from the CD signal that says the modem is actually
connected to something.  In other words, a DTE would check the DSR
signal to determine if the modem is out there before dialing.

In a direct connect situation between two DTEs, you should just be
able to connect DTR to DSR.

-- 
Phil Hughes, SSC, Inc. P.O. Box 55549,       +----------------+
Seattle, WA 98155  (206)FOR-UNIX             | NO CONTRA AID! |
    ...!uw-beaver!tikal!ssc!fyl              +----------------+