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From: jon@amc.UUCP (Jon Mandrell)
Newsgroups: comp.emacs
Subject: Re: What's wrong with flow control?
Message-ID: <260@amc.UUCP>
Date: Tue, 2-Dec-86 22:24:14 EST
Article-I.D.: amc.260
Posted: Tue Dec  2 22:24:14 1986
Date-Received: Sun, 7-Dec-86 02:16:36 EST
References: <8612011910.AA05601@icst-cmr.arpa.ARPA>
Reply-To: jon@amc.UUCP (Jon Mandrell)
Organization: Applied Microsystems Corp.; Redmond, Wa.
Lines: 16


  RTS and CTS are *not* used for flow control at the application level.
A DTE device sets RTS when it wishes to send something, which tells the
DCE device (a modem) that it should do whatever is necessary to be ready
to get some data.  Then the modem raises CTS indicating that the device
may send data.
  RS-232C is so misused by so many devices.  There is a whole set of
secondary channel signals defined for the DB-25 series of connectors
which can be usurped, without screwing up current modem connections.
I agree ^S/^Q was not a good choice, but the CTS/RTS or DSR/DTR pair
are no better.
-- 
Jon Mandrell    (ihnp4!uw-beaver!tikal!amc!jon)
Applied Microsystems Corp.

"flames >& /dev/null" - me