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From: brian@ut-sally.UUCP (Brian H. Powell)
Newsgroups: net.micro.mac
Subject: Re: DTR held high from program control?
Message-ID: <5691@ut-sally.UUCP>
Date: Mon, 8-Sep-86 13:41:56 EDT
Article-I.D.: ut-sally.5691
Posted: Mon Sep  8 13:41:56 1986
Date-Received: Mon, 8-Sep-86 20:34:28 EDT
References: <458@aecom.UUCP>
Distribution: net
Organization: U. Texas CS Dept., Austin, Texas
Lines: 21

In article <458@aecom.UUCP>, naftoli@aecom.UUCP (Robert N. Berlinger) writes:
> Is it true that DTR will only go high if the communications program
> tells it to?

     From IM Volume IV:
	"The Data Terminal Ready (DTR) line in the RS232 interface is now
	automatically asserted when the Serial Driver is opened; DTR is
	negated when it is closed."  (They're talking about the new SERD
	resources == 128K ROM version.)

     There are also _Control calls to assert and negate DTR:  (Issue them to
the output channel driver.)
	csCode = 17
	 This call asserts DTR.

	csCode = 18
	 This call negates DTR.
-----
Brian H. Powell
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