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From: STEINBERGER@KL.SRI.COM.UUCP
Newsgroups: comp.os.vms
Subject: DTR on DHV11 boards
Message-ID: <12306082085.32.STEINBERGER@KL.SRI.Com>
Date: Thu, 28-May-87 19:27:52 EDT
Article-I.D.: KL.12306082085.32.STEINBERGER
Posted: Thu May 28 19:27:52 1987
Date-Received: Sat, 30-May-87 05:53:30 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Distribution: world
Organization: The ARPA Internet
Lines: 18

I've recently hooked up a modem (Microcom, 9600 baud) to a port of a DHV11
board on a uVAX II.  The DTR indicator light on the modem stays on for
5 - 10 secs then goes off briefly (a few seconds) then comes back on and
the cycle repeats.  Apparently the modem won't answer incoming calls
when the DTR signal is absent.  Has anyone else noticed this?  Does this
reflect the way DEC designed the driver for that board?  It would be nice,
I think, to have the DTR signal not oscillate.  Is there an appropriate
software setting to change this, or some other software fix?  I think
the DTR should be asserted until the connection is broken (by logging
off), then the VAX toggle the DTR line to tell the modem to hangup.
Any suggestions or similar experiences?  Thanks to all who respond.


-Ric Steinberger
steinberger@kl.sri.com


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