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From: kieffer@UNCAEDU.BITNET
Newsgroups: comp.os.vms
Subject: serial interface control signals
Message-ID: <870624100104.1bf@UcEdu.UNCA.AdhocNet.CA>
Date: Wed, 24-Jun-87 12:00:55 EDT
Article-I.D.: UcEdu.870624100104.1bf
Posted: Wed Jun 24 12:00:55 1987
Date-Received: Sat, 27-Jun-87 04:32:55 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Distribution: world
Organization: The ARPA Internet
Lines: 18

we  are running several Vax systems under VMS, each is connected to
a Develnet dataswitch via RS232 connections.
We noticed that the Vaxes are playing with the DTR lines when the
connection is idle, ie no session in effect over a specific port.
However, everytime DTR is cycled the network thinks
that the computer is trying to establish an outgoing call (with kermit
for example) but since there is no activity, the network eventually times out.
The only real inconvenience is the fact that the event is logged on
the network console printer and we go through boxes of paper every week.
(the cycle lasts about 30 seconds).
The device is a DZ, but it has happened on other models too. It does not
seem to happen under Unix, God only knows why.

Is there any way to stop this yo-yo behaviour?
 Rom Kieffer
 University of Calgary
 Alberta
 Canada