Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!purdue!decwrl!labrea!polya!kaufman
From: kaufman@polya.Stanford.EDU (Marc T. Kaufman)
Newsgroups: comp.dcom.modems
Subject: Re: Solution to Problems with UUCP/modems.
Keywords: modems ACU driver
Message-ID: <4026@polya.Stanford.EDU>
Date: 22 Sep 88 00:32:44 GMT
References: <1260@moscom.UUCP> <324@mikros.systemware.de>
Reply-To: kaufman@polya.Stanford.EDU (Marc T. Kaufman)
Organization: Stanford University
Lines: 14

In article <324@mikros.systemware.de> stefan@mikros.UUCP (Stefan Stapelberg) writes:

>I would like to implement this scheme, but controlling the
>DTR signal from the modem turns out to be a problem: The modem
>doesn't answer rings if DTR has not been asserted by the opening
>process.  Unfortunately, I have to use DTR to hangup the modem
>after dialing out.

The Bell-compatible modem spec says that to hang up a modem, you drop DTR
and hold it down until CD goes away... but you do not have to hold it down
more than 250 milliseconds.  Can you just pulse DTR down (to hang up) then
back up?

Marc Kaufman (kaufman@polya.stanford.edu)