Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!lll-winken!ubvax!vix From: vix@ubvax.UB.Com (Paul Vixie) Newsgroups: comp.dcom.modems Subject: Re: Absolutly hanging up a modem Message-ID: <3041@ubvax.UB.Com> Date: Wed, 21-Oct-87 00:34:39 EDT Article-I.D.: ubvax.3041 Posted: Wed Oct 21 00:34:39 1987 Date-Received: Fri, 23-Oct-87 06:01:07 EDT References: <1548@bloom-beacon.MIT.EDU> <3234@hoptoad.uucp> Reply-To: vix@ubvax.UUCP (Paul Vixie) Organization: Vixie Enterprises Lines: 21 Summary: anchor-signalman-mark-XII doesn't do this In article <3234@hoptoad.uucp> pozar@hoptoad.UUCP (Tim Pozar) writes: >In article <1548@bloom-beacon.MIT.EDU> xev@hstbme.mit.edu (Xev Gittler) writes: >>I have a hayes COMPAT modem on a tty line [...] need to make sure that [...] >>the line is definitely hung up. What can I do to accomplish this? > Drop DTR. Some modems which are advertised as "Hayes compat" do not do this. The Anchor-Signalman-Mark-XII is one example -- I bought three of them for indial at one place I worked, since they were the first $250/1200-baud modems I'd ever seen. Lack of attention to DTR wasn't hard to fix -- I had a local techie put little reed relays, keyed by DTR, controlling the main power (12VDC) on the modem. <> Another so-said Haye compat modem didn't want to reset the echo/verbose/etc flags to the switched/saved values on DTR transitions. Too bad there's no IEEE spec for Hayes compatibility... :-) -- Paul Vixie Consultant Work: 408-562-7798 vix@ubvax.ub.com Ungermann-Bass Home: 415-647-7023 ames!pyramid!ubvax!vix Santa Clara, CA <>