Path: utzoo!utgpu!water!watmath!onfcanim!dave
From: dave@onfcanim.UUCP (Dave Martindale)
Newsgroups: comp.dcom.modems
Subject: Re: dial in/out and modem state
Message-ID: <15573@onfcanim.UUCP>
Date: 7 Mar 88 05:08:18 GMT
References: <142@mccc.UUCP> <564@virginia.acc.virginia.edu> <10321@mimsy.UUCP> <178@jim.odr.oz> <10379@mimsy.UUCP> <15551@onfcanim.UUCP> <1678@van-bc.UUCP>
Reply-To: dave@onfcanim.UUCP (Dave Martindale)
Organization: National Film Board / Office national du film, Montreal
Lines: 22

In article <1678@van-bc.UUCP> sl@van-bc.UUCP (Stuart Lynne) writes:
>There is a work-around for this problem. 
>
>Set ats0=0&w. This tells the modem to never answer the modem. Then whenever
>you reset DTR you have a modem which won't answer the phone anymore.
>
>Now arrange to have your getty replacement (what you're still running factory
>standard!!) to send ats0=1 to prime the modem to answer the phone. This can
>be done for example with:

But normally getty's open hangs until carrier detect comes up.  In
order to send commands to the modem before that, you need to configure
the line or build the cable so that carrier detect is ignored - not a
good idea, since a user hanging up will not generate a hangup signal.
Or, if you have an alternate device that allows open without waiting
for carrier, you can use that - but this requires kernel mods.

My eventual solution was simple - we bought a Telebit Trailblazer, and
it is now our principal uucp modem - it works fine for both dialin and
dialout.  The backup modem is an older Vadic VA2400, which also works
fine for both dialin and dialout without handholding.  All of the Hayes
modems have now been relegated to dialin-only use.