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From: wtm@neoucom.UUCP (Bill Mayhew)
Newsgroups: comp.dcom.modems
Subject: Re: TB 2500 query
Summary: S register to reset defaults on loss of DTR signal
Message-ID: <1808@neoucom.UUCP>
Date: 15 Oct 89 13:26:01 GMT
References: <4946@orca.WV.TEK.COM>
Organization: Northeastern Ohio Universities College of Medicine
Lines: 25


One way to force the T1000 (and should work on the T2500 too) is to
set S52=2.  According to the manual, setting 2 does this:  "The
modem disconnects and reloads operating parameters if DTR is
dropped, and will not auto-answer if DTR is not present."

If using a Unix mahcine, be sure pin 20 (the DTR lead) is connected
through from the host to the modem.  Usually, you can get DTR to
drop by killing the getty for the port and letting the getty
respawn.

I use S52=2 on my Unix PC.  When somebody has been using kermit,
when kermit exits, there is no getty running so DTR drops.  Init
respawns the getty, raising DTR and causing the default parameters
to reload.  I've never had any problems with l'users leaving the
modem in a wierd state.  I used to have a hayes compatible modem,
and people would customarily leave the modem in a goofy state,
locking out uucp.

This is definitely one of my favorite features of the TB modem.
One is out of luck though if the host can't toggle the DTR lead.
In that case, you might have to experiment cross-wiring the RTS
lead to 20 or something.

Bill