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From: McGuire_Ed@GRINNELL.MAILNET
Newsgroups: mod.computers.vax
Subject: VMS dialout program
Message-ID: <8603190936.AA19772@ucbvax.berkeley.edu>
Date: Tue, 18-Mar-86 14:51:00 EST
Article-I.D.: ucbvax.8603190936.AA19772
Posted: Tue Mar 18 14:51:00 1986
Date-Received: Fri, 21-Mar-86 03:33:24 EST
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I'm writing a program to dial out from a VAX 8600 using a DMZ-32 connected
to a RACAL-VADIC 3451 programmable modem.  There is no clear guide in the
I/O manual to the services required to control a line with full modem control
signals.  I have gotten as far as determining that I must turn off character-
istic TT$M_MODEM in order to send dialing commands to the modem, because VMS
will not transmit to a "modem" if it does not sense carrier.  But when I
complete my call and sense carrier manually, I want to turn TT$M_MODEM back
on so that VMS will detect hangup.  When I set TT$M_MODEM, VMS drops DTR,
causing a disconnect.  The documentation indicates that VMS will drop DTR
if one SETS, then RESETS TT$M_MODEM.  Do I have to manually sense carrier
loss?  Has anyone else done dialout control?  Please reply to:

McGuire_Ed%GRINNELL.MailNet@MULTICS.MIT.EDU