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From: crimmins@uxc.cso.uiuc.edu
Newsgroups: comp.sys.ibm.pc
Subject: Re: Controlling a modem
Message-ID: <174200068@uxc.cso.uiuc.edu>
Date: Thu, 12-Nov-87 14:40:00 EST
Article-I.D.: uxc.174200068
Posted: Thu Nov 12 14:40:00 1987
Date-Received: Sun, 15-Nov-87 08:31:32 EST
References: <21410@cmcl2.NYU.EDU>
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Nf-From: uxc.cso.uiuc.edu!crimmins    Nov 12 13:40:00 1987


/* Written  8:05 am  Nov 10, 1987 by andersnb@cmcl2.NYU.EDU in uxc.cso.uiuc.edu:comp.sys.ibm.pc */
> 
> 	I am try to write a simple program that accesses my Hayes 1200 baud
> modem, instructing it to dial a number (no actual data communication
> is needed as the call will always be voice).  I am using MSC 4.0
> (no 5.0 yet!). I tried opening to the COM1 port and writing the 
> appropriate control strings, no luck.  I then tried using BIOS routines
> directly, again no luck.  The modem does not respond.

Try doing an fprintf(stdaux,"ATDTxxxxxxx");

No open is necessary.  This is one of the handles that are automagically
opened when the program is run (stdin, stdout, stderr, stdprn, stdaux).

It's all in the manual.

-- Dan Crimmins
   crimmins@uxc.cso.uiuc.edu