X.00 v124 problem dropping DTR

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2 total messages Started by Albatross Wed, 05 Aug 1992 16:51

#56

Author: Albatross
Date: Wed, 05 Aug 1992 16:51

25 lines
1688 bytes

I'm using X.00 v 124 for a communications program and up till now everything
looked good.  I can communicate through the port fine.  Now I have a problem.

According to the documentation all I need to do to toggle DTR is (in C)

regs.h.ah = 6; //(DTR status)
regs.l.al = 0; //(or 1 for UP but I'm trying to get it down)
regs.x.dx = 0; //(COM 1)
X00(&regs, &regs);

Seems simple enough, but nothing happens.  DTR stays up.

I'm using a Multitech MultiModem V.32 attached to an IBM PS/2 80.
No, my modem's DTR toggle switch is not on "DTR always up".

My config.sys file reads  DEVICE=C:\X00.SYS E F=15 R=1024

If anyone has any ideas, please send me E-mail soonest.  Thanks in advance
for your assistance.

--
Bob Alberti: Computer & Information Services U of MN | aka: Albatross | Unitar-
E-mail     : alberti@boombox.micro.umn.edu           | Metropolis BBS | ian/
Disclaimer : My employer does not mean what I say.   | (612) 721-1870 | Univer-
Minnesota  : Where butter is a spice.                | BBSing as art. | salist!

Re: X.00 v124 problem dropping DTR

#58

Author: Albatross
Date: Wed, 05 Aug 1992 21:30

23 lines
1767 bytes

In <1992Aug5.165155.8708@news2.cis.umn.edu> alberti@mudhoney.micro.umn.edu (Albatross) writes:

>I'm using X.00 v 124 for a communications program and up till now everything
>looked good.  I can communicate through the port fine.  Now I have a problem.

>According to the documentation all I need to do to toggle DTR is (in C)

>regs.h.ah = 6; //(DTR status)
>regs.l.al = 0; //(or 1 for UP but I'm trying to get it down)
>regs.x.dx = 0; //(COM 1)
>X00(&regs, &regs);

>Seems simple enough, but nothing happens.  DTR stays up.

In a followup, I can toggle DTR from OUTSIDE my program using XU:  whichever
state I leave DTR in, the program cannot change it.  So if I use XU to put
DTR ON, it stays on, and if I use XU to put DTR OFF, it stays off, even when
my program does an "Activate port" Function 1Ch.  Anybody?
--
Bob Alberti: Computer & Information Services U of MN | aka: Albatross | Unitar-
E-mail     : alberti@boombox.micro.umn.edu           | Metropolis BBS | ian/
Disclaimer : My employer does not mean what I say.   | (612) 721-1870 | Univer-
Minnesota  : Where butter is a spice.                | BBSing as art. | salist!

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