Newsgroups: comp.unix.sysv386
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From: gemini@geminix.in-berlin.de (Uwe Doering)
Subject: Re: SVR4 (i386) serial port setup
References: <1991May8.153108.21313@ux1.cso.uiuc.edu> <1991May8.172714.1412@cbnewsl.att.com> <1991May8.194639.28749@ux1.cso.uiuc.edu> <1991May13.125733.8838@cbnewsl.att.com>
Date: Tue, 14 May 1991 14:03:47 GMT
Distribution: na
Organization: Private UNIX Site
Keywords: SVR4, bidirectional, serial port, modem
Message-ID: <G1WQAAK@geminix.in-berlin.de>
Lines: 22

urban@cbnewsl.att.com (john.urban) writes:

>I forgot to ask this question before. The modem that you're using, does it
>have DTR strapped high or is it unstrapped?  If its strapped high, then I
>don't know what the problem is.  However, if it's unstrapped, you might
>not have the ,M in the Devices file for your "cu" port.
>
>ie: ACU tty01,M -  1200 hayes1200
>
>The ,M "tells" cu, ct or uucico not to worry about DTR during the \M to \m
>Dialers string in the Dialers file.  I the the BNU Guide talks about this.
>I don't have the guides in front of me.

This isn't quite right. I assume you meant DCD instead of DTR. DTR is
an output while DCD is the carrier detect input that blocks the open()
call if it is low.

       Uwe
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