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From: perl@rdin.UUCP (Robert Perlberg)
Newsgroups: net.micro
Subject: Re: Hayes Smartmodem carrier detect
Message-ID: <427@rdin.UUCP>
Date: Thu, 12-Jul-84 11:46:01 EDT
Article-I.D.: rdin.427
Posted: Thu Jul 12 11:46:01 1984
Date-Received: Sun, 15-Jul-84 07:10:34 EDT
Organization: Resource Dynamics Inc., New York
Lines: 33

<>

What we have here is a case of misreading.  Here is the complete
manual entry:

Page 7-12:

This delay time allows the carrier to momentarily disappear without
causing the modem to disconnect.  The value assigned to S10 is
adjustable in tenths of seconds.  The default value is 7 for
a delay time of 700 milliseconds.

Setting S10 to 255 will cause the Smartmodem 1200 to ignore carrier
detect status.  The Smartmodem 1200 will always act as if a carrier
is present.  However, the CD indicator light and the RS-232 Carrier
Detect line will follow the true carrier status.

end_of_extract

Need I say more?  If you had taken the time to read the whole
paragraph instead of just one line you would have seen that the
statement in question is conditional on your setting S10 to 255,
a very special case.  Not only that, the last sentence indicates
that the RS-232 carrier detect line will ALWAYS indicate carrier
detect whether you are using this option or not.

If your carrier detect line is always TRUE, it might be because
dip switch #6 is down (see page 2-6).

Robert Perlberg
Resource Dynamics Inc.
New York
philabs!rdin!perl