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000084_news@columbia.edu _Sun Oct 22 19:09:50 2000.msg
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Message-ID: <39F372B3.C3AC6A78@adelaide.edu.au>
Date: Mon, 23 Oct 2000 08:35:23 +0930
From: Arthur Marsh <arthur.marsh@adelaide.edu.au>
Organization: The University of Adelaide - Information Technology Services
Subject: Re: No Carrier
To: kermit.misc@columbia.edu
Mark Sapiro wrote:
>
> Jeffrey Altman <jaltman@watsun.cc.columbia.edu> wrote:
> | In article <9jGH5.66100$bI6.2391998@news1.giganews.com>,
> | Steve <steve@baus-systems.com> wrote:
> | :
> | : The problem is if we are going
> | : over a modem, the phone line is dropped when we exit K95.
>
> | If you put a breakout box on the serial port you will see that the
> | Windows serial port driver drops the DTR signal every time the device
> | is closed. The device is closed each and everytime K95 terminates
> | unless the device handle was passed to K95 when it is started. When
> | DTR is dropped the modem hangs up the phone call.
>
> At least some modems can be set to ignore the DTR signal and not
> drop carrier when DTR drops. The 'AT' command to tell the modem
> to ignore DTR is usually '&D0'.
>
> Of course if you use this option, you can't use DTR to tell the
> modem to answer a ring. You have to tell the modem to auto
> answer after n rings (usually with'S0=n').
Not necessarily.
DTR isn't for modem to DTE control, it's for the DTE to hangup a call
(by dropping DTR).
Of course the RI (Ring Indicate) line on the modem's serial port will
go on and off when there's a call (not that it's usual to have one's
software detect it), and if the modem is set to verbose mode there will
be the string "RING" followed by a carriage return appearing from the
modem. Similarly there is a numeric code for "RING" if the modem is in
numeric response mode.
Arthur.
>
> These commands can be in the modem init string.
>
> --
> Mark Sapiro <msapiro@value.net> The highway is for gamblers,
> San Francisco Bay Area, California better use your sense - B. Dylan
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