Re: Re: How do I tell whether the phone's ringing?

["David Buckley" <db@xxxxxxx>]

Many modems support the RI signal, an RS232 jobbie that goes true on
incoming ringing.  When I last played with this, you did not need to enable
auto answer.

----- Original Message -----
From: "Ant Skelton" <ant@xxxxxxx>
Newsgroups: tex.com.ml.ukha_d
Sent: 05 December 2001 13:52
Subject: Re: [ukha_d] Re: How do I tell whether the phone's ringing?


> Mark Harrison wrote:
> >
> > Hmmm... really wanted something that didn't involve a PC :-(
>
> You could use a modem plugged in to the phone line. When the phone
> rings, the modem will send "RING RING" out the serial port.
Not sure
> whether you can interface this to homevision, as I don't have one.
>
> My guess would be you either have an rs232 port (in which case you're
> laughing) or a TTL IO pin or somesuch, which might be tricker. To
> interface to that I guess you'd need to knock up a simple little
circuit
> - not sure if that's your bag or not.
>
> Although thinking about it, I don't thing modems send out anything
else
> down the serial port when they're quiescent, so maybe looking for
level
> changes on the modem's serial TX line would be sufficient.
>
> YMMV, HTH etc
>
> ant
> --
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> ant@xxxxxxx                   (`')                  www.ant.org
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