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

["Ian B" <Ian@xxxxxxx>]

This depends on the output from the modem. If it is a continuous high then
yes but if it 'rings' like the phone bell then the delay could reset itself
and then be triggered again. A prod with a multimeter or scope would tell.

Ian

> -----Original Message-----
> From: Mark Harrison [mailto:Mark.Harrison@xxxxxxx]
> Sent: 07 December 2001 12:22
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Re: How do I tell whether the phone's ringing?
>
>
> Ian,
>
> I guess that the appropriate line on a modem is the best way.
>
> I would have thought that with a 5 second delay, then there was no
fancy
> HV programming to be done. The "gone low" would mean 
"it's rining now",
> and the "gone high" would mean "it's stopped"  =
Have I understood
> correctly?
>
> Regards,
>
> Mark Harrison
> Head of Systems, eKingfisher
>
> -----Original Message-----
> From: Ian B [mailto:Ian@xxxxxxx]
> Sent: 6 December 2001 20:24
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Re: How do I tell whether the phone's ringing?
>
>
> OK Mark
>
> As the delay unit stands it accepts a +ve signal as a trigger and has
a
> delay adjustable from almost nothing to about 5 seconds. Assuming it
is
> triggered by either the phone line itself via an optocoupler (chip
> thingy)
> or through the modem ring line it can bring an HV input port low for
the
> delay time set. This will give HV time to notice the port change of
> state
> even if it is doing something else for a short while and do whatever
is
> programmed. I guess the only thing to program round is multiple
triggers
> if
> the delay is short. More detail on this another time but it is easy to
> program round with a timer.
>
> Let me know how you want to connect it and I will think about how to
do
> it.
>
> Ian
>
> > -----Original Message-----
> > From: Mark Harrison [mailto:Mark.Harrison@xxxxxxx]
> > Sent: 06 December 2001 09:17
> > To: ukha_d@xxxxxxx
> > Subject: RE: [ukha_d] Re: How do I tell whether the phone's
ringing?
> >
> >
> > I'M INTERESTED!
> >
> > Mark Harrison
> > Head of Systems, eKingfisher
> >
> >
>
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> >
> > -----Original Message-----
> > From: Ian B [mailto:Ian@xxxxxxx]
> > Sent: 5 December 2001 20:35
> > To: ukha_d@xxxxxxx
> > Subject: RE: [ukha_d] Re: How do I tell whether the phone's
ringing?
> >
> >
> > I have a little delay unit that can take a modem out signal and
bring
> an
> > HV
> > input port low. I'd have to see (prod with a meter) the modem to
be
> sure
> > but
> > I don't see any reason why not.
> >
> > Shout if you are interested.
> >
> > Ian
> >
> > > -----Original Message-----
> > > From: Ant Skelton [mailto:ant@xxxxxxx]
> > > Sent: 05 December 2001 13:52
> > > To: ukha_d@xxxxxxx
> > > 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
> > > --
> > >                               /\/\
> > > ant@xxxxxxx                   (`')                 
www.ant.org
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