In article ,
Old Nick wrote:

On Fri, 31 Dec 2004 13:45:57 -0500, Nick Hull
vaguely proposed a theory
......and in reply I say!:

remove ns from my header address to reply via email

Ok. Yep. The system I have can do a _similar_ job if you use a pager.
You can habe it send data codes preset by you. It actually has a way
to tell monitoring cos what sensors have gone off, so I assume I could
set it up that way for me as well. I was using the phone, and hearing
Beep beep beep would not mean much to me ! G

Thanks for the explanation.

Have you actually modified the RS dialler to "pretend" that buttons
have been pushed according to input, or did you buy a unit that works
as you describe?

I modified the RS dialer myself; relays "push the buttons". Relays may
seem obsolete but they are more immune to lightning, and every couple of
years I get REAL lightning. You could probably do it more elegantly
with transistors but I go for crude reliability. Besides, once it's
working I stop fixing it.

You don't have a dialer for every sensor, you have one dialer that dials
tha same pager number every time then adds DTMF tones corresponding to
the sensor. For example, if someone drives in my driveway that is #26
so my pager reads 26-26-26. This is EZ to do with a cheap Radio Shack
dialer that holds 100 numbers by pushing 2 buttons. I only use 6
buttons (1-6) so I have 36 codes from 11 to 66 although I could use all
100 with a few extra wires.


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