On Tue, 17 Jan 2006, piclist wrote:

> Peter wrote:
>
>> On Tue, 17 Jan 2006, Herbert Graf wrote:
>> 
>> 
>>> On Tue, 2006-01-17 at 08:57 -0500, Shawn Yates wrote:
>>> 
>>>> Can anyone tell me where I can find the specifications for having an
>>>> alarm panel report to a central monitoring station?  I am looking for
>>>> the Contact ID protocol to be exact.  Any help is appreciated.
>>>> 
>>> I may be wrong, but considering how competitive that market is, I'm
>>> quite certain that the protocols are all proprietary and not compatible
>>> with each other, and are surely not something you are meant to be able
>>> to find in the public domain.
>>> 
>> 
>> Most simpler systems dial into the center and send DTMF codes. One can 
>> program just about anything to be sent.
>> 
>> Peter
>> 
> Although many proprietary alarm protocols have come and mostly gone, the 
> three most popular remaining are 4x2, Ademco Contact  ID and SIA protocols.
>
> 4x2 uses pulsed tones to send 4 (account number) and 2 (alarm signal) hex 
> digits at 10, 20 or 40 pps.
> Ademco Contact ID sends 15 (information) and 1(checksum) DTMF digits 
> representing account number, event code and zone number etc.

What I meant was, you get to calculate the messages yourself, and store 
them if you want it to be compatible. I also think that the Contact ID 
requires some special tones which cannot be made with a regular DTMF 
(and which are not issued by the cheap alarm dialers I alluded to).

Peter
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