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'[EE] Alarm Reporting'
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.
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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.
Herbert's PIC Stuff:
In the Industry Standards dropdown look for
SIA DC-05-1999.09 - DCS Ademco Contact ID Standard
Shawn Yates 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.
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.
SIA sends info using half duplex 300 or 1200 baud FSK the information it
send can be quite diverse including the capability of being bidirectional.
Most alarm panels on the market today have the capability of being
programmed to send at least two and sometimes all three of these formats.
M. Adam Davis
If you check the price of the other documents you can feel a little
better about it.
You do have a point though, using "security industry" and "standards" in
the same sentence takes a great leap of faith.
M. Adam Davis wrote:
On Tue, 17 Jan 2006, piclist wrote:
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).
On Tue, 17 Jan 2006, M. Adam Davis wrote:
> Wow - it's only $5.00????
> Are you sure this is a _real_ standards organization?
Ssshh. If they read your message they will upgrade to ieee 'standards'
> 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).
MF or the "extra row" of DTMF?
Calculating the message yourself is one of the greatest errors you can
make with a security system.
That was the greatest downfall of the 4x2 format, 2 hex digits available
to identify alarm type (burg, fire etc) and zone (front door, hall way
etc). Since there was only a pseudo standard for what hex digits mean
what, communication of meanings at the time of install between the
installer of the security system and the central station doing the
monitoring was of tantamount importance. Unfortunately this didn't
happen in a large amount of cases.
The industry eventually realized this and created contact id and sia
standards. Each of these standards send a unique signal type (Burg, Fire
etc.) and Zone Number for the zones that are violated at the time of the
When sending Contact ID, the alarm transmitter does listen for a
particular handshake tone (that is not DTMF) from the receiver, once it
is detected all transmittion from the sender to receiver is in standard
"DTMF" that any receiver that adheres to telco DTMF will understand.
I can send a properly formatted Contact ID signal to a regular Central
Station Alarm Receiver using a normal modem.
No special tones involved other than the tones the CS receiver sends for
handshake/kissoff. The CS Receiver will not know the difference if it
received an alarm from an alarm system or from my modem.
On Wed, 18 Jan 2006, Dave Lag wrote:
Afaik the Contact ID uses non-dtmf start and stop tones. The simple
alarms cannot use these.
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