Re: Help understanding CID protocol

[ymg200@xxxxxxxxxx]

Gentlemen, you are all right. Thank you for your comments. After some
more thoughts and research on available panels I decided not to
reinvent the wheel. I will try to improve the tire thought :)


On Feb 12, 12:12=A0am, Jim <alarmi...@xxxxxxx> wrote:
> On Feb 11, 4:53 pm, ymg...@xxxxxxxxxx wrote:
>
> > My goal is to equip the new house with alarm system which is monitored
> > by the central station. I am new to security systems, but once I
> > started learning about them, my DIY personality started leaning
> > towards building a system myself.
> > By doing some research in this discussion group I learned that alarm
> > systems communicate with the monitoring station by sending CID
> > signals. If CID is a DTMF sequence, can I generate it using any DTMF
> > encoder? If I know the CID format that is expected by the monitoring
> > station, does this mean that I can have a computer to control a DTMF
> > encoder in order to send code sequences to the monitoring station? Is
> > there any response from the monitoring station that I need to listen
> > to, or I can be in "transmit only" mode? Is there any spec to CID tone
> > length, pause between tones, or any other restrictions?
> > Thank you.
>
> Trying to re-invent the wheel .......... are you?
>
> For about $60.00 you can buy a panel that has been engineered tried
> and tested and is a proven reliable UL listed device that will do what
> you want with a 99.9999% chance of it working when needed. Anything
> that you "invent" ...... however ..............
>
> As mentioned, if I were a Central Station I wouldn't touch such a
> system with a 10 foot pole. Something that's been hatched in someones
> garage trying to communicate with a million dollars worth of my
> central station equipment is NOT something I'd be willing to risk.
> Central stations usually monitor thousands of alarm panels and bear
> the liability of doing so. There's no way I'd want someones
> "invention" screwing up my ability to respond.