Reply With QuoteI haven't seen one for sale new for years. DAS use to sell them. They might be worth a shot.
DTMF decoder/contact id reader..
Hi,
I've seen a few techs with these devices they can hookup to the phone line of an alarm panel and when it dials it shows them what is being sent as in the raw contact ID code. Any idea where I can get one? Every tech I ask says a guy used to make them years ago, but each tech seems to have a different looking one so surely its possible to buy them from somewhere...
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I haven't seen one for sale new for years. DAS use to sell them. They might be worth a shot.
You can get them from MCM, but you have to use it with a laptop.
MCM is that short for something?
I would be keen on one of these - do they duplicate the kiss off and everything?
MCM Electronics.
MCM are based in NSW and they sell Icon series of panels, as well as GSM and IP comms products. Well worth a look.
I've borrowed one from a tech at work, looks like it was custom made back in 92. There are two circuit boards one on top of the other and they have some connecting pins so I'm unable to separate to look at how the thing works. It’s a great device, very keen on sourcing one or even having a closer look at the one I have and building a few.
It does duplicate the kiss off and everything...
Basically has two plugs, one for power which you get from the panel battery and the other you plug into the alarm panel phone. When the panel dials it shows the phone number its dialing then it shows the contact ID code it sends out. So from this you can get the line number and all. Great for troubleshooting!
Hmmm...
I better get moving on the one I developed a couple of years ago huh?
4 line LCD (may change)
Also can connect to laptop
Power from panel
611 socket to plug panel line into
Dial tone, handshake & kissoff all generated
Hand held type case
That's what it does, just gotta finish it.
Any other suggestions for functions?
PM them to me and I'll see.
Last edited by muddy0409; 26-05-12 at 11:11 PM.
or rj45 socketOriginally Posted by muddy0409
There's a great app for Android phones that runs at alarm panel DTMF speeds that you can use to listen in via a phone. It's imaginatively called DTMF.
How does it work?
Hold it up to the phone speaker, it runs a DSP algorithm (probably a modified Goertzel filter) over the captured sound and displays the numbers.
Which means the dialer has to be connected and communicating with a receiver somewhere??
How far away are you from finishing, I'd be interested in buying one
yeah get that thing done! I would be keen on one
I am currently right back where I was when I left off 12 months ago, trying to find a suitable case for the LCD display..
A 16 character display doesn't really provide an easily readable message, so I gotta go to a 20 character display. A 4 x 20 seems the size to use, however a case with a cutout for that size is a bit hard to find.
I did see a 20 character display with the same size as va 16 chr unit and if I can source these, that will be a damn good place to re-start.
All the design has been done already, just gotta find a box to stick it all in.
123418E10101Z001 is what you would get on a 16 chr display
1234 18 E101 01 Z001 is what you would get on 20 chrs. A bit more readable.
My Fluke phone butt has a dtmf decoder in it, altho i can see and easily read the phone number its dialing, but then the account number is hard as the screen is just flooded with fast contact id, pity i cant pause it or scroll to start ect.
Yeah, with a simple decoder monitoring a panel that's talking to a CMS you gotta put up with the speed. With my unit I can jiggery-poke the timing between calls a bit.
Just tested three of the iphone DTMF apps - they seem to read the phone numbers dialled OK but are too slow to decode the contact ID stream. With a bit of work someone might make an app that works. I think it would need to capture the CID strings and slow them down to decode them.If you just want to read the number dialled try the $0.99 app.
Hmmm...that's a little odd Panda. CID is sent at 10 tones per second, which is the same as normal (automated, not manual) dialing speed. So if the app can't read the CID it must be something other than a speed problem.
The dialling of the phone number seems slower I'd guess 3 or 4 tones per second. The CID data string would be 10 tones per second. Let us know when your tester is ready there should be a market for it.
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