ADT sounder unit

Old 09-12-05, 04:19 PM
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ADT sounder unit

Im having problems figuring out the wiring from a normal alarm panel to an ADT sounder unit. I was havin trouble figuring out what wires go from the panel to the sounder unit. I have since been told what outputs go to the siren, but they just dont make sense. There are 7 terminals on the sounder unt, 3 of which I have eliminated and are for battery backup or engineer mode which leaves me with 4 terminals below. You would assume that 2 of those are for the tamper loop, and that the other 2 are pos and neg from the sounder output on the alarm panel. The following connections were supplied to me:

+H positive hold off (permanent +12V)
-H negative hold off (permanent 0V)
RTN 0V tamper return (negative tamper return to control panel)
-R siren and strobe trigger (apply 0V to activate)

I assume the +H and -H are permanent feeds to hold charge for the battery backup system. I don't understand why the siren trigger is a negative feed??? and I thought the tamper cicuit was a loop, so why only 1 output???? I'm confused. Someone please help. Thanks.
Old 09-12-05, 05:59 PM
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I think that the unit you have was made for one of the all in one units like a Lynx.

It seems to require 12v power, and a negative trigger current.

Many alarm panels use auxillary outputs that complete a path to ground when triggered. It's a fairly standard design option, normally used to control relays.

Basically, without jumping through a bunch of hoops, the only way I can think of for this siren to work for you would be to try connecting the +H to the positive siren output, and the -H and -R to the negative siren output. Ignore the tampers for now.

It may be less hassle to simply get a standard 12vdc siren, but give this a try.

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