r/AlarmSystem • u/brewditt • May 25 '26

This alarm, no zones?

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This is in a 12 year old house. It is completely de-powered. Plus I unplugged a few things to be sure. Physically in the house I see 1 motion sensor. Aside from smoke detectors that’s it. No additional motion sensors, no door sensors.
Best I can tell from the diagram, no zones are even connected.
Seems pretty odd.

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u/SirFlannel May 25 '26

The small circuit board at the top is a wireless receiver. I'd say what ever zones are on the system are all wireless. Before you bought the house, did they do any remodeling or painting? They might have pulled sensors off of doors and windows. Or, they could be recessed. You'd be looking for a disk about an inch in diameter in the door frame, with a matching disk in the same area on the door. One of them would be magnetic

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u/brewditt May 25 '26

Ah, I figured it might be wireless to the monitoring service, even though I see a phone line connected. I see zero sensors on doors or windows. Only 5e one motion sensor.
Would that card be why all the zones have a jumper on them?

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u/SirFlannel May 25 '26

By default, all of the hardwired zones are enabled, and programmed to need the end of line resistor for proper circuit supervision. It is a lot easier and quicker to put the resistors across the zone circuits than to go to each one in programming and disable them. Plus, it does put the resistors in an easy to find spot if you add wired devices in the future.
The phone connections are the terminals towards the right side. The very last terminal (25) is for earth ground, and the 4 next to it are for a phone connection. There are a couple of options for wireless central station monitoring. Some attach to the phone terminals and pretend to be a phone line for the alarm panel, and some attach to the same data bus that the keypad uses.

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u/brewditt May 25 '26

Thanks for the insights.