I am in the process of installing a Konnected board and trying to make sense of the current (legacy) alarm system wiring.
My house apparently has 7 "zones" (7 different sensors, from motion sensor to door/window sensors) , 2 keypads (that show the status of each "zone") and a bell.
So far, so good. Then I looked at the existing alarm board and tried to map each of the cables to its "zone"/sensor. This is where things stop making sense to me:
I can count 10 cables that go out of the alarm board:
- 1 is the AC power.
- 1 is the bell/siren.
- 1 is the phone line.
- 5 connect to each of the Z1..5 screw connectors on the board (and are, I suppose connected to the various sensors)
- 2 are connected on the same YEL/GRN screw connector, and from what I gather, these are the 2 keypads (it would make sense as those show the exact same status apparently).
Now what bothers me is the 5 "Z" ports but I have 7 distinctively working sensors. The existing alarm can detect each of the 7 sensors/"zone" individually and uniquely. It's not a case of sensors wired in series (I suppose). But how can the system handle 7 sensors when only 5 "Z" ports are connected ?
One of my theories is that the YEL/GRN pair for the keypads are actually some sort of data wires (not unlike USB cables) that use an encoding of some sort and are not just dumb closed/opened circuits. Since each of the keypad is close to a monitored door, I also assume the door sensors are actually connected to the keypads.
But this is all conjecture and I don't know much about this. Could anyone explain/emit a theory as to how these currently works? Also, how can I plug that to Konnected (I would be okay in discarding one of the motion sensors to get down to 6 zones btw).