Hi GuysSpanky said:BSR, Ole Steelers Fan,
If you have a circuit with say 1000 ohm EOL resistors installed somewhere on the zone, you can put an additional resistor at the control to bring it upto the 2200 ohm resistance.
A 1000 ohm in series with an existing 1000 ohm will work fine on the M1.
The downside is that you can not have normally open switches on the zone. You hardly ever see any of those anymore. The only kind I recall is normally open under carpet matting.
I have previously worked in security industry installing and servicing from 1982 /1996 and industry standard ( then) was to wire N/C ... except as mentioned before pressure mats.....I think Signalman is referring to wiring the sensors much like smoke detectors ...normally open with a resistor across the normally open at the sensor ......Back then i dont recall any alarm sensors having normally open contacts.....
Personally i would still use the resistors and place them at each sensor if possible....
Frank