04-09-2025, 09:01 AM
(04-09-2025, 08:27 AM)twostar Wrote:(04-09-2025, 05:58 AM)jaydubnz Wrote: I have PIR sensors all over the house connected to an old alarm system. The voltage on the NO contacts are between 1.5v to 3v, which I think is too low for the digital inputs 1 to 16 to register as ON.
The inputs are dry-contact, there shouldn't be any voltage on them. Do the sensors have EOL resistors which could be presenting a voltage on the input?
Hey, yes they do!
I just read the PIR manual and it says it supports up to 24V DC for the input and output.
I'm quite a noob at all this stuff, I'm assuming the EOL resistors are lowering the output voltage down to 1.5v.
Might replacing them with a lower ohm rating increase voltage to 12v? Is this a good idea, or would it cause a lot of power draw and heat / fry my alarm panel board? hehe
thank you!