Do 2-wire motions exist?

Woah, I thought that was a no-no. The keypad is on a 4-wire bus, not aux power. Am I wrong here?

You could tap into the keypad power wires to power the motion..........

Technically, it's a two-wire data bus with + and - terminals supplying 13.8 volts DC to power devices on the Bus... Keypad, AUX, & Fire power all come from the same power supply........ Regards, Russ

That's great to know! So, basically I've got aux power whenever I need to power anything right there at any keypad in the house, right?

Yes except some panels have a lower net current available at the keypad bus than direct from Aux power. A single motion might not be an issue, but some older style dual tecs or microwaves draw a lot of power.

You could run a small aux powersupply and b/u battery and remote power the pir, Ive done that in exteme situations. If there's room near the keypad, perhaps in a closet or something to put the pwr supply.

, but probably running off the keypad bus power will work ok. LOL.

Keypad power is very limited on most panels.

If you are worried about power for your motion, how about a battery PIR that can be just dropped into an existing alarm loop? This is the only type of two-wire motion I know of.

BobbyD

Total nerd wrote: