it really depends on the control panel (end station).

some of our systems rely on 2 resistors.

4.7k accross the redd (or relay contact on PIR`s)
and a 2.2k in seroes with one of the legs from the panel.

this gives 4.7k when closed (quite mode)
6.9k in alarm
O/C in tamper

this we have found is the best way, but it realy depends on the panel.

some panels use, 1.0k for both 4.7k or even 6.8k.

good luck, if you need any advice e mail me.

Britspark