Home alarm system serial data

Started by meenbombs February 3, 2006
I am assuming home alarm systems use a serial interface of some type
to connect the keypad to the alarm panel.  Does anybody have any
experience interfacing a BX anywhere to an alarm system.  I more
specifically want to connect a wireless expander to my BX that is
designed to connect to the 4 wire cable that runs from the keypad to
the panel.  Because the expanders go from 1 to 96 zones on 4 wires I
am assuming it is two wires for power and two for data.  Any
experience or ideas?