2 wire sensor interface

[gavatepravin@xxxxxxxxx]

Hi,

  We are planning to use 2 wire addressable sensors (PIRs and smoke
detectors)in our design.   Usually we purchase stand-alone 4 wire
(relay output) sensors. and interface with our control board.


    If I want to interface these sensors to our controller board. How
can I interface this.


Actually we require wire break function. In this if a wire cuts of a
sensor, it should report to the controller board. How we can implement
this function. we are supposed to implement this function using 2 wire
interface. Is there any other method for this.


Thanks in advance