2 wire sensors interface


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

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