What is the purpose of an alarm signal's “heartbeat”?

The purpose of an alarm signal's "heartbeat" is to periodically check the communication link between devices. This regular transmission helps ensure that the devices in an alarm system can communicate effectively and that the system is functioning properly. If the heartbeat signal is not received as expected, it may indicate a communication failure, which could be due to issues like a malfunctioning device, a disconnected wire, or interference.

The heartbeat signal acts as a diagnostic tool, allowing system operators to identify and address potential issues before they result in a full system failure or, worse, the inability to respond to an actual alarm event. Regular communication checks help maintain the integrity of the security system, ensuring that all components are working together as they should.