What does the term "end-of-line resistor" refer to?

The term "end-of-line resistor" refers to a resistor that is used to monitor circuit integrity, which is critical in fire alarm systems. It is placed at the end of a detection circuit and serves multiple functions, including ensuring that the circuit continuity is maintained and providing a means to detect faults such as shorts or opens in the wiring. By having this resistor at the end, the fire alarm control panel can measure the resistance in the circuit. If the resistance value deviates from what is expected, the panel can alert the user to a potential issue, thereby enhancing the reliability and safety of the fire alarm system. This feature is fundamental to ensuring the system operates as intended, as it guarantees that all components are functioning and communicates effectively.