System Sensor M502M Addressable Interface Module OP121 self-diagnostic circuitry contained in the

self-diagnostic circuitry contained in the Siemens photoelectric (conventional) smoke detector

programmable sounder base

The Edwards EST 5251FB is an intelligent Heat Detector

The NCM-W provides two sets of switches to simplify network setup

System Sensor M502M Addressable Interface Module OP121 self-diagnostic circuitry contained in theThe M502M Interface Module is intended for use in intelligent, two wire systems, where the individual address of each module is selected using the built in rotary decade switches. This module allows intelligent panels to interface and monitor two wire conventional smoke detectors. It transmits the status (normal, open, or alarm) of one full zone of conventional detectors back to the control panel. All two wire detectors being monitored must be UL