Addressable monitor modules AMM-4SF feature a single Style D, Class A initiating device circuit. They may also be configured as a Style B, Class B initiating circuit with an end-of-line resistor. These modules provide an address for a group of conventional 2-wire smoke detectors. Any alarm initiating devices with normally open dry contacts such as heat detectors, manual stations, linear heat detection devices, water flow switches, 4-wire smoke detectors, and tamper switches may also be installed in the circuit.