The Napco Conventional Zone Module (FWCFSLC-CZM) is designed for use with an analog addressable Fire Alarm system. Up to 127 devices can be placed on a single SLC loop. The device address is uniquely stored on an onboard EEPROM chips. The CZM module allows the panel to interface and monitor two-wire conventional detectors or pull stations. Each FSLC-CZM transmits the status of one zone of devices (25 maximum per zone) back to the panel. It supervises the power supply as well as the entire zone of devices. Status conditions are reported as normal, open or alarm. All 2-wire smoke detectors must be UL Listed as compatible to be interfaced with the FWC-FSLC-CZM. The interrupt-driven communication protocol combines maximum communication reliability and fast response to emergency conditions. The module has a single bi-colored LED to indicate device status. It fits into a standard 4" square or double-gang electrical back box.