The Napco FWC-FSLC-EZM1 Fast Response Contact Module and FWC-FSLC-EZM2 Dual Input Monitor Module are designed to be used with pull stations, water flow switches, and other applications requiring the monitoring of dry contact devices. The interrupt driven communications protocol combines maximum communication reliability and fast response to emergency conditions. The FWC-FSLC-EZM1 and FWCFSLC-EZM2 contact monitoring modules do not require a separate 24VDC power source. Each addressable contact monitoring module is programmed with its own unique Signaling Line Circuit (SLC) loop address. The FSLC-EZM2 utilizes only a single address for two (2) distinctive initiating points. The device address is electrically programmable and stored in the onboard EEPROM. Up to 127 devices can be placed on the Napco SLC loop. The module supervises the wiring to the contact with an End Of Line (EOL) resistor. It can be programmed to monitor Normally Open (NO) or Normally Closed (NC) contacts. If a fault condition occurs in the wiring, the module sends a trouble status signal to the fire alarm control panel. When a change of status (contact changes state) is sensed by the FWC-FSLC-EZM1 or FWC-FSLC-EZM2 it sends an interrupt to the control panel indicating that an alarm has occurred.