The IQ611MO input-output module provides one 24VDC output and one feedback input monitor. The input line is monitored for open line faults and ground faults, and the contact must thus be wired with an end-of-line resistor. The output line is monitored for open lines, short-circuit faults, ground faults, and external 24VDC power source loss. It is a UL listed device according to UL864 for Fire Protective Signalling Systems for indoor use and FM. When the output is activated the device red LED will indicate the event condition by blinking longer. When the feedback is activated the device red LED will indicate the event condition by blinking twice. A return to the normal condition will cause the event to disappear and the device LED indicator will return to blinking every 4 seconds. The IQ611MO is an intelligent addressable module and takes one address on the Signalling Line Circuit (SLC) or Data Communication Link (DCL) of the fire alarm control panel.