Surface-mounted data gathering modules that connects to a multiplex loop to monitor up to 8 and 16 zones per panel, respectively. With end-of-line supervision of input points, these units include tamper switch, camlock, 60 hour standby battery, and a built-in charger. They transmit alarm, trouble, AC fail, tamper and low battery messages to the System 3500/3000 for display. Supervises contact closures within the same room. Use lightning protection boards when extending the distance of zone inputs.