Use the D278S Four-wire Addressable Detector Base with smoke and heat detector heads to provide early warning fire detection for life safety and property protection systems. The D278S is a 12 VDC base for use in systems controlled by a D7412G or D9412G 12 VDC Control Panels with a D8125 POPEX Module. The D278S has a built-in POPIT to provide individual addresses on the FACP data expansion circuit.