The RS485 communication module supports two-wire RS485 multidrop transmission between networked ZX2Se/ZXSe/ZX5Se control panels, between ZX series control panels and repeaters or between ZX series control panels and serial peripheral devices. Using a shielded twistedpair cable with a cross sectional area of minimum 0.5 mm2 (24 AWG), the RS485 module will support cable/bus lengths of 1,200 meters (3937 ft) per channel.