Title: Hardware Installation Guide.pdf
Intelligent System Controller Communications OverviewAccess Control SystemCommunications from Host to Controller RS-232, RS-485, Ethernet Dial-up, Fiber, etc...32 Downstream Devices TotalRS-485 Multi-drop 2 or 4 wireIntelligent System ControllerDownstream Communications • Four 2-wire ports • Two 4-wire ports • Combination 2 and 4 wire portsSingle Reader Interface ModuleDual Reader Interface ModuleInput/Output Control Module(s)