DPU3048 is a 4 Doors Controller with pre-assigned 2 readers for each door. The controller door configuration can be set for each door as One Reader (IN only) or Two Reader (IN/OUT). Each door has corresponding Door Relay, REX Input and Door Sense Input. In addition, there are, programmable, 4 Inputs and 4 Outputs for added functionality. DPU3048NT is an excellent solution for Door Interlocking, Anti-Pass-Back and Time & Attendance applications. Even when network is down, it will continue operating without any change in behavior including all local Interlocking and Anti-Pass-Back rules. When network recover, all data will be seamlessly updated in SPHINX 4 software.