1、PLC can provide a redesigned protocol, after connecting to the router, and such control board can make access control via network from anywhere in the world, which is for Android / Tablet / for Windows system, 2、With reset function, programmable logic controller supports that short press can reset while long press can restore factory settings, which also supports 485 network. 3、To protect internal circuits, programmable controller module with optocoupler enables to prevent external voltage surges. 4、For thicker tinned relay wiring, such PLC's 8 external control outputs and low level can effectively control switches or sensors, etc. 5、Support status return, PLC can display the current status of the relay, and IP port can be modified. 6、Press and hold “RESET” until the light goes out. Then it will restore the factory default IP and port number. Item Type: Control board Trigger Signal Input: There are two input methods for IN1-IN8: A: Non-contact signal, released after IN is grounded B: Latch signal, IN grounding controls the corresponding relay switch 2: Serial Communication Protocol: 1 way open: FD 02 20 01 01 5D 1 way close: FD 02 20 01 00 5D 2 way open: FD 02 20 02 01 5D 2-way close: FD 02 20 02 00 5D 3-way open: FD 02 20 03 01 5D 3-way close: FD 02 20 03 00 5D, 4-way open: FD 02 20 04 01 5D 4-way close: FD 02 20 04 00 5D 5 way open: FD 02 20 05 01 5D 5-way close: FD 02 20 05 00 5D 6 way open: FD 02 20 06 01 5D 6-way close: FD 02 20 06 00 5D 7 way open: FD 02 20 07 01 5D 7 way close: FD 02 20 07 00 5D 8 way open: FD 02 20 08 01 5D 8-way close: FD 02 20 08 00 5D Open 1-8: FD 02 20 for F8 88 5D 1-8 pass: FD 02 20 for F8 80 5D Return: FB 21 55 xx XX FF: xx XX eac byte means 1ch high byte corresponds to 16ch, low byte corresponds to 1ch Network Controller Port: IP: 192.168.1.4 Port Number: 30000 Wide Operating Voltage Range: 7-24V DC power supply Internal Circuit Protection: With optocoupler to prevent external voltage surge Port: Ethernet TCP / IP RJ45 port Onbaord WEB Server: Allows access and control of relays via WEB 8-Channel 250V / AC 10A Relay: Individually controlled 1 x Controller Board