DC 7-25V 8DI-8DO RS485 Digital NPN Input and Output Module Optocoupler Isolated Communication MODBUS RTU PLC Expansion Board  Features:  1: Wide range of applications 2: With guide rail good installation 3: Small size 4: Stable performance 5: Operating voltage: DC 7-25V (9V 12V 24V) Description:  Road opto-isolated digital input channel (NPN low-level input) (ULN2803 NPN output) RS485 MODBUS RTU standard communication protocol Networking with configuration software, PLC or industrial touch screen Networking Lightning and interference-proof communication circuit immunity For signal acquisition and control in industrial sites Specifications:  1. Operating voltage: DC 7-25V (9V 12V 24V) 2. Operating current: 8-50MA 3. 8 optoisolated input port (NPN low level active) 4. 8 (ULN2803 NPN output), maximum load current 300MA per channel 5. RS485 communication isolation protection 3000VDC, DI digital input port isolation protection 3000VDC 6. Standard MODBUS RTU commands (function codes, 05/06/15/16 write, 01/02/03 read) 7. Baud rate: 1200 2400 4800 9600 (default) 19200 38400 57600 115200 8. Parity bits: none (default) / even / odd 9. Mounting method Standard DIN rail mounting 10. Dimension: 125×70×30mm 11. Weight: 114g Interface Definition:  VCC: Power input + GND: Power input DO1: Digital output channel 1 DO2: Digital output channel 2 DO3: Digital output channel 3 DO4: Digital output channel 4 DO5: Digital output channel 5 DO6: Digital output channel 6 DO7: Digital output channel 7 DO8: Digital output channel 8 DI1: Digital input channel 1 DI2: Digital input channel 2 DI3: Digital input channel 3 DI4: Digital input channel 4 DI5: Digital input channel 5 DI6: Digital input channel 6 DI7: Digital input channel 7 DI8: Digital input channel 8 A+:RS485 signal A+ B-: RS485 signal B- Applications:  PLC output expansion boards Smart Home,Home Automation,Wiser Home. PTZ CCTV cameras Security monitoring Identification systems. Motor FW & BW Automatic window control Package Included:  1*DC7-25V Digital Input/Output Module Optocoupler Isolated RS485 MODBUS RTU Communication Board