Function: 1. Input and Output Channels: Features 8 channels of opto-isolated digital input with NPN low-level input, and 8 channels of triode digital output with ULN2803 NPN output, each with a maximum load current of 300MA. 2. Lightning Protection and Anti-interference: The module can be networked with configuration software, PLC, or industrial touch screen, with communication circuits designed for lightning and anti-interference protection. 3. Communication Protocol: Utilizes RS485 RTU standard communication protocol. 4. Mounting Method: Standard DIN rail mounting for easy and simple installation. 5. Wide Application: Suitable for signal acquisition and control in industrial fields, smart homes, home automation, security monitoring, or identification systems. Specification: Item Type: Optocoupler Isolation Input Output Control Board Material: ABS Working Voltage: DC7-25V (9V 12V 24V) Operating Current: 8-50MA Features: RS485 communication isolation protection 3000VDC, DI digital input port isolation protection 3000VDC, standard RTU commands (function codes 05 06 15 16 write, 01 02 03 read). Baud Rate: 1200 2400 4800 9600 (default) 19200 38400 57600 115200 Parity Bit: None (default), Even, or Odd Installation: Standard DIN rail mounting Size: Approx. 125 x 70 x 30mm / 4.92 x 2.76 x 1.18in. Package List: 1 x Optocoupler Isolation Digital Input Module Note: Triodes only have 'high resistance' and 'on' states; output levels cannot be measured with a multimeter.