12 DIO Ethernet/RS485 Relay Module Modbus RTU TCP/IP Network PLC Expansion Board

12DIO Ethernet/RS485 Relay Module Modbus RTU TCP/IP Network PLC Expansion Board

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16CH 12V Modbus RTU RS485 Relay Module Switch Board for PLC Lamp LED PTZ Camera

DC12V/24V 20Ch RS485 Relay Board 20DO 2DI 2AI PLC IO Expanding Module Modbus RTU

RS485/TCP Modbus Slave Relay Control Module DC 12V 8 CH Ethernet Network ET48A08