8-32 DI-DO PNP to PNP RS485 Modbus Rtu Remote IO Module DC 12-24V 300MA Output

DC 12V 8 Digital to RS485 Acquisition Switch Board Modbus RTU TTL IO PLC Module

8 Digital Input Module RS485 Modbus RTU TTL IO PLC Switch Acquisition Board

1 PCS 8 Channel 12V 24V Relay Shield Module RS485 PLC IO Expanding Board

16ch Full-duplex Transparent Transmission of Digital IO RS485 Modbus RTU Module

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R413E16 16ch RS485 RS232(TTL) PLC Modbus Rtu Module IO Control Switch Board

8 Digital Input Module RS485 Modbus RTU TTL IO PLC Switch Acquisition Board