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

DC 12V 24V 8AI-8DI-8DO Expansion Board RS485 Analog Collection Wifi Relay Switch

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

DC 12V 24V 8ch Multifunction Delay Timer RS485 Modbus Relay Module

8 16 24 32 48CH Multifunction RS485 Remote IO Module PLC DI-DO expansion Board

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

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

DC 12V 433M Wireless RS485 IO Point-to-Point Master-Slave RF Transceiver