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

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

8-24CH 4-20MA To RS485 Current Analog Input Collector Module MODBUS RTU Board

2 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 5V 12V 24V 8CH RS485 Modbus Rtu HMI Remote IO Expanding Board

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

DC 12V 24V PLC IO Expanding Board 4-20MA 0-10V Analog Current Voltage Collector