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

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

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

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

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

32ch DC 12V 24V PNP NPN Input RS485 Modbus RTU PLC IO Switch Digital Collector