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

Industrial Grade 4DO RS485 Relay Module DIP Switch Set Parameters Modbus RTU

DC 12V 24V 1CH 3A Small Relay Board RS485 UART Serial Port Switch MODBUS RTU

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

3 IN 1 Serial Serve/Ethernet/RS485 Relay Module Modbus Network Controller Switch

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

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