MICRO USB 5V 2-Channel Relay Module USB Control Relay Module serial port

DC 12V 4 Channel RS232 Relay Board PC USB UART DB9 Interface Relay Module *1

DC 5/12V 2/4/16 Channel Serial Port DB9 RS232 Relay Module Remote Control Switch

2 Channel RS232 Serial Port Relay Module DC 5V 12V DB9 Interface PC Relay

DC 12V 24V 8 CH DIN35 C45 DIN Rail Box UART RS485 Relay Module Modbus RTU Switch

DC 5/12/24V 8CH USB Serial Port Relay Module UART RS232 TTL Switch Board CH340

7-24V Modbus Rtu 1/2/4/8 Channel Relay Module Switch input output RS485/TTL UART

7-24V Modbus Rtu 1/2/4 Channel Relay Module Switch input output RS485/TTL UART