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

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

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

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

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

RS232 Relay Board 2CH DC 12V/24V Serial Port Switch Module for PLC Motor LED PTZ

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