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

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

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

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

DC7 -24V Modbus Rtu 4 Channel Relay Module Switch input output RS485/TTL UART

Modbus-RTU 1/2 Channel DC7~24V Control Switch Relay Module RS232 TTL UART

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

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