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

Modbus-Rtu 1/2 Channel Relay Module Modbus RTU Switch RS232 TTL UART DC7V-24V

4/8 Channel ESP32 RS485 Modbus WIFI Bluetooth Relay Optocoupler Isolation Module

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

8Ch Eingang/ Ausgabe Digital Ttl Lvttl Cmos Rs485 Io Control Module Modbus4978

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

2 Channel DC12V RS485 Modbus RTU Relay Module PLC Digital Output Expansion Board

DC 12V 24V 8CH DIN35 C45 UART RS485 Relay Module Modbus RTU Control Switch Board