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

4 PCS Mini Dc 12V 2Ch Rs485 Relay Board Modbus Rtu Switch Module Board

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VHF/UHF Radio RF UART RS485 Wireless Transceiver Board Modbus RTU Master-Slave

RYR408B 8CH DC 12V 24V Modbus Relay Module DIP Switch Set Parameters