Modbus RTU 4-way relay module 12V 4-way switch input optocoupler isolation RS485

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

Modbus RTU 4-way relay module 12V 4-way switch input optocoupler isolation RS485

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

8 Channels DC 12V RS485 / TTL Relay Module Modbus Rtu 485 Control Switch

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

4-ch Modbus-RTU Relay Switch Module Signal input and output RS485 TTL Controller