ᗖR421C32 DC 12V 32 Channels Modbus RTU RS485 Bus Relay Module UART. 9 Pictures about ᗖR421C32 DC 12V 32 Channels Modbus RTU RS485 Bus Relay Module UART : 16 Channel Ethernet Relay Module With GPIO | Numato Lab, Monitoring a Relay with i2C 16×2 LCD Screen | 14core.com and also How to make a "Reed Switch Circuit" [Circuit Diagram] on Breadboard.
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