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This RS232 shield is designed for the Arduino controller,and it can easily convert UART to RS232 interface.
RS485 is an industrial standard for long dsitance, anti-interferrence and reliable communication. So we create this RS485 Arduino shield, especially designed for the Arduino controller board. It converts UART/Serial protocol to RS485 protocol. This board allows Arduino access to industrial standard protocol easily.
Allows your Smoothieboard to work without requiring a USB cable for logic power.