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“Sometimes we need to connect Arduino boards located far away from each other. The RS485 is a very convenient way to connect the boards with just 2 wires, and can work to a distance of 1200m (4000 ft). It also allows multiple boards to be connected easily to the same 2 wires. The downside is that the channel is shared between multiple devices, and only one of them can transmit at a time.”

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