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The RXD (Receive Data) and TXD (Transmit Data) pins are typically used in serial communication protocols like UART. RXD is the pin where the device receives incoming data, while TXD is the pin used to send outgoing data. In most configurations, RXD is connected to the TXD pin of another device and vice versa to establish a communication link. The specific pin assignments can vary depending on the hardware and connectors used.

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