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UART stands for universal asynchronous receiver / transmitter and is a simple protocol consisting of a single wire for data reception and a separate single wire for data transmission. These two wires along with a ground connection (used to determine a digital low value in data) are the general requirements for a full connection (with both receiving and transmitting) to a UART debug header.
- GND - Ground connection, required for good TX/RX.
- TX - This is the transmission line.
- RX - This is the receiving line.
- VCC - Connection power (generally left unconnected).