Introduction - If you have any usage issues, please Google them yourself
UART: Universal Asynchronous Receiver/Transmitter, universal asynchronous receiver/transmitter device, UART is a parallel input into serial output of the chip, usually integrated on the motherboard, most of 16550AFN chip.
Serial interface is able to accept the characters from the CPU of the parallel data into serial data stream continuously sent, at the same time will receive the serial data stream into parallel data characters in the supply of the device CPU. General to complete the circuit of this function, we call the serial interface circuit.