The concept of serial communication is very simple, serial by bit (bit) to send and receive bytes. Although more than by byte (byte) of parallel communication slow, but can use a serial line to send data at the same time another line to receive data. It is very simple and can achieve long-distance communications. For example, the definition of IEEE488 parallel access mode, the total line often provides equipment shall not be more than 20 meters, and between any two devices may not be more than two meters in length and in terms of the serial port, up to 1200 meters in length. Typically, serial code for the ASCII character transmission. 3 lines of communication to use to complete: (1) ground, (2) send, (3) to receive. Due to the asynchronous serial communication port to send data in a line at the same time another line to receive data. Other lines for the handshake, but not necessary. Serial communication the most important parameter is the baud rate, data bits, stop bits and parity.

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