Serial interface is abbreviated as serial port, also called serial communication interface or serial communication interface (usually referred to as COM interface), which is an extended interface using serial communication. Serial Interface refers to the sequential transmission of data bit by bit. Its characteristic is that the communication line is simple, as long as a pair of transmission lines can achieve two-way communication (the telephone line can be directly used as the transmission line), which greatly reduces the cost, and is especially suitable for long-distance communication, but the transmission speed is slow.
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