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The difference between serial port and parallel port

The difference between serial port and parallel port



Serial parallel port is the common name of the input and output connection socket, which is located on the motherboard. The printer can be used as a parallel output port, and a serial input / output port is used to communicate with other computers. Parallel port is almost 25 hole Yin socket, the serial port is 9 pin or 25 pin Yang socket.


Serial port, which is called COM interface, is an extended interface using serial communication protocol. The serial port appeared in about 1980, and the data transmission rate is 115kbps~230kbps. Serial ports are commonly used to connect the mouse and the external Modem, as well as the old camera and tablet and so on. Now some new motherboards have begun to cancel this interface.



Parallel port, which is called LPT interface, is an extended interface using parallel communication protocol. The data transmission rate of parallel port is 8 times faster than that of serial port, and the data transmission rate of standard parallel port is 1Mbps. Parallel port is commonly used to connect printers, scanners and so on. So parallel port is also called "print port".


The difference between parallel port and serial port is different in the way of exchanging information. A parallel port can transmit information through 8 data lines at one time, one byte at a time, but a serial port can only transmit one bit of data with 1 lines, one byte per time. The parallel port can transmit more information at the same time, so the speed is obviously higher than the serial port, but the serial port can be used for data transmission farther than the parallel port.