The communication method in which the data of one piece of information is transmitted in turns by bit is called serial communication. The characteristics of serial communication are: data bit transmission, transmission in bit order, at least one transmission line can be completed; low cost but slow transmission speed.According to the direction of information transmission, serial communication can be further divided into simplex, half-duplex and full-duplex.
Parallel interface refers to the interface standard that uses parallel transmission to transmit data. From the simplest parallel data registers or dedicated interface integrated circuit chips such as the 8255, 6820, etc., to the more complex SCSI or IDE parallel interfaces, there are dozens. The interface characteristics of a parallel interface can be described in two aspects: 1. The width of the data channel transmitted in parallel, also known as the number of bits transmitted by the interface; 2. The additional interface control line or interaction used to coordinate parallel data transmission The characteristics of the signal.
Comparison of Serial Interface and Parallel Interface
1)Surface difference: The socket of the serial port is generally a needle, and the socket of the parallel port is a pinhole. The most obvious difference is the serial port COM port and the parallel port printer port on the computer.
2)The information transmission mode is different:Serial cable only can be transmitted by a single line, and the parallel port can be transmitted by multiple lines.
3)Parallel port transmiss faster than the serial port.
4)the serial port is farther than the parallel port transmission.
