Serial interface? (serial interface) refers to the sequential transmission of data bit by bit, which is characterized by
Serial port is a simple communication line, which can realize two-way communication only by a pair of transmission lines (telephone lines can be directly used as transmission lines), which greatly reduces the cost and is especially suitable for long-distance communication, but the transmission speed is slow. The communication mode in which each bit of information is transmitted bit by bit in sequence is called serial communication. The characteristics of serial communication are: the transmission of data bits is carried out in bit order, and at least one transmission line is needed; Low cost but slow transmission speed. The distance of serial communication can be from several meters to several kilometers; According to the transmission direction of information, 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 special interface integrated circuit chips such as 8255, 6820, etc. , to more complex SCSI or IDE parallel interfaces, there are dozens. The interface characteristics of parallel interface can be described from two aspects:
1, the width of data channel for parallel transmission, also known as the number of bits for interface transmission;
2. Characteristics of additional interface control lines or interactive signals used to coordinate parallel data transmission. The width of data can be from 1 to 128 bits or more, of which 8 bits are the most commonly used, and 8 data bits can be transmitted at a time through this interface. The most commonly used parallel interface in computer field is LPT interface.