Serial communication and parallel communication

Explanation of serial communication and parallel communication

Serial communication: data bits are sent one data bit after another, and the data bits represent 0 or 1

Parallel communication: sending 8 data bits at a time, which is one byte,

Comparison between serial communication and parallel communication

Basic terminology of serial communication

Serial communication method

ASCII code

Baud rate, parity bit, data bit, stop bit

Synchronous communication and asynchronous communication

DTE and DCE

RS-232

RS-485

RS-422

Serial communication method

simplex mode

half duplex mode

Full duplex mode

The difference between serial and parallel is as follows:

1. The data transmission methods are different: the serial port transmission method is that the data is arranged in a line and sent out and received one by one, and the parallel port transmits 8-bit data and is sent out at one time.

2. The pins are different: there are fewer serial port pins and more parallel port pins.

3. Different uses: The serial port is now only used as a control interface, while the parallel port is mostly used as an interface for printers, scanners, etc.

4. Parallel data transmission uses the computer’s word length, usually 8 bits, 16 bits, and 32 bits as the transmission unit, and transmits one word length of data at a time. It is suitable for short-range information exchange between external devices and the CPU. At the same frequency, the efficiency of parallel port transmission is several times that of the serial port.

5. Serial transmission, or serial communication, refers to using a data line to transmit data bit by bit, and each bit of data occupies a fixed length of time. It only requires a few lines to exchange information between systems, and is especially suitable for long-distance communication between computers and computers and peripheral devices.

The above is the relevant introduction to ” serial communication and parallel communication “.