A serial communication method

Abstract

A serial communication method, in which the devices participating in the data communication conduct data communication through an electrical signal wire, and when the data is transmitted between the communication devices, one of the high and low levels is used as a synchronous signal, and the other is used as a synchronous signal. Data signal, each synchronous signal pulse is followed by a one-bit data signal pulse, the actual logic value transmitted is identified by the difference in the data signal pulse width, the data stream is based on the data bit as the basic unit, serial transmission, the communication process is master-slave One-way communication mode, compatible with master-slave two-way communication, and can complete point-to-point communication and point-to-multipoint communication at the same time, this communication method is simple, especially suitable for data exchange between communication devices with unstable communication frequency Communication environment with one signal line, low cost, stable and reliable communication.

Description

Technical field: [0001] The invention relates to a serial communication method, which is suitable for data exchange between communication devices, especially for data exchange between communication devices with unstable communication frequency. Background technique: [0002] With the development of technology and the improvement of people's living standards, data communication exists in all aspects of daily life, but the usual serial communication has high requirements for the accuracy of the system clock. Once the communication frequency of the two parties deviates, it will lead to communication failure. At present, the mainstream single-chip microcomputers all have built-in RC oscillators. Due to the reasons of the RC oscillator itself, there are problems of low precision and poor stability. In order to achieve a stable clock, each device usually needs to add an external oscillator instead of a single-chip microcomputer. The built-in RC oscillator is used as the system clo...

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Problems solved by technology

[0002] With the development of technology and the improvement of people's living standards, data communication exists in all aspects of daily life, but the usual serial communication has high requirements for the accuracy of the system clock. Once the communication frequency of the two parties deviates, it will lead to communication failure. At present, the mainstream single-chip microcomputers all have built-in RC oscillators. Due to the reasons of the RC oscillator itself, there are problems of low precision and poor stability. In order to achieve a stable clock, each device usually needs to add an external oscillator instead of a single-chip microcomputer. The built-in RC oscillator is used as the system clock source, which will increase the cost of equipment and bring new failure points. At the same time, adding external oscillator components will increase the size of the electronic circuit board, but some equipment, such as smart water meters, The location for circuit board installation is very small, and it is difficult to install the external oscillator components into the meter; moreover, at least two communication lines are required to connect the two communication parties, which also brings design difficulties to equipment with few resources, which not only increases the cost , and the difficulty of assembly and design will inhibit the promotion and use of this type of product

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