An exclusive data acquisition method based on can bus

Abstract

The invention relates to an exclusive data acquisition method based on a CAN (Controller Area Network) bus, in particular to the multi-terminal exclusive data acquisition method based on the CAN bus. Data communication between a set of data summarization terminal and N sets of acquisition terminals is realized; the data summarization terminal and the acquisition terminals are intelligent devices; the N sets of acquisition terminals are parallelly connected onto the CAN bus through a CAN bus cable by adopting a hand-in-hand manner, and are finally connected to the data summarization terminal. The exclusive data acquisition method comprises exclusive one-to-one communication, exclusive one-to-many polling communication and urgent communication. The method with interaction of two zone sites i.e., an urgent site and a command code is designed, and the priority of a message is adjusted under different conditions, so that urgent data is transmitted and responded in real time. The exclusive data acquisition method provided by the invention is wide in application range, tens-times improved in performance, and high in real-time response to the urgent data; the more the number of the acquisition terminals is, the more obvious the technical effect of the method is.

Description

technical field [0001] The invention relates to a data acquisition method, in particular to an exclusive data acquisition method based on CAN bus. Background technique [0002] Among many field buses, CAN bus is more and more popular due to its outstanding reliability, real-time and flexibility. Correspondingly, the demand market for products based on CAN bus is expanding day by day, and its application is becoming more and more extensive. . [0003] Data acquisition is an interface technology that uses a device to collect data from the outside of the system and input it into the system. It repeatedly collects data at the same point at a certain interval (called the sampling period), and is widely used in various fields. With the rapid development of the Internet industry, data collection has been widely used in the Internet and distributed fields, bringing data collection into a new era. [0004] The periodic data collection adopts the working structure of client / server, ...

AI Technical Summary

Problems solved by technology

Its defect is: in a sampling period, the data center sends out the same command request many times, and on the CAN bus, the same acquisition terminal will receive the same command request many times, and the command processing time is added, which greatly wastes the communication bandwidth

In addition, when the collection terminal needs to send urgent data, the real-time response time of the data center is uncertain

Images