Field bus communication system based on RS485 protocol

Abstract

The invention discloses a field bus communication system based on an RS485 protocol. The system comprises an industrial personal computer core ARM, a master station, slave stations and slave station expansion sub board cards. The industrial personal computer core ARM and the master station are connected through a data bus, an address bus and a reading and writing control signal line. The master station and each slave station are connected through an RS485 communication cable to form a star network topology structure. An RS485 conversion chip is used for carrying out differential conversion on a transmitted signal between the master station and each slave station and then carrying out transmission through the communication cables. Each slave station and each slave station expansion sub board card are connected through a data bus, an address bus and a reading and writing control signal line, so that information interaction between each slave station and each slave station expansion sub board card is realized. According to the invention, the field bus communication system has the advantages of less resource consumption, simple bottom drive and the like, and has a considerable application value for an industrial automation control system.

Description

technical field [0001] The invention belongs to the field bus communication field, in particular to a field bus communication system based on the RS485 protocol. Background technique [0002] With the advancement of electronic information technology, the signal transmission mode of industrial automation control has developed from traditional analog or pulse signal transmission to digital signal transmission of field bus. The emergence of fieldbus technology has solved the problems of small transmission capacity and poor reliability of traditional communication data; secondly, the core of industrial control has gradually changed from the traditional CPU architecture with redundant resources to the simple, economical and tailorable ARM architecture, which solves the problem of traditional control Redundancy of core resources, uneconomical and other issues. Therefore, the development of fieldbus communication system for ARM-based embedded control system plays an important role...

AI Technical Summary

Problems solved by technology

The emergence of fieldbus technology has solved the problems of small transmission capacity and poor reliability of traditional communication data; secondly, the core of industrial control has gradually changed from the traditional CPU architecture with redundant resources to the simple, economical and tailorable ARM architecture, which solves the problem of traditional control Redundancy of core resources, uneconomical issues, etc.

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