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Design and Application of Communication Device for RS485 Bus Based on Modbus Protocol

Xiaoyun Liu

Open publisher page 1 citations

Abstract

The paper discusses the design principle and application of structure of main and slave based on Modbus protocol in details.The physical configuration include PC、 the main station、slave station nodes.The main station,working between the PC computer and the slave station nodes,does the polling work once accomplished by the PC computer so as to improve the RS485 bus.It releases the PC computer from busy polling tasks;the independence of the system can be improved,and it is faster for the system to recover from the failure;The software inspect based on Modbus protocol and the accession of CRC checking,thus,the reliability and safety of the system are improved effectively.This design has been successfully applied in a prison access control system.

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What this paper is about

The paper discusses the design principle and application of structure of main and slave based on Modbus protocol in details.The physical configuration include PC、 the main station、slave station nodes.The main station,working between the PC computer and the slave station nodes,does the polling work once accomplished by the PC computer so as to improve the RS485 bus.It releases the PC computer from busy polling tasks;the independence of the system can be improved,and it is faster for the system to recover from the failure;The software inspect based on Modbus protocol and the accession of CRC checking,thus,the reliability and safety of the system are improved effectively.This design has been successfully applied in a prison access control system.

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OpenAlex reports 1 citations for this work. Citation counts describe recorded attention and do not establish research quality.

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Available abstract

The paper discusses the design principle and application of structure of main and slave based on Modbus protocol in details.The physical configuration include PC、 the main station、slave station nodes.The main station,working between the PC computer and the slave station nodes,does the polling work once accomplished by the PC computer so as to improve the RS485 bus.It releases the PC computer from busy polling tasks;the independence of the system can be improved,and it is faster for the system to recover from the failure;The software inspect based on Modbus protocol and the accession of CRC checking,thus,the reliability and safety of the system are improved effectively.This design has been successfully applied in a prison access control system.

Key concepts: Modbus, Polling, Embedded system, Protocol (science), Reliability (semiconductor), Software, Communications protocol, Computer science

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