Practical Guide to Modbus Software Development PDF [83MB]

Modbus is one of the most widely used communication protocols in the field of industrial automation. With the continuous development of electronics, computers, and communication technologies, especially with the rise of concepts like the Internet of Things and “Internet Plus”, Modbus communication technology has evolved from serial buses to Modbus TCP, gaining momentum. To help students, industrial control and automation engineers, and technical personnel understand the essence of the Modbus protocol, particularly to thoroughly master the software development methods for Modbus communication technology, the author has written this book from a beginner’s perspective, gradually guiding readers through a combination of text and visuals.

This book is divided into 11 chapters, sequentially introducing the Modbus protocol, especially the definition of function code message frames. It then details the construction of debugging tools and software development environments from a software development perspective, with a focus on analyzing the source code of the libmodbus development library and development techniques using libmodbus in different programming environments. Reading this book will enable readers to quickly get started and master Modbus software development technology. As a software development guide, this book is not limited to the Modbus communication protocol and has strong reference value for software development of other communication protocols.

This book can serve as an introductory guide for software design and development for Modbus communication protocol developers in vocational colleges, engineering design institutes, system integrators, and manufacturing enterprises. It can also be used as a reference for the field of industrial automation and Internet of Things development, and is suitable for teachers, students, and enthusiasts in automation and communication fields.

Table of Contents: Chapter 1: Introduction to Modbus 1 Chapter 2: Modbus Development Environment 11 Chapter 3: Related Knowledge of Modbus Protocol 31 Chapter 4: Detailed Explanation of Modbus Function Codes 59 Chapter 5: libmodbus Development Library 101 Chapter 6: Analysis of libmodbus Source Code 111 Chapter 7: Complete RTU Mode Development Example 153 Chapter 8: Complete TCP Mode Development Example 173 Chapter 9: Using libmodbus in Visual Basic 193 Chapter 10: Using libmodbus in Visual C# 217 Chapter 11: Creating Your Own Modbus Debugging Tool 237

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