Table of Contents Introduction: Why Has Modbus Survived for 40 Years? The Historical Background and Development of Modbus 2.1 Birth Background 2.2 Evolution 2.3 Why Has Modbus Not Been Phased Out? Modbus Protocol Architecture 3.1 Basic Architecture 3.2 Data Model Three Major Modbus Variants: RTU / ASCII / TCP 4.1 Modbus RTU (Most Classic and Common) 4.2 Modbus ASCII (Early Version) 4.3 Modbus TCP (Ethernet Version) Modbus Frame Structure and Function Code Details 5.1 Modbus R

Table of Contents Introduction: The Communication Backbone of the Smart Grid Era Overall Architecture of Smart Substation Communication Systems: Protocols and Standards  2.1 Comparison of the Three-Layer Architecture  2.2 Communication Media and Redundancy Design 2.3 Comparison Between Traditional and Smart Substation Architectures Key Communication Links and Data Flows: Real-Time Performance and Big-Data Analytics  3.1 Data Flow Path 3.2 Performance Improvements Power Commun

Table of Contents Why Chip Architecture Matters for Industrial Routers Chip Architecture Selection by Application Scenario 2.1 Low-Cost IoT and Edge Access 2.2 General Industrial Routing and 5G/Edge Computing 2.3 High-Performance Enterprise and Virtualization Scenarios 2.4 AI-Driven and Intelligent Analytics 2.5 High-Flexibility and Customized Scenarios Application-Oriented Comparison Table Classic Architectures: The Foundation of Industrial Routers 4.1 MIPS 4.2 ARM 4.3 x86 E