Introduction Today, let’s discuss Modbus, starting with the main content of today: 01 Terminology Interpretation 02 Background 03 Protocol Principles 04 Transmission Methods 05 Differences Between Modbus RTU and Modbus ASCII 06 Modbus TCP and Its Considerations 07 Function Code Roles 08 Security Analysis of Modbus Protocol 01 Terminology Interpretation Checksum: A checksum is typically … Read more
Modbus–The Common Language of Industrial Communication Why Do We Need Modbus? —— How the Common Language of Industrial Communication Ends the “Babel Tower Dilemma” 1. The Era Before Modbus: The “Babel Tower Dilemma” of Industrial Communication In the factory workshops of the 1970s, the dialogue between equipment was like a chaotic “Babel Tower”: Device A … Read more
When it comes to the Internet of Things (IoT), I believe everyone has some understanding, but many readers may only have a vague idea.Today, I will share content related to standards and protocols in the IoT. 1 About IoT Some readers may not know what IoT is, so this article will briefly summarize the relevant … Read more
In the field of smart hardware and the Internet of Things, the well-known ZigBee is undoubtedly recognized by everyone. Apart from Wi-Fi and Bluetooth, ZigBee is currently one of the most important wireless communication protocols, mainly used in the fields of the Internet of Things and smart hardware. The following text introduces various aspects of … Read more
In the field of smart hardware and the Internet of Things, the well-known ZigBee is recognized by everyone. Apart from WiFi and Bluetooth, ZigBee is currently one of the most important wireless communication protocols, mainly applied in the fields of the Internet of Things and smart hardware. The following text provides a detailed introduction to … Read more
1. What Is Communication To understand RS485 communication, we first need to clarify what communication is. In fact, communication is the transmission of 0 and 1 codes between two devices, where 0 represents low level and 1 represents high level. If device A transmits data to device B, then device A and device B must … Read more
Today, I will share with you some common knowledge points about TCP network, which you will often encounter in daily work or interviews. Considering the length of the content, I suggest you bookmark it and digest it slowly. If it helps, please share it with your friends; “It’s better to enjoy together than to enjoy … Read more
Author: Xiao Tuda, Editor: Emperor Capital Sheep https://wdxtub.com/2017/04/02/http-guide/ The HTTP specification is a standard that we should follow when developing web-related projects. Here, I record the basic knowledge and common usage that I find useful. 0 Introduction to HTTP The HTTP protocol (HyperText Transfer Protocol) is the most widely used network transmission protocol on the … Read more
The HyperText Transfer Protocol (HTTP) is a stateless protocol that operates at the transport layer of the OSI seven-layer model. The HTTP client constructs appropriate HTTP request methods as needed, while the HTTP server responds differently based on various HTTP request methods. 1. HTTP Versions and HTTP Request Methods Throughout the development of HTTP, many … Read more
HTTP is an object-oriented protocol belonging to the application layer. Due to its simplicity and speed, it is suitable for distributed hypermedia information systems. It was proposed in 1990 and has undergone continuous improvement and expansion over the years. Currently, HTTP/1.0 version 6 is in use on the WWW, while the standardization work for HTTP/1.1 … Read more