Today’s computer network interview question has been asked by major companies such as ByteDance, Meituan, and Tencent, making it quite common. Before HTTP/3.0, it was based on the TCP protocol, but HTTP/3.0 will abandon TCP in favor of the UDP-based QUIC protocol: HTTP/1.x and HTTP/2.0: Both versions of the HTTP protocol are explicitly built on … Read more
Abstract ❝ This article builds upon the previous one by adding the functionality to read and write int and float data, as well as byte order reading and writing functions (ABCD, BADC, CDAB, DCBA)【Project address at the end of the article】. Introduction Today, we will discuss how to add new features to the previous article … Read more
This article discusses the conversion from Modbus TCP to Profinet in a master-slave configuration. The process involves understanding the communication protocols and ensuring compatibility between devices. To implement this conversion, you will need to configure the Modbus TCP settings on the master device and set up the Profinet parameters on the slave device. This includes … Read more
1. Introduction to HTTP HTTP (Hypertext Transfer Protocol) is an application layer protocol used for transmitting hypertext (such as HTML files) over the network. It is based on the TCP/IP protocol and serves as the foundation for data communication on the World Wide Web. Below, we will detail HTTP from multiple aspects. 2. Development History … Read more
In internet communication, TCP (Transmission Control Protocol) and HTTP (Hypertext Transfer Protocol) are both key protocols, but their roles and applicable scenarios are completely different. Many people may be confused: 1. Since TCP can already transmit data, why do we need HTTP? 2. When should we use TCP directly, and when should we use HTTP? … Read more
VxWorks is a real-time operating system (RTOS) widely used in embedded systems. Due to its high performance and reliability, it has been extensively applied in many critical fields such as aerospace, industrial control, and automotive electronics. This article will briefly introduce network programming on VxWorks, focusing on how to perform network communication and providing some … Read more
Click the little blue text to follow! Practical Troubleshooting of PLC Instruction Tables in Data Acquisition Last Friday, the newly installed automated production line in the workshop suddenly alarmed and stopped. Xiao Wang hurried over to find me. “Master Li, the main control computer shows no data, the program is still running but no production … Read more
Concept HTTP Short Connection (Non-persistent Connection): A TCP connection is established for each HTTP request-response, and it is immediately closed after completion. HTTP Long Connection (Persistent Connection): Multiple HTTP requests and responses can be sent continuously over the same TCP connection, which remains open for a period of time, allowing the reuse of that connection … Read more
Having worked in the industrial control industry for over a decade, today I will guide you step-by-step on how to use the IoT gateway to achieve PLC remote monitoring, eliminating the need to hire someone to debug the equipment on-site! 1. Hardware Connection Core Devices: PLC (taking Siemens S7-1200 as an example), 4G IoT gateway … Read more
Basic Concepts HTTP (HyperText Transfer Protocol) is an application layer protocol used for distributed, collaborative, and hypermedia information systems. In simple terms, it is a method for publishing and receiving HTML pages, used to transfer information between web browsers and web servers. HTTP operates by default on TCP port 80, and websites accessed with http:// … Read more