Click the “IT Program Circle” above to select “Top Public Account”. Source: Zhang Godan’s Technical Journey Since I learned about the TCP/IP congestion control algorithm last time, I increasingly wanted to delve deeper into some underlying principles of TCP/IP. I searched a lot of information online and found a column by Tao Hui on high-performance … Read more
Brief Introduction to UDP UDP is a transport layer protocol, sitting in the same layer as the TCP protocol. However, unlike TCP, UDP does not provide features such as timeout retransmission or error retransmission, meaning it is an unreliable protocol. UDP Protocol Header UDP Port Number Many applications require the use of UDP, so it … Read more
From: Juejin, Author: Ruheng Link: https://juejin.im/post/6844903490595061767 1. TCP/IP Model The TCP/IP protocol model (Transmission Control Protocol/Internet Protocol) consists of a series of network protocols that form the foundation of the Internet and are the core protocols of the Internet. The reference model based on TCP/IP divides protocols into four layers: Link Layer, Network Layer, Transport … Read more
1. Introduction As application layer developers, the network protocol we most often encounter is typically the transport layer’s TCP (another important protocol at this layer is UDP). However, when it comes to the IP protocol, application programmers are more familiar with the concept of an IP address, and it becomes difficult to delve deeper. This … Read more
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
【Introduction】MODBUS TCP instruction V6.0 adds Modbus client function code 23, which allows reading and writing one or more holding registers from the server in a single request operation, eliminating the programming workload of polling and improving work efficiency. Join the exclusive group for electrical automation technology exchange Join the exclusive group for electrical automation procurement … Read more
This chapter mainly introduces the MODBUS TCP communication protocol and the content of free format communication protocols. 1. Overview of MODBUS TCP Communication MODBUS TCP combines the Ethernet physical network and the network standard TCP/IP with MODBUS as the application protocol standard for data representation. MODBUS TCP communication messages are encapsulated in Ethernet TCP/IP packets, … Read more
Modbus TCP is a traditional and widely used communication protocol that is supported by numerous intelligent devices. Siemens’ S7-200SMART, 1200, and 1500 series all provide free support (while the 300 and 400 series incur high fees), and they are presented in the form of a standard library, making operation quite convenient. Next, I will briefly … 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
Light Topic CC teacher shares the cornerstone coding + graphics technology explanation for live development. Tonight is the last day to sign in, don’t waste your efforts! If you complete the sign-in tonight, you can receive the full set of iOS skill expansion videos after class. Tonight at 8:30, a detailed explanation of the above … Read more