Introduction PLC comes in various sizes, hence its control range can also vary. Smaller PLCs might only control a single device, or even a component at a site; larger ones can control multiple devices, an entire production line, or even an entire factory. It can be said that PLCs are indispensable in both large and … Read more
1. Used for Discrete Control The ability of PLC to control discrete signals is very strong. The number of input and output points can range from a few dozen to several hundred, even thousands or tens of thousands. Because it can be networked, the number of points is almost unlimited, and it can control any … Read more
The RS485 interface consists of a half-duplex network, typically using a two-wire system, often employing shielded twisted pair cables for transmission. This wiring method allows a maximum of 32 nodes to be connected on the same bus in a bus topology. Initially, data was output as an analog signal for simple process quantities, and later, … Read more
In engineering, the RS485 control line is often mentioned. What exactly is it? Today, let’s discuss the applications related to RS485. By delving deeper into RS485, you will find that there is indeed a lot of knowledge involved. We will choose some common issues that need to be considered in weak current systems for everyone’s … Read more
Bluetooth is a term we are all too familiar with, from Bluetooth headphones, Bluetooth mice, to Bluetooth speakers… Bluetooth is closely related to our lives. But what exactly is Bluetooth? This story begins with a Danish king Bluetooth is actually a short-range wireless communication technology, an open global standard for wireless transmission of voice and … Read more
Background The HTTP protocol is a stateless protocol, meaning each request is independent of others. Therefore, its initial implementation was to open a TCP socket connection for each HTTP request, which would be closed after the interaction was complete. HTTP is a full-duplex protocol, so establishing and closing connections requires three-way handshakes and four-way handshakes. … 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
Who invented the Internet?? Nowadays, whether we are working or living, it seems we can’t live without the Internet! No matter where we go, we always ask for the WIFI password first! Have you ever thought about who invented the Internet?? Tim Berners-Lee (Born in 1955 in the UK) is the inventor of the World … 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