1 Introduction In 1983, the Electronic Industries Association (EIA) approved a new balanced transmission standard known as RS-485. Investigations reveal that RS-485 is highly acclaimed and has been widely applied in industrial, medical, and consumer products, becoming the dominant specification for industrial interfaces. This application report provides design guidelines for engineers who are unfamiliar with … Read more
Over 70,000 friends have followed this industrial control WeChat platform:Technical sharing,Learning exchange,Industrial control videos As industrial control professionals, it is essential for us to understand these concepts, which greatly assist in programming and data communication. RS-232, RS-422, and RS-485 are all serial data interface standards, initially formulated and published by the Electronic Industries Alliance (EIA): … Read more
Typically, we use serial ports for direct broadcasting and switching control of video servers, recorders, and switchboards, mainly utilizing RS-232, RS-422, and RS-485 interfaces. Below we will discuss the serial port interface standards, usage, and external plugins and cables. The RS-232, RS-422, and RS-485 standards only specify the electrical characteristics of the interfaces, without involving … Read more
RS-232, RS-485, and RS-422 often encounter various serial communication issues during on-site debugging, such as communication connection problems between different ports like RS-232, RS-485, and RS-422. Typically, conversion between RS-485 and RS-422 is quite convenient. However, when communicating between RS-232 and RS-422 ports, if there are no other conversion methods available on-site, and mailing could … Read more
WeChat Search Skill Training When electrical workers use PLCs, they will encounter many communication protocols and communication interfaces. Do you understand the most basic PLC serial communication and basic communication interfaces? 01 What is Serial Communication? Serial communication is a very common device communication protocol on computers (do not confuse it with Universal Serial Bus … Read more
Hello, dear students! Good evening! Today we continue to introduce the technical explanation of S7-200smart Modbus-RTU Communication V20 Inverter. Students who are interested can leave us a message for interaction~ Let’s get to the main content! PART ONE Introduction to Modbus-RTU Library Instructions Since we are using the built-in RS-485 port of the S7-200smart CPU; … Read more
Search on WeChat Technical Training Modbus is a serial communication protocol invented by Modicon for communication between PLCs and hosts. Its physical layer uses asynchronous serial standards such as RS232 and RS485. Due to its openness, it has been adopted by numerous PLC and RTU manufacturers. The Modbus communication method adopts a master-slave query-response mechanism, … Read more
This article aims to give you a clear understanding of Modbus, summarizing related knowledge about Modbus, which is very suitable for beginners. If there are any errors, suggestions and modifications are welcome. What Is a Protocol? Before understanding what Modbus is, let’s first look at what a protocol is. A protocol is a Chinese term, … Read more
Search on WeChat Technical Training When it comes to the S7-200SMART PLC, it typically uses Ethernet communication to exchange data. For instance, the Weilin touch screen now supports communication control with the 200SMART via the network port. But can the 9-pin serial port still communicate with the Weilin touch screen? The answer is definitely yes. … Read more
[Abstract] The 485 bus is often used in the wiring of common access control systems, but most people do not understand it. Below, the editor will discuss the 485 bus protocol and the related knowledge of the 485 bus transmission distance. 485 Bus Protocol 485 Bus Protocol When the communication distance is required to be… … Read more