1. What is MODBUS? 1. Basic Concepts MODBUS is a communication protocol initially advocated by MODICON (now a brand of Schneider Electric). It has gradually been recognized as a standard communication protocol through practical applications by most companies. As long as data communication or transmission is conducted according to this protocol, different systems can communicate … Read more
Hello everyone, today we will discuss the principles of RS485 communication, why matching resistors need to be added when the communication line is long, how to add them, how to adjust the value of the matching resistors, their impact on the output waveform, and why matching resistors should be added at both ends, among other … Read more
Search on WeChat Technical Training Source of the Pitfall: Poor Load Capacity of Passive RS232 to RS485 Converters If you are an industrial control engineer and often deal with communications, you will inevitably encounter the issue of poor driving capability of passive RS232 to RS485 converters. Previously, I worked on a product in a small … Read more
In RS485 communication systems, the choice of grounding method is crucial, directly affecting the system’s stability and anti-interference capability. Therefore, engineers need to choose the grounding method reasonably based on project requirements. Below we will discuss which grounding is suitable for the RS485 bus. 1. Single Point Reliable Grounding There can only be one grounding … Read more
The RS485 bus has advantages such as simple structure, long communication distance, fast communication speed, and low cost. It is widely used in industrial communication, power monitoring, instrumentation, and other industries. Due to the harsh industrial control environment, more interference coupling can occur in communication lines, affecting the reliability of the RS485 bus, and even … 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
Click the above “Follow Electronics” for easy learning of electronic knowledge. Follow Electronics Subscription Account Daily updates of technical articles in the electronics industry and the latest information on microcontrollers, making it easy to learn anytime, anywhere. <RS232 and RS422 Interface Circuits> 1. RS-485 The RS-485 bus is widely used when communication distances range from … Read more
Today, I will share with you some common interfaces and communication protocols of Siemens PLC. The first major question: The difference between RS232 and RS485 interfaces 1. Physical structure of interfaces 1. RS232 interface: One of the computer communication interfaces, the RS-232 interface typically appears in the form of 9 pins (DB-9) or 25 pins … Read more
1 The Origin of Serial Ports The serial port emerged around 1980, with data transmission rates ranging from 115kbps to 230kbps. Initially, the serial port was designed to connect computer peripherals, such as mice, external modems, old cameras, and graphics tablets. It can also be used for interconnecting two computers (or devices) for data transmission. … Read more