RS 485

Unveiling the Core Mechanism of RS-485 Communication: The Key Role and Implementation Principle of 120Ω Termination Resistors

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Unveiling the Core Mechanism of RS-485 Communication: The Key Role and Implementation Principle of 120Ω Termination Resistors

Common “Difficulties” in the Field One of the most troublesome issues during device debugging: RS-485 communication is unstable, with intermittent data transmission. The program logic is fine, the cable connections are correct, and there are no address conflicts, yet communication timeouts, data corruption, and sporadic failures still occur. Changing cables, adjusting baud rates, and checking … Read more

The Golden Partner of RS-485

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The Golden Partner of RS-485

‖ System Learning Life is like a marathon; sometimes you need to pause and take a breather to go further. Why does Modbus RTU always appear with RS-485? What is RS-485? Before we dive into this issue, let’s first understand what RS-485 is, which you may have heard of but not fully grasped.In official terms:RS-485 … Read more

Relationship Between USB Transfer Rates and RS-232/RS-485 Serial Protocol Rates

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Relationship Between USB Transfer Rates and RS-232/RS-485 Serial Protocol Rates

1. Technical Background RS-232: Traditional serial port standard, typical rate 115.2 kbps (maximum about 1 Mbps). RS-485: Industrial serial port standard, typical rate 10 Mbps (theoretical maximum can reach 50 Mbps). USB: There are significant differences between different versions, for example: USB 2.0:480 Mbps USB 3.0:5 Gbps (about 5120 Mbps) USB 4.0:40 Gbps 2. Comparison … Read more

What Are the Technical Specifications Requirements for RS-485 Bus Technology?

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As an important standard in the field of industrial communication, the technical specifications of RS-485 bus technology directly determine the stability, anti-interference capability, and transmission efficiency of the system. The following is a comprehensive analysis of the technical requirements of RS-485 from the aspects of electrical characteristics, mechanical structure, protocol specifications, and practical applications. 1. … Read more

Why Modbus RTU Always Appears with RS-485?

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Why Modbus RTU Always Appears with RS-485?

In the field of industrial communication, Modbus RTU and RS-485 are often mentioned together. Many people mistakenly believe they are the same thing, but in reality, these two concepts are entirely different; they are simply used in close conjunction in industrial control. What is RS-485? RS-485 is a physical layer communication standard that defines how … Read more

In-Depth Analysis of MODBUS Protocol: Understanding Serial Communication Transmission (What are the Differences Between MODBUS RTU and MODBUS ASCII?)

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In-Depth Analysis of MODBUS Protocol: Understanding Serial Communication Transmission (What are the Differences Between MODBUS RTU and MODBUS ASCII?)

Click to follow and stay on track in your learning journey! Last time, we delved into the core elements of the MODBUS protocol. I wonder if you have memorized those key points and successfully established a foothold in the world of MODBUS? If you haven’t fully digested the information yet, make sure to review it … Read more

How to Select TVS Diodes for RS-232, RS-485, and CAN Based on Rated Voltage

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How to Select TVS Diodes for RS-232, RS-485, and CAN Based on Rated Voltage

In many industrial and automotive applications, protecting interface transceivers from various electrical overstress events is a major concern. Transient Voltage Suppressor (TVS) diodes are commonly used for this purpose as they can clamp voltage spikes by creating a low-impedance current path. The electrical characteristics of TVS diodes are determined by several process factors. These parameters … Read more

Complete Guide to RS-485 System Design

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Complete Guide to RS-485 System Design

【Motor Drive | 5G RF | Signal Conditioning | Circuit Design | Power Supply Design | Circuit Layout | High-Speed Interfaces】Join the AI Robot group to access the above practical technical documents, and interact with industry peers👆👆👆The purpose of this application report is to introduce the key aspects of RS-485 system design, providing a comprehensive … Read more

Common Communication Protocols in Power Systems: RS-232 as a Country Road, RS-485 as a Highway? A Systematic Discussion of Their Differences!

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Common Communication Protocols in Power Systems: RS-232 as a Country Road, RS-485 as a Highway? A Systematic Discussion of Their Differences!

In the previous article, we discussed the differences between Modbus and RS-485, which belong to different layers. If we use a language analogy, then Modbus determines which “language” to use, while RS-485 and RS-232 determine the method of communication, such as face-to-face or telephone communication. In this article, we will discuss the differences between RS-485 … Read more

Complete Guide to RS-485 Interface Circuits: Everything You Need to Know

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Complete Guide to RS-485 Interface Circuits: Everything You Need to Know

This design guide discusses how to design RS-485 interface circuits. It covers the necessity of balanced transmission line standards and provides an example of process control design. The article also discusses line loading, signal attenuation, failure protection, and current isolation under separate headings. 1. Why Balanced Transmission Line Standards are Necessary The focus of this … Read more