Differential Transmission

Differences Between RS-232 and RS-485

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Differences Between RS-232 and RS-485

Ke Ruida Nationwide Service Hotline: 400-666-1916 1. Different Transmission Methods. RS-232 uses an unbalanced transmission method, known as single-ended communication. In contrast, RS-485 employs balanced transmission, i.e., differential transmission. 2. Different Transmission Distances. RS-232 is suitable for communication between local devices, with a transmission distance generally not exceeding 20 meters. RS-485, on the other hand, … Read more

Analysis of Missing Termination Resistor Phenomenon in CAN Bus

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Analysis of Missing Termination Resistor Phenomenon in CAN Bus

Source:Automotive Chassis Home Requirements for Adding Termination Resistors According to ISO11898-2 regulations on the value of termination resistors, a 120Ω termination resistor must be connected at both ends of the bus, totaling 60Ω on the bus, while intermediate nodes do not require termination resistors, as shown in Figure 1. Figure 1 Termination Resistor Effects of … Read more

Impact of Not Using Termination Resistors in CAN Bus

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Impact of Not Using Termination Resistors in CAN Bus

Before performing CAN bus communication, it is important to ensure proper bus configuration, such as termination resistors. They are crucial components that affect bus communication. Below, we will analyze the effects of not using termination resistors solely from the perspective of signal amplitude and time constant, without considering signal integrity. Termination Resistor Requirements According to … Read more

Complete Guide to RS-485 Interface Circuit Design

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Complete Guide to RS-485 Interface Circuit Design

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 different headings. 1. Why Balanced Transmission Line Standards Are Needed The focus of this … Read more

In-Depth Explanation of RS-485

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In-Depth Explanation of RS-485

(1) Introduction RS-485 is a balanced transmission standard for serial communication approved by the Electronic Industries Alliance in the United States in 1983. It only specifies the electrical characteristics of drivers and receivers without defining a protocol; therefore, many higher-level interface standards refer to RS-485 at the physical layer, such as Modbus, Profibus, etc. (2) … Read more

Understanding RS-485 Bus Simplified

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Understanding RS-485 Bus Simplified

For more information on RS-485, you can also refer to some previous articles in our series: 1. Please check out this comprehensive RS-485 beginner’s guide!2. From beginner to advanced applications! Say goodbye to using RS-485 without understanding it! 3. What projects to test with RS-485, and how to test them? ▉ Overview of RS-485 RS-485, … Read more

Detailed Overview of RS-485 Bus

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Detailed Overview of RS-485 Bus

A previous article summarized the industrial HART bus, and today we will discuss the RS-485 bus. RS-485 is a widely used communication interface, and this article will cover the key points in detail, with a length of about 5000 words. The Past and Present RS-485, what does RS mean? It stands for Recommended Standard, which … Read more

Differences Between RS-232 and RS-485

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Differences Between RS-232 and RS-485

The main differences between RS-232 and RS-485 are: 1. The transmission methods are different. RS-232 uses an unbalanced transmission method, known as single-ended communication. In contrast, RS-485 uses balanced transmission, which is a differential transmission method. 2. The transmission distances are different. RS-232 is suitable for communication between local devices, with a transmission distance generally … Read more

A Detailed Overview of RS-485 Bus

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A Detailed Overview of RS-485 Bus

Follow and StarEmbedded Inn, Exciting News Delivered Promptly [Introduction] Hello everyone, I am Yijun. In the previous article, I summarized the industrial HART bus. Today, let’s talk about the RS-485 bus. RS-485 is also a widely used communication interface. This article will discuss the key points; it is a bit long, about 5000 words. History … Read more

RS-485 Bus Overview

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RS-485 Bus Overview

RS-485 Bus Overview When the communication distance is required to be from tens to thousands of meters, the RS-485 serial bus standard is widely used. RS-485 uses balanced transmission and differential reception, thus it has the ability to suppress common-mode interference. Additionally, the bus transceiver has high sensitivity and can detect voltages as low as … Read more