RS-485, with its excellent ability to resist common mode noise, is suitable for long-distance signal transmission, especially widely used in industrial environments. This article introduces the working principle of RS-485 and the EMI risks it faces (electrostatic interference, electrical fast transient bursts, and surge voltage), and discusses several EMC solutions that help RS-485 cope with … Read more
Among the various solutions for medium to long-distance communication between MCUs, RS-485 is widely used in factory automation, industrial control, community monitoring, and water resources automatic reporting due to its simple hardware design, ease of control, and low cost. However, RS-485 bus still has defects in anti-interference, adaptability, and communication efficiency. Improper handling of some … Read more
With the popularization of the concept of “carbon neutrality”, industries such as photovoltaics, wind power, and energy storage are once again ushering in a boom. As a commonly used communication interface in these industries, RS-485 often requires additional protection circuits to ensure stable communication. This article will introduce a protection circuit scheme for multi-node environments. … Read more
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
Table of Contents 1. Key Technical Features of RS-485 2. Application Scenarios 3. Standards 4. Advantages of Using Differential Signal Transmission 5. Similarities and Differences Between RS-422 and RS-485 5.1 Differences in Bus Architecture 5.2 Differences in Common Mode Voltage Range 5.3 Differences in Input Impedance of Receivers 5.4 RS-485 Transceivers with Enable Pins 6. … Read more
Hidden Costs of Isolated RS-485 Optocoupler Design Optocouplers, also known as optical isolators or optoelectronic couplers, have been used for over 40 years to achieve current isolation in electronic circuits. Optocouplers use LEDs and phototransistors to communicate signals without transmitting current. As a low-cost solution, optocouplers have remained popular. But considering the advancements in digital … Read more
Follow+Star Public Number, don’t miss wonderful content Source | Zhou Ligong The RS-485 bus is widely used in communication, industrial automation, and other fields. In practical applications, it is often encountered whether to add pull-up and pull-down resistors and what size of resistors is appropriate. Below we will analyze these issues in detail. Why are … Read more
01 【Common Ground】 RS-232, RS-422, and RS-485 all belong to UART, which stands for Universal Asynchronous Receiver/Transmitter. They can complete the communication process using only two signal lines (Rx and Tx); However, due to the different voltage levels used by each, when converting from UART to RS-232, RS-422, or RS-485, a chip such as SP3232E … Read more
BFH Click the blue text to follow us↑↑↑↑ RS-485 is a wired transmission, so it requires a hardware transmission medium, which is essentially just two wires. The actual signal transmitted on these two wires is the same; the sender splits this signal into two, but at the receiving end, it is restored to its original … Read more
