Tip:Click above“Ba Fang Hui PLC Practical Programming Training“↑Follow us for free RS485is a wired transmission, which requires a hardware transmission medium, essentially just two wires are sufficient. The actual signal transmitted over these two wires is the same signal; the sending end splits this signal into two, but at the receiving end, it is restored … Read more
BFH Click the blue text to follow us↑↑↑↑ The RS-485 interface forms a half-duplex network, typically using a two-wire system, often employing shielded twisted pair for transmission. This wiring method allows a maximum of 32 nodes to be connected on the same bus topology.Initially, data was output as analog signals for simple process quantities, later … Read more
This article introduces the basic concepts of the serial communication protocols RS-232, RS-422, and RS-485, including baud rate, data bits, stop bits, parity bits, and handshaking information. 1. What is Serial Port? The concept of serial communication is quite simple. Serial ports send and receive bytes one bit at a time. Although it is slower … Read more
(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
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
In industrial control, power communication, and smart instrumentation, data exchange often relies on serial communication. Initially, the RS232 interface was the mainstream choice; however, due to the complexity of industrial sites, various electrical devices generate electromagnetic interference that can lead to signal transmission errors. In 1979, Schneider Electric designed and launched a bus protocol specifically … Read more
Follow+Star Public Account, don’t miss wonderful content Author | strongerHuang WeChat Public Account | Embedded Column Recently, some friends asked about Modbus issues. This article briefly describes some common problems with Modbus. You may not know what Modbus is. In fact, Modbus is widely used in real life and is present in almost all industrial … Read more
This article provides an in-depth study of the Modbus RTU protocol. Background Before introducing Modbus RTU, we can understand that Modbus was invented by Schneider Electric in 1979 and is the first truly industrial bus protocol used in the field. More than forty years later, it is still widely used in various industrial control fields. … Read more
Hello everyone, I am Mai Ge. I previously wrote an article about the modbus protocol, which was just a simple introduction. In this article, we will delve deeper into the modbus RTU protocol. 1. Background Before introducing modbus rtu, we can understand that Modbus was invented by Schneider Electric in 1979 and is the world’s … Read more
1. Why Is Serial Communication So Popular? When working on microcontroller products, the most commonly used method is serial communication. For any microcontroller peripherals, the priority is to choose those with serial port functionality, such as Bluetooth modules, WIFI modules, 4G modules, electric meters, and displays. Why Is Serial Communication So Popular? Because it’s simple! … Read more