1. Quick Ways to Learn Modbus 1.1 Register Mnemonics As a beginner, one might find the concepts of the Modbus protocol awkward, repetitive, and hard to distinguish, such as Coil Status, Discrete Input Status, Holding Register, and Input Register. Returning to the essence of the matter, in the field of industrial control PLC, it involves … Read more
Recently, I needed to use the 51 microcontroller for some control tasks in a project. The main function is to receive commands from the host computer through the serial port, analyze and decode them, and wait for an external trigger signal to execute the previously received command actions. Fortunately, I had an STC89C52 on hand, … Read more
Search on WeChat Technical Training 1. Description of Case Task Control Requirements The Serial Port Debugging Assistant is a software based on the Windows system: 1. Supports TCP, UDP, and Serial Port 2. Supports domain name resolution for addresses 3. Allows creating multiple connections of the same type 4. Periodic sending, hexadecimal display, automatic line … Read more
Below is a detailed introduction on how to use virtual serial ports to debug serial sending and receiving programs. Three software programs are needed: KEIL, VSPD XP5 (virtual serial ports driver xp5.1), and Serial Debug Assistant (I personally find version 2.1 quite user-friendly). 1. First, compile the written program in KEIL. 2. Open VSPD, the … Read more
Click the blue text above to follow for continuous updates!!! Introduction Today, we will also not involve the Zigbee protocol, focusing solely on serial operations in the CC2530 microcontroller. This article uses Serial Port 0 for data transmission. The main function is to send serial data from a PC’s serial debugging tool to the microcontroller, … Read more
[Abstract] The 485 bus is often used in the wiring of common access control systems, but most people do not understand it. Below, the editor will discuss the 485 bus protocol and the related knowledge of the 485 bus transmission distance. 485 Bus Protocol 485 Bus Protocol When the communication distance is required to be… … Read more
In bus systems, both RS-485 and CAN-bus are commonly used buses, each with unique characteristics and application scenarios, widely applied. Today, let’s discuss their differences. 1. What is RS-485? RS-485 is a serial communication protocol that has been around since the mid-1980s, originally defined for industrial market applications. It uses differential signaling with negative logic, … Read more
When using PLCs, you will encounter many communication protocols and communication interfaces. 01 What Is Serial Communication? A serial port is a very common device communication protocol on computers (do not confuse it with Universal Serial Bus or USB). Most computers have two RS232-based serial ports. The serial port is also a common communication protocol … Read more
Click the above“Mechanical and Electronic Engineering Technology” to follow us 1. Serial Communication Principles Serial communication refers to a method of transmitting data bit by bit between peripherals and computers through data signal lines, ground lines, etc. Serial ports are a type of interface standard that specifies the electrical standards of the interface, but does … Read more
Search on WeChat Technical Training RS-232, RS-422, and RS-485 are all standards for serial data interfaces; Communication issues are similar to traffic issues, with various situations such as high speed, low speed, congestion, and interruptions. If we compare serial communication to traffic, UART is like a station, and a frame of data is like a … Read more