485 Communication

SPI Communication Technology: Practical Applications of MCU and FLASH

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SPI Communication Technology: Practical Applications of MCU and FLASH

1. Introduction 1.1 Document Background The Serial Peripheral Interface (SPI) is a full-duplex synchronous serial communication interface developed by Motorola, widely used for data transmission between microcontrollers and peripheral devices. This document takes the communication between MCU and FLASH memory as an example, elaborating on the hardware design, software implementation, and practical applications of SPI … Read more

Siemens S7-200smart PLC MODBUS RTU Communication Case Study

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Siemens S7-200smart PLC MODBUS RTU Communication Case Study

1. TaskThe S7-200smart PLC reads the weight data from the weighing sensor via MODBUS-RTU communication.2. Device Model DataS7-200smart PLC:SR60 3. Introduction to MODBUS Master Station Commands4. Commands1. MODBUS Master Station Initialization Command2. Polling Method to Read Weight Value and Decimal PlacesUse the completion flag M10.0 of the initialization program and the completion flag M10.2 of … Read more

Linux | 23. File Viewing with wc, cat, head, tail

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Linux | 23. File Viewing with wc, cat, head, tail

Introduction In this section, we will learn how to view files. In fact, we have used these commands multiple times in previous tutorials, so many of you may already be very familiar with them. In Windows, we know that both txt text files and word docx files have corresponding software to open and view them. … Read more

SPI Communication Technology: Practical Applications of MCU and FLASH

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SPI Communication Technology: Practical Applications of MCU and FLASH

This article is approximately 4,500 words long, recommended for saving and reading. Author | Engineer Xiao Mo Produced by | Automotive Electronics and Software Table of Contents 1. Introduction 2. Basic Theory of SPI Protocol 3. Hardware Design Solutions 4. Software Architecture Design 5. Driver Implementation 6. Summary 1. Introduction 1.1 Document Background The Serial … Read more

Can’t Connect PLC to Computer? Follow These 5-Minute Steps for Success!

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Can't Connect PLC to Computer? Follow These 5-Minute Steps for Success!

In the workshop, you’re in a hurry to debug the program, but the PLC and computer just won’t connect; despite following the wiring tutorial, the software keeps reporting “communication failure”; as a beginner, you’re at a loss with a bunch of wires, just waiting for a technician — does this sound like your experience when … Read more

Modbus Communication Dropping Frequently? This Troubleshooting Checklist Helps You Locate the Problem in 5 Minutes

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Modbus Communication Dropping Frequently? This Troubleshooting Checklist Helps You Locate the Problem in 5 Minutes

In non-standard automation projects, Modbus communication failures are one of the most troublesome issues for engineers. Sudden device disconnections, abnormal data transmission, communication timeouts… These problems not only affect production efficiency but can also lead to the shutdown of the entire production line. After years of practical experience, we have summarized this 5-minute quick troubleshooting … Read more

What to Consider When Using RTOS?

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What to Consider When Using RTOS?

Follow “Embedded Miscellany” and select “Star the Official Account” to progress together! Source | CSDN For many embedded projects, system designers tend to choose a Real-Time Operating System (RTOS). But is an RTOS always necessary? The answer depends on the specific application, so understanding what goals we aim to achieve is key to determining whether … Read more

How Dalian Automation’s Profibus to Fiber Optic Technology Reshapes HMI Communication Standards in the Era of Industry 4.0

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How Dalian Automation's Profibus to Fiber Optic Technology Reshapes HMI Communication Standards in the Era of Industry 4.0

In the wave of smart manufacturing and Industry 4.0, the HMI (Human-Machine Interface) serves as the “bridge” between equipment and operators, undertaking core functions such as real-time data display, equipment monitoring, and interactive control. However, traditional Profibus bus connections often suffer from issues such as electromagnetic interference and transmission distance limitations, leading to screen freezes, … Read more

Basics of Peripheral Control with ESP32: UART Communication

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Basics of Peripheral Control with ESP32: UART Communication

1. Basic Concepts of UART UART (Universal Asynchronous Receiver/Transmitter) is a universal asynchronous transceiver with the following characteristics: Asynchronous Communication: No clock line is required, only TX (transmit) and RX (receive) data lines are needed. Full-Duplex Transmission: Supports simultaneous data transmission and reception. Flexible Configuration: Baud rate, data bits, parity bits, and stop bits can … Read more

Open Source Project Based on Qt: MQTT Communication Debugging Assistant

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Open Source Project Based on Qt: MQTT Communication Debugging Assistant

Project Overview This project implements a desktop client application based on the Qt framework for communication with an MQTT server. Through this application, users can connect to the MQTT server, subscribe to and publish topic messages, and receive and process messages from the server. The project utilizes the <span>QMqttClient</span> class to implement MQTT protocol functionality, … Read more