Year: 2025

RS-485 Multi-Slave Communication: How to Effectively Avoid Interference Between Devices?

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RS-485 Multi-Slave Communication: How to Effectively Avoid Interference Between Devices?

In scenarios such as industrial automation, building control, and energy monitoring, RS-485 serial communication is widely used for data transmission between devices due to itslong-distance transmission capability, strong anti-interference ability, and support for multi-node communication. Especially in a master-slave structure, RS-485 is an ideal choice for achieving centralized control and distributed sensing. However, during actual … Read more

EOS-8: IO/SPI/I2C/RS232-485

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EOS-8: IO/SPI/I2C/RS232-485

★★★EOS-8—IO★★★ Author: Timothy Proofreader: Timothy Introduction: For various conventional interfaces, we have a good awareness of ESD protection. However, for some discrete or DIY circuits, cross-board usage often also requires ESD protection, such as GOIO, acquisition ports, or cross-board SPI, I2C, etc. This section introduces ESD protection for some IO and cross-board communication interfaces. €1.Digital … Read more

A Detailed Discussion on the Differences Between RS232 and RS485 Interfaces

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A Detailed Discussion on the Differences Between RS232 and RS485 Interfaces

RS232 and RS485 have always been common interfaces in low-voltage applications. Many people mention the differences between them, so today let’s explore them together. 1. Physical Structure of the Interfaces 1. RS232 Interface: One of the computer communication interfaces, the RS-232 interface typically appears in the form of 9 pins (DB-9) or 25 pins (DB-25). … Read more

Keyence SR-X Series Barcode Scanner RS232C Communication with PLC Without Protocol

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Keyence SR-X Series Barcode Scanner RS232C Communication with PLC Without Protocol

The connection method for the barcode scanner and Mitsubishi Q series PLC using RS-232C communication (without protocol) will be illustrated as an example. 1　Devices Used 2 Connection Method 3 Configuration of Keyence Barcode Reader 4　Configuration of Mitsubishi Electric PLC Q Series 5　Creating and Transmitting Ladder Diagram Program 6　Execution of Ladder Diagram Program and Monitoring of … Read more

Practical Automation in Operations: Managing Thousands of Servers with Ansible and Python

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Practical Automation in Operations: Managing Thousands of Servers with Ansible and Python

At three o’clock that morning, I was dealing with an unexpected online failure with my colleagues, where dozens of service nodes needed urgent configuration updates. Manual operation? Not realistic. Writing a temporary script? Too slow. At that moment, I remembered the Ansible + Python automation framework I had configured earlier. Within three minutes, all node … Read more

Basic Usage of Ansible Playbook

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Basic Usage of Ansible Playbook

Introduction to Ansible Playbook A Playbook is a component of Ansible used for configuration management. While Ansible’s AD-Hoc command functionality is powerful and can accomplish some basic configuration management tasks, AD-Hoc commands cannot support the configuration management of complex environments. In our practical use of Ansible, most of the time is spent writing Playbooks. In … Read more

Using Ansible Playbook to Copy Files from Remote Server

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Using Ansible Playbook to Copy Files from Remote Server

Copy files from a remote server to a local computer. This can be accomplished using the Ansible fetch module. This is useful when you want to copy certain log files from a remote server to your local machine. By default, a directory named after each host you are connecting to will be created in the … Read more

Ansible Inventory Management: From Basics to Advanced Usage (Part 4)

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Ansible Inventory Management: From Basics to Advanced Usage (Part 4)

Ansible Inventory The inventory is used to define which hosts are managed by Ansible. The inventory supports the following formats: • IP addresses • Hostnames • Ranges (<span>server[b:c]</span>) • Host groups (<span>webserver</span>) • Subgroups (<span>lnmp:children</span>) Inventory 172.25.250.10 [webserver] server[b:c] [mysql] 172.25.250.1[3:4] [lnmp:children] webserver mysql • Directly defining a hostname or address, currently <span>172.25.250.10</span> does not … Read more

In-Depth Analysis of Typical BLE Application Scenarios: Full Process Design and Code Examples for Smart Home, Health Monitoring, Asset Tracking, and IoT Data Collection

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In-Depth Analysis of Typical BLE Application Scenarios: Full Process Design and Code Examples for Smart Home, Health Monitoring, Asset Tracking, and IoT Data Collection

The following is a complete process example of BLE technology in typical application scenarios, covering smart home control, health monitoring, asset tracking and IoT data collection. It combines hardware configuration, software processes, communication interactions and code examples to help developers quickly understand the actual application logic: 1. Smart Home Control (e.g., light switch) Scenario Description … Read more

Understanding Mi Home BLE Mesh: Unlocking New Approaches to Smart Home Development

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Understanding Mi Home BLE Mesh: Unlocking New Approaches to Smart Home Development

Friends engaged in IoT development are certainly familiar with BLE Mesh technology, especially in the smart home field, where it plays a crucial role. Today, we will specifically discuss Mi Home BLE Mesh, packed with valuable information, so get your notebooks ready and take note of the key points!1. Basic Concepts of SIG BLE MeshBLE … Read more