485 Communication

PCBA for Agricultural Drones: Flight Control, Power Control, and Communication Transmission

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PCBA for Agricultural Drones: Flight Control, Power Control, and Communication Transmission

Case IntroductionPCBA for Agricultural DronesFunction Overview1. Flight Control and Navigation Flight Controller: As the “brain” of the drone, the flight controller integrates a microcontroller unit (MCU) that processes signals from sensors and executes flight tasks such as takeoff, hovering, route planning, and landing. Inertial Measurement Unit (IMU): Includes accelerometers, gyroscopes, and magnetometers to monitor the … Read more

What is the Purpose of MQTT?

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What is the Purpose of MQTT?

Author: Free and Open Lake AI What is MQTT Used For? MQTT is a lightweight messaging protocol commonly used for Internet of Things (IoT) devices, designed to be energy-efficient and consume minimal bandwidth. The MQTT protocol operates over TCP/IP and is based on a lossless communication bi-directional publish-subscribe model, ensuring that MQTT messages are delivered … Read more

Understanding Buses in Communication Systems

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Understanding Buses in Communication Systems

In previous articles, we have completed discussions related to module testing. Starting from this section, we will introduce tests related to PACK, beginning with some knowledge about communication to lay the groundwork for subsequent chapters. In communication, we often encounter the term bus, such as address bus, data bus, control bus, etc. The English term … Read more

FX5U: Beginner’s Guide to Mitsubishi PLC and Practical Modbus Communication

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FX5U: Beginner's Guide to Mitsubishi PLC and Practical Modbus Communication

FX5U: Beginner’s Guide to Mitsubishi PLC and Practical Modbus Communication Imagine you have just taken over an automation renovation project, with five frequency converters standing like silent soldiers waiting for orders. An operator points to the flashing screen in the control room and asks, “Can the data from these devices be displayed in real-time?” Don’t … Read more

Mastering SPI Communication: Comprehensive Guide to Four-Wire and Seven-Wire Applications

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Mastering SPI Communication: Comprehensive Guide to Four-Wire and Seven-Wire Applications

1. Overview of SPI Communication SPI (Serial Peripheral Interface) is a synchronous serial communication protocol developed by Motorola (now NXP), primarily used for short-distance, high-speed communication between master and slave devices. Its features include full-duplex transmission, master-slave architecture, and no complex protocol layers, making it widely used in embedded devices such as memory (e.g., Flash), … Read more

How to Detect and Resolve I2C Communication Deadlocks

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How to Detect and Resolve I2C Communication Deadlocks

Click the aboveblue text to follow us The I2C bus, as a widely used communication protocol in embedded systems, has its stability and reliability directly affecting the overall performance of the system. An I2C deadlock refers to a situation where the bus is stuck and unable to continue communication, usually caused by a slave device … Read more

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

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

Connecting PLC Input/Output Devices and Variable Definitions

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Connecting PLC Input/Output Devices and Variable Definitions

In the years of factory automation, I have seen too many beginners complicate simple issues. Today, let’s talk about PLC input and output. Many people think it’s simple at first glance, but there are numerous cases of failure when actually implementing it. Just the other day, I visited a paper factory where the so-called engineer … Read more

Exploring the MQTT Protocol | From Basics to Applications

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Exploring the MQTT Protocol | From Basics to Applications

MESSAGE QUEUING TELEMETRY TRANSPORTWhat is the “MQTT” Protocol? MQTT (Message Queuing Telemetry Transport) is a standard (ISO/IEC PRF 20922) based on the publish-subscribe paradigm. It operates on top of the TCP/IP protocol and is designed for remote devices with limited hardware capabilities and poor network conditions, making it a publish/subscribe messaging protocol that is lightweight, … Read more