Main functions of data center computer room The Use and Principle of Current Transformer Acrel Support Olympic Winter Games Beijing 2022 Power Supply Solution for Winter Olympics Wireless Temperature Solution at Beijing Daxing International Airport Acrel Releases ADW300 with 333mV Access Energy meters used in urban comprehensive pipe gallery projects Base Station Energy Consumption Monitoring Solution Application of Residual Current Monitor in Street Lighting Discussion on the Combination of MQTT Comprehensive Insights into Temperature Measurement in Industrial Processes DIN Rail Energy Meters: A Comprehensive Guide Operational Principles of Medium Voltage Protection Relays Working Principles and Wiring of Various Types of Electric Meters Digital Electric Energy Meter VS Electronic Electric Energy Meter Problems and Common Fault Analysis of Current Transformers During Operation Detection and Marking of Current Transformers The Functions and Working Principles of Current Transformers Application of DC Current Meters in Substation DC Measurement Operation Methods and Precautions of Current Transformers The Detection and the Open Circuit Fault Inspection of Current Transformers Models, Structures and Installation Methods of Different Hall Current Sensors The Working Principles of the DC Current Shunts How to Set the Temp and Humidity Controller? Precautions of Multifunction Meter Storage Principle and Characteristic Parameters of Hall Current Sensor Multi-function Instrument Definition and Troubleshooting The Use of Prepayment Energy Meter and Its Advantages over Induction Meter Basic Functions of Smart Prepaid Electricity Meter in Student Dormitories How to Use the Multi Function Energy Meter? What Functions Does It Have? Factors That Affect the Performance and Use Value of Prepayment Energy Meter Application of ​IoT Based Electricity Energy Meter Application of Wireless Temperature Sensor in Press What is the Significance of Smart Energy Meter Applications? Smart Energy Meter Application What Are the Common Faults of Current Transformers? Operation Precautions of Current Transformers and the Cause of Burning The Principle and Use of Through-core Current Transformers The Wiring Principle of Current Transformers Design Features of Wireless Temperature Sensors Errors of Daily Current Transformers Common Problems and Solutions of Multifunctional Power Meters A Brief Introduction to the Application and Specifications of DC Shunts What Do You Need to Know to Apply DC Shunts? What Are DC Shunts Made Of? Precision DC Shunts Are High Precision Resistors That Are Critical to Precision Requirements and Accuracy Application Analysis of Current Transformers Fixing Method of Split Current Transformer What is a Smart Gateway? The Difference Between Current Transformer and Zero Sequence Current Transformer Can Ordinary Current Transformers Be Used As Zero-sequence Current Transformers? Structural Difference Between Through-core Current Transformer and Ordinary Current Transformer Wiring Principle of Through-core Current Transformer Introduction to the Principles of Use of Open Current Transformers The application scope of zero sequence current transformer is introduced Standard for operation of three-phase integrated current transformers Installation and use of current transformer How to choose the core type of open current transformer? Working Principle, Structure, and Method for Determining Saturation Point of Current Transformer Confirmation of Current Transformer Saturation Level and Accurate Measurement of Saturation Points Inspection of Connection of Current Transformers Causes and Preventive Measures of Burnout in Current Transformers What Is the Reason for Burnout of Current Transformers During Use? Differentiation of Types of Current Transformers Installation Requirements and Fixing Methods of Split Core Current Transformers Considerations for Operating Current Transformers Issues and Solutions for Installation of Zero-Sequence Current Transformers What Are the Issues to Be Aware of During the Operation of Open-Type Leakage Current Transformers? Application and Requirements of Zero Sequence Current Transformers Principles, Functions, and Classification of Zero-Sequence Current Transformers Main Technical Requirements for Current Transformers Fault Detection and Handling Methods for Open-circuit and Short-circuit on the Secondary Side of Current Transformers Misconceptions in the Use of Current Transformers and Precautions in Work Teaching You the Correct Use of a Through-core CT Current Transformer Operation Considerations and Installation Methods of Split-core Zero-sequence Current Transformers What Do These Parameters Represent in the Din Energy Meter? Main Performance of Open-Type Current Transformers Selection and Calculation of Actual Usage of the Din Energy Meter Things You Don't Know About the Din Energy Meter What Functions Does the Multi-functional Smart Din Rail Electricity Meter Have? Breaking Barriers: How Wireless Technology Transforms Temperature Monitoring in Industry From Factory Floors to Warehouses: Industrial Applications of Wireless Temperature Monitoring Systems Smart Solutions for Energy Monitoring: Harnessing DC Digital Multifunction Meters Smart Energy Monitoring Made Simple: The Magic of Multi-Function Energy Meters Understanding DC Digital Multifunction Meters: Features and Applications Demystifying DIN Rail Meters: A Comprehensive Guide to Their Functionality From Voltage to Current: The Versatility of DC Digital Multifunction Meters Din Rail Meters: Unlocking Precise Energy Measurement in Your Electrical System Choosing the Right Din Rail Meter for Your Specific Energy Monitoring Needs Cutting the Cords: Advantages of Industrial Wireless Temperature Monitoring Systems Saving Energy, Saving Costs: How DIN Rail kWh Meters Make a Difference Streamlining Energy Monitoring: Advantages of DIN Rail Mounted Electricity Meters Efficient Energy Monitoring: Unleashing the Power of DIN Rail kWh Meters Maximizing Space and Functionality: The Benefits of DIN Rail Mounted Meters Unlocking the Potential: Applications of DIN Rail Mounted Electricity Meters A Closer Look at DIN Rail kWh Meters: Features and Applications Efficiency Redefined: How Multi-Function Energy Meters Are Transforming Energy Management Unlocking Energy Insights: The Advantages of Multi-Function Energy Meters From Factory to Field: Industrial Wireless Temperature Monitoring Solutions Precision in Production: The Role of Industrial Wireless Temperature Monitoring Behind the Scenes: How Hospital Isolated Power Systems Keep Healthcare Facilities Running Powering Patient Care: the Importance of Hospital Isolated Power Systems Measuring the Flow: The Science behind DC Current Meter Shunts Powering Your World: How to Select the Ideal Power Meter Supplier Efficiency in a Compact Package: The Benefits of Din Rail Electric Meters Empowering Efficiency: The Role of a Power Monitoring Device Overview of the importance of temperature monitoring in various industries How Does a Multi-Function Energy Meter Compare to Traditional Energy Meters? Do you Know a DC kWh Power Meter? Your Essential Guide on How to Use DC Current Meter Shunts The Role of Isolated Power Panels for Healthcare Facilities Unveiling the Significance of DIN Rail Electricity Meters Unveiling the Soaring Popularity of DIN Rail Electricity Meters How to Choose the Right Multi-function Meter for Your Needs? Din Rail Electricity Meter: Smart Choices for Efficient Energy Management Types of Prepaid Meters: Navigating Efficiency in Commercial Power Management Unveiling the Contrasts between Credit and Prepayment Energy Meters Single Phase vs Three Phase Digital Energy Meters: Powering Industrial Efficiency How Do I Install a DIN Rail Energy Meter? How Can a 3 Phase Digital Energy Meter Help Identify and Detect Power Imbalances? Dc Kwh Meter Provides Kwh-Based Charging for Dc Wallboxes The Future of Isolated Power Panels in Hospitals Electronics Essentials: Understanding DC Power Meter Circuitry Basics Electrifying Vehicles: DC Power Meter Circuits in Electric Cars Industrial Automation: Optimizing Processes with DC Power Meter Circuitry Digital Dynamo: Harnessing the Latest Technologies from Your Power Meter Supplier The Pulse of Efficiency: How to Evaluate an Energy Meter Supplier Wirelessly Wise: Navigating the Benefits of IoT Energy Metering Enhancing Medical Equipment Efficiency: The Role of DC Power Meter Circuits Smart Monitoring, Smarter Savings: The Rise of IoT Energy Meters Data-Driven Decisions: The Role of IoT Energy Meters in Sustainable Practices Innovating Efficiency: How IoT Energy Meters are Revolutionizing Power Management Safe Signals: The Importance of Cell Tower Radiation Meters in Telecom On the Pulse: How Cell Tower Radiation Meters Safeguard Public Health Educational Spaces and Signals: Deploying Cell Tower Radiation Meters in Schools Ensuring Transportation Safety: The Significance of Cell Tower Radiation Meters Along Highways and Railways Enhancing Safety and Wellness in Sports Arenas with Cell Tower Radiation Meters Optimizing Healthcare Facilities: 3 Phase Digital Energy Meters in Hospitals Empowering Industries: 3 Phase Digital Energy Meters in Manufacturing Plants Sustainable Farming: The Role of 3 Phase Digital Energy Meters in Agriculture Powering Smart Cities: 3 Phase Digital Energy Meters in Urban Infrastructure Navigating Maritime: 3 Phase Digital Energy Meters on Seafaring Vessels Navigating Complexity: How Digital Multifunction Meters Simplify Measurement Beyond the Basics: Exploring the Capabilities of Digital Multifunction Meters Smart Solutions for Smart Buildings: Digital Multifunction Meters in Commercial Spaces On the Road to Efficiency: Digital Multifunction Meters in Automotive Manufacturing Connected Campuses: Digital Multifunction Meters in Educational Institutions How DC Energy Meters Enhance Solar Panel Efficiency in Any Climate Mastering The Installation And Set-Up Of Digital Multi-Function Meters The Role of DC Energy Meters in Monitoring Solar Panel Performance Exploring the Versatility of Digital Multi-Function Meters in Industrial Settings Unleashing the Power of Digital Multi-Function Meters How DC Energy Meter for Solar Panels Contributes to Green Energy Practices. The Role of Cell Tower Radiation Meters in Telecommunications Exploring the Technology inside Cell Tower Radiation Meters How Cell Tower Radiation Meters Ensure Public Safety Integration of Renewable Energy Sources and IoT-Based Energy Metering The Vital Role of Medical Isolated Power Panels in Infection Control Measures Safety Features and Regulations for Medical Isolated Power Panels Future Trends and Evolution of IoT-Based Energy Metering Technology Din Rail kWh Meters in Industrial Power Management Enhancing Patient Safety With Medical Isolated Power Panels in Healthcare Settings The Role of DIN Rail kWh Meters in Business Energy Optimization Din Rail kWh Meters for Accurate Data in Manufacturing Plants Testing and Commissioning Procedures for Medium Voltage Motor Protection Relays Key Features of Modern Medium Voltage Motor Protection Relays Din Rail kWh Meters in Monitoring Power Usage in Schools Enhancing Manufacturing Efficiency With DC Power Consumption Meters Navigating Energy Efficiency With DC Power Consumption Meters DC Power Consumption Meters in Optimizing Portable Device Usage Advancements in Medium Voltage Motor Protection Relay Technology Factors Influencing the Accuracy and Performance of Multi-Core Current Transformers Dc Current Shunts and Their Crucial Role in Overcurrent Protection Systems The Principles and Working of DC Current Shunts Unveiling the Latest Breakthroughs in Multi-Core Current Transformer Technology Factors Affecting the Accuracy of DC Current Shunts Unveiling the Power of Multi-Core Current Transformers in Industrial Applications Troubleshooting and Maintenance Tips for Multi-Circuit Power Meters Installation and Wiring Considerations for Multi-Circuit Power Meters Exploring Remote Temperature Measuring Devices in Healthcare Multi-circuit Power Meters and Their Role in Utility Substations How to Accurately Read and Interpret Data from a Single Phase DIN Rail Energy Meter The Future of Single Phase DIN Rail Energy Meters Exploring the Versatility of Single-Phase DIN Rail Meters in Commercial Spaces The Importance of PV Meters in Optimizing Solar Energy Production Remote Temperature Measuring Devices in Industrial Electrical Equipment Revolutionizing Renewable Energy Usage with PV Meters Advantages of Net Metering Using a PV Meter The Role of Split-Type CTs in Advanced Metering Infrastructure The Advantages of Split-type CTs in Space-constrained Environments Application of Remote Temperature Measuring Device in Commercial Buildings Installation and Setup of DC Power Monitoring Systems Importance of DC Power Monitoring in Industrial Applications Unveiling the Working Principle of Split-type CT Unveiling the Hidden Potential Within Modern Power Systems Latest Advancements and Trends in Split-Type CT Technology Navigating DC Power Monitors for Commercial Buildings Accuracy and Reliability of Open Current Transformers in Measurements Multi-Data Meters in Industrial Process Monitoring Multi-Data Meters in IoT and Connectivity Solutions How Multi-Data Meters Transform Energy Management Role of Open Current Transformers in Industrial Automation and Monitoring Advantages of Using Open Current Transformers in Power Systems The Function of Induction Meter in Campus Revolutionizing Commercial Energy Management with IoT-Based Energy Meters Real-time Energy Usage Tracking and Analysis with IoT Based Energy Meter IoT-Based Energy Meters in Industrial Applications How Smart Prepaid Electricity Meters Work Benefits of Using Smart Motor Protection Relays in Industrial Applications The Function of Smart Motor Protection Relay in Campus Hospital Isolated Power: Ensuring Safety and Reliability in Healthcare Settings How Smart Motor Protection Relays Help Prevent Motor Failures and Downtime The Vital Role of Hospital Isolated Power in Medical Facilities Benefits of Installing Smart Prepaid Electricity Meters Role of Hospital Isolated Power Systems in Reducing Electrical Hazards in Healthcare Settings The Role of Smart Prepaid Electricity Meters in Commercial Spaces The Application of Smart Prepaid Electricity Meter in Campus HANNOVER MESSE

Discussion on the Combination of MQTT

MQTT (Message Queuing Telemetry Transport), also known as Message Queuing Telemetry Transport protocol, is a "lightweight" communication protocol based on publish/subscribe mode. It is a communication protocol built on TCP/IP and released in 1999. The advantage of MQTT is that it can provide real-time, reliable messaging services for connecting remote devices with little code and limited bandwidth. As a real-time communication protocol with low energy consumption and low bandwidth occupation, it has been widely used in the Internet of Things, small devices, mobile applications and so on.

MQTT server (message agent), the common MQTT server is not a bunch of cabinets in the macro computer room, but based on the Erlang/OTP platform development of a software, and then there are computers and other devices to run this software. Intuitively understood as a server or a cluster of servers running MQTT message server software.

Figure 1-1 shows the functions:

(1) Accept network connections from clients

(2) Accept the information released by the client

(3) Handle subscription and unsubscription requests from clients

(4) Forward application messages to subscribed customers.

MQTT Protocol Network Transmission

MQTT will build the underlying network transport, it will establish the client and server connections, and Provides ordered, lossless, bidirectional transmission based on byte stream. When sending data, MQTT will associate the associated quality of service (Qos) with the Topic.

(1) Protocol principle

The communication process of MQTT protocol needs to be completed by both client and server. There are three identities: Publish, Broker and Subscribe. The message publisher and subscriber can both be clients, and the message broker is the MQTT server.

① The implementation of MQTT

Topic: Which can be understood as the type of message;

Payload: Indicates the message content, which is the data content to be used

②MQTT client

An application or device using the MQTT protocol, which is a network connection based on the MQTT server, is used to publish information, subscribe to publish information, unsubscribe or delete application messages, and disconnect from the server.

(2) MQTT protocol characteristics

The protocol is designed to communicate with remote sensors and control devices in low-bandwidth, unreliable networks. It has the following main features:

① Use the publish/subscribe message mode to provide one-to-many message publishing and decoupling application programs.

② The message transmission of the load content mask.

③ Use TCP/IP to provide network connections.

④ There are three kinds of message publishing quality of service, message publishing (Qos: 0 at most once, 1 at least once, 2 only once)

⑤ Small transmission, small traffic demand.


The Communication between MQTT Server and Terminal Monitoring Device

Many meters connect to gateways to enable devices to interact with MQTT servers. However, the ADW300 meter, one of our ADW series meters, has the Internet function itself, including 4G and WIFI, which enable the device to have the Internet function through the IoT card or LAN. Reduce the trivial process of connecting the device to the gateway and then the server, and realize the industrial Internet of Things.

1. ADW300 Three Phase Wireless Energy Meter Main Functions:

Small Size

High Precision: Class 0.5S

Rich functions: Voltage , Current, Power factor, Frequency, Active power, Reactive power, Apparent power, Harmonic, Temperature Measurement, DI/DO, Alarm, etc.

Many Options for Communication: RS485, LoRa, NB, 4G, WiFi

External CT


ADW310 Single Phase Wireless Energy Meter Main Functions:

Input current AC 20(100)A

Active energy accuracy: Class 1

Rich functions: Voltage , Current, Power factor, Frequency, Active power, Reactive power, Apparent power, Temperature Measurement, Digital input/Digital output, Leakage of current alarm, etc.

Many Options for Communication: RS485, 4G, WiFi, LoRa

Including CT


2. Standardized MQTT protocol

① Subscription

Subscriptions include Topic filters and Quality of Service (QoS). A subscription is associated with a Session. A session can contain multiple subscriptions. Each subscription in each session has a different topic filter.

② Session

After each client establishes a connection with the server, there should be a stateful interaction between the session client and the server. The session exists between a network or may span multiple continuous network connections between the client and the server.

③ Topic Name

A tag connected to an application message that matches the server's subscription and the server sends the message to each client whose subscription matches the tag

④ Data Upload

The wireless transmission of the electricity meter achieves small transmission and small traffic demand. The data uploading process of this electricity meter is simple. (See appendix for details) the redundant data uploading steps are optimized to promote customized data uploading. It includes commonly used electrical parameter data, signal strength, active power demand, voltage-current ratio, temperature, DI state, voltage-current harmonic distortion rate, peak and valley electric energy and so on.


To sum up, in the current environment of Internet of Things technology, MQTT server has been adopted by various businesses, because MQTT server and MQTT protocol can meet their intelligent management needs. Some production workshops of many enterprises need to use wireless equipment to monitor the working state of electrical equipment, and the production workshops of enterprises are mostly scattered independent electrical equipment, if each equipment is installed gateway, the cost of transformation is a great amount of capital. Therefore, in order to save costs, most enterprises often install a batch of electricity meters for wireless monitoring equipment -- ADW300. Through CT, various equipment parameters of cables and production lines are collected, mainly including electric parameter data such as current and voltage, and the obtained data is uploaded to the MQTT server cloud in real time. Then subscribe to the subject of MQTT server through the Internet of Things platform and database to obtain the data of terminal monitoring equipment, realize the two-way communication between terminal and cloud, and build a powerful data channel. The obtained data is stored in the cloud database of MQTT server, which can ensure the security of the data and build the power management and display system. Through cloud technology, big data and the Internet, the obtained data will be displayed to the foreground, and users can monitor the power data of equipment and cables in real time by logging in the mobile APP and web page.

Related Articles about Acrel



Popular Acrel Energy Meter Products Recommended

We use cookies to offer you a better browsing experience, analyze site traffic and personalize content. By using this site, you agree to our use of cookies. Privacy Policy
Reject Accept