485 Communication

Integrating Wireless Communication Modules: Practical Guide to Connecting Microcontrollers with Bluetooth Modules

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Integrating Wireless Communication Modules: Practical Guide to Connecting Microcontrollers with Bluetooth Modules

Integrating Wireless Communication Modules: Practical Guide to Connecting Microcontrollers with Bluetooth Modules In modern electronic projects, wireless communication has become an indispensable part, and Bluetooth modules are a popular choice for wireless communication due to their low power consumption, low cost, and ease of use. This article will focus on the integration of microcontrollers with … Read more

PLC Ladder Diagram and HMI Interaction Design Methods

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PLC Ladder Diagram and HMI Interaction Design Methods

Click the blue text for more exciting information I have been in the PLC industry for nearly 20 years, working on the front lines. To be honest, seeing those freshly graduated young people programming makes me laugh. They hold onto a pile of theories talking about control algorithms, yet they can’t even understand a simple … Read more

Design Principles and Reusability Strategies for Converters in PLCs

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Design Principles and Reusability Strategies for Converters in PLCs

Click the blue text to follow! PLC Old Li Talks Technology: What’s So Difficult About PLCs? Discussing Those Pitfalls from a Practical Perspective Last week, Xiao Zhang rushed over to me, saying: “Old Li, the production line 3 has stopped again, the system is alarming, and I’ve been looking at it for a long time … Read more

PLC System Configuration Programming: Common Mistakes and Solutions for Beginners

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PLC System Configuration Programming: Common Mistakes and Solutions for Beginners

Recently, a young electrician came to ask about PLC configuration. Looking at his program, I was truly speechless. Today’s young people seem to just throw everything into the code without considering the basic scanning cycle. Back in the day when I started in this field, we didn’t even have decent programming software; we used old-fashioned … Read more

How to Implement PROFIBUS DP Communication Between S7-300 and S7-200

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How to Implement PROFIBUS DP Communication Between S7-300 and S7-200

Supported baud rate range: 9600—-12M Order number: 6ES7-277-0AA22-0XA0 1. First, install the GSD file for EM277 (GSD file download link: http://www.con-star.com/download/download11.html) 2. In the path PROFIBUS DP—Additional Field Devices—PLC—SIMATIC—EM277, drag it into the DP line configuration 3. Click on “EM277 profibus dp” to see various types of communication data classifications, such as “2 BYTE OUT/ … Read more

Practical Sharing: Modbus Communication Programming Examples – An Exciting Series!

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Practical Sharing: Modbus Communication Programming Examples - An Exciting Series!

Modbus Communication Programming Example (1) Recently, I have been writing about Modbus and fieldbus introductions separately, which are more conceptual and do not involve specific examples. Many readers may still find it insufficiently detailed. Since I am no longer engaged in specific programming debugging, providing direct examples is quite challenging. I referenced some materials from … Read more

PLC Scan Cycle Programming: Common Mistakes and Solutions for Beginners

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PLC Scan Cycle Programming: Common Mistakes and Solutions for Beginners

Recently, I’ve encountered several newcomers asking about the PLC scan cycle issues, it’s really frustrating! They keep making the same mistakes over and over again. After working in this field for over ten years, I’ve seen too many program crashes caused by a lack of understanding of the scan cycle principles. To put it bluntly, … Read more

HTTP vs RPC: The ‘Letter’ and ‘Phone Call’ of Communication – Which is the True Love for Efficient Collaboration?

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HTTP vs RPC: The 'Letter' and 'Phone Call' of Communication - Which is the True Love for Efficient Collaboration?

Introduction: The “Dimensionality Reduction” of Communication Methods Suppose you want to convey a message to a friend: Writing a Letter (HTTP) Clearly write the address, affix a stamp, and wait for the mailman to deliver it. The recipient opens the letter to read it. Making a Phone Call (RPC) Dial directly, and once connected, have … Read more

Modbus-RTU Protocol Response Example

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Modbus-RTU Protocol Response Example

Click 👆 aboveFollowEngineer Yan Ji and ★ Star Mark ★. Modbus-RTU Protocol The RTU ADU is shown in the figure below. In addition to the core PDU, this ADU contains only two pieces of information. First, the address is used to define the slave device corresponding to the PDU. In most networks, address 0 is … Read more

Learning BLE from Scratch: Discovering Services and Characteristics

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Learning BLE from Scratch: Discovering Services and Characteristics

Through previous studies, we learned that BLE devices act as servers, storing some data, while clients achieve corresponding functions by reading, writing, and configuring this data. Previously, we learned about broadcasting and connections; today, let’s take a look at what happens after a connection is established.Discovery of Services and CharacteristicsAfter a device establishes a connection, … Read more