RS 485

Programming Case: Communication Between Weintek Touch Screen and Mitsubishi FX3U BD Board

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Programming Case: Communication Between Weintek Touch Screen and Mitsubishi FX3U BD Board

In industrial automation systems, stable communication between the touch screen and PLC is crucial for the normal operation of equipment. The Weintek touch screen, known for its cost-effectiveness, and the Mitsubishi FX3U PLC, recognized for its stability, have become the preferred combination for many automation projects. However, in actual wiring and parameter configuration, even a … Read more

Understanding MODBUS-RTU Protocol: Mastering Industrial Communication with Four Core Function Codes (01/03/05/06)

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Understanding MODBUS-RTU Protocol: Mastering Industrial Communication with Four Core Function Codes (01/03/05/06)

In the field of industrial control, MODBUS-RTU is one of the most universal and time-tested communication protocols. It acts like the “Mandarin” among devices, allowing instruments, PLCs, and controllers from different manufacturers to communicate smoothly. Today, I will set aside complex theories and directly guide you through the four most commonly used function codes:01, 03, … Read more

Understanding the Basic Connection Methods and Communication Principles of PLC and Inverters

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To quickly learn how to control inverters using PLCs, it is essential to master the basic connection methods and communication principles between PLCs and inverters. Below are some common control methods and technical points to help you get started: 1. Connection Methods between PLC and Inverter 1. Analog Output Control of Inverter This method controls … Read more

In-Depth Understanding: Modbus-RTU Protocol Based on RS-485 Communication

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Whether it is RS-485 or MODBUS, their applications are very extensive in the fields of industrial automation, the Internet of Things, and embedded systems. Today, we will introduce the Modbus-RTU protocol based on RS-485 communication. We will gradually explain what Modbus is, from the 485 protocol to the Modbus protocol and then to the porting … Read more

Simple and Easy-to-Use RS-232, RS-485, and RS-422 Conversion Solutions

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[Image] In industrial field applications, there are many bus application scenarios, such as RS-232 and RS-485 conversion with bidirectional isolation, and shared interfaces between RS-485 and RS-422. This article will introduce solutions for these types of applications, which are not only simple and convenient but also enhance communication reliability. The high-performance RS-232 to RS-485 bidirectional … Read more

What Types of Bus Communication Protocols Are There? How to Choose?

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What Types of Bus Communication Protocols Are There? How to Choose?

Title: What Types of Bus Communication Protocols Are There? How to Choose? First Paragraph: In the field of embedded systems, encountering various types of buses, scattered standards, and high on-site wiring costs is common. RS-485, CAN, and Ethernet each have their advantages and disadvantages, but when deploying quickly in a complex environment, factors such as … Read more

New Choices for Domestic RS-485/RS-422 Transceivers: CYI3488/3490/3491

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New Choices for Domestic RS-485/RS-422 Transceivers: CYI3488/3490/3491

In high-demand application scenarios such as industrial communication, automation control, and telecommunications infrastructure, stable, high-speed, and interference-resistant data transmission is a key issue. For a long time, the MAX series of RS-485/RS-422 transceivers have been widely adopted due to their reliability. Now, Shanghai Chenyu Electronics has launched a new series of CYI3488, CYI3490, and CYI3491 … Read more

What is Modbus? Understanding It Clearly to Avoid Pitfalls Next Time

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What is Modbus? Understanding It Clearly to Avoid Pitfalls Next Time

What is Modbus? Understanding It Clearly to Avoid Pitfalls Next Time Last night, a junior was debugging the RS-485 bus, and the slave device just wouldn’t respond. After capturing the data, I found: the CRC low byte was reversed! Not fully grasping the Modbus frame format meant that 1 byte error = total failure. Today, … Read more

Understanding Industrial Communication Protocols: MQTT, Modbus, PLC, TCP, RS-485, and More

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Understanding Industrial Communication Protocols: MQTT, Modbus, PLC, TCP, RS-485, and More

In modern industrial automation systems, interconnectivity between devices is core. Whether for data acquisition, remote control, or production management, an efficient and stable communication system is essential. From the underlying physical interfaces to protocol standards, and up to the upper-level HMI and SCADA application software, industrial communication has gradually developed a complete architecture. Today, we … Read more

Complete Guide to RS-485 Interface Circuit Design

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Complete Guide to RS-485 Interface Circuit Design

Click on the arrow “blue text” , follow us! Q: How can I see such articles every day? A: Just search for the public account “51 Microcontroller Learning Network” and follow for free. This design guide discusses how to design RS-485 interface circuits. It covers the necessity of balanced transmission line standards and provides an … Read more