Search on WeChat Technical Training In 1979, Schneider Electric established a bus protocol for industrial sites called the Modbus protocol. Nowadays, many industrial applications using RS485 communication adopt the Modbus protocol. Today, we will explore RS485 communication and the Modbus communication protocol. 1. Introduction In fields such as industrial control, power communication, and smart instruments, … Read more
In industrial control, power communication, and smart instrumentation, data exchange often relies on serial communication. Initially, the RS232 interface was the mainstream choice; however, due to the complexity of industrial sites, various electrical devices generate electromagnetic interference that can lead to signal transmission errors. In 1979, Schneider Electric designed and launched a bus protocol specifically … Read more
Recently, I used the Modbus protocol for communication with third-party devices. Here are some points to summarize and share, to help everyone avoid pitfalls in the future. This article does not provide a systematic explanation of the Modbus protocol but describes the issues and precautions encountered during usage, taking RS485-based Modbus-RTU as an example: 1. … Read more
1. Why Is Serial Communication So Popular? When working on microcontroller products, the most commonly used method is serial communication. For any microcontroller peripherals, the priority is to choose those with serial port functionality, such as Bluetooth modules, WIFI modules, 4G modules, electric meters, and displays. Why Is Serial Communication So Popular? Because it’s simple! … Read more
PROFINET and PROFIBUS are two fieldbus systems introduced by the PNO organization. There is no comparability between the two; PROFINET is based on industrial Ethernet, while PROFIBUS is based on RS485 serial bus. The protocols of the two are completely different due to the differing media, with no connection between them. However, both have excellent … Read more
Search on WeChat Electrical Engineering Learning In most cases, the touch screen is connected to the PLC, which then connects to the inverter. However,the touch screen can also connect directly to the inverter without going through the PLC, allowing control over the inverter’s start, stop, and frequency changes. Today, we will use the Weintek touch … Read more
Search on WeChat Technical Training In most cases, the touch screen is connected to the PLC, which then connects to the inverter. However, the touch screen can also connect directly to the inverter without going through the PLC. It can control the inverter’s start, stop, frequency change, etc. Today, we will take the Weicon touch … Read more
The following example connects the MT6103IP touch screen to a Panasonic PLC; other brands of PLCs can be referenced. 1. Determine the connection scheme as follows: 2. Hardware wiring Below are the wiring terminals of the touch screen, which has 9 pins, allowing for one group of RS232 and another group of RS485. 1) RS232 … Read more
In microcontroller development, protocols such as UART, I2C, and RS485 are commonly used, and understanding them can be somewhat ambiguous. This article organizes these concepts. The reading time is approximately 10 minutes. UART Universal Asynchronous Receiver-Transmitter The UART port refers to a type of physical interface (hardware). UART is an asynchronous, full-duplex serial bus. It … Read more
In the previous article “UART Communication Interface Protocol – UART (I) Protocol Basics”, we briefly and meticulously describedUART configuration items and the signal timing of the communication process. This article will continue to introduce some interface specifications used by theUART interface under different electrical characteristics. 1. Introduction In fact,UART only defines the signal timing without … Read more