-Begin- Basic Knowledge of Modbus The Modbus communication protocol was published by Modicon (now Schneider Electric) in 1979 for communication with programmable logic controllers (PLCs). Today, Modbus has become the industry standard for communication protocols in the industrial field and is commonly used for connecting industrial electronic devices. Modbus, being the most widely used protocol … Read more
-Begin- ModbusTCP Protocol Analysis ModbusTCP has the same message format as ModbusUDP; the difference between them is essentially the difference between TCP and UDP. Therefore, we will analyze the ModbusTCP protocol below. The differences between ModbusTCP and ModbusRtu (ModbusASCII) are shown in the figure below: As can be seen from the figure above, ModbusTCP, based … Read more
Modbus is widely used due to its advantages The Modbus protocol is standard, open, publicly available, and has no copyright requirements The Modbus protocol supports various electrical interfaces, including RS232, RS485, TCP/IP, and can transmit over various media such as twisted pair, fiber optics, infrared, and wireless The Modbus protocol message frame format is simple, … 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. Completed IIC and SPI communication using software simulation; 2. Next, prepare to use DMA to transfer SPI data and calculate the angle time for reading once.
Click here to download the materials (3rd update) Here are some resources for everyone, copy and reply with the following keyword to receive Practical Power Supply Circuit About Today’s Post SPI is a high-speed, full-duplex communication bus. SPI communication uses 3 buses and a chip select line: SCK, MOSI, MISO, and the chip select line … Read more
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Introduction To save MCU I/O resources, RS-485 automatic transceivers are often used, but these types of transceivers encounter some application problems to varying degrees. How can these issues be resolved? This article will reveal the answers from the working principle. Introduction to Automatic Transceiver Circuits and Application Analysis Principle of Automatic Transceiver Circuits The common … Read more
This article guide The RS-485 bus is a half-duplex communication bus, so it usually requires an MCU to control the transmit/receive state of the RS-485 transceiver. To save MCU I/O resources, RS-485 automatic transceivers have emerged, but these types of transceivers encounter some application issues to varying degrees. How can these issues be resolved? This … Read more
