RS232 and RS485 are common interfaces in low-voltage applications, but some people always struggle to distinguish their differences. Below is an analysis of the RS232 and RS485 interfaces.Due to the early emergence of the RS232 interface standard, it inevitably has some shortcomings, mainly including the following four points:(1) The signal voltage levels of the interface … Read more
Consider a DC power supply with an output socket interface that has three pins: positive, negative, and ground. Accordingly, the load’s plug should also have three pins corresponding to the power supply side to correctly obtain power supply. Note that there are three essential conditions that must be met: The first is that the shape, … Read more
– RS485: It is a physical layer electrical standard that specifies the electrical characteristics of data transmission, signal levels, transmission distances, and connection methods. It uses differential signaling for transmission, has strong anti-interference capabilities, and can achieve half-duplex communication between multiple devices. It is commonly used for long-distance data transmission in industrial environments. – Modbus: … Read more
Hello everyone, today I will guide you through a real project—creating a smart home control system using PLC and Arduino. Why combine these two devices? The PLC is like an experienced factory master, stable and reliable but not very flexible; the Arduino is like a creative geek, rich in functionality but needs protection. By teaming … Read more
In fields such as industrial automation and remote monitoring, many are familiar with RS485 hubs. However, RS485 has several issues, such as data return delays and insufficient security. How can engineers leverage strengths and mitigate weaknesses to minimize these impacts?! 1. What Issues Exist with RS485 Hubs? Data return delay: The host can send data … Read more
RS485 hubs play a crucial role in industrial automation, remote monitoring, and other fields, but various issues often arise during their application. How can we address these problems promptly? The following discusses these issues. 1. Common Mode Interference and Signal Ground Handling Issue: Common mode voltage exceeding the RS485 transceiver range can lead to unstable … Read more
Click the blue text / to follow us Serial Communication and Parallel Communication In communication and computer science, serial communication is a general concept that refers to all serial communication protocols, such as RS232, RS422, RS485, USB, I2C, SPI, etc. Serial communication refers to a communication method that transmits data bit by bit using only … Read more
Overview of RS232 The RS-232 interface complies with the serial data communication interface standard established by the Electronic Industries Alliance (EIA). The original designation is EIA-RS-232 (abbreviated as 232, RS232). It is widely used for external connections of computer serial interfaces, including connection cables, as well as mechanical, electrical, signal, and transmission processes. The RS-232-C … Read more
PROFIBUS DP Basic Introduction PROFIBUS DP is a classic fieldbus protocol introduced by Siemens many years ago, widely used in various industrial applications. With more domestic manufacturers participating in the production and manufacturing of PROFIBUS DP related devices, various designs for the physical connection of PROFIBUS DP have emerged. To facilitate everyone in designing the … Read more
unsetunsetIntroductionunsetunset Last week, I encountered a real project failure where Old Zhang’s robotic arm suddenly started dancing, and the PLC data could not be transmitted to the cloud. Today, let’s discuss how to use a $20 ESP32 module to handle both PLC’s RS485 communication and cloud data integration. No need for high-end gateways; follow me … Read more