Imagine a DC power supply with an output socket that has three pins: positive, negative, and ground. Correspondingly, the load’s plug should also have three pins that match the power supply side, allowing for correct energy supply. Note that there are three essential conditions to meet: The first is that the shape, size, and pin … Read more
Search on WeChat Technical Training 1. What is MODBUS? 1. Basic Concepts MODBUS is a communication protocol initially advocated by MODICON (now a brand of Schneider Electric). It has gradually been recognized as a standard communication protocol through practical applications by most companies. As long as data communication or transmission follows this protocol, different systems … Read more
1. Determine the Connection Scheme, as follows: 2. Hardware Wiring The following are the wiring terminals of the touch screen, which has 9 pins, divided into one group of RS232 and another group of RS485. 1) RS232 is used to connect to PLC (COM1) Main Touch Screen Panasonic PLC 2) RS485 is used for connection … Read more
Students often ask questions like when working on a project for their company that requires a touch screen, they want to choose a Weicon touch screen but are unsure which model to select. Here’s a brief response to such queries. In fact, selecting a touch screen should be based on a comprehensive consideration of your … Read more
Search on WeChat Technical Training RS-232, RS-422, and RS-485 are all standards for serial data interfaces; Communication issues are similar to traffic issues, with various situations such as high speed, low speed, congestion, and interruptions. If we compare serial communication to traffic, UART is like a station, and a frame of data is like a … Read more
The RS232 type DB9 interface, which used to be found on older computers, can be connected to modems. In MCU51 microcontroller projects, this UART interface is generally used, with serial port rates of 115200bps, 57600bps, etc. Later, USB to serial converters like PL2302 and FT232 emerged, with rates reaching up to 921600bps, which is considered … Read more
Introduction Previously, we introduced the basic knowledge of I2C and SPI. In this chapter, we will discuss UART (Universal Asynchronous Receiver/Transmitter), which is used for communication between internal and external devices of a computer. Data transmission within a computer is parallel, while data transmission with external devices is often serial. Therefore, a chip is needed … Read more
UART, I2C, RS485… Although these communication methods are commonly used, their explanations can be ambiguous. I felt it necessary to organize them to consolidate and distinguish the concepts. The article is a bit lengthy, so I suggest saving it for future reference when needed. UART Universal Asynchronous Receiver-Transmitter The UART port refers to a physical … Read more
01 Output Forms of Sensors 1. Digital Output Type Digital output primarily includes three forms: RS232, RS485, and wireless transmission. The specific digital output type is chosen based on the actual communication distance and the complexity of the terrain. RS232 output is generally suitable for short-distance transmission within 15 meters and has weak electromagnetic interference … Read more
Learning about microcontrollers is a long and somewhat painful process. Especially for beginners, it is difficult to form a systematic learning framework when various types of knowledge are incomplete in the early stages. This article aims to provide a thought process and list some essential foundational knowledge before getting into microcontrollers. 1. There are only … Read more