What are the sending and receiving data ends of the serial port?
The sending and receiving data terminals of the serial port are "TXD" and "RXD".
TXD Transmit data Transmit(tx) Data abbreviation
RXD Receive data Receive(rx) Data abbreviation
TXD Network definition: Transmit Data: used on RS232 and UART links.
RXD Network definition: Receive Data: used on RS232 and UART links.
TXD and RXD are terms used in microcontrollers.
Detailed explanation on how to connect RXD and TXD in microcontroller serial port communication:
First of all, you need to understand two concepts, namely DTE and DCE. DTE refers to data terminal equipment. A typical DTE is a computer and a microcontroller. DCE refers to data communication equipment, and a typical DCE is MODEM. RXD and TXD in the RS232 serial port standard are based on DTE, not DCE. After understanding this, it will be easy to understand the following wiring method.
When the microcontroller communicates with the computer via serial port, the RXD of the microcontroller is connected to the TXD of the computer, and the TXD of the microcontroller is connected to the RXD of the computer.
(1) Use serial port straight line. When designing the circuit, the RXD of the microcontroller is connected to the TXD of the circuit board DB9, and the TXD of the microcontroller is connected to the RXD of the circuit board DB9. The specific implementation can be reversed at the 232 level conversion chip.
(2) Use serial port crossover cable. When designing the circuit, because the serial port lines have been crossed, the RXD of the microcontroller is connected to the RXD of the circuit board DB9, and the TXD of the microcontroller is connected to the TXD of the circuit board DB9. They can be connected directly.
This can explain why some circuits use the direct connection method and some circuits use the cross connection method, because the serial lines used are different.
When the microcontroller communicates with serial devices (such as GPRS modules, carrier chips, etc.), always connect RXD and TXD in reverse, that is, the RXD of the microcontroller is connected to the TXD of the device, and the TXD of the microcontroller is connected to the RXD of the device. (Except those whose RXD is specifically marked to be directly connected to the microcontroller RXD, such as Huawei's EM310)
The above is the detailed content of What are the sending and receiving data ends of the serial port?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
WebStorm Mac version
Useful JavaScript development tools
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
