Guard <span>Guard</span> is a common concept in Rust, meaning “to guard”. What does it guard? It guards resources, data, etc., within a specific scope. For example, the guards for mutexes and read-write locks are: • <span>MutexGuard</span> • <span>RwLockReadGuard</span> and <span>RwLockWriteGuard</span> They are an implementation of RAII (Resource Acquisition Is Initialization), a resource management technique from … Read more
A few days ago, I saw discussions in the group chat about the issue of “TTL, RS232, and RS485 transmission distances“..Today, I took some time to share related content, hoping it will be helpful to everyone. Overview Many people may not be very familiar with TTL, RS232, and RS485, so let me briefly summarize what … Read more
Click the “blue” above to follow us! Point: 1. The serial port and COM port refer to the physical interface form (hardware). TTL, RS-232, and RS-485 refer to the level standards (electrical signals). 2. When connecting devices, generally only GND, RX, and TX are connected. Vcc or +3.3V power lines are not connected to avoid … Read more
1. The serial port and COM port refer to the physical interface form (hardware), while TTL, RS-232, and RS-485 refer to the level standards (electrical signals). 2. When connecting devices, generally only GND, RX, and TX are connected. The Vcc or +3.3V power line is not connected to avoid conflicts with the power supply of … Read more
RS232 communication, RS485 communication, TTL communication, and CAN communication are commonly used serial communication interface standards, differing in electrical characteristics, communication modes, transmission distances, transmission rates, and application scenarios. RS232 Communication: •RS232 is one of the earliest serial communication standards, established by EIA (Electronic Industries Alliance), primarily used for point-to-point communication between early computers and … Read more
Follow+Star Public Account, don’t miss out on exciting content Author | strongerHuang WeChat Official Account | strongerHuang A few days ago, I saw a discussion in my technical group about the issue of “TTL, RS232, and RS485 transmission distances”. Today I took some time to share related content. Overview Many readers might not know what … Read more
Electronic products, such as computers, mice, chargers, and even cars, have many interfaces around us. This article will introduce you to these interfaces, showing what they look like, where they are used, how to use them, and what their principles are. This article serves as a simple description for beginners. 1. Serial Port 2. UART … Read more
8051 Microcontroller Pin Diagram and Function Introduction Microcontroller Pin Diagram The 40 pins can be roughly divided into four categories based on their functions: power, clock, control, and I/O pins. ⒈ Power: ⑴ VCC – Chip power supply, connect to +5V; ⑵ VSS – Ground terminal; Note: When testing the microcontroller pin current with a … Read more
1. TTL Levels: TTL level signals are most commonly used because data representation typically follows binary rules, where +5V is equivalent to logic ‘1’ and 0V is equivalent to logic ‘0’. This is known as the TTL (Transistor-Transistor Logic) signal system, which is the standard technology for communication between various components within devices controlled by … Read more
1、Serial ports and COM ports refer to the physical interface form (hardware). TTL, RS-232, and RS-485 refer to the level standards (electrical signals). 2、When connecting devices, generally only GND, RX, and TX are connected. The Vcc or +3.3V power line is not connected to avoid conflicts with the power supply of the target device. 3、The … Read more