Did you notice yesterday that in the article titled “Understanding PLC Communication Protocols: Types, Meanings, and Their Advantages and Disadvantages” there was no mention of “the commonly referred to 485 and CAN protocols”? Many people think of the “485 communication protocol” as an independent protocol, but strictly speaking, RS-485 (or EIA-485) is not a communication … Read more
[Image] In industrial field applications, there are many bus application scenarios, such as RS-232 and RS-485 conversion with bidirectional isolation, and shared interfaces between RS-485 and RS-422. This article will introduce solutions for these types of applications, which are not only simple and convenient but also enhance communication reliability. The high-performance RS-232 to RS-485 bidirectional … Read more
1. The wiring between RS-232 and TTL mainly involves voltage conversion, as RS-232 uses negative logic levels (+3V to +15V represents logic low, -3V to -15V represents logic high), while TTL uses positive logic levels (0V represents logic low, 3.3V or5V represents logic high).When no data is transmitted on the serial data line, it is … Read more
This article aims to provide you with an intuitive understanding of Modbus, summarizing knowledge related to Modbus, making it very suitable for beginners. If there are any errors, suggestions and corrections are welcome. What is a Protocol Before understanding what Modbus is, let’s first look at what a protocol is. A protocol is a Chinese … Read more
The RS-232 standard was jointly established by the Electronic Industries Association (EIA) of the United States and companies like Bell Systems in 1970, originally aimed at standardizing serial binary data exchange between Data Terminal Equipment (DTE) (such as computers) and Data Communication Equipment (DCE) (such as modems). It employs serial communication, transmitting data one bit … Read more
In job interviews, the characteristics of communication protocols are a common question. Below is a summary of the basic characteristics of several common communication protocols: Communication Protocol Sync/Async Serial/Parallel Full-Duplex/Half-Duplex/Single-Duplex Main Features I²C (Inter-Integrated Circuit) Sync Serial Half-Duplex Multi-master and multi-slave, uses SDA and SCL lines, supports 7-bit and 10-bit addresses, low speed but suitable … 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
The RS-232 interface complies with the serial data communication interface standard set by the Electronic Industries Alliance (EIA) in the United States, originally designated as EIA-RS-232 (abbreviated as 232 or RS232). It is widely used for connecting computer serial interface peripherals. RS-232 is one of the mainstream serial communication interfaces today. Due to the early … Read more
Follow + Star our official account to not miss exciting content Author | A Person and a Team Official WeChat Account | A Person and a Team According to technical specifications and electrical interfaces, there are three common serial data standards: RS-232, RS-422, and RS-485. This article will introduce cable termination techniques, the use of … Read more