How to choose the serial port baud rate?

In practical applications, it is usually necessary to set and adjust the serial port baud rate through software. Most programming languages ​​provide functions or methods for setting the serial port baud rate. Users only need to call these functions or methods to conveniently set and adjust the serial port baud rate. Adjust the serial port baud rate. Due to hardware and software limitations, the actual serial port baud rate may be lower than the set baud rate. This phenomenon is called "baud rate error". In order to reduce the baud rate error, we can take some measures, such as using high-quality serial lines, optimizing software algorithms, etc.

The selection of serial port baud rate needs to be determined according to specific communication needs. If the amount of data to be transmitted is small, you can choose a lower baud rate; if the amount of data to be transmitted is large, you need to choose a higher baud rate. At the same time, communication stability and anti-interference ability also need to be considered. Generally speaking, a higher baud rate can improve the stability and anti-interference ability of communication, but it will also increase the complexity and cost of the hardware. In addition, asynchronous communication does not have a clock synchronization signal, and there is error accumulation in sampling in each byte transmitted. It is generally used for low-speed equipment.

In addition to basic data transmission functions, serial port communication can also implement some advanced functions, such as parity check, data bit check, stop bit setting, etc. These advanced features can further improve the stability and reliability of serial communication. It has been introduced in previous articles, so I will not explain them one by one here.

Serial communication will continue to be widely used for a long time due to its simplicity, reliability, and low cost. Therefore, an in-depth understanding and mastery of serial port baud rate is very necessary for electronic engineers.