Understanding UART and RS232 Serial Communication
2023/9/21 15:05:41
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Serial communication is one of the important ways of data transmission between computers and external devices. In serial communication, Uart serial port and RS232 serial port are two common concepts, which play an important role in data transmission and application fields. This article will go into depth Discuss the differences and connections between Uart serial port and RS232 serial port to help readers better understand these two serial communication methods.
Basic concepts of Uart serial port and RS232 serial port
First, let us understand the basic concepts of Uart serial port and RS232 serial port.
Uart serial port (Universal Asynchronous Receiver/Transmitter) is a universal serial communication interface, which is used to transmit data through serial lines. The Uart serial port is usually integrated in microcontrollers and microprocessors. Used to implement communication with external devices, such as sensors\displays\GPS receivers, etc. The Uart serial port transmits data in an asynchronous manner, that is, data is sent at fixed time intervals, and the receiving end uses a clock signal to synchronize the reception of data.
RS232 serial port (Recommended Standard 232) is a physical layer communication protocol used to define the electrical characteristics and signal transmission specifications of the serial communication interface. RS232 usually uses DB9 or DB25 connectors to support two-way communication. It can be used to connect computers and external devices, such as modems, printers, serial mice, etc. RS232 communication uses asynchronous transmission. Data is transmitted through serial lines, and its level specification is between plus and minus 12 volts.
The difference between Uart serial port and RS232 serial port
Now, let's take a look at the difference between Uart serial port and RS232 serial port.
1. Communication method
- Uart serial port: using asynchronous communication mode, data is sent at fixed time intervals.
- RS232 serial port: also uses asynchronous communication and sends data at fixed time intervals.
2. Application fields
- Uart serial port: usually integrated in microcontrollers and microprocessors, used for communication between embedded systems and peripheral devices.
- RS232 serial port: mainly used for communication between computers and external devices, such as modems\printers, etc.
3. Voltage level
- Uart serial port: Its voltage level is usually low, suitable for microcontrollers and embedded systems.
- RS232 serial port: Its voltage level is higher, plus or minus 12 volts, suitable for longer distance communication and external device connection.
4. Connector Type
- Uart serial port: usually uses a smaller connector, such as a single-pin or multi-pin connector.
- RS232 serial port: usually uses DB9 or DB25 connectors, which are larger and more durable and suitable for connecting computers and external devices.
5. Electrical Characteristics
- Uart serial port: The electrical characteristics are relatively simple, usually only the sending and receiving pins need to be connected.
- RS232 serial port: The electrical characteristics are complex and issues such as level conversion and current limitation need to be considered.
The connection between Uart serial port and RS232 serial port
Although there are some important differences between the Uart serial port and the RS232 serial port, there are also connections between them. The main points of contact include:
1. Data transmission
Both Uart serial port and RS232 serial port are used for data transmission. They both support two-way communication and can send and receive data.
2. Baud rate
Whether it is a Uart serial port or an RS232 serial port, different baud rates can be set to control the data transmission rate.
3. Application fields
Although the application fields of Uart serial port and RS232 serial port are different, they both play an important role in computers and electronic devices. Uart serial port is often used in embedded systems and peripheral devices, while RS232 serial port is usually used for communication between computers and external devices. Communication.
4. Adaptability
In some cases, the Uart serial port can pass
Appropriate level conversion and cable selection to achieve connection with RS232 devices. This adaptability allows the Uart serial port to communicate with RS232 devices.
in conclusion
Uart serial port and RS232 serial port are two important concepts in the field of serial communication. They both play an important role in data transmission, baud rate control and communication applications. Understanding their differences and connections will help to better select and configure serial communication. solutions to meet the needs of specific applications. Whether in embedded systems or in the computer field, serial communication will continue to play a key role in helping to achieve reliable data exchange between devices.