When learning Linux for the first time, we need to understand the professional terminology, so that we can be more comfortable and improve efficiency in the next learning process. So what does serial port mean in Linux? The so-called serial port is the abbreviation of serial interface. Next, let's take a look at the specific content introduction.
What is a Linux serial port?
Linux serial port refers to a way of communicating through a physical serial interface.
The serial port includes DTR, DSR, RTS, CTS, TXD, RXD and other pins for data transmission. Among them, TXD is the sending pin and RXD is the receiving pin. Use the serial port to connect the computer with other devices, such as printers, modems, embedded systems, etc., to achieve data communication.
The role of Linux serial port
The serial port has a wide range of applications in the computer field, and mainly has the following functions:
Data transmission: The serial port can realize two-way transmission of data, for example, Ethernet cannot be realized in some scenarios, or data that requires low-speed transmission.
Hardware debugging: The serial port can use a specific command set to interact with the hardware to realize hardware startup and debugging.
Embedded development: Many embedded systems only provide a serial debugging interface.
How to use the Linux serial port?
On Linux, the serial device files are usually called `/dev/ttyS*`. You can use the following commands to obtain basic information about the serial port.
In the above output, `/dev/ttyS0` is a physical serial port device, and the serial port can also be accessed through a USB-to-serial port chip, such as `/dev/ttyUSB.