What is the serial port of linux?

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 transmitting data, where TXD is the sending pin. RXD is the receiving pin, and the serial port can be used to connect the computer to other devices to achieve data communication.

The operating system of this tutorial: Linux5.18.14 system, Dell G3 computer.

What is the Linux serial port?

Linux serial port refers to a way of communicating through a physical serial interface (serial port).

The serial port includes DTR, DSR, RTS, CTS, TXD, RXD and other pins for data transmission. Among them, TXD is the transmitting pin and RXD is the receiving pin. You can use the serial port to connect the computer to other devices (such as printers, modems, embedded systems, etc.) to achieve data communication.

The role of Linux serial port

The serial port is widely used 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 implemented in some scenarios, or data needs to be transmitted at low speed.

• Hardware debugging: The serial port can use a specific command set to interact with the hardware to start and debug the hardware.

• Embedded development: Many embedded systems only provide serial port debugging interface.

How to use Linux serial port?

On Linux, the serial device file is usually called `/dev/ttyS*`. You can use the following commands to obtain basic information about the serial port.

$ dmesg | grep tty
[    0.000000] console [tty0] enabled 
[    0.399643] 00:08: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[    7.323590] usb 1-2: cp210x converter now attached to ttyUSB0

In the above output, `/dev/ttyS0` is a physical serial port device. In addition, the serial port can also be accessed through a USB to serial port chip, such as `/dev/ttyUSB

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