ttyUSB

ttyUSB is a device file used in Unix-like operating systems to represent serial ports. It is typically found in the /dev directory and is used to communicate with external devices such as modems, GPS receivers, and other serial devices. The ttyUSB interface is part of the Linux kernel's USB serial driver subsystem, which allows the kernel to recognize and manage USB-to-serial converters.

When a USB-to-serial converter is plugged into a computer, the kernel creates a ttyUSB device file for each serial port provided by the converter. These device files are named sequentially, starting with ttyUSB0, ttyUSB1, and so on. Each ttyUSB device file can be accessed using standard file I/O operations, allowing applications to read from and write to the connected device.

ttyUSB devices are often used in embedded systems and IoT (Internet of Things) applications, where serial communication is a common requirement. They are also used in development and debugging scenarios, where a developer may need to communicate with a microcontroller or other embedded device over a serial connection.

In summary, ttyUSB is a device file used to represent serial ports in Unix-like operating systems. It is created by the Linux kernel when a USB-to-serial converter is connected, and it allows applications to communicate with external devices over a serial connection.