串行口是计算机一种常用的接口，具有连接线少，通讯简单，得到广泛的使用。常用的串口是RS-232-C接口.

由于Linux引入了设备文件的概念,读写串口可以像读写普通文件一样进行操作，非常简单，方便。-The serial port is a common computer interface, with connecting lines is less simple communication, is widely used. Used serial RS-232-C interface. Because Linux has introduced the concept of a device file, read and write serial can operate like to read and write ordinary file, is very simple and convenient.