屏幕上所显示的是 CCNA01# ；对于许多设备来说，这是非常典型的，这个提示符实际上嵌入了一些不可见的控制字符。
What shows on the screen is just CCNA01# ; as is typical for many devices, though, this prompt actually embeds invisible control characters.
实时时钟模块是典型的字符设备也是工业控制系统中的重要组成部分。
The RTC module is a typical char device as well as an important part of Industrial Control System.
ASCII设备控制字符最初是用于控制硬件设备的，如：打印机、录音设备。这个字符不属于HTML文档。
ASCII device control characters were originally designed to control hardware devices like printers and tape drives. These characters have nothing to do inside any HTML document.
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