Like a serial port, each USB port on a computer is assigned a unique identification number (port id) by the USB controller.
像串行端口一样，计算机上每一个usb端口都由US b控制器指定了一个惟一的标识数字(端口id)。
2
Set the IP address of each controller using the serial port at the back of each enclosure.
使用每个封装背面的串行口设置每个控制器的IP地址。
3
Chapter 4 Display system tells us the working theory of LCD screen controller SED1335. Chapter5-Communication introduces serial communication and USB communication.