Like a serialport, 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)。
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Use the label "serial 1/0", when the interface is serial, the slot number where the module is installed is slot 1, and the port that is being referenced is port 0.