| 摘要 |
A CWUSB interface 1 is shown installed in a printer 2. The interface allows a computer 3 to send print data to the printer, either wirelessly or in a hard wired manner, for which the computer has an auxiliary communication card 4 having an aerial 5 and the usual Type A USB socket 6. A cable 7 is provided for wired connection. The interface 1 has a WUSB controller 8 with an aerial 9 connected to it, which can co-operate with the aerial 5. The interface also has a Type B USB socket 10 for wired connection. A peripheral device controller 11 is connected to either of the socket 10 or the WUSB controller 8 via a pair of switches 12,14. These are under control of the WUSB controller. Being a wireless device, it can communicate with the computer only if the interface is associated with the computer, that is to say the computer as its host has recorded the full ID of the interface, the interface has recorded the full ID of the host and the host and interface have exchanged encryption keys. This is known as association. Further, the host can only communicate data to the interface when the host has enumerated the interface, that is given the interface the address to which to refer for data to be sent to it. Association and enumeration are to of course standard routines.
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