Canon PIXMA MG4200 Series On-Screen Manual page 471

Select either 64 bit or 128 bit.
3. Key Format:
Select either ASCII or Hex.
4. Key ID:
Select the Key ID (index) set to the access point.
Note
When the printer is connected to an AirPort Base Station via a LAN:
When the printer is connected to an AirPort Base Station via a LAN, confirm the settings in
Wireless Security of AirPort Utility.
Select 64 bit if WEP 40 bit is selected for the key length in the AirPort Base Station.
Select 1 for Key ID:. Otherwise your computer will not be able to communicate with the
printer via the access point.
5. Authentication:
Select the authentication method to authenticate the printer's access to the access point.
Normally, select Auto. If you want to specify the method manually, select Open System or
Shared Key according to the setting of the access point.
7.
Click OK.
Important
If the printer cannot communicate with the computer after the encryption type of the printer was
switched, make sure that encryption types for the computer and the access point matches that
set to the printer.
How to Set a WEP/WPA/WPA2 Key
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