Canon PIXMA MG4200 Series On-Screen Manual page 766

The Scan-from-Operation-Panel Settings screen appears.
3.
Select your scanner or printer from Scanners and click OK.
The Bonjour service name set to your scanner or printer is selected by default. When Bonjour is
disabled, the MAC address of your scanner or printer appears.
Note
When multiple scanners are connected via a network, you can select up to three scanners. For
details, see the help file of IJ Network Scanner Selector EX.
4.
Return to the Scan-from-PC Settings screen and click OK.