Don't know how to set scanner for multiple page scan into single pdf file
The supplied Canon software is horrible, but it can be done!
Launch ScanGearStarter, choose advanced tab and click preferences button, then select scan tab.
Untick box "Automatically quit ScanGear....." then click ok.
(This box being ticked totally prevents multipage single file scanning).
Now choose simple mode tab, select the document type, dpi and document size.
Now click the green "Multi Scan" button, place the document on the scanner glas and press next in the new window.
The page will be scanned and the ScanGear window will return, just click "Multi Scan" again and place next document, press next. Keep repeating until all pages are scanned, then close the ScanGear window.
This will bring up a third window showing thumbnails of each page, any of these pages can be deselected if required.
The other important step is to choose from the pull down list Saved as Type: "MultiPagePDF".
Choose the location for saving the file and click save.
Hallelujah! .......stupid software.