Hi,
You've got some work on your hands.
I've dug up some notes:
http://rapidshare.com/files/148998371/Programming_the_Omron_RS_3460__PLUs__cash_register.doc.html
http://rapidshare.com/files/129008315/Alpha_programming_sheet_for_RS3010_and_RS3460.jpg.html
Click the link, wait for rapidshare page, click 'Free user', if you see a counter wait for it, click 'download'
Mark
September 2008