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UPC-E0 Leading Zero
This feature allows the transmission of a leading zero (0) at the beginning 
of scanned data.  To prevent transmission, scan Off.  
Default = On.
UPC-E0 Addenda
This selection adds 2 or 5 digits to the end of all scanned UPC-E data.
Default = Off for both 2 Digit and 5 Digit Addenda.
UPC-E1
Most U.P.C. bar codes lead with the 0 number system.  For these codes, use 
UPC-E0 (page 7-29).  If you need to read codes that lead with the 1 number 
system, use the UPC-E1 On selection.  
Default = Off.
* 5 Digit Addenda Off
5 Digit Addenda On
* 2 Digit Addenda Off
2 Digit Addenda On