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UPC-A Check Digit
This selection allows you to specify whether the check digit should be 
transmitted at the end of the scanned data or not.  
Default = On
.
UPC-A Addenda
This selection adds 2 or 5 digits to the end of all scanned UPC-A data.
Default = Off for both 2 Digit and 5 Digit Addenda.
UPC-A Addenda Required
When 
Required
 is scanned, the scanner will only read UPC-A bar codes 
that have addenda.  You must then turn on  a 2 or 5 digit addenda listed on 
page 6-36.  
Default = Not Required.
* 5 Digit Addenda Off
5 Digit Addenda On
* 2 Digit Addenda Off
2 Digit Addenda On