Datalogic Scanning I GD4100 - Manual (Page 131)

UPC-A
Product Reference Guide 129
UPC-A
The following options apply to the UPC-A symbology.
UPC-A Enable/Disable
When disabled, the reader will not read UPC-A barcodes.
ENTER/EXIT PROGRAMMING MODE
UPC-A = Disable
UPC-A = Enable
UPC-A Check Character Transmission
Enable this option to transmit the check character along with UPC-A barcode data.
ENTER/EXIT PROGRAMMING MODE
UPC-A Check Character Transmission = Don’t Send
UPC-A Check Character Transmission = Send
DEFAULT
DEFAULT