Datalogic Scanning QUICKSCAN QS6500BT - Manual (Page 151)

Code 39
Product Reference Guide 6-63
Code 39
The following options apply to the Code 39 symbology.
Disable/Enable Code 39
When this feature is disabled, the imager will not read Code 39 bar
codes.
Checksum Verification
When enabled, the imager will verify the checksum of the labels. Turn
this option on only when a checksum is present in the Code 39 labels.
Checksum Transmit
Enable this option to transmit the checksum with scanned bar code data.