Datalogic Scanning QUICKSCAN QS6500BT - Manual (Page 168)

Symbologies
6-80 QuickScan ® QS6500/QS6500 BT
Code 128
The following options apply to the Code 128 symbology.
Disable/Enable Code 128
When this feature is disabled, the imager will not read Code 128 bar
codes.
Checksum Verification
When enabled, the imager will verify the checksum of the labels.
Checksum Transmit
Enable this option to transmit the checksum with scanned bar code data.
Function Code Transmission
Enable this option to transmit the Code 128 function characters 1,2,3
and 4 as hexadecimal values 80,81, 82 and 83 respectively. This feature is
disabled from the factory for all interfaces except Wand Emulation.