Symbol Technologies LS 2106 - Manual (Page 49)

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Parameter Menus
Transmit Code 39 Check Digit
Scan this symbol if you want to transmit the check digit with the data.
TRANSMIT CODE 39 CHECK DIGIT
(ENABLE)
Do Not Transmit Code 39 Check Digit
Scan this symbol if you want to transmit the data without the check digit.
DO NOT TRANSMIT CODE 39 CHECK DIGIT
(DISABLE)