Symbol LS 5700 Product Reference Manual page 185

Code Types & Options
Set Lengths for Code 39
Two Discrete Lengths - This option allows you to decode
only those codes containing two selected lengths. For
example, if you select Code 39 Two Discrete Lengths,
then scan 0, 2, 1, 4, only Code 39 symbols containing 2 or
14 characters are decoded. Numeric bar codes are on
pages 5-246 to 5-255. If you make a mistake, scan
CANCEL on page 5-256.
Selecting this option disables
Note:
Code 39 Decode Performance.
CODE 39 - TWO DISCRETE LENGTHS
Parameter Menus
5-121