Juniper Archer 2 Owner's Manual page 89

For example, below is the screen for Code 39:
Set Length: This option allows you to specify the length of
the barcodes you want to read. This could be useful if you
know that all valid barcodes will be a specific length or a
range of lengths.
You can specify four barcode lengths (let A refer to the
first length field and B refer to the second length field):
1. One Discrete Length – Set A to the discrete length
and B to 0. Only barcodes with an exact length of A
are decoded.
2. Two Discrete Lengths – Set A greater than B (both
non-zero). Only barcodes with lengths A or B are
decoded.
3. Length Within Range – Set A less than B (both
non-zero). Barcodes between and including A and B
are decoded.
4. Any length – Set A to 0. Any barcode length is
decoded.
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Ch 9 Barcode Scanner