Instructions

16 - 2 DS36X8 Digital Scanner Product Reference Guide
MDF in Hands-Free Mode
MDF in a hands-free scanning mode may yield multiple unexpected and undesired outputs when a label (most
likely on a complex label) passes through the scanner's field of view. This problem happens when the complex
label’s barcodes can be matched by more than one group (for example, Group 1 represents all barcodes present
and Group 2 represent some barcodes present).
The problem is demonstrated in Figure 16-1 and as follows:
1. As the label is moving through the field of view, it is first partially read (some of the barcodes in the field of view
in Frame 2).
2. Then, the second decode occurs as it is fully read (all the barcodes in the field of view in Frame 3).
3. This yields two different outputs (instead of the expected single output) from the presentation of a label. This
problem is driven by a complex label inadvertently matching two different MDF rules/groups, thereby yielding
two outputs.
Figure 16-1 Scanning Label in a Horizontal Orientation
NOTE A similar problem can also occur in the hand-held trigger mode. If multiple MDF rules/groups exist and all
the label is not in the field of view when pressing the trigger, the output may vary depending on which MDF
rules/groups match.
Field of View - Frame 1
No label in field of view
Field of View - Frame 2
2 Barcodes Visible
Partial label in field of view
Match MDF Rule for Group 2
Output 2 barcodes
Field of View - Frame 3
3 Barcodes Visible
Full label in field of view
Match MDF Rule for Group 1
Output 3 barcodes
NOTE To minimize issues associated with MDF hands-free mode, see MDF Best Practices on page 16-3.