Range; Scan Width; Label Speed; Label Dimensions, Label Density, And Label Ratio - Allen-Bradley 2755-LS7-SB User Manual

5–40 Configuring Your Reader

Range

Adjusting the label's range, if possible, is one of the quickest and
most effective ways to improve decode rates. However, in some
applications you may need to select a less than optimum range, or
one that is beyond the fringes of the ranges.

Scan Width

Increasing scan width will increase the number of scans in a picket
fence oriented application. Scan width is linked with scan range and
changing one will usually require a change in the other.

Label Speed

Applies to both picket fence and step ladder oriented labels. If your
application allows it, label speed (the time in seconds that a label is
fully within the scan width of the reader) is an effective way to alter
the number of scans.

Label Dimensions, Label Density, and Label Ratio

Not usually an option in most applications, but changes to label
parameters can affect number-of-scan calculations and possibly
decode rates.
If your application allows it, shortening the length of a picket fence
label means the label will be in the scan range longer and hence
receive a greater number of scans. Increasing the height of a step
ladder label means it will receive more scans. Changing label
density and/or bar code ratio is another way ranges, decode rates, etc.
can be altered.

Gain

This adjustment, typically made by qualified technicians, is done
from within the Scanner Setup menu.
Publication 2755-6.9