Rockwell Automation 2755 Enhanced Decoder Series B - Manual (Page 86)

6–13 Configuration: Symbology
Publication 2755-833
(Widest
x 100% = % Bar Tolerance
Wide Bar – Narrowest Wide Bar )
(Widest Wide Bar + Narrowest Wide Bar )
2
OR
(Widest
x 100% = % Bar Tolerance
Narrow
2
Bar – Narrowest Narrow Bar)
(Widest Narrow Bar + Narrowest Narrow Bar)
Select a value that is greater than the worst case tolerance to prevent
no-reads.
Valid bar tolerance values are 5 to 40, or Ignore. The Ignore value
allows any amount of tolerance between bars of the same nominal
width. The default value is 15 (15%). The default value for this
parameter has been optimized for most applications, and it is
unlikely you will ever have a reason to change it.
The decoder will reject a symbol if the width of two bars of the same
nominal width differs by more than the bar tolerance value. Select
Ignore to prevent the decoder from rejecting a symbol based on
width differences between bars of the same nominal width.
Minimum Number of Bars (Pharma-Code Decoders Only)
Field Type Options
Edit 3 through 12 (5)
Specifies the least number of bars that must be present within a
Pharma-Code symbol for the decoder to perform a decode. Possible
values are 3 to 12. The default is 5.
If the Code Verification List contains values, the decoder will ignore
the minimum bar setting and decode only those symbols that have
values in the list.
If the Code Verification List has no values, the decoder will reject all
symbols that contain fewer bars than the minimum bar setting.