Rockwell Automation 2755 Enhanced Decoder Series B User Manual

Page 85

6–12

Configuration: Symbology

Publication 2755-833

A typical quiet zone value for the Pharma-Code symbology is 5.

Space Tolerance (Pharma-Code Decoders Only)

Field Type Options

Edit

5 through 40 (15)
Ignore

Defines the percent difference (in width) between the narrowest and
widest space elements of the Pharma-Code symbol. Space tolerance
is expressed mathematically as:

(Widest Space + Narrowest Space)

(Widest Space – Narrowest Space)

100% = % Space Tolerance

Select a value that is greater than the worst case tolerance to prevent
no-reads.

Valid percent values are 5 to 40, or Ignore. If set to Ignore any
amount of space tolerance is allowed within the symbol. 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 two spaces within the symbol
differ in width by more than the space tolerance value. Select Ignore
to prevent the decoder from rejecting a symbol based on width
differences between spaces.

Bar Tolerance (Pharma-Code Decoders Only)

Field Type Options

Edit

5 through 40 (15)
Ignore

Defines the percent difference (in width) between two bars of a
symbol that have the same nominal width but the largest width
difference. There are two bar tolerances since Pharma-Code symbols
have wide and narrow bars. Bar tolerance is expressed
mathematically as: