 |
Character
set |
What characters
can be represented by the symbology. |
| Check Digit |
This is the last character before the stop character and is
calculated by a formula based on the rest of the data. It is part of some
symbologies and is added to others to increase the security rate. |
| Continuous
bar code |
If barcode
characters contain a space at the end of each character as part of it. |
| Density |
Number
of Data Characters per unit of length, usually inches. |
| Discrete
bar code |
If the
spaces between characters are not part of each character. |
| Element
widths |
Number
of different width elements in the bar code, two width or multiple width. |
| Fixed
length |
Bar code
must have this many characters. |
| One
dimensional bar code |
Symbology
that can be read by drawing a straight line through any part of the bar
code is one dimensional. |
| Module
width |
Width
of the narrowest element. |
| Nominal
width |
Width
of the narrowest element. |
| Quiet
Zone |
This is
the area to left and right of the bar code. It is required on all barcodes,
otherwise any graphics, type or the edges of the item will be interpreted
as a bar. For two dimensional bar codes it is all four sides. Violation
of this rule is one of the three largest causes of bad bar codes. |
| Ratio |
Width
of the wide bars divided by the width of the narrow bars. This is only for
two width bar codes. Violation of this rule is
one of the three largest causes of bad bar codes. |
| Self-Checking |
A single
printing defect will not cause the character to be transposed into another
valid one. |
| Two
dimensional bar code |
Symbology
that has multiple lines or vertically different rows represent different
data. |
| Variable
length |
Bar code
can have as many characters as is required by data. |
| X
|
Width
of the narrowest element. Violation of this rule
is one of the three largest causes of bad bar codes. |
|
|
