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Specifications
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POSTNET The Postal Numeric Encoding Technique (POSTNET) uses binary digits,
represented as full bars and half bars, to provide a numeric bar code symbology that is
easily read and decoded by optical reading systems. POSTNET provides both error
detection and correction capabilities.
UPC Universal Product Code (UPC) is a subset of EAN. It is a fixed length, numeric,
continuous symbology employing four element widths. Two common types of UPC are
Version A, which encodes 12 digits, and Version E, which encodes 6 digits. UPC has
been used in the supermarket industry since 1973. UPC supplemental code is intended
for only periodical issue numbers.
2D Symbologies
2D symbologies provide a more efficient way of encoding data than standard bar code
symbologies. 2D symbologies use two dimensions to hold data instead of one, allowing
much more information to be stored in a smaller amount of space. The printer can print
both stacked and matrix 2D symbologies.
2D Stacked Symbologies
2D stacked symbologies consist of short linear segments stacked on top of each other.
In addition to being able to condense a large amount of information into the stacked
format, PDF417 provides an extensive error detection and correction option. Up to 510
characters can be recovered if they are lost due to an error in scanning or if the label is
damaged. 2D stacked symbologies can be scanned with a laser scanner or imaging
device that features 2D code scanning capability.
Code 16K Introduced in 1988, Code 16K is an alphanumeric symbology similar to
Code 49 in that it employs multiple rows (from 2 to 16). Each row is fixed length and
uses a mirror image of the Code 128 coding patterns.
Code 49 Code 49 is an alphanumeric symbology developed in 1987 as a means of
labeling very small objects. A Code 49 bar code contains from two to eight adjacent
rows, each separated by a one-module separator bar.
PDF417 PDF417 is a stacked 2D symbology that provides the ability to scan across
rows of code. Each row consists of start/stop characters, row identifiers, and symbol
characters (called “codewords”). Each codeword consists of four bars and four spaces
and contain the actual data. In addition to being able to condense a large amount of
information into the stacked format, PDF417 provides an extensive error detection and
correction option. Up to 510 characters can be recovered if they are lost due to an error
in scanning or if the label is damaged. PDF417 codes can be scanned with a laser
scanner or imaging device that features 2D code scanning capability.
MicroPDF417 MicroPDF417 is a 2D symbology, derived from PDF 417. You use
MicroPDF417 for applications needing improved area efficiency but without the
requirement for PDF417’s maximum data capacity. MicroPDF417 replaces PDF417’s
17-module-wide start/stop patterns and left/right row indicators with a unique set of 10module-wide Row Address Patterns, which were designed both to reduce overall
symbol width and to enable linear scanning at row heights as low as 2X.
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