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4420 and 4440 Bar Code Label Printer User’s Manual
A-10
2D Matrix Symbologies
2D matrix symbologies, such as Maxicode, use both the horizontal and vertical
axes to encode data even more efficiently than stacked symbologies. 2D matrix
codes are created as a matrix of square elements, with each element being either
white or black to encode data in a binary code. Extensive error detection and
correction codes are appended to 2D matrix symbologies, often automatically.
2D matrix symbologies generally cannot be read with a laser scanner. Instead,
they are read by a digital imager that captures the entire symbol at once instead
of scanning each component individually. Since the components of 2D matrix
symbologies are decoded after the image is captured, they permit very fast data
collection.
Data Matrix
Data Matrix is a 2D matrix symbology which is made up of square
modules arranged within a perimeter finder pattern. The finder pattern is a
perimeter to the data region and is one module wide. Two adjacent sides are
solid dark lines. These lines are used to define physical size, orientation, and
symbol distortion.
Maxicode
Maxicode is a fixed-size symbology that is made up of offset rows of
hexagonal elements arranged around a bullseye finder pattern. Each hexagon
represents one bit of information and is either black or white depending on the
state of the encoded data bit. United Parcel Service (UPS) Research and
Development developed Maxicode for the specific purpose of encoding
information about a parcel.
This symbology only encodes very specific data that is divided into the
following fields: a 5-digit zip code, a 4-digit zip code extension, a 3-digit
country code, a 3-digit class of service, and a string of uppercase letters,
numbers, or limited punctuation marks.
QR Code
QR (Quick Response) Code is a matrix 2D symbology that encodes
data into patterns consisting of black and white dots or modules. A three
position detection pattern enables omni-directional reading and ultra high-
speed reading. QR Code can handle a wide range of data, including numerical,
alphabetical, Kanji, Hiragana, Katakana, graphics, and control codes. A built-in
error correction function enables the QR Code to repair errors in the code.