Zebra EPL2 Specifications Page 135

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Q. What are Two Dimensional (2D) Bar
Codes?
A. Two Dimensional bar code symbologies
have high data densities and typically include
error correction. Typically, a standard (one di
-
mensional) bar code only encodes a single data
field (e.g. a part number, a name, or P.O. no.).
A two dimensional bar code can typically en
-
code (store) all the fields in a data record up to
the symbology's maximum character count
(many times greater than standard bar code
symbologies).
Q. What makes the two dimensional bar
code different from standard, one dimen
-
sional, bar code?
A. Scanning (machine reading) of two dimen-
sional bar codes is done in both vertical and
horizontal directions. Some two dimensional
bar codes are "stacked" (one dimensional) bar
code lines and others are "matrix" bar codes.
Many two dimensional bar codes support error
correction. This allows data to be read and recov-
ered with less than optimal conditions (even with
some damage to the bar code with some
symbologies). Typically, the error correction level
can be adjusted to favor the amount of data stored
per symbol verses the ability to recover data.
Q. What two dimensional bar codes are
included with Eltron Printers?
A. Eltron printers support MaxiCode, a matrix
bar code, and PDF 417, a stacked bar code,
with Macro PDF also included.
980009-001 Rev.F D-13
Appendix D - Bar Code Information
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