2 Dimensional Symbologies Two Dimensional Bar Codes: A new growth area in the world of bar code is the two-dimensional versions. Several variations of 2D are available and as these do not all comprise bars and spaces the more accurate name of 2D symbologies is used. 2D symbologies provide a means of storing large amounts of data in a very small space. Whether you consider stacked symbologies (linear bar codes stacked on top of each other), matrix symbologies (comprising a matrix of light and dark elements, circles, squares, or hexagons), or packet symbologies (a collection of linear symbols "randomly" arranged on a page). Examples of the three types include PDF417, Code 49 Code 16K (stacked), Code One, MaxiCode, Data Matrix, Aztec Code, QR Code (matrix), and Super Code (packet). Standards for each of these symbologies are either available from AIM or are in progress. Several of these standards have also been submitted to ISO for standardization. 2D symbologies have a major advantage over linear bar codes, they can store vast amounts of data. Individual symbols can store as much as 7000 numeric only or 4200 alpha-numeric characters. Many of the symbologies also have the ability to use a device called structured append that allows messages to be split over multiple symbols, providing almost infinite storage space. The disadvantage of the 2D symbologies is that a special scanner is needed. Matrix symbologies need a vision based scanner to read the data, though some of the stacked symbologies can be read with a rastering laser scanner. Expect to see many new scanners with variations in technology in the next year or so. Contact ScanLink Corp. concerning 2D Applications This document is reprinted by AIM Inc., the world-wide trade association for manufacturers and providers of Automatic Data Collection products, services and supplies. The document is intended as a guide to aid the manufacturer, the consumer, and the general public. AIM USA, its member companies, or individual officers assume no liability for the use of this document. All rights reserved. Reprinted with permission from AIM, Inc Products  |  Our Company  |  Application Solutions  |  News  |  Contact  |  RMA Form  |  Main info@scanlink.net P.O. Box 260 Moorestown, NJ 08057 Phone Toll Free: 1-800-891-1927 Phone NJ: 856-866-9001 Fax: 856-866-1897 ©2004 Scanlink Corp, All Rights Reserved.