DataMatrix is a two-dimensional barcode which can store from 1 to about 2,000 characters. The symbol is square and can range from 0.001 inch per side up to 14 inches per side. As an example of density, 500 numeric only characters can be encoded in a 1-inch square using a 24-pin dot matrix printer. The sample shown above encodes 20 ASCII characters.

The code has several other interesting features. Since the information is encoded by absolute dot position rather relative dot position, it is not as susceptible to printing defects as is traditional bar code. The coding scheme has a high level of redundancy with the data "scattered" throughout the symbol. According to the company, this allows the symbol to be read correctly even if part of it is missing. Each Datacode symbol has two adjacent sides printed as solid bars, while the remaining adjacent sides are printed as a series of equally spaced square dots. These patterns are used to indicate both orientation and printing density of the symbol. The code has several other interesting features. Since the information is encoded by absolute dot position rather relative dot position, it is not as susceptible to printing defects as is traditional bar code. The coding scheme has a high level of redundancy with the data "scattered" throughout the symbol. According to the company, this allows the symbol to be read correctly even if part of it is missing. Each Datacode symbol has two adjacent sides printed as solid bars, while the remaining adjacent sides are printed as a series of equally spaced square dots. These patterns are used to indicate both orientation and printing density of the symbol.

DataMatrix is being used to encode product and serial number information on electrical rating plates; to mark of surgical instruments in Japan; to identify lenses, circuit boards, and other items during manufacturing.

DataMatrix symbols require a 2-D scanner; they cannot be read using an ordinary linear barcode scanner. A number of scanners are on the market using both laser and CCD camera technologies. DataMatrix symbols can be printed using most professional-grade thermal transfer label printers on the market. The Barcode Software Center carries several label design and printing programs that can create DataMatrix symbols; we also have function libraries for programmers, programs for creating master artwork, and add-in hardware modules for Hewlett-Packard printers.

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