DataMatrix

Data Matrix is a high-density, error-resilient 2D barcode capable of encoding up to about 2,000 characters in a compact square symbol.

Data Matrix 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 than relative dot position, it is not as susceptible to printing defects as traditional bar codes are. 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 Data Matrix 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 the orientation and the printing density of the symbol.

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

Data Matrix 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. Data Matrix 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 Data Matrix symbols; there are also function libraries for programmers, programs for creating master artwork, and add-in hardware modules for Hewlett-Packard printers.

Legacy links (no longer active) (1)

• www.rvsi.com