In our March 11th post I briefly described the two types of 2D bar codes—stacked and matrix. Today I’d like to provide some additional information about stacked 2D symbols.
Stacked symbols started as 1D linear codes such as Code 39 and Code 128 that were then stacked in layers to create multi-row symbols. These first symbols included Code 49 and Code 16K. Stacked symbols later evolved to include PDF417 which provided features to increase data capacity, improve data density and strengthen reading reliability. PDF417 also incorporated error detection and correcting techniques. Another type of 2D stacked symbology is SuperCode, this code breaks data into smaller packets and can be used to create symbols in a variety of different shapes. 2D stacked codes are used in a variety of industries and applications, such as:
- Identification cards
- Inventory management