data matrix code

The data matrix code is a matrix code specified by AIM-International(Automatic Identification Manufacturer), comparable to the QR code. As with other 2D codes, the code field in the classic data matrix code is square - although there is also a rectangular version - and has lines, the finding pattern, on two outer edges to mark the position. The other two outer edges have an alternating black and white pattern, the Alternating Pattern, which serves to orient the readers. This allows the code field to be recognized by the 2D code reader in any position.

Structure and characteristics of the Data Matrix code

The Data Matrix code can consist of one or more data fields. The information elements are dark or light square areas. The data capacity of the code field depends on the character set and the size and is max. 1,556 bytes, which corresponds to 2,335 ASCII characters with 7 bits and 3,116 numeric characters. The identification pattern located at the four outer edges contains the size of the code field and the number of rows and columns in addition to the positioning. Furthermore, in addition to the data, the code field also contains the EDAC code (Error Detection And Correction) for error detection and correction.

Data Matrix code with identification pattern and data area

This means that the data content of the Data Matrix code can still be reconstructed even in the event of severe damage, even if 25% of the code has been destroyed. The error rate of the Data Matrix code is very low and in the worst case is one error within 10 MB of data, in the best case one error within 600 MB .

Data Matrix code as a postage stamp, photo: philaseiten.de

The Data Matrix code was specified by ISO/ IEC and standardized by the Automatic Identification Manufacturer (AIM). It is one of the better known 2D codes and is mainly used for marking articles. For example, in automotive technology, measurement technology and medical technology, on tickets or as postage stamps.