A Data Matrix is a two-dimensional barcode consisting of black and white “cells” or modules . ISO/IEC —Data Matrix bar code symbology specification; ISO/IEC —2-D Print quality standard; ISO/IEC — Symbol. ISO/IEC. Second edition. Information technology — Automatic identification and data capture techniques — Data Matrix bar code symbology. ISO/IEC INFORMATION TECHNOLOGY – AUTOMATIC IDENTIFICATION AND DATA CAPTURETECHNIQUES – DATA MATRIX BAR CODE.

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A Data Matrix is a two-dimensional barcode consisting of black and white “cells” or modules arranged in either a square or rectangular pattern, also known as a matrix.

The information to be encoded can be text or numeric data. Usual data size is from a few bytes up to bytes. The length of the encoded data depends on the number of cells in the matrix. Error correction codes are often used to oso reliability: A Data Matrix symbol can store up to 2, alphanumeric characters.

Data Matrix symbols are rectangular, usually square in shape and composed of square “cells” which represent bits. Depending on the coding idc, a “light” cell represents a 0 and a “dark” cell is a 1, or vice versa. Every Data Matrix is composed of two solid adjacent borders in an “L” shape called the “finder pattern” and two other borders consisting of alternating dark and light “cells” or modules called the “timing pattern”.

Within these borders are rows and columns of cells encoding information. The finder pattern is used to locate and orient the symbol while the timing pattern provides a count of the number of rows and columns in the symbol. As more data is encoded in the symbol, the number of cells rows and columns increases.

Each code is unique. Fidelity of the marking and reading systems are the only limitation. Data Matrix isi are becoming common on printed media such as labels and letters. For industrial engineering purposes, Data Matrix codes can be marked directly onto components, ensuring that only the intended component is identified with the data-matrix-encoded data.

The codes can be marked onto components with various methods, but within the aerospace industry these are commonly industrial ink-jet, dot-peen marking, laser marking, and electrolytic chemical etching ECE.

These methods give a permanent mark which can last up to the lifetime of the component. Data Matrix codes are usually verified using specialist camera equipment and software.

After the component enters service, the Data Matrix code can then be read by a reader camera, which decodes the Data Matrix data which can then be used for a number of purposes, such as movement tracking or inventory stock checks.

Data Matrix codes, along with other open-source codes such as 1D barcodes can also be read with mobile phones by downloading code specific mobile applications. Although the majority of these mobile readers are capable of reading Data Matrix, [ citation needed ] few extend the decoding to enable mobile access and interaction, whereupon the codes can be used securely and across media; for example, in track and trace, anti-counterfeit, e.


Data Matrix codes are used in the food industry in autocoding systems to prevent food products being packaged and dated incorrectly. Codes are maintained internally on a food manufacturers database and associated with each unique product, e.

For each product run the unique code is supplied to the printer. Label artwork is required to allow the 2D Data Matrix to be positioned for optimal scanning. For black on white codes testing isn’t required unless print quality is an issue, but all colour variations need to be tested before production to ensure they are readable.

Data Matrix

The message read ” Hello, World! Data Matrix symbols are made up of modules arranged within a perimeter finder and timing pattern.

The symbol consists of data regions which contain modules set out in a regular array. Large symbols contain several regions. Each data region is delimited by a finder pattern, and this is surrounded on all four sides by a quiet zone border margin. The modules may be round or square- no specific shape is defined in the standard.

For example, dot-peened cells are generally round. Data Matrix has an error rate of less than 1 in 10 million characters scanned. Symbols have an even number of rows and an even number of columns.

All symbols using the ECC error correction can be recognized by the upper-right corner module being the same as the background color. Each varies in the amount of error correction it offers, with ECC offering none, and ECC offering isk greatest. As an added measure, the placement of each bit in the code is determined by bit-placement tables included in the specification.

All symbols utilizing the ECC through error correction can be recognized by the upper-right corner module being the inverse of the background color. The encoding process is described in documents published by ISO web site. The diagrams below illustrate the placement of the message data within a Data Isl symbol.

The message is “Wikipedia”, and it is arranged in a somewhat complicated diagonal pattern starting near the upper-left corner. Some characters are split in two pieces, such as the initial W, and the third ‘i’ is in “corner pattern 2” rather than the usual L-shaped arrangement.

Also shown are the end-of-message code marked Endthe padding P and error correction E bytes, and four modules of unused space X. Multiple encoding modes are used to store different kinds of messages.

Control codes are provided to switch between modes, as ieo below. The C40, Text and X12 modes are potentially more compact for storing text messages. The resulting value of B1 is in the range 0— Character code interpretations are shown in the table below. The C40 and Text modes have four separate sets. Set 0 is the default, uec contains codes that temporarily select a different set for the next character.


The only difference is that they reverse upper-and lower-case letters. C40 is primarily upper-case, with lower-case letters in Set 3. Text is the other way around.

Data Matrix – Wikipedia

It can store digits, upper-case letters, and many punctuation marks, but has no support for lower-case letters. Base mode data starts with a length indicator, followed by a number of data bytes. A length of 1 to is encoded as a single byte, and longer lengths are stored as two bytes. It is desirable to avoid long strings of zeros in the coded message, because they become large blank areas in the Data Matrix symbol, which may cause a scanner to lose synchronization.

In order to make that less likely, the length and data bytes are obscured by adding a pseudorandom value R nwhere n is the position in the byte stream. Prior to the expiration of U. Patent 5, in Novemberintellectual property company Acacia Technologies claimed that Data Matrix was partially covered by its contents.

As the patent owner, Acacia allegedly contacted Data Matrix users demanding license fees related to the patent. Cognex Corporationa large manufacturer of 2D barcode devices, filed a declaratory judgment complaint on 13 March after receiving information that Acacia had contacted its customers demanding licensing fees.

On 19 May Judge Joan N. Ericksen of the U. District Court in Minnesota ruled in favor of Cognex. While the ruling was delivered after the patent expired, it precluded claims for infringement based on use of Data Matrix prior to November A German patent application DE was filed inand published in This patent is not cited in the above US patent applications and might invalidate them.

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