ISO/IEC. Second edition. Information technology — Automatic identification and data capture techniques — Code bar code symbology. Code is a high-density linear barcode symbology defined in ISO/IEC It is used for alphanumeric or numeric-only barcodes. It can encode all. 29 Jun BS ISO/IEC Information technology. Automatic identification and data capture techniques. Code bar code symbology.
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The start symbol and first encoded symbol are in position 1. All widths are multiples of a basic “module”. This section gives the compression strategy. The “Shift” symbol switches a single following symbol’s interpretation between subcodes A and B. Although code set C uses one code symbol to represent two digits, it does not always produce a more compact code than code sets A or B.
The following table details the widths associated with each bar and space for each symbol. Manufacturers of bar code equipment and users of bar code technology require publicly available standard symbology specifications to which they can refer when developing equipment and software.
For example, application identifier indicates that an ISO numeric country code and ship-to postal code follows. 1417 Compression for Bar Codes”.
For instance, encoding the ASCII character “0” can be viewed aswhere a sequence of 1’s is a bar and a sequence of 0’s is a space. The stop pattern permits bidirectional scanning.
Isi initial subset is selected by using the appropriate start symbol. Either solution requires the use of an application or an application add in to calculate the check digit and create the barcode. It specifies the symbology identifier prefix strings for Code symbols. Consider the string ” Especially the ASCII char of value 0 and of value 95 and above may be defined differently eic the font that is installed.
Monday to Friday – This page was last edited on 12 Julyat The checksum is computed over the 155417 values, without regard for which code set is active at the time. For the end user, Code barcodes may be generated by either an outside application to create an image of the barcode, or by a font-based barcode solution.
1.2.1 Normative References
Reading the stop pattern left to right is the stop pattern followed by a 2-unit bar1541 reading the stop pattern right to left is the reverse stop pattern followed by a 2-unit bar. Proof sent to secretariat or FDIS ballot initiated: Three 1’s in sequence indicates a bar three times as thick as a single 1 bar. The rules defining the translation of characters into bar and space patterns, and other ice features of each symbology, are known as the symbology specification.
Final text received or FDIS registered for formal approval. If the following symbol is a shift, then a second symbol will be used to obtain the character.
A scanner seeing the reverse stop symbol then knows it must skip the 2-module bar and read the rest of the ic in reverse.
Code – Wikipedia
For example, given the string “xy23”, ie on barcode length using code set C are achieved only if it is applied to middle part of the string. Optimizing the length of the resulting barcode is important when barcode readers are used which must detect the entire barcode image at once in order to read it, such as common laser scanners.
The technology of bar coding is based on the recognition of patterns encoded in bars and spaces of defined dimensions. Views Read Edit View history.
There are numerous methods of encoding information in bar code form, known as symbologies. Using the example above, an ‘A’ would be depicted with the patternor as widths in the tables below. Each bar or space is 1, 2, 3 or 4 units wide, the sum of the widths of bars must be even 4, 6 or 8 unitsthe sum of the widths of the spaces must be odd 3, 5 or 7 unitsand total 11 units per symbol.
However, this feature is not widely supported. There are possible unit wide symbols, and the code uses all possible symbols. Barcode reader Barcode printer. Within each code set, some of the data code points are reserved for shifting to one of the other two code sets.
Two of the symbols are used for stop end-of-barcode indication, stop and reverse stop. When the stop pattern is read right-to-left, the reverse stop symbol followed by a 2-module bar is recognized.
GSO ISO/IEC – Standards Store – GCC Standardization Organization
Code set C is used to efficiently encode digit strings. For example, using the patternthe run lengths are 1 digit 11 digit 01 digit 13 digit 02 digit 13 digit 0. It is mandatory at the left and right side of the barcode. The sum of the products is then reduced modulo In the past, symbology specifications were developed and published by a number of organizations, resulting in certain instances in conflicting requirements for certain symbologies.