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The GS1 Data Matrix barcode is the ISO/IEC 16022 standardized version of the Data Matrix symbology and is formed by adding the FNC1 character in the first position. The GS1-DataMatrix barcode is represented with a finder pattern and a square or rectangular grid of dark and light dots, known as the X-Dimension. The Finder Pattern, or L shaped bars (with solid lines located on the left and bottom of the symbol and dotted lines on the right and top of the symbol) define the size and orientation of the barcode. Data is then encoded in the defined finder pattern matrix.
GS1-DataMatrix barcode symbols may be easily created with IDAutomation Data Matrix products, all of which support GS1 AIs (Application Identifiers) data and the FNC1 (Function 1) symbol character.
The following must all be true to properly create GS1 symbols:
Fig. 1 below is a symbol encoding of the GTIN string (01)3456789012345 with the date field of (15)171231. According to the GS1 Application Identifier specification, an additional FNC1 is not necessary in this symbol because the preceding element string of (01) is a fixed length. Note that when encoding the GTIN within Data Matrix, the 14th digit of the GTIN is not encoded.
|Fig. 1: GS1-DataMatrix symbol encoding multiple element strings with a single FNC1 function.|
|GS1 Data Encoded||(01)3456789012345(15)171231|
|DataToEncode using parentheses||(01)345678901234515171231|
|DataToEncode using ~1||~101345678901234515171231|
|Data Returned from scanner||]d201345678901234515171231|
|Test generation link from bcgen.com||http://www.bcgen.com/demo/IDAutomationStreamingDataMatrix.aspx?D=(01)345678901234515171231&PT=T&MODE=3&X=.2&LM=0.2|
Fig. 2 below is a symbol encoding of the GTIN string (01)10614141543219 with a variable batch element string of (10)3456789 and a variable serial number element string of (21)3456789012. Because the AIs (10) and (21) are both variable, an additional FNC is required between these according to the GS1 Application Identifier specification.
|Fig. 2: GS1-DataMatrix symbol encoding multiple variable element strings.|
|GS1 Data Encoded||(01)10614141543219(10)3456789(21)3456789012|
|DataToEncode using parentheses||(01)10614141543219103456789(21)3456789012|
|DataToEncode using ~1||~10110614141543219103456789~1213456789012|
|Data Returned from scanner||]d20110614141543219103456789<GS>213456789012|
|Test generation link from bcgen.com||http://www.bcgen.com/demo/IDAutomationStreamingDataMatrix.aspx?D=(01)10614141543219103456789(21)3456789012&PT=T&MODE=3&X=.2&LM=0.2|
According to GS1 specifications, when GS1 emulation is enabled, the first FNC1 character should be decoded as "]d2" and any additional FNC1 characters will be decoded as <GS> (ASCII 29). The <GS> function is usually only visible when scanned with the Barcode Scanner ASCII String Decoder. Not all scanners properly decode the first FNC1 character as "]d2". The screenshot below is the decoded symbol of Fig. 2 above scanned with the IDAutomation 2D USB Scanner. To enable this decoding within the scanner, refer to the GS1-DataMatrix emulation programming guide.
Refer to GS1's GS1-Data Matrix Guideline for complete specifications.
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