![]() It should be noted that where variable length ITF symbols are used without a check digit, there is a danger of the scanner misinterpreting a partially scanned code as a complete code. Outside of the outer case coding environment, Interleaved 2 of 5 is used for a number of bar coding applications with varying lengths of code. The GS1 14 digit ITF case code uses the same check digit calculation as described in the section on the EAN symbology. The above example shows the standard human readable character grouping for the European traded unit code. Interleaved 2 of 5 was chosen for the standard outer carton bar code because it's printed tolerances are sufficient for the highly variable printing techniques used for corrugated cartons.Īt the standard 100% magnification, the amount of variation allowed in bar width is 0.3mm (0.012"). The ratio of narrow bar width to wide bar width can be between 2:1 and 3:1 but in the GS1 specifications for 14 digit shipping (or traded unit) symbols it is fixed at 2.5:1 and this has become the norm. Data is encoded in pairs of digits with the bars representing the first character of a pair and the spaces representing the second character. The Interleaved 2 of 5 symbology was suggested as a way of shortening the length of the code by using the spaces to carry information. Spaces carried no information, and therefore their width was not critical. Code 2 of 5 is numeric and has bars which can be wide or narrow. The Interleaved 2 of 5 (or ITF) code was developed from an earlier symbology called simply Code 2 of 5. ITF-14 barcodes are used to carry the GTIN-14 numbers as assigned by GS1.
0 Comments
Leave a Reply. |