The latter two syntaxes are shown in Data. Three different syntaxes are shown: Plain syntax (just the in a 1D EAN/UPC barcode) GS1 element string syntax GS1 Digital Link syntax, including its compressed form.
The significance of guard lines is that they establish timing (in scanning). This tool is designed to show how different GS1 syntaxes can be used in different data carriers. The last digit R is an error detecting check digit. The first digit L indicates a particular number system to be used by the following digits. The pattern of a UPC is like S LLLLLLMRRRRR RE - here S represents start guard line L represent left section containing six digits M represents middle guard line R represent right section containing six digits and E represents end guard line. Usually these digits are also shown as numerals above or below the UPC. Composition of UPC-AĪ UPC consists of black lines and white spaces which represent 12 digits long GTIN. These codes can be easily scanned using machines and thus it helps in inventory management as well as at the point of sale (check-out desk). UPCs are used in stores to label trade items. In the United States, UPC-A barcode represents the Global Trade Item Number (GTIN). Universal Product Code (UPC) is a barcode, generally used for trade items.
