Glossary — Letter P
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Parity Bit An element added to make the parity of the bars odd or even. Parity Check In most barcodes other than EAN, the black bar module count must be odd or even, achieved by adding a parity bit. A parity check is used to prevent misreading, by checking the odd/even count at each character. PCS Print Contrast Signal. The reflection ratio of the printing color.PCS = (Rw - Rb) / RwThe minimum value of PCS differs depending on the value of Rw. PLU Price Look Up. Ordinarily, price information is not shown in source marked barcodes. The sales price of the same product often changes by retailer, or by season, so the barcode contains only information about the product itself. Sales prices are entered into the store controller, and when product information is input/output at the POS register, the price (of the sale) is simultaneously looked up from the store controller. PLU is the name given to such barcodes. (See NON-PLU) POS Point of Sale. Information management at the point of sale. Prefix Originally the grammatical term "prefix"; in the case of an EAN symbol, since the 12 digits expressed by the bars are not enough, an extra digit is added to the 12 digits, expressed through the combination of odd/even parities in the leftmost six characters. The O(dd)/E(ven) combinations used to express the prefix are as follows:0 = O - O - O - O - O - O |
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