Point-of-sale (POS) terminals are electronic data capture (EDC) terminals that a merchant uses at the time and place of a transaction to capture purchaser information from credit cards, debit cards, and smart cards, etc. Point of Service (POS) terminals are used extensively throughout the world by merchants of services and merchandise to facilitate the authorization and consummation of sales transactions with consumers. A POS system has a POS terminal and a store controller or a data server connected thereto. The POS system receives, through a bar code scanner or a keyboard, various kinds of information such as goods codes identifying items of commercial goods, quantities, discounts, corrections and so forth. In accordance with commodity code information read from each bar code, the price of the commodity corresponding to the commodity code is retrieved from a commodity price file (PLU (Price Look Up) file) stored in a server, and a total amount of money of the purchased commodities is calculated to settle the accounts. When the operator confirms that the displayed sales item data matches the menu key that he or she has pressed, a sales registering process is performed corresponding to the searched sales item data. To ensure that the payment information transmitted from the POS terminals to a payment center is not intercepted, this information is typically encrypted and secured through other means (e.g., digital authentication) during transmissions. Devices such as printing apparatuses, e.g., a printer, and input devices, e.g., a bar code reader or a keyboard, are also connected to the POS terminal.
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