| 摘要 |
A retail outlet, such as a supermarket, contains goods for sale (6) which are collected by a customer and placed in a trolley taken from a collection point (12). The customer is provided with a bar-code reader (3) which has a memory containing data relating to the goods on sale in the supermarket. This data includes, for example, the unit price and unit weight of each item. When the customer selects an item, he scans the bar code on that item using the reader (3) and the price and weight of that item are stored. When the customer has selected all of the goods which he requires, the trolley is weighed at a weighing station (18) which includes a port for the transmission of data between the reader (3) and the weighing station (18). If the total weight of the selected goods stored in the reader (3) matches that measured at the weighing station (18), the data reader is provided with a validation signal, which means that the data reader will be accepted at a payment console (20), so that the customer may pay for the goods and take them from the supermarket without individual checking of the items selected. |
