| 摘要 |
PURPOSE:To use an idle area of a data file to improve the oil supplying efficiency, by securing an access of an oil supplying device to any data file in plural oil supply data storing area after reading the card data delivered to customers. CONSTITUTION:An outdoor data input/output device 3 and an indoor data input/ output device POS4 are connected directly to oil supplying devices 1 and 2 respectively. A control circuit 4i is provided to the POS4. Then a storage circuit 4j containing an oil supply data storage area 4n and a data file 4p and an input device 4l consisting of an arithmetic circuit 4k, a keyboard 4f and a card reader 4a are connected to the circuit 4i. In addition, an output device 4m consisting of a CRT4h, a printer 4g and a cassette 4e is connected to the circuit 4j. The reader 4a reads the data on a card delivered to a customer, and an idle area of the file 4p within the area 4n is retrieved by the circuit 4i. An access is secured for the device 1 or 2, and therefore the oil supplying efficiency is improved. |
