| 摘要 |
PURPOSE:To display using time and using charge when a data device is actuated through a telephone set borrowed at the visited place by providing the data device with a counted value display part for the time information corresponding to the time using the telephone line exclusively. CONSTITUTION:The data device 1 is connected to a transmission/reception control part 5 and a processor 6 in a center unit through a public transmission circuit network 4 by hooking a transmitter/receiver 3 on an acoustic coupler 2. When the operator hooks the transmitter/receiver 3 on the acoustic coupler 2, a hook signal F is transmitted to a control part 7 and a flip flop 8 is set up. Consequently, an AND gate 9 is opened and a clock pulse CL from a pulse generating part 10 starts a clock counter 11. When the transmitter/receiver 3 is removed from the acoustic coupler 2 after completing the transmission/reception of data, the clock counter 11 stops. Clock data T from the clock counter 11 are sent to a display part 17 through a switching part 16 and the using time of the telephone is displayed. |
