| 摘要 |
A low cost credit card verifier unit for use in conjunction with a time-shared central processing unit (CPU) or computer in a credit card verification system. The unit includes a tone generator for generating a series of ten tones identifying the code on a crediti card whose status is to be checked. Ten adjustable digit set buttons are manually positioned in accordance with the code on the credit card. In one form of the invention, after the verifier unit is connected to the CPU via a telephone line, a roller is moved from a starting position sequentially over the positioned buttons to depress them and cause them to operate the tone generator which transmits to the CPU a series of ten tones corresponding to the code on the card. After the roller has traversed all the buttons, it is now in a second position. Upon receipt of the tones, the CPU sends back to the verifier unit a status signal which energizes indicating lamps on the unit to indicate the status of the credit card. Moving the roller back to its starting position resets the circuits of the verifier unit to permit another credit card code to be sent to the CPU. The verifier unit also contains means for accessing the CPU and a ready light which is energized by a ready signal transmitted by the CPU when the CPU is ready to accept data. A movable stop on the verifier unit normally prevents the roller from leaving its starting position, but the stop is depressed upon energization of the ready light to permit movement of the roller across the digit set buttons to a second position. Another stop normally prevents the roller from returning from its second position to its starting position, but this stop is depressed by energization of either a status lamp or repeat lamp on the verifier unit. The repeat lamp is energized by a repeat signal transmitted by the CPU when an invalid code is transmitted or upon a CPU malfunction. The repeat lamp is also energized if no signal is received from the CPU a predetermined time after computer access has been indicated. The roller may then be returned to its starting position where it actuates a reset button which de-energizes all the indicating lamps. After each status or repeat signal, the CPU also transmits a disconnect signal which automatically disconnects the verifier unit from the telephone line, thereby keeping telephone company time charges to a minimum. The credit card verifier unit also contains an additional foreign company digit set button for identifying to the CPU the name of the company which issued the particular credit card to be verified. This button is also depressed by the roller and transmits along with the credit card code tones an additional tone identifying the company.
|
