| 摘要 |
PURPOSE:To accurately rewrite the remaining amount by erasing the under- process code out of a card when the card is rewritten to the new remaining amount after sale of a coupon. CONSTITUTION:A coupon sale acceptance means 20 decides the presence or absence a process code written on a card 1 when the card is put into a card read/write means 10. Then the means 20 accepts the sale of coupons as long as no under-process code remains. While a remaining amount rewriting means 30 rewrites the remaining amount as long as the selling right is fixed after the sale processing. In this case, the under-process code must always be erased out of the card. Thus it is possible to detect easily that the remaining amount on the card is not rewritten. |
