METHOD FOR EXCHANGING DATA BETWEEN AN AUTOMATIC DISPENSER AND A MICROCIRCUIT CARD

摘要

The invention concerns a card comprising a value data capable of being debited by the automatic dispenser in exchange for delivery of an article or a service. The automatic dispenser commands the modification of a ratification indicator, stored in the card non-volatile memory, between two states, namely a ratified state corresponding to the situation where the previous transaction operated with the card, whether with said automatic dispenser or another one, was properly carried out, and a non-ratified state in the event said previous transaction was interrupted during execution. The automatic dispenser successively: conditionally debits the card, if the indicator is in ratified state; commands the card to position the indicator in the non-ratified state if a debit has been performed in the previous step; then commands the delivery of the article or service; and if the article is actually delivered at the previous step, commands the card to position the indicator in ratified state.