摘要:
Smart card transactions are described. Operations in which smart cards are replenished with pre-paid sums, even from scattered terminals (10) not connected to a host (20), may be made secure simply by storing in the smart card (40) the number of replenish operations that have been performed. A replenishment counter is provided therefor and incremented every time the card is replenished but not when the card is used for other purposes, such as paying for goods and services. This system is particularly suitable for the collective management of a number of canteens each provided with a plurality of replenishment terminals available to employees.
摘要:
A system including an electronic label (1) provided with an electromagnetic wave transmitting device (8) fastened to a ring (2) at the bottom of the flared protective rim (5), and a data terminal (6) coupled to a removable read/write head (7) which is movable into and out of the flared rim (5) directly opposite the ring (2) bearing the label (1), whereby data may be transmitted between the data terminal (6) and the label. The system may be used for the automatic tracking of items such as gas cylinders.
摘要:
Methods providing simple management of the unilateral exchange of messages between an extremely simplified set of transmitters and a single receiver on a single channel, involving transmission by the receiver (100) of the simplest possible binary signal indicating that the channel is busy as soon as a message from one of the transmitters is detected. Reception of said signal by the other transmitters (102-104) prevents them from transmitting. Collision risks between messages from different transmitters are handled by a set of test (Tt) and standby (Tv, Ta, Tl) periods. The busy signal may be a simple modulated carrier in the case, for example, of UHF transmission. Effective control of badge-based systems, such as access control systems, is thus provided.
摘要:
L'invention concerne les systèmes d'impression automatique recto verso de cartes en noir et blanc et en couleurs. L'invention réside dans le fait que le système comprend au moins une machine d'impression en noir et blanc (2) ou en couleurs (1) du type à tête d'impression thermique devant laquelle défilent simultanément un ruban servant de support à des colorants à déposer et la carte à imprimer et au moins un dispositif de retournement (4) de la carte qui est placé avant ou après ladite machine. L'invention est applicable aux imprimantes de cartes bancaires.