Information card system communicable in contactless manner

Claim 1

An information card associated with a terminal unit having at least three inductors two of which are respectively assigned to an input signal and a periodical signal depending upon a job assignment and the other of which is selectively supplied with an acknowledge signal and a data output signal, said terminal unit establishing a data communication for said input signal and said output data signal after a receipt of said acknowledge signal, said information card comprising a) at least first, second and third inductors capable of facing said at least three inductors, respectively, and assigned to said input signal, said periodical signal and an output signal consisting of said acknowledge signal and said data output signal, b) a first data processing unit operative to execute program sequences for producing a plurality of output data signals after an initialization, c) a non-volatile memory unit associated with said first data processing unit and operative to memorize pieces of data information each represented by one of said output data signals, d) a first demodulation unit coupled between said first inductor and said first data processing unit and operative to extract a bit string indicative of a piece of input data information from said input signal, and e) a separation unit coupled between said second inductor and said first data processing unit and operative to extract a pulse train from said periodical signal and to produce an electric power on the basis of the periodical signal, characterized by an output unit coupled at an input node thereof to said separation unit and at an control node thereof to said first data processing unit and producing a data output signal in the presence of another output data signal fed from the first data processing unit, and in that said output unit further produces said acknowledge signal in said initialization for transferring to said third inductor as said output signal.