Noncontact card and card system

Details Noncontact card and card system Noncontact card and card system

1995-01-20

1997-02-18

Shepperd, John

Registers

Coded record sensors

235449, G06K 500

Patent

active

056043422

ABSTRACT:
An IC card reader/writer includes a control unit incorporating a central processing unit, read only memory, and random access memory. In addition, the reader/writer includes a UART, a sending circuit for modulating a digital signal received from the UART, transmitting and receiving antennas, and a receiving circuit for demodulating received signals. The control unit controls the IC card reader/writer by setting an interval between a trigger signal and a start flag at the time of data transmission equal in duration to at least one frame of data, for example, eight bits of data. In a specific embodiment, the trigger signal may be followed by eight bits of 00.sub.H, followed by a start flag and eight bits of data 5A.sub.H, followed by a data stream including desired information.

REFERENCES:
patent: 5030807 (1991-07-01), Landt et al.
patent: 5418353 (1995-05-01), Katayama et al.

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