Noncontact card and card system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 18, 1997
Grant Date -
N/A
app pub date -
Jan 20, 1995
filing date -
Mar 30, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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