Data transmission system using electronic apparatus having a plurality of transmission protocols
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 3, 1996
Grant Date -
N/A
app pub date -
Mar 22, 1994
filing date -
Mar 23, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
In a data transmission system, a card reader/writer provided in a terminal device and an IC card are connected through a contact unit, the IC card is started in response to a signal from the terminal device via the card reader/writer, and transmission/reception of data is subsequently performed. In this data transmission system, the IC card has a CPU for outputting a predetermined answer-to-reset data after the IC card is started and controlling at least two protocols, and a memory for storing protocol type information for determining a protocol to be used from the protocols. The control unit is operated upon starting the IC card, renews the protocol type information in outputting the answer-to-reset data, and returns the renewed protocol type information to an initial one in response to transmission/reception of the data.
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