Contactless communication system and data carrier used for...

Details Contactless communication system and data carrier used for... Contactless communication system and data carrier used for...

2007-12-11

2007-12-11

Pezzlo, John (Department: 2616)

Multiplex communications

Duplex

Communication over free space

C370S336000, C370S442000

Reexamination Certificate

active

10274913

ABSTRACT:
To provide a contactless communication system that can reduce a time required to complete an identification of all data carriers that exist around a reader/writer and thus attempt to speed up its processing. According to the contactless communication system, multiple data carriers detect a response requesting command from an access device and send back an individual response signal for one-bit information to the access device at a time that is ordered based on a portion of each carrier's identification information, and the access device monitors individual slots for the response signals and determines that detection of the presence of data carriers is completed when it has obtained individual signals from the data carriers, thereby reducing the time required to complete the identification of all data carriers.

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patent: 6002344 (1999-12-01), Bandy et al.
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patent: WO98/22903 (1998-05-01), None
patent: WO99/65168 (1999-12-01), None

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