Title:
非接触システムにおけるRFカード検知のための方法
Document Type and Number:
Japanese Patent JP2008530654
Kind Code:
A
Abstract:
A method and processor-readable storage medium for performing the method of identifying RF cards in a card reader's field. Polling requests are sent to cards in a card reader's field. Where a clear response from the sent command is received from a responding card, the response is saved, the responding card moved to an Active state, and the timeslot number incremented if possible and the above steps repeated until no clear response is received. Where no clear response is received, a determination of whether a collision has occurred is made. If no collision occurred, the timeslot number is incremented; if a collision did occur, another polling request is sent. Discovered cards are returned when no cards or collisions are detected after every timeslot is polled.
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Inventors:
Dressen, Philip Dee
Application Number:
JP2007554103A
Publication Date:
August 07, 2008
Filing Date:
January 10, 2006
Export Citation:
Assignee:
ATMEL CORPORATION
International Classes:
G06K17/00; H04B1/59
Attorney, Agent or Firm:
Kuro Fukami
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Hisato Noda
Masayuki Sakai
Nobuo Arakawa
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Hisato Noda
Masayuki Sakai
Nobuo Arakawa