公开(公告)号：US10460137B1

公开(公告)日：2019-10-29

申请号：US15890883

申请日：2018-02-07

Applicant: Amazon Technologies, Inc.

Inventor： Joshua David Landry, Sr. ,  Christopher Raymond Grajewski ,  Oleg Kantor ,  Tak Keung Joseph Lui ,  David Bruce McCalib, Jr. ,  Roman Shmulevich ,  Alton Paul Werronen ,  Fabien Lepoutre ,  Mark G. McDonald ,  Patrick Rubin

IPC: G06K19/07 ,  G06K7/10

Abstract: A method of interrogating a plurality of RFID tags comprises interrogating a first RFID tag with a read command comprising a masking value for a predefined portion of a User Memory Bank of the first RFID tag. The predefined portion stores state information for the first RFID tag. The masking value corresponds to a non-quiesced state relative to the read command interrogation. The method further comprises receiving a response from the first RFID tag that indicates that the first RFID tag is in the non-quiesced state. The method further comprises interrogating the first RFID tag with a write command that instructs the first RFID tag to write a predefined value to the predefined portion of the User Memory Bank, wherein writing the predefined value to the predefined portion places the first RFID tag in a quiesced state relative to a subsequent read command interrogation comprising the masking value.