Patent ID: 8674811
Filing Date: 2014-03-18
Classification: H04Q

Abstract:
1. A method for controlling responses of a plurality of radio frequency identification (RFID) tags communicating with an RFID reader, comprising steps of: prompting the plurality of RFID tags to enter a ready state; executing singulation on the plurality of tags to select a first RFID tag; enabling the first RFID tag from the plurality of RFID tags to enter an accessible stage in which data stored in the RFID tag is accessible, wherein the accessible stage comprises an open state and a secured state; providing a first identification code by the RFID reader to the first RFID tag upon entry into the accessible stage, wherein the first identification code identifies the RFID tag being accessed; recording, by the first RFID tag, the open state or the secured state of the first RFID tag as a recorded state; accessing data stored in the first RFID tag when the first RFID tag is in a selected one of the open state and the secured state; wherein the data stored in the first RFID tag comprises a second identification code designated to the first RFID tag and is different from the first identification code; commanding the first RFID tag by the RFID reader to enter a standby state from the selected one of the open state and the secured state by providing a first command comprising the first identification code to the first RFID tag; wherein the standby state is linked to both the open state and the secured state; confirming, by the first RFID tag upon receiving the first command, whether the first identification code in the first command matches with the first identification code of the first RFID tag before entering the standby state; directly returning the first RFID tag from the standby state to the recorded state selected from the open state and the secured state without re-entering any other state upon receiving a second command by the first RFID tag, wherein the second command comprises the first identification code and the second identification code of the first RFID tag; confirming, by the first RFID tag, whether the first identification code and the second identification code contained in the second command match with first identification code and the second identification code stored in the first RFID tag; directly returning the first RFID tag from the standby station to the recorded state upon confirming that the second command first and second identification codes match the first and second stored identification codes; and accessing the data of the first RFID tag again within the recorded state without re-executing singulation for the first RFID tag.