LPRF device wake up using wireless tag

  • US 7,742,745 B2
  • Filed: 05/29/2009
  • Issued: 06/22/2010
  • Est. Priority Date: 12/22/2000
  • Status: Active Grant
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First Claim
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1. A communications method comprising:

  • placing a first detectable RFID device having memory onto a pallet,providing a first identification code in the memory to uniquely identify the pallet,using the pallet to transport an object,identifying the object with a second detectable RFID device,producing a second identification code with the second detectable RFID device,copying the second identification code into the memory to indicate a condition of the pallet,transmitting, by the first detectable RFID device, a communication at a first power level such that only a first group of transceivers receive the broadcast, the communication including a command causing each of the first group of transceivers not to respond to a subsequent broadcast; and

    subsequent thereto, andtransmitting, by the first detectable RFID device, a communication at a second power level greater than the first power level such that a second group of transceivers greater than and including the first group of transceivers receive the broadcast, but such that only a limited number of transceivers of the second group respond to the broadcast, the limited number of transceivers excluding the first group of transceivers;

    wherein the plurality of transceivers each are associated with a respective sensor for acquiring data and transmitting the data to the first detectable RFID device.

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