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Method, system and devices for data acquisition

  • US 8,674,807 B2
  • Filed: 12/04/2008
  • Issued: 03/18/2014
  • Est. Priority Date: 12/04/2007
  • Status: Active Grant
First Claim
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1. A system for acquisition of data, the system comprising:

  • a plurality of RFID devices, each RFID device comprising a processor, a receiver circuit, a transmitter circuit, and a timer device;

    at least one second device that communicates with said RFID devices, said second device being one of the group consisting of i) a router ii) a master device,wherein each said RFID device is configured to transfer data, on RF channel, to said second device,wherein said second device is configured to transfer an acknowledge message, on the RF channel, to each said RFID device responsive to receipt of the transferred data,wherein each RFID device has an active mode and a power saving mode,wherein in the power saving mode of the RFID device its capability to receive data on the RF channel is lower than in a monitoring and/or receiving period of the active mode, the timer device of each RFID device switching off an operating voltage of the processor, the receiver circuit, and the transmitter circuit in the power saving mode, the timing device remaining active during the power saving mode, andwherein at least one of the RFID devices and the second device monitor RF signal strength on the RF channel, and the transfer of said data and/or acknowledge message is dependent on the value of the indicated signal strength.

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