Methods and apparatus for error detection and correction of an electronic shelf label system communication error

  • US 7,007,219 B2
  • Filed: 01/11/2002
  • Issued: 02/28/2006
  • Est. Priority Date: 01/11/2002
  • Status: Active Grant
First Claim
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1. A method of automatically detecting and correcting communication errors which result in incorrect storage of data in an electronic shelf label'"'"'s (ESL'"'"'s) registers, the method comprising the steps of:

  • (a) transmitting an initial message from a host computer to the ESL;

    (b) waiting for a response to the initial message;

    (c) if the response is a negative acknowledgement or no response is received by the host computer, retransmitting the initial message;

    (d) if the response is interpreted by the host computer as a positive acknowledgement, transmitting a verification message to verify the contents of the ESL'"'"'s registers;

    (e) waiting for a response to the verification message; and

    (f) if the response to the verification message indicates that the contents of the ESL'"'"'s registers match the expected contents as maintained by the host computer, logging the initial message as successfully received.

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