×

ID system and method or writing data in an ID system

  • US 4,827,115 A
  • Filed: 03/08/1988
  • Issued: 05/02/1989
  • Est. Priority Date: 03/16/1987
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of writing data in an ID system comprising a first device which has an electrically readable/writable memory for holding data and which is attached to an article to be identified, and a second device capable of contactless communication with said first device, wherein said first device is provided with first and second temporary storage means in addition to said electrically readable/writable memory, the method comprising the following steps performed in said first device:

  • receiving a write command and write data from said second device and, in response thereto, storing the received write data in said first temporary storage means;

    reading data out of said memory from a location thereof in which the write data is to be written and storing this read data in said second temporary storage means; and

    thereafter writing the write data stored in said first temporary storage means in said location of said memory; and

    the following steps performed in said second device;

    sending a read command to said first device after sending the write command, thereby causing the data written in said memory by the write processing to be read out;

    receiving this read data;

    comparing this received data with write data preserved in said second device;

    outputting a normal write response if the two items of compared data agree;

    causing said first device to send the data stored in said second temporary storage means thereof to said second device if the two items of compared data fail to agree; and

    outputting the data of said second temporary storage means together with a response indicating non-agreement of the compared data.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×