Back to results
US 5,515,053 AGranted
Transponder and data communications system
AssigneeLicentia Patent-Verwaltlungs-GmbH
InventorsJohannes Hecht, Andreas Peters
Life of this patent
Estimating the term…
Abstract
A transponder as well as a data communications system equipped with such a transponder are described, with which identification and/or individual addressing of the simultaneously present transponders is guaranteed in a simple manner even in the case of the simultaneous presence of a plurality of transponders in the field range of the reader.
Claims11
A transponder with a receiver and transmitter for interacting with an interrogator by means of electromagnetic fields for receiving and/or transmitting information, comprising:
- a transponder containing a code memory, said code memory storing a multi-position transponder code;
- transponder comparator means for comparing each position of a multi-position call code received via electromagnetic fields with each corresponding position of the stored multiposition transponder code, said comparing resulting in a match in the value of a call code position and a corresponding transponder code position when the value is identical and resulting in a match in the value of a call code portion and a corresponding transponder code position when the value of the call code is a predetermined substitute value, said call code having at least one position with said predetermined substitute value;
- and
- a transponder function element connected to said comparator, said function element being triggered by said comparator when each position of said multiposition call code match a corresponding position of said stored transponder code.
1 more element
Data communication system, comprising:
- an interrogator including means for transmitting a multi position first call code which has at least one position with a substitute value, said substitute values designating any value for a position of an individual multi position call code;
- and
- means for receiving a response signal and means for evaluating a response signal including checking the response signal to determine:
- a) the response signal contains information from a plurality of transponders, after which a new call code is transmitted, which contains fewer substitute values than the preceding call code, and the response signal is again checked,
- b) the response signal contains information from only one transponder, after which a measure that may have been intended for the transponder identified is triggered.
2 more elements
Dependencies are inferred from the claim text.