Method of reading a plurality of non-contact data carriers, including an anti-collision scheme
First Claim
1. A method of inventorying data carriers by means of a communication station, wherein said communication station and each data carrier are brought into communicative connection, and wherein each data carrier brought into communicative connection with the communication station generates a response signal enabling the inventorying of the data carrier after at least one operational condition has been fulfilled and supplies said response signal using a transmission start moment that can be chosen from a plurality of transmission start moments, and wherein each data carrier before providing its response signal tests whether another data carrier is already providing its response signal, and wherein each data carrier discontinues the provision of its response signal if another data carrier is already giving its response signal.
13 Assignments
0 Petitions
Accused Products
Abstract
A method of inventorying data carriers (2) by means of a communication station, whereby the communication station and each data carrier (2) are brought into communicative connection, and each data carrier (2) brought into communicative connection with the communication station is capable of generating a response signal (IDS) that renders possible an inventorying of the data carrier and is capable of delivering a generated response signal (IDS) with the use of a transmission start moment that can be selected from a plurality of transmission start moments (t5, t6), each data carrier tests whether another data carrier (2) is already giving its response signal (IDS). Each data carrier (2) subsequently discontinues the generation or delivery of its response signal (IDS) if another data carrier (2) is already providing its response signal (IDS).
-
Citations
15 Claims
-
1. A method of inventorying data carriers by means of a communication station,
wherein said communication station and each data carrier are brought into communicative connection, and wherein each data carrier brought into communicative connection with the communication station generates a response signal enabling the inventorying of the data carrier after at least one operational condition has been fulfilled and supplies said response signal using a transmission start moment that can be chosen from a plurality of transmission start moments, and wherein each data carrier before providing its response signal tests whether another data carrier is already providing its response signal, and wherein each data carrier discontinues the provision of its response signal if another data carrier is already giving its response signal.
-
8. A data carrier, which data carrier is designed for contactless communication with a communication station and which comprises an integrated circuit, which integrated circuit comprises the following means:
- response signal generation means for generating a response signal start moment selection means by which a transmission start moment can be selected from a plurality of transmission start moments and response signal recognition means designed for recognizing a response signal given by another data carrier and for generating and delivering a response signal recognition signal and wherein delivery decision means are provided which release or block a delivery of the response signal in dependence on the response signal recognition signal and the transmission start moment.
- View Dependent Claims (9, 10, 11)
-
12. An integrated circuit for a data carrier which data carrier is designed for contactless communication with a communication station, said integrated circuit comprising the following means:
- response signal generation means for generating a response signal start moment selection means by which a transmission start moment can be selected from a plurality of transmission start moments and response signal recognition means designed for recognizing a response signal given by another data carrier and for generating and delivering a response signal recognition signal and wherein delivery decision means are provided which release or block a delivery of the response signal in dependence on the response signal recognition signal and the transmission start moment.
- View Dependent Claims (13, 14, 15)
Specification