Communications: electrical – Systems – Network signaling
Reexamination Certificate
1999-12-16
2001-09-25
Lefkowitz, Edward (Department: 2736)
Communications: electrical
Systems
Network signaling
C340S870030, C342S044000, C342S050000, C342S051000
Reexamination Certificate
active
06294981
ABSTRACT:
This invention concerns a transponder reading device and a control system for controlling the handling and/or processing of transponder-bearing objects by means of transponder reading devices of this type.
A transponder reading device comprising a device to transmit information between a transponder and the transponder reading device in the frequency shift keying method in the high frequency range is known and is marketed for example by the company Texas Instruments under the name TIRIS as a high-frequency identification system. The system essentially consists of two components, namely the transponder and the transponder reading device with aerial. The transponder which is normally minute and battery-free is obtainable as a Read-Only or a Write-Only version and can be flxed to the corresponding objects or built into them. As soon as the transponder gets into the reading range of the antenna of the transponder reading device, it receives a short pulse from the reading unit. Using the energy which it receives from this, the transponder sends back its individual answer-back code or. if it is in the Write-Read version, the information stored in it. It is also written in or back into the transponder via high frequency.
The transmission between the transponder and the transponder reading device occurs in the frequency shift keying process with frequency changes between in particular 123.2 and 134.2 kHz in half-duplex mode. This process is not susceptible to interference and can be implemented economically. This technology enables it to read and write without contact and touch, also through non-metallic materials.
The reading distance of a transponder reading device is dependent upon the type and sensitivity of the aerial and the size of the transponder and can be up to 2 meters, but on average up to approximately half a meter. The interference distance within which a transponder reading device interferes with or renders impossible the read-out of another transponder reading device is generally 1.5 meter, but can be up to 5 meters for the same reasons as in the case of the reading distance. Several transponder reading devices according to prior art which are positioned in a confined space cannot therefore be operated simultaneously, but must either be synchronised or individually triggered.
The task of this invention is therefore to make available a transponder reading device comprising a device to transmit information between a transponder and the transponder reading device in the frequency shift keying method in the high-frequency range, and a control system for controlling the handling of transponder-bearinng objects by means of transponder reading devices of this kind, in which several transponder reading devices can be operated or triggered together in a confined space.
This task is solved by a transponder reading device, with a device for transmitting between information between a transponder and the transponder reading device by a frequency shift keying process in the high frequency range, characterized by a microcontroller which is operated in a decentrally operating control network, which has a device to transmit information between a transponder and the transponder reading device in the frequency shift keying process in the high-frequency range and a micro-controller which can be operated as pant of a decentrally-operating control network.
The above task is furthermore solved by means of a control system for controlling the handling and/or processing of transponder-bearng objects by means of transponder reading devices of this kind, wherein processing stations include transponder reading devices which are jointly connected in a decentrally operating control network; wherein transponder reading devices are provided at handling and/or processing stations and are jointly connected to a control network.
Advantageous configurations of this invention are given in the respective subclaims.
The advantage of this invention lies especially in the fact that the transponder reading device according to the invention is equipped with its own micro-controller, and therefore with its own control unit. The micro-controller is, as a component (“node”) of a control uiUt, able to communicate with other devices of the same or similar design, i.e. to exchange information. Consequently several such devices can be operated simultaneously in the most confined space without interfering with each other. A device which happens to want to start the identification or read-out of information from a transponder asks the other devices of the control network located in the vicinity whether these happen to be in operation or informs these devices when it itself wants to assume operation. By this means it is possible to operate several transponder reading devices simultaneously in a confined and very confined space.
REFERENCES:
patent: 4740792 (1988-04-01), Sagey et al.
patent: 5070334 (1991-12-01), Commissaire et al.
patent: 5144314 (1992-09-01), Malmberg et al.
patent: 5621411 (1997-04-01), Hagl et al.
patent: 6081199 (2000-06-01), Hogl
patent: 6122329 (2000-09-01), Zai et al.
Buchmann Harald
Herrmannsdorfer Dieter
Goins Davetta
Hermos Gesellschft fur Technische Informik mbH
Lefkowitz Edward
Scully Scott Murphy & Presser
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