EP0961995A1 - Method for identifying a plurality of transponders, analysing device and transponders for implementing said method - Google Patents
Method for identifying a plurality of transponders, analysing device and transponders for implementing said methodInfo
- Publication number
- EP0961995A1 EP0961995A1 EP98959945A EP98959945A EP0961995A1 EP 0961995 A1 EP0961995 A1 EP 0961995A1 EP 98959945 A EP98959945 A EP 98959945A EP 98959945 A EP98959945 A EP 98959945A EP 0961995 A1 EP0961995 A1 EP 0961995A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transponders
- comparison
- transponder
- identification code
- analysis device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10019—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
- G06K7/10029—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the time domain, e.g. using binary tree search or RFID responses allocated to a random time slot
- G06K7/10039—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the time domain, e.g. using binary tree search or RFID responses allocated to a random time slot interrogator driven, i.e. synchronous
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/20—Individual registration on entry or exit involving the use of a pass
- G07C9/28—Individual registration on entry or exit involving the use of a pass the pass enabling tracking or indicating presence
Definitions
- the present invention relates to a method for identifying a plurality of transponders present simultaneously in the field of an analysis device, as well as an analysis device and a set of transponders for the implementation of such a method. .
- EP 0 285 419 which describes an analysis device requiring n successive interrogations to determine an identification code on n bits.
- Such an analysis device is unsuitable for the case where the identification code of each transponder is coded on a large number of bits, for example on 32 bits, and where a large number of transponders, for example more than fifty, are present. simultaneously in the field of the analysis device.
- the object of the present invention is in particular to enable a plurality of transponders to be identified in a relatively short period of time, in order for example to know their number and to be able to address them separately in order to interrogate them.
- the invention achieves this by proposing a new method for identifying a plurality of transponders located in the field of an analysis device, each transponder having in memory a different identification code, this method being characterized by the fact that it comprises the steps consisting in : a) transmitting with the analysis device data to be compared with part of the identification code selected by the analysis device, b) make a comparison within each transponder not yet identified between the data received and the part of its identification code selected by the analysis device, c) transmit with each transponder not yet identified in at least one selected time window among a predetermined set of time windows common to all of the transponders as a function of the result of said comparison, d) analyzing by means of the analysis device the data transmitted by the transponders in said set of time windows, and when the data transmitted by the transponders do not at least partially determine their identification code, start again with modified data so as to lead, at the end of a finite number of iterations, to the transmission by the transponders of data making it possible to determine at
- each transponder includes a comparison register in which the data to be compared is stored.
- This comparison register is preferably arranged to store a plurality of binary words and the identification code also consists of binary words.
- the analysis device modifies a binary word of given weight from the comparison register at the same time and each transponder not yet identified performs the comparison between the binary word recently modified and the binary word of corresponding weight. of the identification code.
- the selection of the part of the identification code to which the comparison must relate is carried out by means of the choice of the weight of each binary word which is newly stored in the comparison register.
- the method according to the invention further comprises the step of: transmitting by means of the analysis device, when the data previously received by the latter make it possible to determine at least part of the identification code of a or several transponders, an order causing the latter to issue their identification code and
- the identification process comprises the steps consisting in: a) transmitting with the analysis device data to be compared with part of the selected identification code by the analysis device, b) make a comparison within each unidentified transponder between the data received and a corresponding part of its identification code, c) transmit with each unidentified transponder in at least one time window chosen from a set of time windows common to all the transponders, d) analyzing by means of the analysis device the data transmitted by the transponders in said set of time windows, and when the data transmitted by the transponders do not make it possible to determine at at least partially the identification code of at least one of the transponders urs, start again with modified data so as to lead, at the end of a finite number of iterations, to the transmission by the data transponders making it possible to at least partially determine the identification code of at least one of the transponders, e) send by means of the analysis device, when the data previously received by the latter
- the method according to the invention further comprises the step consisting, when several different identification codes are transmitted simultaneously by several transponders and jamming, to send new data to be compared with a new part of the identification code of these transponders, other than that already determined by the analysis device, to possibly modify these data until determining this new part of the identification code, and then causing the emission, by the transponder (s) whose new part of the identification code has just been determined, their identification code, and in the event of interference, start again the process of determining the identification code by making the comparison relate to a part not yet determined of the identification code until receiving only from the transponders a single identification code .
- each identified transponder is placed in a standby mode in which l stops transmitting the result of the comparison between the data transmitted by the analysis device and its code. identification.
- each newly identified transponder is placed in said standby mode by transmitting with the analysis device its identification code.
- the identification code is transmitted advantageously by loading said identification code into the comparison register, the transponder whose comparison register is equal to the identification code then being placed in a standby mode.
- the invention also relates to a transponder, of the type comprising an identification code such as a serial number, stored in a memory, and means making it possible to communicate remotely with an analysis device, characterized by the fact that it includes a comparison register in which data originating from the analysis device can be stored, calculation means for comparing at least part of the identification code with at least part of the comparison register and means for emitting the result of this comparison in at least one time window, chosen from a set of time windows, the choice of this time window depending on the result of the comparison.
- an identification code such as a serial number
- Another subject of the invention is an analysis device for a plurality of transponders comprising different identification codes, characterized in that it provides agency processing means for determining the identification code of a plurality of transponders placed in the field of the analysis device, this analysis device being able to a. issue a write order associated with identification data, this order causing the memorization in the transponders of said identification data at an address particular, selected by the analysis device,
- the invention also relates to an analysis device and a set of transponders for implementing the method as defined above.
- a large number of transponders can be identified in a relatively short period of time, even if the identification code of each transponder is coded on a large number of bits, for example 32 bits.
- FIG. 1 is a schematic view representing a set of transponders placed simultaneously in the field of an analysis device
- FIG. 2 represents in isolation and schematically a transponder
- FIG. 3 is a flow diagram illustrating the steps of a first example of implementation of the method making it possible to identify the transponders
- FIG. 4 illustrates the decomposition into bytes of the information stored in the comparison register
- FIG. 5 is a timing diagram representing the various time windows in which the transponders are capable of transmitting the result of the comparison between the comparison register and the serial number in the first example ⁇ e implementation of the invention
- FIG. 6 illustrates the flow of a process for identifying four transponders in accordance with the first example of implementation of the invention
- FIG. 7 illustrates the flow of a process for identifying four transponders in accordance with a second example of implementation of the invention.
- FIG. 1 a plurality of transponders 1 places in the magnetic field of an antenna 2 of an analysis device 3, which comprises a transceiver 4 connected to the antenna 2 and processing means 5 such as a microcomputer for processing the information received by one transceiver 4 and controlling the latter for transmission.
- processing means 5 such as a microcomputer for processing the information received by one transceiver 4 and controlling the latter for transmission.
- the antenna 2 is constituted by a solenoid inside which the field is substantially constant.
- the analysis device 3 is arranged to identify the transponders 1 which are inside the antenna 2, the field being strong enough to provide the transponders with the energy necessary for their activation.
- the transponders 1 are for example in the form of labels and are contained in the same enclosure inside the antenna 2, which has been shown by a broken line.
- the information is exchanged by amplitude modulation of a signal of frequency 125 kHz.
- a transponder 1 is shown in FIG. 2. This comprises an interior antenna 6 coupled to a tuning capacity 7, a rectifier circuit 8 for rectifying the current induced in the antenna 6, a capacity 9 for smoothing the current. thus rectifies and a circuit 10 programs to perform certain functions in response to orders received from the analysis device 3, in particular causing the transmission of data by the transponder, functions which will be specified below.
- the circuit 10 is coupled to a transmitter 11 for modulating and transmitting data to the analysis device 3, by means of the antenna 6, and to a receiver 12 for demodulating and receiving the data transmitted by the analysis device 3 , in a manner known per se
- the transponder 1 also includes a memory 13 of the EEPROM type, associated with the circuit 10
- a serial number S four-byte code S 3 S->, Si, So ", ie 32 bits in total, is written in an erasable manner
- the circuit 10 includes a buffer memory called in the following comparison register H, making it possible to store four bytes of respective addresses H 3 , H 2 , H ! and H 0 , as illustrated in FIG. 4.
- FIG. 3 illustrates a first example of the implementation of the method according to the invention.
- step 20 of the method we begin by making the transponders 1 silent.
- the analysis device 3 sends a specific instruction to the transponders 1 to place them all in a so-called listening mode. , in which they do not transmit except on order, that is to say in response to specific instructions issued by the analysis device 3.
- step 21 it is assumed that all the transponders have been placed in listening mode.
- step 22 the analysis device 3 sends a write order to the address H n of the value m, the value of weight n generally being between 0 and 3, and equal to 0 at the start of the identification process.
- the value m is coded on 8 bits and it is generally between the hexadecimal values 0 and FF. This value m is initially taken equal to the hexadecimal value 80.
- step 23 all the transponders 1 store the value m at the address H n , that is to say the value 80 at the address H 0 at the start of the identification process.
- the transponders 1 carry out in step 24 the comparison of the content of this address H n with the corresponding byte S n of the serial number.
- n is equal to 0 and the transponders 1 therefore carry out the comparison between the least significant byte H 0 of the comparison register H and the least significant byte S 0 of the number of series.
- the comparison in question consists in determining whether the value m stored at the address H n is greater than, equal to or less than S vigorous.
- the transponder 1 When the comparison does not relate to the least significant byte S 0 , the transponder 1 also checks in the example describes whether there is a tie between the contents of each less significant address and each corresponding byte of the serial number.
- the transponder 1 checks whether there is equality between the bytes Si and S 0 and the content of the addresses Hi and H 0 respectively.
- each transponder 1 transmits in step 25 in a time window predetermined, unless it has been placed by the analysis device in a standby mode, as will be described below.
- the transmission of the transponders 1 takes place in the example described in one of four groups G 3 , G 2 , Gj and G 0 of three time windows each, each group G n being associated with a value different from the weight n.
- the first group G 3 time windows extends between the instants ti and t 4 , the second group G between the instants t 4 and t ⁇ , the third group G ⁇ between the instants t 7 and tio and the fourth group G 0 between the instants t 10 and t ⁇ 3 .
- the instant tx is located at a predetermined time interval from the end of the transmission of the data by the analysis device.
- step 26 the analysis device 3 analyzes the responses from the transponders 1.
- the first case corresponds to the reception of a signal 111 by the analysis device 3, that is to say the binary value 1 in each of the three time windows of the same group G n allocated to the result of the comparison between the content of the address H n of the comparison register and the byte S n of the serial number; this means ⁇ j 'there is at least one transponder 1 whose byte S n is less than the content of the address H n , at least one transponder 1 whose byte S n is equal to the content of the address H n and at least one transponder 1 whose byte S n is greater than the content of the address H n .
- the second case corresponds to the reception by the analysis device 3 of the signal 100, that is to say the binary value 1 in the first time window only of the group G n considered; this means that all the transponders 1 have their byte S n less than the value m stored at the address H n of their comparison register H.
- the third case corresponds to reception by the device for analyzing the signal 110, c ' that is to say the binary value 1 in the first two time windows of the group considered; this means that the transponders 1 have the byte S n is less than or equal to the value m and that there is no transponder 1 whose byte S n is greater than the content of the address H n of the register for comparison.
- the fourth case corresponds to the reception of the signal 011, that is to say the binary value 1 in the last two time windows; this means that the byte S n of the transponders 1 is either equal to or greater than the content of the address H n of the comparison register H.
- the fifth case corresponds to the reception of the signal 001, that is to say the binary value 1 in the last time window only of the group G n considers; this means that all the transponders have the byte S n greater than the content of the address H n of the comparison register.
- the sixth case corresponds to the reception of the signal 101, that is to say the binary value 1 in the first and last time windows of the group G n only; this means that some transponders have their byte S n less than the content of the address H n and that the others have their byte S n greater than the content of the address H n .
- the seventh case corresponds to the reception of the signal 010, that is to say the binary value 1 in the second time window only of the group G n ; this means that all the transponders have their byte S n equal to the content of the address H n .
- step 27 if no transoon ⁇ eur has the byte S n of its serial number equal to the value m stored at the address H n of the comparison register H, the value m is modified and one returns to step 22, as illustrated by the arrow 28.
- the choice of the new value m depends on the situation in which we find our: if all the transponders have their byte S n greater than the value m then the latter is increased; if on the other hand all the transponders have their byte S n less than the value m, then the latter is on the contrary decreased.
- the value m is modified without changing the value n so as to obtain as quickly as possible, by dichotomy, the value for which there is equality between the byte S n and the content of the address H n for at least one transponder, a maximum of eight iterations; if we have both transponders 1 whose byte S n is greater than the value m, and transponders whose byte S n is less than the value m, we are only interested at first 'to the transponders for which the byte S n is greater than the value m for example, then in a second time, to the others.
- the transponder (s) concerned simultaneously transmit in step 31 the four bytes S 3 , S 2 , S] and S 0 composing their serial number S. If there is only one transponder 1 which responds, the analysis device 3 is capable, in step 33, of analyzing and reading this serial number in order to memorize it in step 34 and then resuming the process to identify the remaining transponders.
- the value of the byte Si is thus determined and if necessary, that is to say if several transponders still have their equal serial numbers out of 16 bits, the value of the byte S 2 is also determined, which is exceptional.
- Each identified transponder is placed in a listening mode, in which it stops transmitting the result of the comparison between its serial number and the comparison register H, by loading the latter with the serial number.
- the analysis device receives the signal 110 in the group G 0 of time windows associated with the byte S 0 , that is to say that at least one of the four transponders emits the binary value 1 in the time window elapsing between the instants tu and t ->, which means that the least significant byte S 0 of the serial number of at least one of the transponders is equal to 80.
- the analysis device 3 can read the serial number 12345680 transmitted by this transponder and store it.
- the analysis device 3 successively sends the write orders of the value 56 to the address Hi of the comparison register, of the value 34 to the address H 2 of the comparison register and the value 12 in the most significant H 3 byte of the comparison register.
- transponder Once this transponder is put on standby, there are still three transponders to identify, namely the transponders having serial numbers 12345678, 65432178 and 55555578.
- the analysis device 3 knows, due to the detection of the binary value 1 in the time window comprised between the times ti 2 and t 13 , that all the remaining transponders have the byte S 0 less than the hexadecimal value 80 contained at the address H 0 of the comparison register.
- the analysis device 3 then sends the write order to the address H 0 of the hexadecimal value 40, to which the transponders respond by transmitting the signal 001 in the group G 0 of time windows, that is to say ie the binary value 1 in the time window between the instants t 12 and t 13 , since they all have their byte S 0 greater than 40.
- the analysis device 3 again modifies the content of the address H 0 of the comparison register by taking each time half the interval whose limits are respectively greater and less than the value to be determined.
- the analysis device 3 thus successively sends the write orders to the address H 0 of the register for comparing the hexadecimal values 60, then 70 and finally 78.
- the analysis device 3 then receives from the three transponders the binary value 1 in the time window which extends between the instants tu and t 12 .
- II can occur, exceptional case illustrated by example considers that the comparison register of a transponder finds itself loaded by chance with the value of its serial number during successive iterations aimed at identifying the transponders.
- the transponder transmits the binary value 1 in the second time windows of the four groups G 3 , G 2 , G x and G 0 of time windows in order to signal to the analysis device 3 that there is equality between each byte from the comparison register and each byte from the serial number.
- this identified transponder goes to sleep, but the analysis device was able to memorize its serial number, equal to 12345678 in this case.
- the analysis device 3 sends a read command to request that or those of the transponders which have the byte S D of their serial number ending with the hexadecimal value 78 to transmit.
- the two not yet identified transponders answer at the same time and as the serial numbers are different, there is jamming of the information.
- the analysis device 3 is therefore unable to read the serial numbers and deduces therefrom that there are at least two transponders whose serial number ends with the hexadecimal value 78.
- the analysis device 3 therefore begins a new identification process by each time modifying the content of the address H lf without changing the content of the address H ⁇ .
- the hexadecimal value 80 is initially loaded at the address H x .
- the transponders respond in groups Gi and G 0 of time windows, the signal received in group G ! being 100 because the two remaining transponders have their octet Si lower than the hexadecimal value 80.
- the analysis device 3 then halves the content of the address Hi of the comparison register, which causes the binary value 1 to be sent in the time windows between the times t 7 and t 8 and t 5 and t ⁇ 0 , since among the two transponders, one has its byte ⁇ ! less than the hexadecimal value 40 and the other has its byte ⁇ ! greater than the hexadecimal value 40.
- the analysis device 3 is only initially interested in the 'transponder whose byte S. is greater than the value hexadecimal 40 and will modify it by dichotomy until reaching the hexadecimal value 55, which causes the emission of the binary value 1 in the time window extending between the instants t ⁇ and t 9 .
- the analysis device 3 receives this serial number and then loads at the address H 2 of the comparison register and at the address H 3 of the comparison register the hexadecimal value 55 for put this transponder in standby mode.
- the analysis device 3 which memorized the fact that there were several transponders whose least significant byte of the serial number was equal to the hexadecimal value 78, and which has just identified one by doing bring the comparisons to the most significant byte If, sends a new read order intended to cause the emission by the remaining transponder (s) whose byte S 0 is equal to the hexadecimal value 78, of its or their number series.
- the analysis device 3 then loads into the comparison register the value of this serial number, which puts this transponder on standby.
- each transponder is identified in a relatively small number of iterations, which makes it possible to quickly identify a large number of transponders, each transponder being identified in 250 ms in average for example.
- the content of the comparison register is never reset to 00000000.
- each transponder transmits only in the time window G n corresponding to the weight n of the byte last loaded in the comparison register, and the comparison register is reset to 00000000 each time the serial number of a transponder is determined.
- the transponders la to ld include a comparison register H identical to that of the transponders previously described.
- the transponders la a ld are agency to transmit the result of the comparison between the last binary word Hn stored in the comparison register H and the word Sn of corresponding weight of the serial number S, in one of three time windows of a group Gc of three time windows corresponding respectively to the cases where the result of the comparison is less, equal or greater, these three time windows extending respectively between the times ti and t 2 , t 2 and t 3 , t 3 and t.
- the transponders la a ld transmit the result of the comparison relating to a byte S surof their serial number only if the bytes S m of lower weight of their serial number with m between 0 and n-1 are respectively equal to the corresponding bytes H m of the comparison register.
- the transponders la a ld are furthermore arranged to transmit in a fourth time window Ge extending between times t 4 and t 5 when the serial number is equal to the content of the comparison register.
- the transponder which has just emitted in this fourth time window places itself in a standby mode for the rest of the identification process.
- the analysis device 3 is here able to analyze the response of the transponders not yet identified in the four aforementioned time windows, namely the three time windows of the set Gc corresponding to the results of the comparisons carried out by the transponders not yet identified between the identification data recently stored in the transponders and a part of their identification code determined by the address selected by the analysis device and the fourth time window Ge corresponding to the fact that the identification code of a transponder is equal to all of the identification data stored by this transponder at the various addresses selected.
- the transponders la and le whose corresponding byte of the serial number is 78 transmit in the time window between the times ti and t 2 to signal to the analysis device 3 that the value of the byte S 0 corresponding to their number of series is less than 80.
- the transponders lb and ld transmit in the time window extending between times t 2 and t 3 to indicate to the analysis device 3 that the value of the corresponding byte of their serial number is equal to 80.
- the analysis device then requests the transponders which replied in the second time window to transmit their serial number.
- the transponders 1b and 1d transmit simultaneously and there is a collision, which the analysis device 3 detects.
- the analysis device 3 then loads the hexadecimal value 80 into the immediately higher byte of the comparison register, namely the byte Hj.
- the transponders lb and ld then respond in the first time window.
- the analysis device 3 transmits again to modify the value of the byte H t of the comparison register and bring it to 40. This time, the transpon ⁇ eurs lb and ld transmit ⁇ ans ⁇ a third time window, since the value of the corresponding byte Si of their serial number is greater than 40.
- the analysis device 3 proceeds by dichotomy and after several iterations ends up loading the hexadecimal value 56 in the Hi byte.
- the transponders lb and ld respond in the second time window.
- the analysis device 3 again requests all the transponders which have just replied in the second time window to transmit their serial number.
- the transponders 1b and 1d still respond at the same time, which causes a collision detected by the analysis device 3.
- the transponders lb and ld respond in the first time window.
- the analysis device 3 then reduces the value of the byte H 2 by half, and this becomes 40.
- the transponders lb and ld still respond in the first time window.
- the value of the byte H 2 is equal to the hexadecimal value 34 and the transponders lb and ld respond in the second time window.
- the analysis device 3 again asks the transponders that have just answered in the second time window to send their identification code.
- the transponders lb and ld respond simultaneously, which again causes a collision detected by the analysis device 3.
- the latter then loads into the byte H3 of the transponder comparison register the value 80 and after a certain number of iterations, as illustrated in FIG. 7, the value of the register H 3 is equal to 10.
- Only the transponder ld then transmits in the second time window, and since the content of the comparison register is then equal to the serial number, this transponder ld also broadcasts in the fourth time window.
- the analysis device 3 detects this transmission and stores the content of the comparison register.
- the transponder ld which has just emitted in the fourth time window goes into standby mode.
- the analysis device 3 requests the other transponders, having previously responded to the order to send their serial number, to send it again This request is made by sending the transponders the order to 'send their number series if the value of the H 2 byte (that is to say the byte of weight immediately lower than that H 3 to which the last modifications of the comparison register relate) is equal to the S- byte, corresponding to their serial number.
- the transponder 1b is then the only one to transmit its serial number, the byte S 3 of which is equal to 12.
- the analysis device then loads the value 12 into the byte H 3 of the comparison register to place the transponder 1b in standby mode.
- the analysis device 3 then resumes the identification process by modifying the value of the byte Ho of the comparison register and by dichotomy this value ends up being equal to 78.
- the transponder then responds to it in the second and fourth time windows and then goes into standby mode.
- the analysis device 3 then requests all the other transponders having replied in the second time window to send their identification code.
- the analysis device loads the comparison register with the serial number of this transponder, so as to place it in standby mode.
- the data transmitted by the transponders are preceded and followed by a synchronization signal.
- the comparison register comprises four bytes, but it can, in a variant not shown, comprise more or less than four binary words of more or less 8 bits. Knowing the serial numbers makes it possible to know the number of transponders present in the field of antenna 2 and to be able to address them individually.
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Abstract
Description
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Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9715624A FR2772164B1 (en) | 1997-12-10 | 1997-12-10 | METHOD FOR IDENTIFYING A PLURALITY OF TRANSPONDERS, ANALYSIS DEVICE AND TRANSPONDERS FOR CARRYING OUT SUCH A METHOD |
FR9715624 | 1997-12-10 | ||
PCT/FR1998/002682 WO1999030286A1 (en) | 1997-12-10 | 1998-12-10 | Method for identifying a plurality of transponders, analysing device and transponders for implementing said method |
Publications (1)
Publication Number | Publication Date |
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EP0961995A1 true EP0961995A1 (en) | 1999-12-08 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP98959945A Withdrawn EP0961995A1 (en) | 1997-12-10 | 1998-12-10 | Method for identifying a plurality of transponders, analysing device and transponders for implementing said method |
Country Status (23)
Country | Link |
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US (1) | US6483426B1 (en) |
EP (1) | EP0961995A1 (en) |
JP (1) | JP3731755B2 (en) |
KR (1) | KR100402664B1 (en) |
CN (1) | CN1173191C (en) |
AU (1) | AU754569B2 (en) |
BR (1) | BR9807561A (en) |
CA (1) | CA2280186C (en) |
FR (1) | FR2772164B1 (en) |
HK (1) | HK1023830A1 (en) |
HU (1) | HUP0001254A3 (en) |
ID (1) | ID27678A (en) |
IL (3) | IL130951A (en) |
MY (1) | MY129534A (en) |
NO (1) | NO993827L (en) |
NZ (1) | NZ336732A (en) |
PL (1) | PL189951B1 (en) |
RU (1) | RU2210109C2 (en) |
TR (1) | TR199901858T1 (en) |
TW (1) | TW471227B (en) |
UA (1) | UA55441C2 (en) |
WO (1) | WO1999030286A1 (en) |
ZA (1) | ZA9811325B (en) |
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DE10010585A1 (en) * | 2000-03-03 | 2001-09-13 | Atmel Germany Gmbh | Process for the transmission of data |
US20030169169A1 (en) * | 2000-08-17 | 2003-09-11 | Luc Wuidart | Antenna generating an electromagnetic field for transponder |
FR2823339A1 (en) | 2001-04-04 | 2002-10-11 | St Microelectronics Sa | CONTACTLESS INTEGRATED CIRCUIT COMPRISING A CABLE LOGIC ANTI-COLLISION CIRCUIT |
FR2834811B1 (en) * | 2002-01-17 | 2004-04-16 | A S K | ANTI-COLLISION METHOD OF ELEMENTS TO BE IDENTIFIED BY A HOST COMPUTER |
DE10211080A1 (en) * | 2002-03-13 | 2003-10-09 | Oce Printing Systems Gmbh | Methods, device systems and computer programs for generating printed documents with a unique identifier |
US7239229B2 (en) * | 2002-09-05 | 2007-07-03 | Honeywell International Inc. | Efficient protocol for reading RFID tags |
KR100470769B1 (en) * | 2002-11-11 | 2005-03-11 | 주식회사 마이크로트랙 | Method and system for anti-collision between transponders |
US7023342B2 (en) | 2003-09-17 | 2006-04-04 | The United States Of America As Represented By The Secretary Of The Navy | Continuous wave (CW)—fixed multiple frequency triggered, radio frequency identification (RFID) tag and system and method employing same |
GB2410161B (en) * | 2004-01-16 | 2008-09-03 | Btg Int Ltd | Method and system for calculating and verifying the integrity of data in data transmission system |
US7342895B2 (en) * | 2004-01-30 | 2008-03-11 | Mark Serpa | Method and system for peer-to-peer wireless communication over unlicensed communication spectrum |
GB2410867B (en) * | 2004-02-06 | 2009-04-08 | Btg Int Ltd | Selection and arbitration method and system |
US7391320B1 (en) * | 2005-04-01 | 2008-06-24 | Horizon Hobby, Inc. | Method and system for controlling radio controlled devices |
KR100667344B1 (en) * | 2005-04-15 | 2007-01-15 | 삼성전자주식회사 | RFID tag and RFID reader for anti-collision and operating method thereof |
KR100737855B1 (en) * | 2005-11-29 | 2007-07-12 | 삼성전자주식회사 | Single side band response method on Radio Frequency Identification Tag |
US8207826B2 (en) * | 2006-10-03 | 2012-06-26 | Ncr Corporation | Methods and apparatus for analyzing signal conditions affecting operation of an RFID communication device |
US20100039236A1 (en) * | 2008-08-14 | 2010-02-18 | Greenlee Kenneth L | Time-based operational window for rfid tags |
US8508356B2 (en) * | 2009-02-18 | 2013-08-13 | Gary Stephen Shuster | Sound or radiation triggered locating device with activity sensor |
US10224757B2 (en) | 2016-12-28 | 2019-03-05 | Texas Instruments Incorporated | Methods and apparatus for antenna signal limiter for radio frequency identification transponder |
US10038579B1 (en) * | 2017-03-15 | 2018-07-31 | Texas Instruments Incorporated | Integrated circuits and transponder circuitry with shared modulation capacitor for 3D transponder uplink modulation |
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US5489908A (en) * | 1994-07-27 | 1996-02-06 | Texas Instruments Deutschland Gmbh | Apparatus and method for identifying multiple transponders |
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1997
- 1997-12-10 FR FR9715624A patent/FR2772164B1/en not_active Expired - Fee Related
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1998
- 1998-10-12 UA UA99084541A patent/UA55441C2/en unknown
- 1998-12-07 US US09/207,317 patent/US6483426B1/en not_active Expired - Fee Related
- 1998-12-09 MY MYPI98005564A patent/MY129534A/en unknown
- 1998-12-10 IL IL13095198A patent/IL130951A/en not_active IP Right Cessation
- 1998-12-10 NZ NZ336732A patent/NZ336732A/en unknown
- 1998-12-10 TR TR1999/01858T patent/TR199901858T1/en unknown
- 1998-12-10 KR KR10-1999-7007222A patent/KR100402664B1/en not_active IP Right Cessation
- 1998-12-10 TW TW087120528A patent/TW471227B/en active
- 1998-12-10 EP EP98959945A patent/EP0961995A1/en not_active Withdrawn
- 1998-12-10 BR BR9807561-6A patent/BR9807561A/en not_active IP Right Cessation
- 1998-12-10 JP JP53025999A patent/JP3731755B2/en not_active Expired - Fee Related
- 1998-12-10 CN CNB98802375XA patent/CN1173191C/en not_active Expired - Fee Related
- 1998-12-10 HU HU0001254A patent/HUP0001254A3/en unknown
- 1998-12-10 ID IDW990794D patent/ID27678A/en unknown
- 1998-12-10 WO PCT/FR1998/002682 patent/WO1999030286A1/en not_active Application Discontinuation
- 1998-12-10 ZA ZA9811325A patent/ZA9811325B/en unknown
- 1998-12-10 CA CA002280186A patent/CA2280186C/en not_active Expired - Fee Related
- 1998-12-10 PL PL98335000A patent/PL189951B1/en not_active IP Right Cessation
- 1998-12-10 AU AU15667/99A patent/AU754569B2/en not_active Ceased
- 1998-12-10 RU RU99119107/09A patent/RU2210109C2/en not_active IP Right Cessation
- 1998-12-10 IL IL15257998A patent/IL152579A0/en not_active IP Right Cessation
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1999
- 1999-08-09 NO NO993827A patent/NO993827L/en not_active Application Discontinuation
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2000
- 2000-05-15 HK HK00102859A patent/HK1023830A1/en not_active IP Right Cessation
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2002
- 2002-10-31 IL IL152579A patent/IL152579A/en unknown
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US6483426B1 (en) | 2002-11-19 |
CA2280186C (en) | 2004-06-22 |
CN1246946A (en) | 2000-03-08 |
WO1999030286A1 (en) | 1999-06-17 |
HUP0001254A1 (en) | 2000-08-28 |
BR9807561A (en) | 2000-02-01 |
HUP0001254A3 (en) | 2004-01-28 |
PL335000A1 (en) | 2000-03-27 |
TR199901858T1 (en) | 2000-04-21 |
RU2210109C2 (en) | 2003-08-10 |
JP2001505699A (en) | 2001-04-24 |
NO993827D0 (en) | 1999-08-09 |
MY129534A (en) | 2007-04-30 |
NO993827L (en) | 1999-10-11 |
NZ336732A (en) | 2001-01-26 |
IL130951A (en) | 2003-02-12 |
KR20000070957A (en) | 2000-11-25 |
AU754569B2 (en) | 2002-11-21 |
FR2772164B1 (en) | 2000-02-11 |
ID27678A (en) | 2001-04-19 |
IL152579A0 (en) | 2003-05-29 |
PL189951B1 (en) | 2005-10-31 |
TW471227B (en) | 2002-01-01 |
CA2280186A1 (en) | 1999-06-17 |
UA55441C2 (en) | 2003-04-15 |
ZA9811325B (en) | 1999-06-14 |
CN1173191C (en) | 2004-10-27 |
KR100402664B1 (en) | 2003-10-22 |
HK1023830A1 (en) | 2000-09-22 |
FR2772164A1 (en) | 1999-06-11 |
AU1566799A (en) | 1999-06-28 |
IL152579A (en) | 2006-04-10 |
IL130951A0 (en) | 2001-01-28 |
JP3731755B2 (en) | 2006-01-05 |
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