JP2016218829A - RFID tag and RFID system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a configuration having an RFID tag with a first mode to transmit/receive a signal and a second mode only to receive a signal, which shifts from a second mode to a first mode when receiving a start instruction in the second mode, in which, when the RFID tag shifts from the second mode to the first mode by receiving the start instruction, and then receives the same start instruction in a state of shifting to the second mode again, the RFID tag is prevented from shifting to the first mode again.SOLUTION: When an RFID tag shifts from a second mode only to receive a signal to a first mode to transmit/receive a signal by receiving a start instruction, and then receives the start instruction in a state of shifting to the second mode again, the RFID tag is prevented from shifting from the second mode to the first mode when identification information received with the start instruction is the same as identification information received with the start instruction when the RFID tag shifts from the second mode to the first mode.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an RFID tag and an RFID system using the RFID tag, and in particular, a first mode in which the RFID tag transmits and receives signals and a second mode in which the RFID tag only receives signals are used in the surrounding environment and usage. The present invention relates to a technique for transition according to conditions.

  In recent years, with the progress of an information-oriented society, information is recorded on tags attached to products and the like, and products and the like are managed using the tags. In information management using such a tag, an RFID tag capable of writing and reading information by non-contact communication with the tag is rapidly spreading due to its excellent convenience.

  As the RFID tag, an active RFID tag capable of communicating over a long distance of about several tens of meters with a built-in power supply is often used in order to reduce the size and ensure a communicable distance. Such an active RFID tag starts signal transmission / reception triggered by a trigger signal transmitted from a reader (see, for example, Patent Document 1). Therefore, it is necessary to make the trigger signal receivable by the RFID tag, and power consumption is increased.

  Therefore, it is conceivable that an event signal is periodically transmitted from the RFID tag side and signal transmission / reception is started by receiving a response signal from a reader that has received the event signal. Since the transmission of the event signal can be performed with a setting shorter than the time for which the trigger signal from the reader can be received, the power consumption of the RFID tag can be reduced.

  By the way, products managed using RFID tags as described above may be transported in areas where transmission of radio waves is prohibited, such as by air. In that case, the event signal cannot be periodically transmitted from the RFID tag as described above, and therefore, the RFID tag is set in a state in which the signal can be received, and power consumption is increased.

  In view of such problems, the applicant of the present invention transmits a signal corresponding to the command signal when the communication unit that transmits and receives the signal transmits the event signal and receives the command signal corresponding to the event signal. Transition to the first mode when a command signal for transitioning to the first mode is received in the second mode. I came up with an RFID tag. In this technology, transmission of radio waves is prohibited because the communication unit for transmitting and receiving signals transitions to a first mode for transmitting and receiving signals and a second mode for only receiving signals. When the RFID tag passes through the designated area, the communication unit is set to the second mode. In other cases, the communication unit is set to the first mode, so that the power consumption depends on the surrounding environment and usage conditions. Will be able to control.

JP 2011-76477 A

  When managing the transportation status of goods using the RFID tags as described above, the RFID tag is attached to the goods, etc., and the goods etc. It is possible to manage which base has passed. For this reason, it is necessary to set the communication unit in the first mode for transmitting and receiving signals at a transit base for products and the like. On the other hand, during the transportation of goods and the like, since the goods and the like may pass through an area where transmission of radio waves is prohibited as described above, the communication unit enters the second mode in which only signal reception is performed. Need to be.

  Therefore, in the system using the RFID tag described above, an activation instruction for causing the communication unit to transition to the first mode with respect to the RFID tag in which the communication unit is in the second mode at the transit point of the product or the like. Is transmitted from the reader, and the RFID tag receives the activation instruction, thereby causing the communication unit to transition from the second mode to the first mode. Then, after the ID written in the RFID tag is read at the transit point of the product etc., the communication unit transitions again to the second mode according to the instruction from the reader, and the product etc. exits the transit point in that state. By doing so, it is possible to transport products and the like in areas where transmission of radio waves is prohibited, such as by air.

  However, even when the reading of the ID for the RFID tag attached to the product or the like is completed at the transit point of the product or the like and the communication unit transitions again from the first mode to the second mode, the transit point is particularly When a product or the like stays at the passage base in a wide case, the RFID tag may receive the activation instruction transmitted from the reader again. In that case, there is a possibility that the communication unit transits again from the second mode to the first mode and leaves the passage base in that state. If a product or the like leaves the transit base while the communication unit is in the first mode, then the product or the like cannot be transported to an area where transmission of radio waves is prohibited. There is a problem.

  The present invention has been made in view of the problems of the conventional techniques as described above, and includes a first mode for transmitting and receiving signals and a second mode for only receiving signals, In the RFID tag that transitions to the first mode when the activation instruction is received in the second mode and the RFID system using the RFID tag, the first mode is changed from the second mode when the RFID tag receives the activation instruction. Provided are an RFID tag capable of avoiding transition to the first mode again when the same activation instruction is received in the state of transition to the second mode again after transition to, and an RFID system using the same For the purpose.

In order to achieve the above object, the present invention provides:
A communication unit comprising a first mode for transmitting and receiving signals and a second mode for only receiving signals;
When the communication unit receives an activation instruction in the state of the second mode, the communication unit is shifted to the first mode, and the communication unit is in a state of the first mode and a predetermined condition is satisfied. A state transition unit that transitions the communication unit to the second mode when satisfied;
When the communication unit that has transitioned from the second mode to the first mode receives the activation instruction in a state in which the communication unit has transitioned again to the second mode, the identification information received together with the activation instruction, and the communication unit A determination unit for determining whether or not the identification information received together with the activation instruction when the transition from the second mode to the first mode is the same,
When the determination unit determines that the two identification information is not the same, the state transition unit changes the communication unit from the second mode to the first mode, and the determination unit When it is determined that the two pieces of identification information are the same, the communication unit is not changed from the second mode to the first mode.

  In the present invention configured as described above, when the activation instruction is received in the state of the second mode in which only the signal reception is performed in the communication unit, the communication unit enters the first mode in which the signal is transmitted and received. When the activation instruction is received in a state in which the communication unit has transitioned again to the second mode because the predetermined condition has been satisfied, the identification information received together with the activation instruction and the communication unit It is determined whether the identification information received together with the activation instruction when transitioning from the second mode to the first mode is the same, and if it is determined that the two identification information is not the same, the communication unit When the transition from the second mode to the first mode is made, but it is determined that the two pieces of identification information are the same, the communication unit does not transition from the second mode to the first mode. Start-up When the same activation instruction is received in a state in which the communication unit transitions from the second mode to the first mode and then transitions to the second mode again by receiving the indication, the communication unit Transition to the mode again is avoided. As a result, reading of the ID is completed for the RFID tag attached to the product etc. at the transit point of the product etc., and the RFID tag is activated after the communication unit transitions again from the first mode to the second mode. Even when the instruction is received again, the communication unit does not transit from the second mode to the first mode again, and the communication unit passes in the first mode for transmitting and receiving signals. Leaving the base is avoided.

The RFID tag that operates as described above is
Activation instruction means for transmitting the activation instruction together with identification information capable of identifying itself;
When the communication unit then transmits a transition instruction for causing the communication unit to transition to the second mode to the RFID tag that has transitioned to the first mode, the communication unit performs the second operation. The identification information received together with the activation instruction when transitioning from the first mode to the first mode is received together with the activation instruction in a state where the communication unit has transitioned from the first mode to the second mode. In this case, the communication unit may be used in an RFID system including a tag communication unit that transmits a transition prohibition instruction that instructs not to transition the communication unit from the second mode to the first mode.
When the state transition unit receives the transition instruction and the transition prohibition instruction when the communication unit is in the state of the first mode, it is assumed that the predetermined condition is satisfied by the reception of the transition instruction. Even if the activation instruction is received after that, the identification information received together with the activation instruction in the determination unit according to the transition prohibition instruction, and the communication unit When it is determined that the identification information received when transitioning from the second mode to the first mode is the same, the communication unit is not transitioned from the second mode to the first mode. It will be.

In addition, the RFID system as described above is
The tag communication means transmits the identification information of the activation instruction means included in the transition prohibition instruction,
When the determination unit receives the activation instruction in a state where the communication unit transitions from the first mode to the second mode, the determination unit is included in the identification information received together with the activation instruction and the transition prohibition instruction It can be considered that the identification information is determined to be the same.

  In such a configuration, when the transition prohibition instruction transmitted from the tag communication unit includes the identification information of the activation instruction unit, the communication unit transitions from the second mode to the first mode. It is not necessary to store the identification information received by the RFID tag together with the activation instruction.

In addition, the RFID system as described above is
The determination unit stores in the storage unit the identification information received together with the activation instruction when the communication unit transitions from the second mode to the first mode,
When the tag communication unit receives the activation instruction in a state where the communication unit has transitioned from the first mode to the second mode with respect to the RFID tag, the identification information received together with the activation instruction Is transmitted as the transition prohibition instruction not to transition the communication unit from the second mode to the first mode when the same as the identification information stored in the storage unit,
When the determination unit receives the activation instruction in a state where the communication unit transitions from the first mode to the second mode, the identification information received together with the activation instruction is stored in the storage unit It can be considered that the identification information is determined to be the same.

  In such a configuration, it is not necessary for the tag communication means to grasp the identification information transmitted together with the activation instruction from the activation instruction means, and versatility can be improved.

  According to the present invention, when the communication unit receives the activation instruction, the second mode in which only the signal is received is changed to the first mode in which the signal is transmitted and received, and then the second mode is changed again. If the identification information received together with the activation instruction is the same as the identification information received together with the activation instruction when the communication unit transitions from the second mode to the first mode, Since the communication unit is configured not to transit from the second mode to the first mode, the communication unit transits from the second mode to the first mode after receiving the activation instruction, and then transits to the second mode again. It is possible to avoid transition to the first mode again when the same activation instruction is received in the state.

  In addition, for the activation instruction means for transmitting the activation instruction together with identification information capable of identifying itself and the RFID tag in which the communication unit has transitioned to the first mode, the communication unit is to transition to the second mode thereafter. When transmitting the transition instruction, the communication unit transitions from the first mode to the second mode with the identification information received together with the activation instruction when the communication unit transitions from the second mode to the first mode. In the RFID system having a tag communication unit that transmits a transition prohibition instruction that instructs not to shift the communication unit from the second mode to the first mode when received together with the activation instruction in the state, the tag communication unit includes: When the identification information of the activation instructing means is included in the transition prohibition instruction and transmitted, and the determination unit receives the activation instruction in a state where the communication unit has transitioned from the first mode to the second mode, this activation In the case of judging whether the identification information received together with the indication and the identification information included in the transition prohibition instruction are the same, the transition prohibition instruction transmitted from the tag communication means includes the identification information of the activation instruction means Thus, it is not necessary to store the identification information received together with the activation instruction when the communication unit transitions from the second mode to the first mode.

  In the RFID system, the determination unit stores the identification information received together with the activation instruction when the communication unit transitions from the second mode to the first mode in the storage unit, and the tag communication unit stores the identification information in the RFID tag. On the other hand, when the communication unit receives the activation instruction in a state where the first mode is changed to the second mode, the identification information received together with the activation instruction is the same as the identification information stored in the storage unit. In this case, a notification indicating that the communication unit is not allowed to transition from the second mode to the first mode is transmitted as a transition prohibition instruction, and the determination unit is activated in a state where the communication unit has transitioned from the first mode to the second mode. When receiving the instruction, the tag communication means determines whether the identification information received together with the activation instruction and the identification information stored in the storage unit are the same. It is not necessary to know the identification information transmitted together with al activation instruction, it is possible to enhance the versatility.

It is a figure which shows 1st Embodiment of the RFID system of this invention. It is a figure for demonstrating operation | movement of the RFID tag in the mode which the active communication part shown in FIG. 1 has. It is a figure which shows an example of the articles | goods managed using the RFID tag shown in FIG. It is a figure which shows an example of the system environment which manages the cold storage box shown in FIG. FIG. 5 is a diagram for explaining a change in the state of the RFID tag when managing the cold box shown in FIG. 3 in the system environment shown in FIG. 4. It is a figure for demonstrating the reception operation | movement of the wakeup command in the silent 1 mode of the active communication part shown in FIG. It is a figure for demonstrating the transmission / reception operation | movement of the signal in the normal mode of the active communication part shown in FIG. It is a figure for demonstrating the transmission / reception operation | movement of the temperature log data in the normal mode of the active communication part shown in FIG. It is a flowchart for demonstrating the detailed process at the time of the cool box shown in FIG. 3 being carried in to a passage base. It is a figure which shows 2nd Embodiment of the RFID system of this invention. 11 is a flowchart for explaining detailed processing in the case where the RFID system shown in FIG. 10 is employed in the passage base shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram showing a first embodiment of an RFID system according to the present invention.

  As shown in FIG. 1, the RFID system according to this embodiment includes an RFID tag 10, a wakeup reader 71, and a tag detection reader 72.

  The RFID tag 10 includes a battery 11 serving as a power source, two antennas 12 and 13, an active communication unit 14, a passive communication unit 15, a control microcomputer 16, an interface unit 17, and a memory 18. Yes.

  As the battery 11, an appropriate battery such as an alkaline battery or a nickel battery can be used, and serves as a power source for the entire RFID tag 10.

  The antenna 12 resonates with a radio wave transmitted from the wakeup reader 71 or the tag detection reader 72 in a wireless RFID such as 2.45 GHz or UHF band (860 to 960 MHz), thereby wakeup reader 71 or tag detection reader. 72 for transmitting and receiving signals to and from 72.

  The antenna 13 has a coil shape and performs non-contact communication using a frequency band of 13.56 MHz. A current flows due to electromagnetic induction in the non-contact communication to generate an electromotive force. Is transmitted to the passive communication unit 15 and signals are transmitted to and received from a reader (not shown).

  The active communication unit 14 is a communication unit in the present invention. The active communication unit 14 is driven by the battery 11, modulates / demodulates the signal, and communicates with the wake-up reader 71 and the tag detection reader 72 by non-contact communication via the antenna 12 using a wireless RFID such as 2.45 GHz or UHF band. , And has three modes.

  The passive communication unit 15 is driven by a power source supplied from the antenna 13, modulates and demodulates the signal, and transmits a signal to and from a reader (not shown) through non-contact communication via the antenna 13 in the 13.56 MHz frequency band. Send and receive. That is, the passive communication unit 15 is driven by the electromotive force generated in the antenna 13 by non-contact communication.

  The control microcomputer 16 performs control according to signal transmission / reception in the active communication unit 14 and the passive communication unit 15, and includes a state transition unit 16a and a determination unit 16b.

  The state transition unit 16 a changes the mode of the active communication unit 14 by a command transmitted from the wakeup reader 71 or the tag detection reader 72.

  The determination unit 16b is included in the ID of the wakeup reader 71 itself as identification information transmitted together with the wakeup command serving as an activation instruction from the wakeup reader 71, and the transition prohibition instruction transmitted from the tag detection reader 72. It is determined whether or not the ID is the same.

  The interface unit 17 manages an interface with a connected external device.

  The memory 18 serves as a storage unit in the present invention, stores the tag ID of the RFID tag 10 and information acquired from an external device via the interface unit 17, and is transmitted from the tag detection reader 72. The ID included in the transition prohibition instruction is stored.

  The wakeup reader 71 serves as an activation instruction unit in the present invention, and includes an antenna 21, a communication unit 22, a control unit 23, and a memory 24.

  The communication unit 22 periodically transmits a wakeup command via the antenna 21. At that time, the communication unit 22 transmits the ID of the wakeup reader 71 itself together with the wakeup command via the antenna 21. Then, the communication unit 22 transmits the wakeup command and ID using a wireless RFID such as 2.45 GHz or UHF band, so that the wakeup command and ID transmitted from the wakeup reader 71 are transmitted to the antenna. 12 is received by the active communication unit 14 via the communication terminal 12.

  The control unit 23 controls the transmission interval of the wakeup command from the communication unit 22, reads the ID of the wakeup reader 71 from the memory 24, and transmits the ID together with the wakeup command via the communication unit 22 and the antenna 21. .

  The tag detection reader 72 serves as a tag communication means in the present invention, and includes an antenna 31, a communication unit 32, a control unit 33, and a memory 34.

  The communication unit 32 performs non-contact communication with the RFID tag 10 via the antenna 31. At that time, the communication unit 32 performs non-contact communication with the active communication unit 14 of the RFID tag 10 by performing non-contact communication with a wireless RFID such as 2.45 GHz or UHF band. Become. Even if the communication unit 32 transmits a transition command serving as a transition instruction for shifting the mode of the active communication unit 14 or the RFID tag 10 receives the wakeup command transmitted from the wakeup reader 71, the communication unit 32 The tag 10 transmits a command that is a transition prohibition instruction that instructs to ignore the wakeup command.

  The control unit 33 controls transmission of a command from the communication unit 32, and reads the tag ID of the RFID tag 10 that performs non-contact communication via the communication unit 32. Further, when transmitting a command that is a transition prohibition instruction from the communication unit 32, the control unit 33 reads the ID of the wakeup reader 71 from the memory 34 and transmits it from the communication unit 32 in the transition prohibition instruction.

  Here, three modes of the active communication unit 14 will be described.

  FIG. 2 is a diagram for explaining the operation of the RFID tag 10 in the mode of the active communication unit 14 shown in FIG.

  As shown in FIG. 2, the active communication unit 14 shown in FIG. 1 has a normal mode that is a first mode, a silent 1 mode that is a second mode, and a silent 2 mode.

  In the normal mode, the active communication unit 14 periodically transmits an event signal that triggers non-contact communication via the antenna 12. Although the command signal from the wakeup reader 71 and the tag detection reader 72 is not intermittently received, a response signal to the event signal is received via the antenna 12 immediately after the event signal is transmitted. When the response signal is a command signal that requests transmission of information, information corresponding to the received command signal is transmitted.

  In the silent 1 mode, the active communication unit 14 does not transmit an event signal and intermittently receives a wakeup command as a command signal transmitted from the wakeup reader 71 via the antenna 12.

  In the silent 2 mode, the active communication unit 14 does not transmit an event signal or intermittently receive a command signal.

  In addition, when the active communication unit 14 is in any of the above three modes, the passive communication unit 15 is driven by the electromotive force generated in the antenna 13 by non-contact communication, and thus can be always accessed via the antenna 13. The command signal can be received via the antenna 13.

  The article management using the RFID tag 10 described above will be described below.

  FIG. 3 is a diagram showing an example of an article managed using the RFID tag 10 shown in FIG.

  As shown in FIG. 3, the RFID tag 10 shown in FIG. 1 can be used for managing the cold box 5. In this case, the RFID tag 10 is attached to the outer surface of the cold box 5 with the temperature sensor 2, the open / close sensor 3, and the display device 4 being connected via the interface unit 17, for example.

  The temperature sensor 2 is installed inside the cold box 5 and detects the temperature inside the cold box 5. In addition, when the inside of the cold box 5 is partitioned into a plurality of regions and the plurality of regions are set to different temperatures, the temperature sensor 2 is installed for each of the plurality of regions.

  The open / close sensor 3 includes, for example, an optical sensor, and is installed inside the cold box 5 to detect an operation of opening the cold box 5 by detecting light.

  The display device 4 is made of, for example, an LCD or electronic paper, and displays the temperature detected by the temperature sensor 2.

  In addition to the temperature sensor 2, the open / close sensor 3, and the display device 4, the RFID tag 10 can be connected to any device such as an outside air temperature sensor or an impact sensor that detects the outside air temperature. The detected information can be acquired by the RFID tag 10 via the interface unit 17.

  FIG. 4 is a diagram showing an example of a system environment for managing the cold box 5 shown in FIG.

  In the following, as shown in FIG. 4, after the cold box 5 shown in FIG. 3 is transported from the shipping base 60 to the passing base 70 and it is managed that the cold box 5 has passed through the passing base 70, the incoming base 80 A management method in the case where temperature log data of the cold box 5 is collected at the warehousing site 80 and then the cold box 5 is returned to the shipping site 60 again will be described.

  At the delivery base 60 from which the cold box 5 is delivered, a reader 61 that reads information by transmitting and receiving signals to and from the RFID tag 10 by non-contact communication, and a communication device 62 that can be connected to the data center 90 are provided. Is arranged.

  A wake-up reader 71 and a tag detection reader 72 shown in FIG. 1 and a communication device 73 that can be connected to the data center 90 are arranged at the passage base 70 through which the cool box 5 passes.

  In the storage base 80 where the cold box 5 is stored, the wakeup reader 81 and the tag detection reader 82 having the same functions as the wakeup reader 71 and the tag detection reader 72 arranged in the passage base 70, and the data center 90 are provided. A connectable communication device 83 is arranged.

  The data center 90 is a base for managing the transportation status of the cold box 5. The data center 90 is provided with a communication device 91 that can be connected to the communication devices 62, 73, and 83, and a database 92 that stores the transportation status of the cold box 5. have.

  FIG. 5 is a diagram for explaining a change in the state of the RFID tag 10 when managing the cold box 5 shown in FIG. 3 in the system environment shown in FIG.

  The cold box 5 shown in FIG. 3 is delivered from the delivery base 60. Note that the active communication unit 14 of the RFID tag 10 is in the silent 2 mode as an initial state (step 1). In the silent 2 mode, the active communication unit 14 does not transmit or receive signals, so that almost no power is consumed. Further, the temperature sensor 2 sequentially detects the temperature inside the cold box 5, and this temperature data is transmitted to the RFID tag 10. In the RFID tag 10, the temperature data transmitted from the temperature sensor 2 is received via the interface unit 17 and is stored in the memory 18 as temperature log data under the control of the control microcomputer 16. Further, the temperature detected by the temperature sensor 2 is displayed on the display device 4.

  When a transition command serving as a transition instruction for transitioning to the silent 1 mode is transmitted from the reader 61 provided at the shipping base 60 to the RFID tag 10 in which the active communication unit 14 is in the silent 2 mode, When the transition command is received by the antenna 13, electromagnetic induction occurs. Due to this electromagnetic induction, a current flows through the antenna 13 and an electromotive force is generated in the antenna 13. The power generated by the electromotive force generated in the antenna 13 is supplied to the passive communication unit 15, the passive communication unit 15 is driven, and the transition command transmitted from the reader 61 is received by the passive communication unit 15 (step 2). As described above, in the silent 2 mode, although the active communication unit 14 does not transmit and receive signals, the passive communication unit 15 is generated in the antenna 13 by electromagnetic induction when the transition command is received by the antenna 13. Since it is driven by electromotive force, the transition command transmitted from the reader 61 can be received.

  Then, under the control of the state transition unit 16a of the control microcomputer 16, the active communication unit 14 transitions to the silent 1 mode according to the transition command received by the passive communication unit 15 (step 3).

  Thereafter, when the cold box 5 is discharged from the shipping base 60, code information such as a two-dimensional code displayed on a work slip (not shown) attached to the cold box 5 is read and transmitted from the communication device 62, When the code information is received by the communication device 91 of the data center 90, the cool box 5 identified by the received code information is delivered from the delivery base 60 at the transmission time of the code information. Are registered in the database 92 and managed. When the cold box 5 is discharged from the shipping base 60, the tag 61 stored in the memory 18 of the RFID tag 10 attached to the cold box 5 is read by the reader 61 of the shipping base 60, and this tag ID. Is transmitted to the communication device 91 of the data center 90, so that in the data center 90, the cold box 5 to which the RFID tag 10 identified by the tag ID transmitted from the reader 61 is attached is the transmission time of the tag ID. It is also conceivable that the delivery from the delivery base 60 is registered in the database 92 and managed. In that case, the RFID tag 10 transitions from the silent 1 mode to the normal mode in the same manner as the passage base 70 and the warehousing base 80 described later, and the tag ID is read out by transmitting an event signal in the normal mode.

  In the state where the cold box 5 is delivered from the delivery base 60, the active communication unit 14 is in the silent 1 mode so that the command signal is intermittently received, but the event signal is transmitted. Therefore, no radio wave is transmitted via the antenna 12. Therefore, there is no problem even when the cold box 5 delivered from the delivery base 60 passes through an area where transmission of radio waves is prohibited, for example, when the box is transported by air.

  The cold box 5 delivered from the delivery base 60 passes through the passage base 70 before being transported to the storage base 80, and the fact is managed by the data center 90.

  In a state where the cold box 5 discharged from the discharge base 60 is transported to the passage base 70, the active communication unit 14 of the RFID tag 10 attached to the cold box 5 is in the silent 1 mode (step 4). .

  When a wake-up command as an activation instruction is transmitted from the wake-up reader 71 provided at the passage base 70 to the RFID tag 10 in which the active communication unit 14 is in the silent 1 mode, the wake-up command is transmitted to the antenna. 12 is received by the active communication unit 14 via step 12 (step 5).

  FIG. 6 is a diagram for explaining the reception operation of the wake-up command in the silent 1 mode of the active communication unit 14 shown in FIG.

  In the silent 1 mode, as shown in FIG. 6, the active communication unit 14 performs intermittent reception of a command signal, and the wake-up command 101 transmitted from the wake-up reader 71 is received during the reception state. Will be received.

  The wakeup command 101 is a command signal for switching the active communication unit 14 to the normal mode, and is transmitted from the wakeup reader 71 together with an ID serving as identification information that can identify the wakeup reader 71.

  When the active communication unit 14 receives the wakeup command, if the ID transmitted together with the wakeup command is not the same as the ID stored in the memory 18 (step 6), the control microcomputer 16 Under the control of the state transition unit 16a, the active communication unit 14 transitions to the normal mode (step 7).

  Detailed processing at this time will be described later.

  When the active communication unit 14 transitions to the normal mode, the tag ID stored in the memory 18 is read by the control microcomputer 16 and transmitted to the tag detection reader 72 via the active communication unit 14. The tag ID transmitted to the tag detection reader 72 is transmitted to the data center 90 via the communication device 73, and the tag ID is received by the communication device 91 of the data center 90. It is registered and managed in the database 92 that the cold box 5 to which the RFID tag 10 identified by the tag ID is attached has passed the passage base 70 at the transmission time of the tag ID.

  Thereafter, when a transition command for transitioning to the silent 1 mode is transmitted from the tag detection reader 72 to the RFID tag 10 in which the active communication unit 14 is in the normal mode, the transition command is transmitted via the antenna 12. Is received by the active communication unit 14 (step 8).

  FIG. 7 is a diagram for explaining a signal transmission / reception operation in the normal mode of the active communication unit 14 shown in FIG.

  In the normal mode, as shown in FIG. 7, the active communication unit 14 periodically transmits an event signal 102 that triggers non-contact communication via the antenna 12, and intermittently receives command signals from the reader. Is not performed, but is in a reception state in a certain interval immediately after the transmission of the event signal 102, and in this reception state, a response signal 103 to the event signal 102 is received via the antenna 12. Therefore, a command signal for performing non-contact communication and a transition command for shifting to the silent 1 mode can be received as the response signal 103. The tag ID read from the memory 18 by the control microcomputer 16 is included in the event signal 102 and transmitted to the tag detection reader 72.

  Then, under the control of the state transition unit 16a of the control microcomputer 16, the active communication unit 14 transitions to the silent 1 mode according to the transition command received by the active communication unit 14 (step 9).

  After the active communication unit 14 transitions to the silent 1 mode, the cold box 5 is delivered from the passage base 70. At this time, in the state where the cold box 5 is delivered from the passage base 70, the active communication unit 14 is in the silent 1 mode, so that the command signal is intermittently received, but the event signal is transmitted. Since it is not performed, the radio wave is not transmitted through the antenna 12. Therefore, there is no problem even when the cold box 5 delivered from the passage base 70 passes through an area where transmission of radio waves is prohibited, for example, when the box is transported by air.

  The cold box 5 delivered from the passage base 70 is then carried into the warehouse base 80. In this state, the active communication unit 14 of the RFID tag 10 attached to the cold box 5 is in the silent 1 mode (step 10).

  When the wake-up command is transmitted from the wake-up reader 81 provided at the storage base 80 to the RFID tag 10 in which the active communication unit 14 is in the silent 1 mode, the wake-up command is transmitted via the antenna 12. Received by the active communication unit 14 (step 11).

  When the active communication unit 14 receives the wakeup command, the active communication unit 4 transitions to the normal mode under the control of the state transition unit 16a of the control microcomputer 16 (step 12).

  A command signal for requesting temperature log data stored in the memory 18 is sent from the tag detection reader 82 provided at the storage base 80 to the RFID tag 10 in which the active communication unit 14 is in the normal mode. The command signal is transmitted to the active communication unit 14 via the antenna 12.

  FIG. 8 is a diagram for explaining a temperature log data transmission / reception operation in the normal mode of the active communication unit 14 shown in FIG.

  As described above, in the normal mode, the active communication unit 14 periodically transmits an event signal and does not receive a command signal intermittently from the reader. However, the active communication unit 14 receives the signal during a certain period immediately after the event signal is transmitted. It is in a state. Therefore, as shown in FIG. 8, in this reception state, the sensor log request command 104 for requesting the temperature log data stored in the memory 18 can be received via the antenna 12 for the event signal.

  When the sensor log request command 104 is received by the RFID tag 10, a command response signal 105 is transmitted from the active communication unit 14 to the tag detection reader 82, and then the signal is transmitted by the active communication unit 14 under the control of the control microcomputer 16. A channel used for transmission / reception is switched to a channel for transmitting temperature log data, and a channel used for signal transmission / reception in the tag detection reader 82 is also switched to a channel for receiving temperature log data.

  Then, the control microcomputer 16 reads a log of temperature data stored in the memory 18 and transmits it to the tag detection reader 82 via the active communication unit 14 (step 13).

  When the transmission of the log of the temperature data stored in the memory 18 is completed, a command response signal 105 is transmitted from the active communication unit 14 to the tag detection reader 82, and the active communication unit 14 transmits and receives signals under the control of the control microcomputer 16. The channel used for transmitting the event signal is switched to the channel for transmitting the event signal, and the tag detecting reader 82 is also switched to the channel for receiving the event signal.

  Further, since the event ID transmitted from the RFID tag 10 in the normal mode includes the tag ID read from the memory 18 by the control microcomputer 16, the event signal is transmitted from the RFID tag 10 in the data center 90. The cold box 5 to which the RFID tag 10 identified by the tag ID included in the event signal is attached has been stored in the storage base 80 at the transmission time of the tag ID, and the temperature inside the cold box 5 The history is registered in the database 92 and managed.

  Thereafter, when a transition command for transitioning to the silent 2 mode is transmitted from the tag detection reader 82 to the RFID tag 10 in which the active communication unit 14 is in the normal mode, the transition command is transmitted via the antenna 12. Is received by the active communication unit 14 (step 14).

  Then, under the control of the state transition unit 16a of the control microcomputer 16, the active communication unit 14 transitions to the silent 2 mode in accordance with the command signal received by the active communication unit 14 (step 15).

  The cold box 5 unpacked in this manner is returned to the delivery base 60 in a state where the active communication unit 14 is in the silent 2 mode. In the process in which the cold box 5 is returned from the entry base 80 to the exit base 60, non-contact communication is not performed with respect to the RFID tag 10, so that the active communication unit 14 can be set to the silent 2 mode. As a result, almost no power is consumed.

  Below, the process in the passage base 70 mentioned above is demonstrated in detail.

  FIG. 9 is a flowchart for explaining detailed processing when the cold box 5 shown in FIG. 3 is carried into the passage base 70.

  In the wakeup reader 71 provided at the passage base 70 into which the cold box 5 is carried, as described above, the wakeup command is periodically transmitted from the communication unit 22 via the antenna 21 together with the ID of the wakeup reader 71 itself. Has been transmitted (step 21).

  When the cold box 5 is carried into the passage base 70, the active communication unit 14 of the RFID tag 10 attached to the cold box 5 is in the silent mode 1, so the cold box 5 is carried into the passage base 70. Then, the active communication unit 14 of the RFID tag 10 attached to the cold box 5 receives the wakeup command and the ID of the wakeup reader 71 (step 22).

  Then, first, ID verification is performed in the control microcomputer 16 of the RFID tag 10 (step 23). The determination unit 16b of the control microcomputer 16 determines whether or not the ID included in the transition prohibition instruction that instructs to ignore the wakeup command is stored in the memory 18 (step 24). If it is determined that the ID stored in the memory 18 is the same as the ID received together with the wake-up command in step 22, the determination unit 16b determines whether the ID is the same (step S22). 25). As described later, the ID stored in the memory 18 includes the ID included in the transition prohibition instruction transmitted from the tag detection reader 72 after the non-contact communication between the RFID tag 10 and the tag detection reader 72 is completed. Since this is performed when received by the RFID tag 10, the ID is not stored in the memory 18 when the RFID tag 10 has not yet received the transition prohibition instruction.

  If it is determined that the ID stored in the memory 18 and the ID received together with the wakeup command in step 22 are not the same, the active communication unit is controlled by the state transition unit 16a according to the wakeup command. 14 transitions to the normal mode (step 26).

  When the active communication unit 14 transitions to the normal mode, an event signal is periodically transmitted from the active communication unit 14 via the antenna 12 (step 27). At this time, as described above, the tag ID is read from the memory 18 under the control of the control microcomputer 16 and is transmitted by being included in the event signal.

  When the event signal transmitted from the RFID tag 10 is received by the tag detection reader 72 (step 28), a response signal to the event signal is transmitted from the communication unit 32 and the antenna 31 by the control of the control unit 33 of the tag detection reader 72. (Step 29).

  Then, when this response signal is received by the active communication unit 14 of the RFID tag 10 (step 30), non-contact communication is started between the RFID tag 10 and the tag detection reader 72 (step 31, 32).

  Thereafter, when the non-contact communication between the RFID tag 10 and the tag detection reader 72 is completed, the tag detection reader 72 issues a transition command serving as a transition instruction for shifting the RFID tag 10 to the silent 1 mode. Even when the RFID tag 10 receives the wake-up command transmitted from the wake-up reader 71 again, a command serving as a transition prohibition instruction that instructs the RFID tag 10 to ignore the wake-up command is transmitted. Transmitted from the unit 32 (step 33). At this time, as described above, in the tag detection reader 72, the ID of the wakeup reader 71 is stored in the memory 34, and this ID is included in the transition prohibition instruction and transmitted from the communication unit 32. .

  When the transition prohibition instruction transmitted from the tag detection reader 72 is received by the RFID tag 10 (step 34), the ID included in the transition prohibition instruction is stored in the memory 18 under the control of the control microcomputer 16 of the RFID tag 10. (Step 35). If the ID is already stored in the memory 18, the ID of the wakeup reader 71 provided in the passing base 70 where the RFID tag 10 currently stays is stored in the memory 18 by overwriting the ID. Will be.

  When the RFID tag 10 receives the transition command transmitted from the tag detection reader 72, the active communication unit 14 transitions to the silent 1 mode under the control of the state transition unit 16a of the control microcomputer 16 (step 36). ).

  After that, when the cold box 5 stays at the passage base 70, when the wakeup command transmitted from the wakeup reader 71 is received again by the RFID tag 10, it is transmitted from the wakeup reader 71 together with the wakeup command. Since the ID of the wakeup reader 71 is stored in the memory 18, the determination unit 16b determines that the ID stored in the memory 18 and the ID received together with the wakeup command are the same. Become. That is, the ID received by the RFID tag 10 together with the wake-up command is the same as the ID received by the RFID tag 10 together with the wake-up command when the RFID tag 10 transitions from the silent 1 mode to the normal mode. become.

  In this case, even if the RFID tag 10 receives the wakeup command transmitted from the wakeup reader 71 again, the RFID tag 10 does not transition to the normal mode and remains in the silent 1 mode under the control of the state transition unit 16a. It becomes.

  Even when the active communication unit 14 transitions to the normal mode, when there is no data to be transmitted from the RFID tag 10 to the tag detection reader 72 such as a log of temperature data stored in the memory 18 at the passage base 70, When the tag detection reader 72 receives an event signal, the tag detection reader 72 transmits a transition command serving as a transition instruction and a command serving as a transition prohibition instruction.

  As described above, in the present embodiment, the RFID tag 10 receives the wakeup command transmitted from the wakeup reader 71 in the silent 1 mode in which the active communication unit 14 of the RFID tag 10 only receives the command signal. As a result, the active communication unit 14 transitions to the normal mode in which the event signal is transmitted and the response signal is received, and the non-contact communication between the RFID tag 10 and the tag detection reader 72 is completed in the normal mode. Thereafter, when the RFID tag 10 receives the transition command transmitted from the tag detection reader 72 and the active communication unit 14 transitions to the silent 1 mode, the RFID tag 10 receives the wake-up command. Wake received with this wakeup command The ID of the kuup reader 71 and the ID included in the transition prohibition instruction received from the tag detection reader 72 and received together with the wakeup command when the active communication unit 14 transitions from the silent 1 mode to the normal mode are the same. It is judged whether or not. If it is determined that the two IDs are the same, the active communication unit 14 does not transition from the silent 1 mode to the normal mode, so that the active communication unit 14 receives the wake-up command when the RFID tag 10 receives the wake-up command. When the RFID tag 10 receives a wake-up command transmitted from the same wake-up reader 71 in the state of transitioning from the silent 1 to the normal mode and then transitioning to the silent 1 mode again, the active communication unit 14 is in the normal state. Transition to the mode again is avoided. Thereby, in the passage base 70 of the cold box 5, reading of the tag ID is completed for the RFID tag 10 attached to the cold box 5, and the active communication unit 14 transitions again from the normal mode to the silent 1 mode. Even when the RFID tag 10 receives the wake-up command transmitted from the wake-up reader 71 again, the active communication unit 14 does not change again from the silent 1 mode to the normal mode, and active communication is performed. It is avoided that the unit 14 leaves the passage base 70 in the normal mode in which the event signal is transmitted and the response signal is received. In addition, when the RFID tag 10 receives the wakeup command again, a transition command for causing the RFID tag 10 to transition from the normal mode to the silent 1 mode so that the active communication unit 14 does not transition from the silent 1 mode to the normal mode. In addition, the ID of the wakeup reader 71 is included in the transition prohibition instruction transmitted from the tag detection reader 72 and transmitted, so that the RFID tag 10 transitions from the silent 1 mode to the normal mode by receiving the wakeup command. In this case, it is not necessary to store the ID received together with the wakeup command.

(Second Embodiment)
FIG. 10 is a diagram showing a second embodiment of the RFID system of the present invention.

  As shown in FIG. 10, the RFID system in this embodiment is provided with a memory for storing the ID of the wake-up reader 171 in the tag detection reader 172 as compared with the one shown in the first embodiment. In addition, the determination unit 116b stores the wakeup reader 171 in the ID memory 118 of the wakeup reader 171 transmitted together with the wakeup command, and wakes up the transition prohibition instruction transmitted from the tag detection reader 172. The difference is that the ID of the reader 171 is not included.

  The RFID system configured as described above can be applied to the management of the cold box 5 shown in FIG. 3 in the system environment shown in FIG. 4 as in the case of the first embodiment. it can. In this case, the change in the state of the RFID tag 110 is the same as that shown in FIG. 5 in the first embodiment, and a description thereof is omitted here.

  In the following, processing when the RFID system shown in FIG. 10 is employed in the passage base 70 shown in FIG. 4 will be described. That is, processing when the wakeup reader 171 and the tag detection reader 172 shown in FIG. 10 are employed as the wakeup reader 71 and the tag detection reader 72 shown in FIG. 4 will be described.

  FIG. 11 is a flowchart for explaining detailed processing when the RFID system shown in FIG. 10 is employed in the passage base 70 shown in FIG.

  Even in the configuration in which the wake-up reader 171 shown in FIG. 10 is provided at the passage base 70 into which the cold box 5 is carried, the wake-up command is transmitted along with the ID of the wake-up reader 171 itself in the wake-up reader 171. Are periodically transmitted via the antenna 121 (step 121).

  When the cold box 5 is carried into the passage base 70, the active communication unit 114 of the RFID tag 110 attached to the cold box 5 is in the silent mode 1, so the cold box 5 is carried into the passage base 70. Then, the active communication unit 114 of the RFID tag 110 attached to the cold box 5 receives the wakeup command and the ID of the wakeup reader 171 (step 122).

  Then, first, ID verification is performed in the control microcomputer 116 of the RFID tag 110 (step 123). When the determination unit 116b of the control microcomputer 116 determines whether or not the ID of the wakeup reader is stored in the memory 118 (step 124), and it is determined that the ID of the wakeup reader is stored in the memory 118 The determination unit 116b determines whether the ID stored in the memory 118 and the ID received together with the wake-up command in step 122 are the same (step 125).

  When it is determined that the ID of the wakeup reader is not stored in the memory 118, or when the ID stored in the memory 118 is not the same as the ID received together with the wakeup command in step 122. If the ID is received, the ID received together with the wake-up command in step 122 is stored in the memory 118 under the control of the determination unit 116b (step 126). The unit 114 transitions to the normal mode (step 127).

  When the active communication unit 114 transitions to the normal mode, an event signal is periodically transmitted from the active communication unit 114 via the antenna 112 (step 128). At this time, as described above, the tag ID is read from the memory 118 under the control of the control microcomputer 116, and is transmitted by being included in the event signal.

  When the event signal transmitted from the RFID tag 110 is received by the tag detection reader 172 (step 129), a response signal to the event signal is transmitted to the communication unit 132 and the antenna 131 by the control of the control unit 133 of the tag detection reader 172. (Step 130).

  Then, when this response signal is received by the active communication unit 114 of the RFID tag 110 (step 131), non-contact communication is started between the RFID tag 110 and the tag detection reader 172 (step 132, 133).

  Thereafter, when the non-contact communication between the RFID tag 110 and the tag detection reader 172 is completed, the tag detection reader 172 receives a transition command as a transition instruction for shifting the RFID tag 110 to the silent 1 mode. Even when the RFID tag 110 receives the wakeup command transmitted from the wakeup reader 171 again, the ID received together with the wakeup command is the same as the ID stored in the memory 118. A command that is a transition prohibition instruction that instructs the RFID tag 110 to ignore the wake-up command is transmitted from the communication unit 132 (step 134).

  When the transition prohibition instruction and the transition command transmitted from the tag detection reader 172 are received by the RFID tag 110 (step 135), the active communication unit 114 is set to the silent 1 mode under the control of the state transition unit 116a of the control microcomputer 116. (Step 136).

  After that, when the cool box 5 stays at the passage base 70, when the RFID tag 110 receives the wakeup command transmitted from the wakeup reader 171 again, it is transmitted from the wakeup reader 171 together with the wakeup command. Since the ID of the wakeup reader 171 is stored in the memory 118, the determination unit 116b determines that the ID stored in the memory 118 and the ID received together with the wakeup command are the same. Become. That is, the ID received by the RFID tag 110 together with the wakeup command is the same as the ID received by the RFID tag 110 together with the wakeup command when the RFID tag 110 transitions from the silent 1 mode to the normal mode. become.

  In this case, even if the RFID tag 110 receives the wakeup command transmitted from the wakeup reader 171 again, the RFID tag 110 does not transition to the normal mode and remains in the silent 1 mode under the control of the state transition unit 116a. It becomes.

  Even when the active communication unit 114 transitions to the normal mode, when there is no data to be transmitted from the RFID tag 110 to the tag detection reader 172, such as a log of temperature data stored in the memory 118, at the passage base 70, The processing of steps 130 to 133 is not performed, and when the tag detection reader 72 receives an event signal, a transition command serving as a transition instruction and a command serving as a transition prohibition instruction are transmitted.

  As described above, in this embodiment, the RFID tag 110 receives the wakeup command transmitted from the wakeup reader 171 in the silent 1 mode in which the active communication unit 114 of the RFID tag 110 only receives the command signal. The active communication unit 114 transitions to the normal mode in which the event signal is transmitted and the response signal is received, and the ID of the wakeup reader 171 transmitted from the wakeup reader 171 together with the wakeup command is the RFID tag. 110 stored in the memory 118. Then, after the non-contact communication between the RFID tag 110 and the tag detection reader 172 is completed in the normal mode, the transition command transmitted from the tag detection reader 172 is received by the RFID tag 110, so that the active communication unit When the wakeup command is received by the RFID tag 110 in the state in which 114 is in the silent 1 mode, the ID of the wakeup reader 171 received together with the wakeup command and the active communication unit 114 is normal from the silent 1 mode. It is determined whether the ID received together with the wake-up command at the time of transition to the mode and stored in the memory 118 is the same. If it is determined that these two IDs are the same, the active communication unit 114 does not transition from the silent 1 mode to the normal mode. Therefore, when the RFID tag 110 receives the wake-up command, the active communication unit 114 When the RFID tag 110 receives the wake-up command transmitted from the same wake-up reader 171 in the state of transitioning from the silent 1 to the normal mode and then the transition to the silent 1 mode again, the active communication unit 114 is in the normal state. Transition to the mode again is avoided. Thereby, in the passage base 70 of the cool box 5, reading of the tag ID is completed for the RFID tag 110 attached to the cool box 5, and the active communication unit 114 transitions again from the normal mode to the silent 1 mode. Even when the RFID tag 110 receives the wakeup command transmitted from the wakeup reader 171 again, the active communication unit 114 does not transition from the silent 1 mode to the normal mode again, and active communication is performed. It is avoided that the unit 114 leaves the passage base 70 in the normal mode in which the event signal is transmitted and the response signal is received. Further, when the RFID tag 110 is changed from the silent 1 mode to the normal mode by the wakeup command, the ID of the wakeup reader received by the RFID tag 110 together with the wakeup command is stored in the memory 118, and then the RFID tag When a wakeup command is received by the tag 110, if the ID received together with the wakeup command and the ID stored in the memory 118 are the same, the wakeup command is received by the RFID tag 110. Even if it is a case, it is not necessary for the tag detection reader 172 to recognize the ID of the wakeup reader 171 by adopting a configuration in which the active communication unit 114 is not shifted from the silent 1 mode to the normal mode. To raise Kill.

  In the above-described two embodiments, an example in which the wakeup reader and the tag detection reader according to the present invention are employed in the wakeup readers 71 and 171 and the tag detection readers 72 and 172 provided at the passage base 70 is an example. As described above, when the RFID tag 10 or 110 transitions from the normal mode to the silent 1 mode after the sensor log is collected at the warehousing site 80, the wakeup reader 81 provided at the warehousing site 80 is used. In addition, the tag detection reader 82 may be adopted.

  In the two embodiments described above, when the active communication units 14 and 114 receive a transition command for transition from the normal mode to the silent 1 mode in the normal mode state, the predetermined condition is satisfied. The active communication units 14 and 114 have transitioned to the silent 1 mode, but a predetermined time has elapsed since the active communication units 14 and 114 transitioned to the normal mode, or a predetermined operation has been performed on the cool box 5. It is also conceivable that a predetermined condition is satisfied by breaking.

2 Temperature sensor 3 Open / close sensor 4 Display device 5 Cooling box 10, 110 RFID tag 11, 111 Battery 12, 13, 21, 31, 112, 113, 121, 131 Antenna 14, 114 Active communication unit 15, 115 Passive communication unit 16 , 116 Control microcomputer 16a, 116a State transition unit 16b, 116b Judgment unit 17, 117 Interface unit 18, 24, 34, 118, 124 Memory 22, 32 Communication unit 23, 33 Control unit 60 Delivery base 61 Leader 62, 73, 83, 91 Communication device 70 Passing site 71, 81 Wake-up reader 72, 82 Tag detection reader 80 Storage site 90 Data center 92 Database 101 Wake-up command 102 Event signal 103 Response signal 104 Sensor log request command 105 Command response signal

Claims (4)

A communication unit comprising a first mode for transmitting and receiving signals and a second mode for only receiving signals;
When the communication unit receives an activation instruction in the state of the second mode, the communication unit is shifted to the first mode, and the communication unit is in a state of the first mode and a predetermined condition is satisfied. A state transition unit that transitions the communication unit to the second mode when satisfied;
When the communication unit that has transitioned from the second mode to the first mode receives the activation instruction in a state in which the communication unit has transitioned again to the second mode, the identification information received together with the activation instruction, and the communication unit A determination unit for determining whether or not the identification information received together with the activation instruction when the transition from the second mode to the first mode is the same,
When the determination unit determines that the two identification information is not the same, the state transition unit changes the communication unit from the second mode to the first mode, and the determination unit An RFID tag that does not transition the communication unit from the second mode to the first mode when it is determined that the two pieces of identification information are the same. An RFID system using the RFID tag according to claim 1,
Activation instruction means for transmitting the activation instruction together with identification information capable of identifying itself;
When the communication unit then transmits a transition instruction for causing the communication unit to transition to the second mode to the RFID tag that has transitioned to the first mode, the communication unit performs the second operation. The identification information received together with the activation instruction when transitioning from the first mode to the first mode is received together with the activation instruction in a state where the communication unit has transitioned from the first mode to the second mode. A tag communication means for transmitting a transition prohibition instruction instructing not to cause the communication unit to transition from the second mode to the first mode,
When the communication unit receives the transition instruction and the transition prohibition instruction in the state of the first mode, the state transition unit determines that the predetermined condition is satisfied by reception of the transition instruction. Even when the unit is transitioned to the second mode and then the activation instruction is received, according to the transition prohibition instruction, the determination unit receives the identification information received together with the activation instruction, and the communication unit When it is determined that the identification information received when transitioning from the second mode to the first mode is the same, the communication unit is not transitioned from the second mode to the first mode. RFID system. The RFID system according to claim 2, wherein
The tag communication means transmits the identification information of the activation instruction means included in the transition prohibition instruction,
When the communication unit receives the activation instruction in a state where the communication unit has transitioned from the first mode to the second mode, the determination unit is included in the identification information received together with the activation instruction and the transition prohibition instruction An RFID system that determines whether the identification information is the same. The RFID system according to claim 2, wherein
The determination unit stores, in a storage unit, identification information received together with the activation instruction when the communication unit transitions from the second mode to the first mode,
When the tag communication unit receives the activation instruction in a state where the communication unit has transitioned from the first mode to the second mode with respect to the RFID tag, the identification information received together with the activation instruction Is transmitted as the transition prohibition instruction not to transition the communication unit from the second mode to the first mode when the same as the identification information stored in the storage unit,
When the communication unit receives the activation instruction in a state where the communication unit has transitioned from the first mode to the second mode, the determination unit stores the identification information received together with the activation instruction and the storage unit An RFID system that determines whether the identification information is the same.

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