JP2015176537A - Wireless tag communication device, wireless tag communication system, and wireless tag communication program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless tag communication device that reduces difference between positional information on a list and a position where an article actually is, and thereby shortens search time to search for a wireless tag.SOLUTION: A wireless tag communication device comprises: a wireless tag communication unit that communicates with wireless tags which are attached to a plurality of articles and have stored identification information, and communicates by a first reading function to perform reading operation without specifying a wireless tag; a storage unit for storing information on a list associating identification information on a wireless tag with positional information on a place where an article is; a positional information setting unit for inputting positional information indicating a position to read the wireless tag; a comparison unit for comparing the positional information on the list corresponding to the identification information on the wireless tag read by the first reading function with the positional information input by the positional information setting unit; and a list information setting unit for changing the positional information on the list to the input positional information when the respective pieces of information compared by the comparison unit are different.

Description

 Embodiments described herein relate generally to a wireless tag communication device, a wireless tag communication system, and a wireless tag communication program that are designed to improve the efficiency of the work of searching for an object.

  Conventionally, a system in which a wireless tag is attached to an article such as a product or equipment in a store, a warehouse, an office, etc., and information in a storage unit of the wireless tag is read contactlessly using a wireless tag communication device to detect the presence of the article There is. Since information on a plurality of wireless tags can be acquired in a short time, it has been attracting attention in terms of improving the efficiency of various operations. As the communication range of the wireless tag communication device is wider, more wireless tag information can be acquired. it can.

  For example, there is a case where a wireless tag storing identification information is attached to equipment stored in a plurality of areas, and a target equipment is searched using a wireless tag communication device. Multiple areas may be separate buildings or partitioned by the same building. In addition, by storing list information in which a device name, identification information of a wireless tag affixed to the device, and area information in which the device exists are stored in a server that is a host device, the operator can select a list. You can set the target equipment from the information and search for the target equipment. After exploring and taking out the equipment, it is returned to the original area.

  As a typical wireless tag, for example, there is a wireless tag of ISO / IEC18000-6typeC standard. Patent Document 1 discloses a wireless tag communication device that detects a wireless tag having specific ID information from a plurality of wireless tags and performs an article recognition operation.

  By the way, in the conventional RFID tag communication apparatus, the position information on the list may be different from the actual position of the equipment. The reason for the difference is that if the operator accidentally returns the equipment to a different area after taking out the equipment, or if there is no free space in the area that the operator tried to return, the equipment is unavoidably returned to another area. If you do not change the position information of the list as it is, or if there is no free space when storing new equipment, if you move a piece of equipment to another area and do not change the position information of the list, And so on.

  However, if there is a difference between the position information on the list and the actual position of the equipment, when searching for equipment, the operator thinks that there is a target equipment in the area of the position information on the list. However, if you search, you will not be able to find it. Therefore, there is a problem that the search is performed in a different area, and the search takes time.

Japanese Unexamined Patent Publication No. 2011-237941

  The problem to be solved by the invention is to provide a wireless tag communication device that reduces the difference between the position information of the list and the position where the article actually exists, and shortens the search time of the wireless tag.

  The wireless tag communication device according to the embodiment is provided in a plurality of articles, communicates with a wireless tag storing identification information, and communicates with a first reading function that performs a reading operation without specifying the wireless tag. A communication unit, a storage unit that stores information on a list in which identification information of the wireless tag and positional information on which the article exists are stored, and a positional information setting unit that inputs positional information for reading the wireless tag A comparison unit that compares the position information on the list corresponding to the identification information of the wireless tag read by the first reading function with the position information input by the position information setting unit, and the comparison unit A list information setting unit that changes the position information on the list to the position information input from the position information setting unit when the compared pieces of position information are different.

Explanatory drawing of the article search using the wireless tag communication apparatus which concerns on one Embodiment. 1 is an external view of a wireless tag communication device according to an embodiment and a cross-sectional view of an antenna. Explanatory drawing which shows an example of the information of the list | wrist used by one Embodiment. 1 is a block diagram showing a configuration of a wireless tag communication device according to an embodiment. The block diagram which shows the specific structure of the wireless tag communication part and communication control part in one Embodiment. The flowchart which shows the process sequence of the control part in one Embodiment. The timing chart of the radio | wireless communication protocol of the 1st reading function in one Embodiment. The flowchart which shows the process sequence of the control part in 2nd Embodiment. 9 is a flowchart illustrating a processing procedure of a second reading function according to the second embodiment. The timing chart of the radio | wireless communication protocol of the 2nd reading function in 2nd Embodiment. The flowchart which shows the process sequence of the control part in 3rd Embodiment. The flowchart which shows the other process sequence of the control part in 3rd Embodiment. 10 is a data structure example of a second wireless tag and a wireless communication protocol timing chart according to the fourth embodiment. The block diagram which shows the structure of the wireless tag communication apparatus which concerns on 5th Embodiment.

  Embodiments for carrying out the invention will be described below with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected about the same location.

(First embodiment)
FIG. 1 is an explanatory diagram of an article search using the RFID tag communication apparatus according to the first embodiment. The search target article is a piece of equipment or a product, and a plurality of pieces of equipment (10, 10,...) Are stored in a target area (for example, areas 1 to 4). Areas 1 to 4 are, for example, separate areas in separate buildings or the same building.

 A wireless tag 11 is affixed to each device 10, and identification information (tag ID) for identifying the wireless tag and identification information for identifying each device are stored in the storage unit of the wireless tag 11. (Details will be described later). The wireless tag communication device 20 communicates with the wireless tag 11 wirelessly, and receives and reads identification information (tag ID) and the like stored in the storage unit of the wireless tag 11. Further, the wireless tag communication device 20 can communicate with the host device 100.

  FIG. 2A is an external view of the wireless tag communication device 20. The wireless tag communication device 20 includes an antenna 22 in a main body 21, and the main body 21 includes a notification unit 24 such as a display and an input unit 25 such as a keyboard. In FIG. 2A, the main body 21 and the antenna 22 are integrated, but the antenna 22 may be separated from the main body 21 and connected via a cable. The operator reads the wireless tag 11 with the surface of the antenna 22 facing in an arbitrary direction.

 As shown in FIG. 2B, the antenna 22 has a plate-like dielectric 221 fixed inside the antenna housing 23, and a radiator 222 is provided on the antenna surface 26 side of the dielectric 221. This is a planar patch antenna provided with a ground 223 on the back side. And it has directivity with the maximum gain in the substantially vertical direction from the center of the antenna surface 26.

 On the other hand, the server that is the host device 100 stores information of a list in which the product name of the equipment 10, identification information of the wireless tag 11, and position (area) information storing the wireless tag 11 are linked.

 FIG. 3 is an explanatory diagram illustrating an example of a list stored in the higher-level device 100. The list information (list information) includes product names (equipment 1 to equipment n), identification information of the wireless tag 11 attached to each piece of equipment, and position information indicating an area where each piece of equipment is stored.

  The position information is binary (0, 1) information of a plurality of digits. For example, area 1, area 2, area 3, and area 4 are sequentially displayed from the least significant digit (right end) to the most significant digit (left end). Show. Of the binary values of each digit, “0” indicates that there is no wireless tag 11 in the area, and “1” indicates that the wireless tag 11 is present in the area.

 For example, the position information “0001” of the equipment 1 indicates the possibility that the wireless tag 11 is in the area 1 and indicates that the wireless tag 11 is not in the area 2, the area 3, and the area 4. The position information “1110” of the equipment 15 indicates the possibility that the wireless tag 11 is not in the area 1 but in the area 2, the area 3, and the area 4. In other words, it indicates that there is a possibility of being outside of area 1. The wireless tag communication device 20 is configured to be able to communicate with a server that is the host device 100 via a wireless LAN, for example, and transmits / receives list information and the like.

 FIG. 4 is a block diagram illustrating a configuration of the wireless tag communication device 20. In addition to the notification unit 24 and the input unit 25, the wireless tag communication device 20 (hereinafter simply referred to as the communication device 20) includes a wireless tag communication unit 30, a power supply unit 31, a communication unit 32 that performs communication with the host device 100, and A control unit 33 is provided. The host device 100 is a server, for example.

  The notification unit 24 includes a display and a buzzer, and the input unit 25 includes a keyboard or the like. The input unit 25 may be a touch panel configured on the display of the notification unit 24. The wireless tag communication unit 30 includes an antenna 22 and communicates with the wireless tag 11 wirelessly to identify the wireless tag identification information 13 (tag ID) stored in the storage unit 12 of the wireless tag 11 and the devices 1 to n. The equipment identification information 14 to be received is received and read. Details of the wireless tag communication unit 30 will be described later. The wireless tag identification information 13 is referred to as tag ID 13 in the following description.

 The power supply unit 31 includes a battery and a control circuit that charges and discharges the battery. The communication unit 32 is connected to the upper device 100 via a communication line (for example, a wireless LAN) and can communicate with the upper device 100. The communication line may be wired or wireless. The host device 100 stores the list information shown in FIG.

 The control unit 33 constitutes a computer, has a CPU (Central Processing Unit) 34, and controls the input unit 25, the notification unit 24, the wireless tag communication unit 30, the power supply unit 31, and the communication unit 32 to communicate with the communication device. 20 is controlled. The control unit 33 includes a storage unit 35 including a ROM (Read Only Memory) and a RAM (Random Access Memory). The ROM 350 of the storage unit 35 stores programs and setting data used by the control unit 33 in advance. In the RAM, variable data is temporarily written by the action of the control unit 33.

 In addition, in the storage unit 35, the RFID tag reading information 351 including the tag ID received by the RFID tag communication unit 30, the list information 352 received from the host device 100, and a position input when reading is started in each area. Information 353 and the like are stored. The list information 352 can be input / updated by the list information setting unit 251 of the input unit 25. As the position information 353, the content selected by the position information setting unit 252 of the input unit 25 is set.

 The display 24 in FIG. 2A shows an example of a screen displayed when position information is input. For example, a message such as “Please input area information” is displayed on the display 24, and the operator operates the input unit 25 to position information (for example, area “1”) from among the plurality of areas 1 to 4. An example in which is input.

 In addition, the control unit 33 includes a communication control unit 36. The communication control unit 36 sets and controls transmission output, transmission data, and the like in the wireless tag communication unit 30, and controls reception of received data. The communication control unit 36 will be described later together with the wireless tag communication unit 30.

  The control unit 33 further includes a comparison unit 37, which compares the position information included in the list information 352 associated with the tag ID of the tag reading information 351 and the position information set by the position information setting unit 252. Compare 353. The operation of the comparison unit 37 will be described later.

 FIG. 5 is a block diagram illustrating specific configurations of the wireless tag communication unit 30 and the communication control unit 36. The wireless tag communication unit 30 includes a transmission unit 41 that transmits data to the wireless tag 11, a reception unit 42 that receives data from the wireless tag 11, a directional coupler 43 such as a circulator, a low-pass filter 44, and an antenna 22. The transmitter 41, the receiver 42 and the low pass filter 44 are connected to the directional coupler 43, and the directional coupler 43 is connected to the antenna 22 via the low-pass filter 44.

  The transmission unit 41 includes an encoding unit 45, a PLL (Phase Locked Loop) unit 46, an amplitude modulation unit 47, a bandpass filter 48, and a power amplifier 49. The encoding unit 45 encodes the transmission signal output from the transmission control unit 72 of the communication control unit 36. The PLL unit 46 supplies a local carrier signal to the amplitude modulation unit 47. The amplitude modulation unit 47 performs amplitude modulation on the local carrier signal from the PLL unit 46 with the transmission signal encoded by the encoding unit 45.

 The bandpass filter 48 removes unnecessary components from the transmission signal amplitude-modulated by the amplitude modulation unit 47. The power amplifier 49 amplifies the transmission signal at an amplification factor according to the transmission output setting signal from the transmission output setting unit 71 of the communication control unit 36. The transmission output is varied by amplifying the transmission signal, and the transmission signal amplified by the power amplifier 49 is supplied to the directional coupler 43.

 The directional coupler 43 supplies the transmission signal from the transmission unit 41 to the antenna 22 via the low pass filter 44. The transmission signal supplied to the antenna 22 is radiated as a radio wave from the antenna 22. Upon receiving the radio wave radiated from the antenna 22, the wireless tag 11 is activated. The activated wireless tag 11 wirelessly transmits information stored in the storage unit 12 of the wireless tag 11 to the communication device 20 by performing backscatter modulation on the unmodulated signal. A radio signal from the radio tag 11 is received by the antenna 22.

  A reception signal received by the antenna 22 is supplied to the directional coupler 43 via the low pass filter 44. The directional coupler 43 supplies the reception signal of the antenna 22, that is, the signal from the wireless tag 11 to the reception unit 42. The reception unit 42 includes an I signal generation unit 50, a Q signal generation unit 51, an I signal processing unit 52, a Q signal processing unit 53, and a reception signal level detection unit 54.

  The I signal generation unit 50 includes a mixer 55, a low-pass filter 56, and a binarization circuit 57. The Q signal generation unit 51 includes a mixer 58, a low-pass filter 59, a binarization circuit 60, and a 90-degree phase shifter 61.

 The I signal processing unit 52 includes an I signal synchronous clock generation unit 62, an I signal preamble detection unit 63, an I signal decoding unit 64, and an I signal error detection unit 65. The Q signal processing unit 53 includes a Q signal synchronous clock generation unit 66, a Q signal preamble detection unit 67, a Q signal decoding unit 68, and a Q signal error detection unit 69.

  The receiving unit 42 inputs the received signal from the directional coupler 43 to the first mixer 55 and the second mixer 58, respectively. The receiving unit 42 inputs the local carrier signal from the PLL unit 46 to the first mixer 55 and the 90-degree phase shifter 61. The 90 degree phase shifter 61 shifts the phase of the local carrier signal by 90 degrees and supplies it to the second mixer 58.

  The first mixer 55 mixes the received signal and the local carrier signal to generate an I signal having a component in phase with the local carrier signal. The I signal is supplied to the binarization circuit 57 via the low pass filter 56. The low-pass filter 56 removes an unnecessary high-frequency component from the I signal and extracts an encoded data component. The binarization circuit 57 binarizes the signal that has passed through the low-pass filter 56.

  The second mixer 58 mixes the received signal with the local carrier signal whose phase is shifted by 90 degrees to generate a Q signal that is orthogonal to the local carrier signal. The Q signal is supplied to the binarization circuit 60 via the low pass filter 59. The low-pass filter 59 removes unnecessary high-frequency components from the Q signal and takes out encoded data components. The binarization circuit 60 binarizes the signal that has passed through the low-pass filter 59.

  The I signal binarized by the binarization circuit 57 is supplied to each unit 62 to 65 of the I signal processing unit 52. The Q signal binarized by the binarization circuit 60 is supplied to each of the units 66 to 66 of the Q signal processing unit 53. Since the operations of the I signal processing unit 52 and the Q signal processing unit 53 are the same, the I signal processing unit 52 will be described below, and the description of the Q signal processing unit 53 will be omitted.

  The synchronous clock generation unit 62 always generates a clock signal synchronized with the binarized signal from the binarization circuit 57, and generates the generated clock signal using the reception control unit 70, preamble detection unit 63, and decoding of the communication control unit 36. To the unit 64 and the error detection unit 65.

  The preamble detector 63 detects the preamble added to the head of the I signal based on the clock signal from the synchronous clock generator 62. When the preamble is detected, the preamble detector 63 outputs a detection signal to the reception controller 70 of the communication controller 36. When receiving the preamble detection signal, the reception control unit 70 supplies a decoding start command signal to the decoding unit 64. The decoding unit 64 samples the binarized signal from the binarization circuit 57 in synchronization with the clock signal from the synchronous clock generation unit 62. When receiving a decoding start command from the reception control unit 70, the sampled binary signal is decoded. The decrypted data is supplied to the reception control unit 70.

  The reception control unit 70 supplies the decoded data to the error detection unit 65. The error detection unit 65 detects the presence or absence of an error from the check code of the decoded data. Then, the data indicating the detection result is supplied to the reception control unit 70. The reception control unit 70 determines that data has been correctly received when there is no error in at least one of the I signal and the Q signal. The correctly received data is stored in the storage unit 35 as tag reading information 351.

The reception signal level detection unit 54 detects the amplitude of the I signal that has passed through the low-pass filter 56 and the amplitude of the Q signal that has passed through the low-pass filter 59. Then, the larger amplitude value is notified to the communication control unit 36 as the received signal level. Or you may notify the value of (1) Formula which carried out vector composition of I signal and Q signal as a received signal level.

 In addition to the reception control unit 70, the communication control unit 36 includes a transmission output setting unit 71, a transmission control unit 72, a function setting unit 73, and a reception state detection unit 74. The reception state detection unit 74 calculates a reception success rate during a predetermined time. Alternatively, the reception state may be detected using the average value or the maximum value of the reception signal level notified from the reception signal level detection unit 54 at a predetermined time. The reception success rate can be obtained by equation (2).

Reception success rate = number of times data was correctly received / (number of times data was correctly received + number of times an error was detected)
Hereinafter, a case where the ISO18000-6C protocol is used will be described as an example. The communication device 20 uses the ISO18000-6C protocol, the first reading function (normal reading function), the second reading function (designating a tag to be read, repeating the reading, detecting the reading state, and transmitting the output. A reading function to be controlled) and a third reading function (designated reading function). The communication control unit 36 includes a function setting unit 73, and the function setting unit 73 sets one of the first reading function, the second reading function, and the third reading function. The transmission control unit 72, the transmission output setting unit 71, and the reception state detection unit 74 of the communication control unit 36 are configured to perform corresponding operations according to the functions set by the function setting unit 73.

 The first reading function (normal reading function) is a function that performs reading without designating the wireless tag 11, is activated by receiving radio waves radiated from the antenna 22, and communicates with the wireless tag 11 in a communicable state. The tag ID 13 stored in the storage unit 12 of the wireless tag 11 is read.

  The second reading function (designated repetitive reading function) designates the wireless tag 11 responding by the ISO18000-6 type C Select command, and stores the tag ID 13 and the equipment identification information 14 stored in the storage unit 12 of the wireless tag 11. Repeat reading. The second reading function is a function for controlling the transmission output by the transmission output setting unit 71 according to the reception state detected by the reception state detection unit 74, and narrowing down the existence range of the designated wireless tag 11, which is designated by the operator. It helps to identify the wireless tag 11. In the second reading function, the notification unit 24 notifies the reception state detected by the reception state detection unit 74 of the communication control unit 36.

  The third reading function (designated reading function) is a function that performs reading by designating the wireless tag 11 that responds by the ISO18000-6C Select command, is activated by receiving radio waves radiated from the antenna 22, and is selected. Only the wireless tag 11 that matches the tag ID specified by the command responds, communicates with the wireless tag 11, and reads the tag ID 13 stored in the storage unit 12.

  Hereinafter, the first reading function will be described. FIG. 6 is a flowchart illustrating a processing procedure of the control unit 33 when the wireless tag 11 is read by the first reading function of the wireless tag communication device. The process of the flowchart in FIG. 6 is executed under the control of the CPU 34 by the RFID tag search program stored in the ROM 350.

  When the operator carries the communication device 20 in the target area of FIG. 1 and operates a work start key of the input unit 25, for example, the RFID tag search program is activated. When the wireless tag search program is activated, the communication device 20 receives list information from the host device 100.

 Next, when the operator operates the input unit 25 to input a start key for the first reading function, the control unit 33 sets the first reading function in the operation (Act) A1 of FIG. In operation A2, the operator inputs position information (for example, area 1) near the entrance of area 1 in FIG. 1, for example, as shown in FIG. 2 (a).

  Next, a transmission output setting signal corresponding to a predetermined transmission output in the case of the first reading function is output from the transmission output setting unit 71. In addition, a transmission signal for the first reading function is output from the transmission control unit 72, and the transmission control unit 72 sets transmission timing and the like. In operation A3, normal reading is started by the first reading function. When a transmission output setting signal is output from the transmission output setting unit 71, an unmodulated carrier signal is emitted as a radio wave from the antenna 22, and when a transmission signal is output from the transmission control unit 72, transmission to the wireless tag 11 is performed.

 In operation A4, the control unit 33 determines whether or not there is a key input for ending the first reading function from the input unit 25, and continues normal reading until a key input for ending the first reading function is detected. When there is a key input for ending the first reading function, the process is terminated.

 FIG. 7 is a timing chart illustrating an example of a wireless communication protocol between the communication device 20 and the wireless tag 11 (here, four wireless tags TG1 to TG4). As described above, an example conforming to the ISO18000-6 type C protocol is shown, and the number of slots per round is “4”.

  In FIG. 7, symbols [Q], [R], [A], [ID], and [Qr] all indicate communication data. The beginning of each communication data includes a preamble code indicating the beginning of the data, and each communication data includes an error detection code such as a CRC (Cyclic Redundancy Check) code to detect an error on the receiving side. it can.

 First, the communication device 20 transmits an unmodulated carrier signal from the antenna 22 as a radio wave. Each of the wireless tags TG1 to TG4 is activated in response to this radio wave. Next, the communication device 20 transmits a Query command [Q] for instructing the start of reading in the first round. The Query command [Q] includes a parameter (Q value = 2) that sets the number of slots per round to “4”. Each of the wireless tags TG1 to TG4 generates a random number when it receives the Query command [Q]. Then, each of the wireless tags TG1 to TG4 determines which slot of the four slots in one round responds by using a random number. Similarly, each wireless tag generates response data [R] using random numbers. Since the response data [R] is generated by a random number, the response data [R] has a different value for each wireless tag. Moreover, even if the same wireless tag is used, the value is different every time a random number is generated.

  In the example of FIG. 7, the wireless tag TG2 transmits response data [R] in the first slot 0. When the response data [R] from the wireless tag TG2 is received, the communication device 20 transmits an Acknowledge (Ack) command [A] instructing that the response data [R] is normally received. The Ack command [A] includes response data [R] received from the wireless tag TG2.

 The wireless tag TG2 that has transmitted the response data [R] waits for an Ack command [A]. When the Ack command [A] is received, it is confirmed whether or not the response data [R] transmitted by itself is included. When the response data [R] is included, the wireless tag TG2 recognizes that the Ack command [A] is addressed to itself, and transmits the tag ID [ID] stored in its own memory. When receiving the tag ID [ID], the communication device 20 detects the presence or absence of an error. If there is no error, the communication device 20 stores the received tag ID [ID] as tag reading information 351 in the storage unit 35.

 Next, the communication device 20 transmits a Query-rep command [Qr] to command slot switching. However, the wireless tag TG2 that has already transmitted the response data [R] does not respond even when it receives the Query-rep command [Qr]. In the example of FIG. 7, the wireless tag TG1 transmits response data [R] in the second slot 1. Since the subsequent operation in the second slot 1 is the same as the operation in the first slot 0, description thereof is omitted.

 When the communication in the second slot 1 is completed, the communication device 20 transmits a Query-rep command [Qr] for instructing slot switching. However, the wireless tags TG1 and TG2 that have already transmitted the response data [R] do not respond even when the Query-rep command [Qr] is received.

 In the example of FIG. 7, the wireless tags TG3 and TG4 transmit different response data [R] in the third slot 2, respectively. Since the transmission start time of the response data [R] is defined within a predetermined time after receiving the Query command [Q] or the Query-rep command [Qr], two or more wireless tags in the same slot When each response data [R] is transmitted, a part of the transmission of the response data [R] always collides. For this reason, the communication device 20 cannot receive the response data [R] of the wireless tag TG3 and the response data [R] of the wireless tag TG4, and the communication device 20 detects a reception timeout of the response data [R].

 Next, the communication device 20 transmits a Query-rep command [Qr] for instructing slot switching, and starts the fourth slot 3. However, in the example of FIG. 7, since the wireless tags TG1 to TG4 have already transmitted the response data [R] in round 1, the response data [R] is not transmitted in the fourth slot 3, and the communication device 20 Detects the reception timeout of the response data [R].

 The communication device 20 detects the end of the four slots of round 1 and transmits a Query command [Q] instructing the start of the first slot 0 of the new round 2. In the example of FIG. 7, the wireless tags TG1 and TG2 that have transmitted the tag ID [ID] do not respond after round 2. In the first slot 0 of round 2, the wireless tag TG4 transmits response data [R]. Subsequent operations of the first slot 0 of round 2 are the same as the operations of the first slot 0 of round 1, and thus description thereof is omitted.

 When the communication in the first slot 0 of round 2 is completed, the communication device 20 transmits a Query-rep command [Qr] instructing slot switching. In the second slot 1 of round 2, the wireless tag TG3 transmits response data [R]. When receiving the response data [R] from the wireless tag TG3, the communication device 20 transmits an Ack command [A] instructing that the response data [R] is normally received. In FIG. 7, for example, the wireless tag TG3 is behind the scene, the signal of the Ack command [A] transmitted by the communication device 20 is attenuated, and the wireless tag TG3 detects a reception error when receiving the Ack command [A]. Show.

 After transmitting the Ack command [A], the communication device 20 waits for reception of the tag ID [ID] from the wireless tag TG3. However, the communication device 20 receives a reception timeout, and similarly switches to the next slot. Thereafter, the communication device 20 performs the same operation as described above, and communicates with a large number of wireless tags in the target area (Area) by the normal reading function, and receives the tag ID [ID].

  Returning to the description of FIG. 6, the control unit 33 detects whether or not the tag ID 13 has been read by the first reading function in operation A5. When the reading is detected (when the determination of operation A5 is YES), the position information of the list corresponding to the read tag ID 13 is compared with the position information set by the position information setting unit 252 in operation A6. Part 37 compares. In the operation A7, it is determined whether or not the respective position information matches. When the position information does not match (when the determination in the operation A7 is NO), the position information of the list is acquired from the position information setting unit 252 in the operation A8. Update to the set location information.

  For example, when the operator performs reading with the first reading function in the area 1, the position information setting unit 252 sets the area 1, but the position information of the list corresponding to the tag ID of the read wireless tag 11 is “ If it is “0100” (possibly existing in area 3), the position information is changed to “0001” (possibly existing in area 1). After updating the list information, the process returns to operation A4, and if there is a reading end input, the process ends. Although not shown, the updated position information is displayed on the notification unit 24. In addition, after the reading is completed, the updated list information is transmitted from the communication device 20 to the host device 100.

 Therefore, the position information is updated to the latest information, the difference between the position information (area) in the list and the position (area) where the equipment is actually located is reduced, and the search can be performed in a short time.

 When the reading end is input in operation A4, for example, in operation A9, the communication device 20 compares the tag reading information with the information of the wireless tag 11 in which the position information of the list is area 1, and the position of the list The presence / absence of a wireless tag that cannot be read among the wireless tags 11 whose information is in area 1 is detected. If there is a wireless tag that could not be read (when the determination in operation A9 is YES), the position information of the list is changed to “1110” (possibly existing outside area 1) in operation A10. .

 By updating the position information to the latest information, it can be understood that there is a device corresponding to the wireless tag outside the area 1, and the operator can narrow down the existence range of the target device. Therefore, the operator can search in a short time. Also, the operator should have the target equipment in the search area, but when there is no actual equipment, there is no waste of performing the search operation many times in the area, and the search time can be shortened. It also reduces the mental burden.

(Second Embodiment)
Next, a second embodiment in which the processing procedure of the control unit is in another mode will be described with reference to FIGS. 8A, 8B, and 9. FIG. In the second embodiment, for example, when there is equipment that should be in another area in area 1, the second reading function searches for a wireless tag that should be in another area, and the searched equipment is the original area. The difference between the position information of the list and the actual position of the equipment is reduced by returning to the above.

  8A and 8B are flowcharts showing the processing procedure of the control unit 33 in the second embodiment. Similarly to FIG. 6, when the operator carries the communication device 20 in the target area of FIG. 1 and operates the work start key of the input unit 25, for example, the RFID tag search program is activated. When the wireless tag search program is activated, the communication device 20 receives list information from the host device 100.

  Next, when the operator operates the input unit 25 to input the first reading function start key, the control unit 33 sets the first reading function in operation A11 of FIG. 8A. In operation A12, the operator inputs position information (area 1) as shown in FIG. 2A, for example, near the entrance of area 1 in FIG. And the control part 33 starts normal reading by the 1st reading function by operation | movement A13.

 In operation A14, the control unit 33 determines whether or not there is a key input for ending the first reading function from the input unit 25, and continues normal reading until a key input for ending the first reading function is detected. When there is a key input for ending the first reading function (when the determination of operation A14 is YES), the process ends.

  Further, the control unit 33 detects whether or not the tag ID is read by the first reading function (normal reading function) in the operation A15, and when detecting that the tag ID is read (when the determination of the operation A15 is YES). In operation A <b> 16, the comparison unit 37 compares the position information of the list corresponding to the read tag ID with the position information set from the position information setting unit 252.

  In the next operation A17, it is determined whether or not the position information matches. When the position information does not match (when the determination in operation A17 is NO), the control unit 33 changes from the first reading function to the second reading function in operation A18. Switch to (designated repeat reading function) and search for a wireless tag. Although not shown, it may be switched when the operator operates the input unit 25 to switch to the second reading function.

  FIG. 8B is a flowchart illustrating a processing procedure of the second reading function. In FIG. 8B, the control unit 33 displays on the display 24 the switch to the second reading function in operation A22. The control unit 33 sets the second reading function by the function setting unit 73 of the communication control unit 36 (operation A23). In operation A <b> 23, a transmission output setting signal corresponding to a predetermined initial value of transmission output in the case of the second reading function is output from the transmission output setting unit 71.

  The transmission control unit 72 outputs a transmission signal in the case of the second reading function, and the transmission control unit 72 sets transmission timing and the like. Here, in order to simplify the description, the initial value of the transmission output is assumed to be the maximum value of the transmission output that can be set by the communication device 20. The second reading function repeats reading by specifying a wireless tag to be read, detects a reading state, and controls transmission output. In operation A24, the tag ID (tag ID) of the wireless tag 11 is set. The wireless tag 11 is specified (Hereinafter, the wireless tag TG4 in FIG. 9 matches the search condition, the tag ID of the TG4 is set, and reading by the second reading function will be described below).

  The controller 33 starts the reading operation by the second reading function in operation A25. When a transmission output setting signal is output from the transmission output setting unit 71, an unmodulated carrier signal is emitted as a radio wave from the antenna 22, and when a transmission signal is output from the transmission control unit 72, transmission to the wireless tag 11 is performed.

 FIG. 9 is a timing chart illustrating an example of a wireless communication protocol between the communication device 20 and the wireless tag TG4. As in FIG. 7, an example conforming to the ISO18000-6 type C protocol is shown, and the number of slots per round is “1”.

 The symbols [S], [Q], [R], [A], and [ID] all indicate communication data. Each communication data includes a preamble code indicating the beginning of the data, and each communication data except [S] includes an error detection code such as a CRC (Cyclic Redundancy Check) code. Can detect errors on the side. A circle “◯” in FIG. 9 means that the tag ID [ID] of the communication device 20 has been successfully received in each round. The symbol “×” means reception failure.

  First, as described above, the communication device 20 transmits an unmodulated carrier signal from the antenna 22 as a radio wave. Next, the communication device 20 transmits a Select command [S] and then a Query command [Q] to start the first round R1. The Select command [S] sets the tag ID of the wireless tag TG4 so that only the wireless tag TG4 that is the target of the designated repeated reading function responds.

 When a wireless tag other than the wireless tag TG4 receives the Select command [S] and the Query command [Q], the other wireless tag determines that a tag ID different from its own tag ID is specified. The response signal [R] is not transmitted. The first round R1 is an example in which the communication device 20 detects a reception timeout while waiting for the response signal [R] because sufficient radio waves have not reached the wireless tag TG4.

  The communication device 20 selects the Select command [S] in which the tag ID of the wireless tag TG4 is set so that only the wireless tag TG4 responds when the time t1 has elapsed since the start of transmission of the Select command [S] of the round R1. A Query command [Q] is transmitted to start the second round R2. The second round R2 indicates a case where the communication device 20 correctly receives the tag ID [ID] from the wireless tag TG4.

 Thereafter, the communication device 20 similarly selects the Select command [S] and the Query in which the tag ID of the wireless tag TG4 is set so that only the wireless tag TG4 responds when the time t1 has elapsed since the start of transmission of the Select command [S]. The command [Q] is transmitted to start the next round. In round R5, R6, and round R8, after the communication device 20 transmits the Ack command [A], a reception timeout is detected while the communication device 20 waits for the tag ID [ID], and the tag ID [ID] Shows an example in which the reception of the message fails.

 In addition, the control unit 33 detects whether or not the tag ID [ID] is correctly received in each round, and calculates the communication success rate including, for example, the reception possibility result of the tag ID [ID] in the previous three rounds. To do. In the example of FIG. 9, the communication success rate SV calculated in the round R4 is 75% from the result of whether or not the tag ID [ID] is received from the round R1 to the round R4. The communication success rate SV calculated in round R5 is 75% from the result of whether or not the tag ID [ID] from round R2 to round R5 can be received.

  Returning to FIG. 8B, in operation A26, the control unit 33 detects whether or not the tag ID [ID] of the wireless tag 11 can be read in each round. Further, the communication state is calculated in operation A27. In operation A27, the communication success rate SV is calculated as the communication state. Further, the calculated communication success rate SV may be displayed on the display 24.

 Next, the control unit 33 compares the calculated communication success rate SV with the threshold value a (operation A28). When the communication success rate SV is larger than the threshold value a, it is determined that the communication state is good. For example, the threshold value a = 70%. In addition, when the communication success rate SV is larger than the threshold value a, the control unit 33 indicates, for example, “There is a target wireless tag in the direction facing the antenna” in operation A29 to indicate that the communication state is good. , Please proceed in that direction "on the display 24 to notify.

 In addition, in operation A30, the control unit 33 compares the current transmission output of the communication device 20 with the preset minimum value of the transmission output of the second reading function. When the transmission output of the communication device 20 is set to the minimum value, the reading range when the target wireless tag is specified by the second reading function is minimized. The initial value, maximum value and minimum value of the transmission output in the second reading function are set in advance by the operator.

 When the current transmission output is larger than the minimum value, the control unit 33 reduces the transmission output by one step in operation A31 and narrows the reading range. When the current transmission output is the minimum value (when the determination in operation A30 is YES), in operation A38, “the target wireless tag exists within the minimum reading range” and “the second reading function is terminated. Then, the display 24 is displayed to switch to the first reading function.

 If the communication success rate SV is less than or equal to the threshold value a in operation A28, the control unit 33 compares the communication success rate SV with the threshold value b in operation A32. The threshold value b is determined that the communication state is bad when the communication success rate SV is smaller than the threshold value b. For example, the threshold value b = 30%. In operation A33, the control unit 33 compares the current transmission output of the communication device 20 with the preset maximum value of the transmission output of the second reading function. When the current transmission output is smaller than the maximum value (when the determination in operation A33 is NO), the transmission output is increased by one step in operation A34.

 When the communication state is larger than the threshold value b in operation A32 (when the determination of operation A32 is NO), and when the transmission output is the maximum value in operation A33 (when the determination of operation A33 is YES), further transmission is performed in operation A34. When the output is increased by one step, the control unit 33 determines whether or not there is a key input for ending the second reading function in the operation A35, and when detecting the end key input (the determination in the operation A35 is YES). In the case of (2), the display 24 indicates that “the input to end the second reading function has been detected, so that the first reading function is switched” is displayed on the display 24 (operation A38), and the process proceeds to operation A19 in FIG. 8A. When the end key input is not detected (when the determination of operation A35 is NO), the reading operation by the second reading function is continued.

 In operation A36, the control unit 33 determines whether or not t1 time has elapsed from the start of the round, and when detecting that t1 time has elapsed from the start of the round, the control unit 33 selects the Select command [S that sets the tag ID of the wireless tag TG4. ], A Query command [Q] is transmitted to start the next round (operation A37), and the process returns to operation A26 to repeat the process.

  Returning to FIG. 8A, when the target device (wireless tag) is searched for in area 1 by the second reading function in operation A18, and the search by the second reading function is completed in operation A19 (the determination in operation A19 is YES). ), The list information is updated in operation A20. In operation A20, the position information in the list is updated to the position information set from the position information setting unit 252 when the comparison result in the comparison unit 37 does not match in operation A17. In the operation A21, the operation is switched to the first reading function, and the operation returns to the operation A14.

  The process of FIG. 8A assumes a case in which, for example, there is equipment that should be in area 1 other than area 1 (for example, area 2). The operator searches for the target equipment (wireless tag) in the area 1 by using the communication device 20 in which the second reading function is operated, thereby searching for the equipment (wireless tag) that should originally be in the area 2. be able to. Therefore, the operator returns the searched equipment to the original area (list position information area), so that the difference between the position information of the list and the actual position of the equipment is reduced, and the search can be performed in a short time. .

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. In the third embodiment, for example, when a device (wireless tag) that should be in area 1 cannot be read in area 1, the communication apparatus 20 in which the second reading function is activated is provided and an area other than area 1 is used. Then, the target device (wireless tag) is searched for by the second reading function, and the position information of the list corresponding to the target wireless tag is updated when the search is successful.

  10, operation A41 to operation A48 are the same as operation A1 to operation A8 of FIG. It is assumed that the operator carries the communication device 20 and reads the wireless tag 11 in the area 1. When the operator starts the program of the communication device 20, the communication device 20 receives list information from the higher-level device 100.

  The operator operates the input unit 25 in operation A41 to input a start key for the first reading function. In operation A42, the operator inputs position information (for example, area 1) near the entrance of area 1 in FIG. 1, for example, as shown in FIG. 2 (a).

  In operation A43, normal reading is started by the first reading function. In operation A44, the control unit 33 determines whether or not there is a key input for ending the first reading function from the input unit 25, and continues normal reading until a key input for ending the first reading function is detected. When there is a key input for ending the first reading function, the process is terminated.

  In operation A45, the control unit 33 detects whether or not the tag ID 13 has been read by the first reading function. When the control unit 33 detects that the tag ID 13 has been read, the position information of the list corresponding to the read tag ID 13 is read in operation A46. The comparison unit 37 compares the position information set from the position information setting unit 252.

  In operation A47, it is determined whether or not the comparison information matches. If they do not match, the list position information is updated to the position information set by the position information setting unit 252 in operation A48. Therefore, the position information is updated to the latest information, the difference between the position information (area) in the list and the position (area) where the equipment is actually located is reduced, and the search can be performed in a short time.

  If the reading end is input in operation A44, in operation A49, the communication device 20 compares the tag reading information with the information of the wireless tag 11 whose list position information is area 1 (0001). The presence / absence of a wireless tag that could not be read out of the wireless tags 11 whose list position information is area 1 is detected.

  If there is a wireless tag that could not be read, in operation A50, the tags that have not been read are designated one by one and switched to the second reading function (designated repeated reading function). In the example described above, since the equipment (wireless tag) that should be in area 1 cannot be read in area 1, the operator has the communication device 20 in which the second reading function is activated and is not in area 1. Go to the area and search for the target equipment (wireless tag). In each area, position information (area where the operator is present) is input by the position information setting unit (operation A51).

  When the operator finds the target equipment (wireless tag) and the second reading function end key is input from the input unit 25, the control unit 33 detects the end input and ends the search by the second reading function (operation) A52). In operation A53, the position information in the list corresponding to the wireless tag of the target equipment is updated to the area set by the position information setting unit 252 (the area where the operator has found the target wireless tag), and the process ends. Further, the updated area information is transmitted to the upper device 100.

  By updating the position information to the latest information, the difference between the position information (area) in the list and the position (area) where the equipment is actually located is reduced, and the search can be performed in a short time.

  Further, as shown in FIG. 11, the operator operates the second reading function (designated repeated reading function) in which the target equipment is designated from the beginning, and after the search is completed, the position information of the list and the target equipment (wireless tag) If the position information is different, the position information in the list may be updated to the found position information.

  That is, in FIG. 11, the operator operates the input unit 25 and inputs the start key for the second reading function (operation A61). In operation A62, the operator inputs position information near the entrance of area 1 in FIG. 1, for example, as shown in FIG.

  In operation A63, reading is started by the second reading function. In operation A64, the control unit 33 determines whether or not there is a second reading function end key input from the input unit 25 (whether or not the search ends), and detects the second reading function end key input. Continue reading until.

  When the tag ID is read by the second reading function, the control unit 33 compares the position information of the list corresponding to the read tag ID with the position information set by the position information setting unit 252 in operation A65. Part 37 compares. In operation A66, it is determined whether or not the comparison information matches. If they match, the process ends. If the position information does not match, the position information of the list is obtained from the position information setting unit 252 in operation A67. Update to the set location information.

  Therefore, the position information is updated to the latest information, the difference between the position (area) information in the list and the position (area) where the equipment is actually located is reduced, and the search can be performed in a short time.

(Fourth embodiment)
Next, a fourth embodiment will be described. In the fourth embodiment, as shown in FIG. 1, the second wireless tag 15 is attached near each entrance of the areas 1 to 4.

  FIG. 12A shows the data structure of the second wireless tag 15. The second wireless tag 15 has a storage unit, and identification information 16 indicating the second wireless tag and position (area) information 17 indicating a storage area of the equipment are stored in the storage unit.

  In the previous embodiment, an example in which position information is input by the position information setting unit 252 when entering each area has been shown. However, in the fourth embodiment, the second wireless tag 15 is provided in areas 1 to 4. By reading the second wireless tag 15, it is not necessary to input position information at the position information setting unit 252.

  That is, the comparison unit 37 compares the position information indicating the storage area read from the second wireless tag 15 with the position information on the list, instead of the position information input by the position information setting unit 252.

  FIG. 12B is a timing chart illustrating an example of a wireless communication protocol according to the fourth embodiment. 9 is similar to the operation of rounds R1 and R2 in FIG. 9, but only the portion of identification information 16 indicating the second wireless tag 15 is specified by the select command [S], and the third reading function is set. Then, the position information indicating the storage area is read. 9 is different from FIG. 9 in that the third reading function is terminated if it can be read once.

  When the operator enters each area, the operator can set the position information by operating the communication device 20 and selecting the third reading function. Alternatively, although not shown, when another reading function (the first reading function or the second reading function) is performed, it may be switched to the third reading function that designates the second wireless tag 15 periodically. Good. Therefore, the operator does not need to input the position information at the position information setting unit 252, the burden is lightened, and the erroneous input of the position information is reduced.

(Fifth embodiment)
Next, a wireless tag communication apparatus according to the fifth embodiment will be described. FIG. 13 is a block diagram of the RFID tag communication apparatus according to the fifth embodiment. The RFID tag communication apparatus 20 is composed of the RFID tag communication apparatus 20 and the higher-level device (server) 100. Is attached. Hereinafter, the wireless tag communication device 20 is referred to as the communication device 20.

  The communication device 20 includes a notification unit 24, an input unit 25, a wireless tag communication unit 30, a power supply unit 31, a communication unit 321 with a host device, and a control unit 33. The control unit 33 includes a CPU 34, a storage unit 35, and a communication control unit 36.

 The notification unit 24 includes a display and a buzzer, and the input unit 25 includes a keyboard and a touch panel configured on the display of the notification unit 24. The power supply unit 31 includes a battery and a battery charge / discharge control circuit. The communication unit 321 manages communication with the higher-level device 100 connected via a communication line. The communication line may be wired or wireless.

 The control unit 33 controls the input unit 25, the notification unit 24, the wireless tag communication unit 30, and the power supply unit 31 under the control of the CPU 34. The communication control unit 36 includes a function setting unit, and sets one of the first reading function and the second reading function.

 The host device 100 includes a communication unit 322, a comparison unit 37, a CPU 75, and a storage unit 76. The communication unit 322 performs communication with the communication device 20. The CPU 75 controls the overall operation of the host device 100.

 The ROM 760 of the storage unit 76 stores programs and setting data used by the control unit 33 in advance. Further, the storage unit 76 stores RFID tag reading information 761 including the tag ID received by the RFID tag communication unit 30 and list information 762, position information 763 input when reading is started in each area, and the like.

 The communication unit 321 of the communication device 20 and the communication unit 322 of the higher-level device 100 communicate information with each other, and the communication device 20 transmits information read from the wireless tag 11 to the higher-level device 100 or from the higher-level device 100 to the comparison unit. The comparison result by 37 is received. The communication control unit 36 switches between the first reading function and the second reading function in response to the setting of the first reading function and the second reading function and the received comparison result. The operation and processing procedure of the RFID tag communication apparatus in FIG. 13 are as described in FIGS. 8A and 8B or FIGS. 9A and 9B.

 In FIG. 4 (first embodiment), the communication apparatus 20 receives list information from the host device 100 using a wireless LAN or the like, and compares the position information of the list information with the position information set by the position information setting unit 252. In FIG. 14, the communication device 20 does not receive the list information from the higher-level device 100 and sets the tag reading information 351 read by the communication device 20 and the position information setting unit 252. The position information 353 is transmitted to the host device 100 via the communication units 321 and 322. The storage unit 76 of the host device 100 stores tag reading information 761 and position information 763 corresponding to the tag reading information 351 and the position information 353.

  On the host device 100 side, position information corresponding to the tag reading information 351 read by the wireless device 20 is extracted from the list information 762, and the extracted position information and the position information 763 set by the position information setting unit 252 are compared. 37, and the comparison result is transmitted from the host device 100 to the communication device 20 and displayed on the communication device 20. Also in the configuration of FIG. 13, as described above, it is clear that the difference between the position information of the list and the information of the actual position of the equipment can be reduced, and the equipment searching time can be shortened.

  13 controls the wireless tag communication function between the wireless tag communication device 20 and the host device 100, respectively, but the control unit 33 and the storage unit 35 of FIG. You can also In this case, the communication function of the wireless tag is mainly controlled by the host device 100. Whether the subject of control is performed on the RFID tag communication apparatus 20 side, the higher-level device 100 side, or in half is determined by the control unit 33, the storage unit 35, the comparison unit 37, the list information setting unit 251, and the position information setting. The input unit 25 including the unit 252 is determined depending on which of the RFID tag communication apparatus 20 and the host device 100 is arranged, and can be arbitrarily designed. For example, the input unit 25 can be configured in the host device 100.

  In the embodiment described above, it is possible to provide a wireless tag communication device that reduces the difference between the position information of the list and the actual position of the equipment and shortens the search time.

  In the above description of each embodiment, the list information has been described as being combined into one. However, the list information may be divided into areas. In addition, when updating the position information of the list, it may be displayed on the display 24 as to whether or not it can be updated.

  Further, although the server has been described as an example of the host device 100, the host device 100 may be configured by a notebook personal computer, a smartphone (multifunctional mobile phone), a tablet terminal, or the like in addition to the server.

  In addition, although several embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and gist of the invention.

11 ... wireless tag,
12 ... wireless tag storage unit,
15 ... second wireless tag 20 ... wireless tag communication device,
22 ... Antenna,
24. Display (notification part),
25 ... Input section,
251 ... List information setting section,
252 ... Location information setting unit,
30 ... RFID tag communication unit,
33 ... control unit,
34,75 ... CPU
35, 76 ... storage unit 350, 760 ... ROM
36 ... Communication control unit 37 ... Comparison unit 100 ... Host device (server, etc.)

Claims (7)

A wireless tag communication unit that is provided in a plurality of articles, communicates with a wireless tag that stores identification information, and communicates with a first reading function that performs a reading operation without specifying the wireless tag;
A storage unit for storing information on a list in which identification information of the wireless tag is associated with position information where the article exists;
A position information setting unit for inputting position information for reading the wireless tag;
A comparison unit that compares the position information on the list corresponding to the identification information of the wireless tag read by the first reading function and the position information input by the position information setting unit;
A list information setting unit for changing the position information on the list to the position information input from the position information setting unit when the position information compared by the comparison unit is different;
A wireless tag communication device comprising:   When the wireless tag communication unit cannot read a wireless tag that should exist in an area corresponding to the position information of the list, the list information setting unit displays the position information on the list of the wireless tag that could not be read, The wireless tag communication apparatus according to claim 1, wherein the wireless tag communication apparatus is changed to position information indicating an area other than an area. The wireless tag communication unit is capable of communicating with the wireless tag by a second reading function that performs a repeated reading operation by setting a transmission output according to a reading state of a designated wireless tag,
The wireless tag is searched by switching to the second reading function when the wireless tag is read by using the first reading function and the positional information compared by the comparison unit is different. The wireless tag communication device according to 1. The wireless tag communication unit is capable of communicating with the wireless tag by a second reading function that performs a repeated reading operation by setting a transmission output according to a reading state of a designated wireless tag,
When the wireless tag communication unit cannot search for the wireless tag that should exist in the area corresponding to the position information of the list when searching for the wireless tag by the first reading function, the second reading function The wireless tag communication device according to claim 1, wherein the wireless tag is searched for by switching to the wireless communication device. The wireless tag communication unit is capable of communicating with a second wireless tag storing position information indicating the storage area of the article, and performs a reading operation by designating the second wireless tag. Reading the second wireless tag by
The comparison unit compares the position information indicating the storage area read from the second wireless tag with the position information on the list, instead of the position information input by the position information setting unit. 4. The wireless tag communication device according to 4. A wireless tag communication device that is provided in a plurality of articles and communicates with a wireless tag that stores identification information, and a host device. The wireless tag communication device performs a reading operation without designating the wireless tag. A wireless tag communication system having a wireless tag communication unit that communicates with the wireless tag with a reading function of:
The wireless tag communication system includes:
A storage unit for storing information on a list in which identification information of the wireless tag is associated with position information where the article exists;
A position information setting unit for inputting position information for reading the wireless tag;
A comparison unit that compares the position information on the list corresponding to the identification information of the wireless tag read by the first reading function and the position information input by the position information setting unit;
A list information setting unit for changing the position information on the list to the position information input from the position information setting unit when the position information compared by the comparison unit is different;
A wireless tag communication system comprising: A wireless tag communication program that is provided in a plurality of articles, communicates with a wireless tag that stores identification information, and searches and processes the information stored in the wireless tag,
A communication function for communicating with the wireless tag by a first reading function for performing a reading operation without designating the wireless tag;
Position information corresponding to the identification information of the wireless tag read by the first reading function is stored from a storage unit that stores information of a list in which identification information of the wireless tag and position information where the article exists are stored. An extraction function to extract from the list;
A comparison function for comparing the extracted position information with the position information for reading the wireless tag input from the position information setting unit;
A change function for changing the position information on the list to the position information input from the position information setting unit when the pieces of position information compared by the comparison function are different;
RFID tag communication program for realizing

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