JPH11149530A - Radio data transmission processing system, radio data transmission processor, radio tag system and radio tag processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio tag system capable of improving availability factor as a whole by smoothing and quickening the transmission of read data from a radio tag to a host device. SOLUTION: Each data are read by radio from plural radio tags A-E by a reader-writer 2, and each read data are transmitted to a host device 1 in the radio tag system. In this case, the transmission of each read data from each radio tag A-E from the reader-writer 2 to the host device 1 is operated in the order of reading of data from the radio tags A-E.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a wireless data transmission processing system, a wireless data transmission processing device, a wireless tag system, and a wireless tag processing device.

[0002]

2. Description of the Related Art In a conventional wireless tag system, a wireless reader / writer (hereinafter referred to as "reader / writer") gives an activation command to a plurality of wireless tags (hereinafter referred to as "tags"), and a plurality of tags respond almost simultaneously with a response signal. (Response) and read the data in a multi-read (simultaneous multiple reading) wireless tag system.
The data read and collected by the reader / writer is
Normally, all data from a plurality of tags are transmitted to a host device at a higher level.

A conventional example of such a wireless tag system will be described with reference to FIG.

The wireless tag system includes five tags A to E, a reader / writer (R / W) for performing multi-read on the tags A to E, and a host device.

The reader / writer first transmits a start command (shown by (1) in FIG. 9) to the five tags A to E. Among the five tags A to E that have received this activation command, a response signal (shown by (2) in FIG. 9) including data is first transmitted from the tag A to the reader / writer, and then a response is transmitted from the tag C. A signal (indicated by (2) in FIG. 9) is sent to the reader / writer,
Next, response signals (indicated by (2) in FIG. 9) are simultaneously transmitted from the tags B and D to the reader / writer, and finally response signals (indicated by (2) in FIG. 9) are transmitted from the tag E to the reader / writer. Suppose that it was done.

In this case, the response signals transmitted simultaneously from the tags B and D collide (indicated by (5) in FIG. 9), and the reader / writer cannot read the response signals transmitted from the tags B and D. become unable.

Therefore, the reader / writer sends a sleep command (indicated by (4) in FIG. 9) to the tags A, C, and E that have received the response signal, and transmits a start command again to respond to the response from the tags B and D. Read signals sequentially.

[0008] In this way, the response signals from all the tags A to D are read, and after all the data have been collected, all the data is transmitted to the host device at a higher level (shown by (3) in FIG. 9).

[0009]

However, in the case of the above-described conventional wireless tag system, the data amount and the frequency of data collision increase as the number of tags increases, so that the reader / writer reads data from all tags. It takes time, and the transmission of data from the reader / writer to the host device is delayed. As a result, the display of data on the host device side is delayed, and the operator may be confused as to whether the wireless tag system is operating normally or has stopped due to malfunction.

Accordingly, the present invention provides a wireless data transmission processing system and a wireless data transmission processing which can facilitate and speed up the transmission of read data from a wireless data processing means to a host device and can improve the operation rate as a whole. Equipment and
It is an object of the present invention to provide a wireless tag system and a wireless tag processing device capable of facilitating and speeding up transmission of read data from a wireless tag to a host device and realizing an improvement in operation rate as a whole.

[0011]

According to the first aspect of the present invention,
A wireless data transmission processing system for wirelessly reading data from a plurality of wireless data transmission media by wireless data processing means and transmitting the plurality of read data to a host device, wherein each time data is read from each wireless data transmission medium, And transmitting the read data read from each wireless data transmission medium from the wireless data processing means to the host device until the reading of data from all the wireless data transmission media is completed.

According to this invention, transmission of each read data from each wireless data transmission medium from the wireless data processing means to the host device is performed until reading of data from all the wireless data transmission media is completed. From, to facilitate the transmission of read data from the wireless tag to the host device,
It is possible to speed up the operation and improve the operation rate of the entire system.

According to a second aspect of the present invention, there is provided a wireless data transmission processing system for wirelessly reading data of a plurality of wireless data transmission media by wireless data processing means and transmitting the plurality of read data to a host device. When each data of each wireless data transmission medium is wirelessly read by the data processing means, it is checked whether there is a collision of the read data, and if there is no collision of the read data, all the read data is transmitted to the host device. If there is a collision of the read data, all the read data is transmitted to the host device, and the data is reread from the wireless data transmission medium in which the data collision occurred, and each data by the rereading is transmitted to the host device. It is characterized in that it is transmitted to a device.

According to the present invention, all the read data from each wireless data transmission medium is transmitted from the wireless data processing means to the host device, and the presence or absence of collision of the read data is checked. If all the data is read, all the read data is transmitted to the host device, and the data is reread from the wireless data transmission medium in which the data collision occurred, and each data by the reread is transmitted to the host device. Therefore, a measure against a collision of read data is also thorough.

According to a third aspect of the present invention, there is provided a wireless data transmission processing system for wirelessly reading each data of a plurality of wireless data transmission media by wireless data processing means and transmitting the plurality of read data to a host device. While each data of each wireless data transmission medium is wirelessly read by the wireless data processing means, each read data is transmitted to the host device before receiving the polling signal in response to the polling signal from the host device. In addition, a wireless data transmission medium from which data has not been read is read.

According to the present invention, while the wireless data processing means wirelessly reads each data from each wireless data transmission medium, the wireless data processing means waits until receiving the polling signal in response to the polling signal from the host device. Since each data read in the meantime is transmitted to the host device and the wireless data transmission medium from which data has not been read yet is read, the management of data collection timing of each wireless data transmission medium by the host device is thorough. It is also possible to improve the operation rate of the entire system.

According to a fourth aspect of the present invention, there is provided a wireless data transmission processing system wherein wireless data processing means wirelessly reads a plurality of data from a plurality of wireless data transmission media and transmits the plurality of read data to a host device. When each data of each wireless data transmission medium is wirelessly read by the wireless data processing means, the presence or absence of collision of the read data is inspected, and a polling signal is periodically transmitted from the host device to the wireless data processing means to perform polling. Transmits read data without collision of read data to the host device before receiving a signal, and if there is collision of read data, the wireless data transmission medium in which data collision occurred by the wireless data processing means From the host device and periodically transmitted to the wireless data processing means. It is characterized in that for transmitting the data of the host device F by re-reading according to the subsequent polling signal that.

According to the present invention, the same operation as that of the third aspect of the present invention is exhibited, and a countermeasure in the event of a collision of read data is also thorough.

According to a fifth aspect of the present invention, a wireless data transmission processing apparatus wirelessly communicates with a plurality of wireless data transmission media for wirelessly transmitting data, thereby controlling the entire control of a plurality of read data. A wireless data transmission processing device for performing transmission to a host device that performs data collection, a receiving unit that reads data from the plurality of wireless data transmission media under the control of the host device, and a plurality of read wireless data transmission media. Wireless data processing means for sequentially transmitting each of the data to the host device in the order of reading.

According to the present invention, transmission of read data from each wireless data transmission medium is performed in the reading order from the wireless data processing means to the host device.
It is possible to provide a wireless data transmission processing device that facilitates and speeds up the transmission of read data from a wireless data transmission medium to a host device and can improve the operation rate of the entire system.

According to a sixth aspect of the present invention, there is provided a wireless tag system for wirelessly reading data from a plurality of wireless tags by a reader / writer and transmitting the plurality of read data to a host device. Each time the wireless tag is read, the read data read from each wireless tag is transmitted from the reader / writer to the host device, and the reading of data from all wireless tags is completed.

According to the present invention, transmission of each read data from each wireless tag from the reader / writer to the host device is performed until reading of data from all wireless tags is completed. Regardless, the transmission of read data from a plurality of wireless tags to the host device can be facilitated and speeded up, and the operation rate of the entire system can be improved.

According to a seventh aspect of the present invention, there is provided a wireless tag system for reading data of a plurality of wireless data transmission media by a reader / writer wirelessly and transmitting the read plurality of data to a host device. When each data of the data transmission medium is read wirelessly, the presence or absence of collision of the read data is checked. If there is no collision of the read data, all the read data is transmitted to the host device, and the read data is read. If there is a collision,
All the read data is transmitted to the host device, and the data from the wireless tag in which the data collision occurred is re-read, and each data by re-reading is transmitted to the host device. .

According to the present invention, all of the read data from each wireless tag is transmitted from the reader / writer to the host device, and the presence or absence of collision of the read data is checked. Transmitting all the read data to the host device, re-reading the data from the wireless tag in which the data collision occurred, and transmitting each data by re-reading to the host device. In the event of a collision, thorough measures will be taken.

According to an eighth aspect of the present invention, there is provided a wireless tag system for wirelessly reading each data of a plurality of wireless tags by a reader / writer and transmitting the plurality of read data to a host device. While reading each data of the wireless tag, in response to the polling signal from the host device, each data that has been read before the polling signal is received is transmitted to the host device, and the wireless tag that has not yet read the data is transmitted. Is read.

According to the present invention, each data is read wirelessly from each wireless tag by the reader / writer,
In response to a polling signal from the host device, each data that has been read before the polling signal is received is transmitted to the host device, and the wireless data transmission medium from which data has not been read is read. As a result, the data collection timing of each wireless tag can be thoroughly managed, the reading process can be facilitated, and the operation rate of the entire system can be improved.

According to a ninth aspect of the present invention, there is provided a wireless tag system which wirelessly reads each data from a plurality of wireless tags by a reader / writer and transmits each read data to a host device. When reading each data of the wireless tag wirelessly, it checks whether there is collision of the read data, periodically transmits a polling signal from the host device to the reader / writer, and reads the read data before receiving the polling signal. Transmission of the read data without collision to the host device, and if there is a collision of the read data, reread the data from the wireless tag in which the data collision occurred by the reader / writer,
Data is transmitted to the host device by re-reading according to a subsequent polling signal periodically transmitted from the host device to the reader / writer.

According to the present invention, the same action as that of the invention described in claim 8 is exerted, and a countermeasure in the event of a collision of read data is also thorough.

The wireless tag processing device according to the tenth aspect of the present invention wirelessly communicates with a plurality of wireless tags, each of which wirelessly transmits data, to thereby control a plurality of read data as a whole and perform data control. In a wireless tag filtering device for transmitting data to a host device that performs collection, receiving means for reading data from the plurality of wireless data transmission media under the control of the host device; and A wireless data processing means for transmitting data to the host device in reading order is provided.

According to the present invention, the transmission of each read data from each wireless tag from the reader / writer to the host device is performed in the order of reading the data from the wireless tags, so that the wireless tag transmits the data to the host device. It is possible to provide a wireless tag processing device that can facilitate and speed up the transmission of the read data and improve the operation rate of the entire system.

[0031]

Embodiments of the present invention will be described below in detail.

FIG. 1 shows an overall configuration of a wireless tag system constituting a wireless data processing system according to an embodiment of the present invention. For example, tags A to E, which are five wireless data transmission media, and tags A reader / writer (R / R) that is a wireless data processing unit that performs multi-read for A to E
W) 2, a host device 1 for controlling the entire system including the reader / writer 2, and a display device 3.

As shown in FIG. 2, the reader / writer 2 is connected to the host device 1 to transmit a start command, a sleeping command, etc., read data from the five tags A to E, and transmit the data to the host device 1. And a transmission circuit 5 for wirelessly transmitting a start command, a sleeping command, and the like to the five tags A to E via the transmission antenna 6.
And a receiving circuit 7 that receives wireless data from the five tags A to E via the receiving antenna 8.

The tag A includes a modulation / demodulation circuit 12 for transmitting and receiving data and commands to and from the reader / writer 2 via a transmission / reception antenna 11; a tag control circuit 13 for controlling the entire tag A; A nonvolatile memory 14 composed of an EEPROM in which data of the tag A itself is stored.

The other tags B to E have the same configuration as the tag A.

Next, a process of reading data of the tags A to E and transmitting the data to the host device 1 by the wireless tag system according to the embodiment of the present invention will be described with reference to FIGS.

First, when the wireless tag system is started, a start command (shown by (1) in FIG. 3) is wirelessly transmitted from the reader / writer (R / W) 2 to each of the tags A to E (step S1). S1). Thereby, each tag A
Response signals including data stored in the nonvolatile memory 14 are transmitted (replyed) wirelessly to the reader / writer 2 in time order as shown in FIG.
2).

The reader / writer 2 receives the response signal including the data from each of the tags A to E, and reads the data by the control circuit 4. At this time, as shown in FIG. , A response signal including data from the host device 1 is received, the data is read by the control circuit 4, and the read data is transmitted to the host device 1 (Step S).
3).

Similarly, as shown in FIG. 3, the reader / writer 2 receives the response signal including the data from the tag C transmitted second, reads the data by the control circuit 4, and reads the read data. The data is transmitted to the host device 1 (step S3). The host device 1 displays the transmitted data on the display device 3 as needed.

Similarly, as shown in FIG. 3, the reader / writer 2 receives the response signal including the data transmitted from the tag E transmitted fourth, reads the data by the control circuit 4, and reads the read data. The data is transmitted to the host device 1 (step S3). The host device 1 displays the transmitted data on the display device 3 as needed.

In the example shown in FIG. 3, since the response signals including the data from the tags B and D collide (the reader / writer 2 receives them at the same time), they cannot be read accurately. Is not executed at this stage.

When such a collision of response signals including data from the tags B and D occurs, the reader / writer 2 issues a sleep command to the tags A, C and D from which data can be read accurately. Feeding (indicated by (4) in FIG. 3),
Retransmission of data from tags A, C, and E is prohibited. Then, the reader / writer 2 transmits the start command again to all the tags.

As a result, response signals including data are transmitted again from the tags B and D, and the reader / writer 2
The response signal including the data from the tag B is received, the data is read by the control circuit 4, and the read data is transmitted to the host device 1 (step S3). The host device 1 displays the transmitted data on the display device 3 as needed. Next, the reader / writer 2 receives the response signal including the data from the tag D, reads the data by the control circuit 4, and transmits the read data to the host device 1. The host device 1 displays the transmitted data on the display device 3 as needed.

Such processing is sequentially performed on the data of all the tags A to E, and the processing ends when there is no response signal (step S4).

As described above, the reader / writer 2 transmits the data to the host device 1 every time data is received from the tags A to E, and thus the data is stored in the screen of the display device 3, for example, in the tags A to E. Since the prices of the products are displayed sequentially, the operator can execute the processing efficiently.
In addition, the waiting time for the first display is shortened, and the response of the wireless tag system is felt quickly by the operator, and it is easy to confirm that the wireless tag system is operating.

Next, with reference to FIGS. 5 and 6, another example of reading data of tags A to D and transmitting data to the host device 1 by the wireless tag system according to the embodiment of the present invention will be described.

The examples shown in FIGS. 5 and 6 are basically the same as the examples shown in FIGS. 3 and 4, except that a plurality of read data from the tags A to E are collectively read. This is transmitted to the host device 1.

First, when the wireless tag system is started, a start command (indicated by (1) in FIG. 5) is wirelessly transmitted from the reader / writer (R / W) 2 to each of the tags A to E (step). S11). As a result, response signals including the data stored in the nonvolatile memory 14 are wirelessly transmitted (replyed) from the tags A to D to the reader / writer 2 in time order as shown in FIG. 5 (step S1).
2).

The reader / writer 2 receives the response signal including the data from each of the tags A to E, and reads the data by the control circuit 4 (step S13).

At this time, the reader / writer 2 checks whether there is a collision of data from the tags A to E (step S).
14) If there is no data collision, data is read from the received tag A to EK response signals and transmitted collectively to the host device 1 (step S15). The host device 1
The transmitted data is collectively displayed on the display device 3 as necessary.

On the other hand, in the example shown in FIG.
If the response signal including the data from the tag A has collided (the reader / writer 2 has received simultaneously) (step S14), the data is read from the response signal of the tag A received first, and the tag C received second. The data is read from the response signal of the tag E, and the data is read from the response signal of the tag E received fourth, and these are collectively transmitted to the host device 1 (step S16). Also, the response signals received from the tags B and D cannot be read accurately due to the collision, and the host device 1 of the data on the tags B and D does not read the response signals.
Is not performed at this stage.

When such a collision of response signals containing data from the tags B and D occurs, the reader / writer 2 issues a sleep command to the tags A, C and E from which data has been correctly read. Send (indicated by (4) in FIG. 5)
(Step S17, retransmission of data from the tags A, C, and E is prohibited.
Sends a start command again to all tags.

As a result, response signals including data are transmitted again from the tags B and D, and the reader / writer 2
Response signals including data from the tags B and D are received, and the control circuit 4 reads the data. Next, the reader / writer 2 checks whether or not there is another response signal (step S13). If there is no other response signal, the reader / writer 2 collectively reads the data from the tags B and D and reads the data from the host device 1. (Step S15). The host device 1 collectively displays the transmitted data on the display device 3 as necessary.

As described above, when a part of the data among the tags A to E is received, the reader / writer 2
By transmitting the data, the prices of the commodities stored in the tags A, C, and E, for example, are sequentially displayed on the screen of the display device 3, so that the operator can execute the processing efficiently.

Next, with reference to FIG. 7 and FIG. 8, still another example of the process of reading the data of the tags A to D and transmitting the data to the host device 1 by the wireless tag system according to the embodiment of the present invention will be described. .

The examples shown in FIGS. 7 and 8 are basically the same as the examples shown in FIGS. 3 and 4, but the polling signal from the host device 1 (shown by (6) in FIG. 7). Thus, each data in the reader / writer 2 is transmitted to the host device 1.

That is, first, when the wireless tag system is started, each tag A to D is transmitted from the reader / writer (R / W) 2.
Is transmitted wirelessly (indicated by (1) in FIG. 7) (step S21). As a result, response signals including the data stored in the nonvolatile memory 14 are wirelessly transmitted (replyed) from the tags A to D to the reader / writer 2 in the order of time as shown in FIG. 7 (step S22).

The reader / writer 2 receives a response signal including data from each of the tags A to D, and reads the data by the control circuit 4. In the example shown in FIG.
Read the data. In the example shown in FIG. 7, data of the tags B and D has a collision.

At this stage, when the first polling signal is transmitted from the host device 1 to the reader / writer 2 (indicated by (6) in FIG. 7) (step S23), the tags A and C have already been transmitted. Is completed, the reader / writer 2 transmits the data of the tag A and the tag C to the host device 1 (step S24). On the other hand, the response signals received from the tags B and D cannot be read accurately due to the collision, and are not transmitted to the host device 1. The reading of the data of the tag E has not been completed yet.

Next, when the data reading of the tag E is completed, the reader / writer 2 sends a sleep command to the tags A, C and E (indicated by (4) in FIG. 7) (step S25). , Tag A, tag C, and tag E are prohibited from being retransmitted, and reader / writer 2
Sends a start command again to all tags.

As a result, response signals including data are transmitted again from the tags B and D.

When the response signal is transmitted from the tags B and D, when the second polling signal is transmitted from the host device 1 to the reader / writer 2, the reading of the data of the tag E has already been completed. Reader / writer 2
Transmits the data of the tag E to the host device 1.

Finally, when the polling signal is transmitted from the host device 1 to the reader / writer 2 for the third time, the communication with all the tags has been completed.
The data of the tag D is transmitted to the host device.

Such a process is executed for all the data of the tags A to E, and the process ends when there is no response signal (step S25).

In this way, even if the host device-to-reader / writer 2 is one-to-many, data is not sent from a plurality of reader / writers 2 to the host device at once, and the reader / writer 2 This eliminates the need to newly provide a buffer for storing data.

[0066]

According to the present invention, the transmission of read data from the wireless tag to the host device is facilitated and speeded up.
It is possible to provide a wireless data transmission processing system and a wireless data transmission processing device capable of improving the overall operation rate.

Further, according to the present invention, regardless of the number, the transmission of read data from a plurality of wireless tags to the host device is facilitated and speeded up, thereby improving the overall operation rate. A wireless tag system and a wireless tag processing device that can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a wireless tag system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a detailed configuration of a reader / writer and a tag in the wireless tag system according to the embodiment of the present invention.

FIG. 3 is a flowchart showing a process of reading tag data and transmitting the data to a host device according to the embodiment.

FIG. 4 is an explanatory diagram showing a process of reading tag data and transmitting the data to a host device according to the embodiment;

FIG. 5 is a flowchart illustrating another example of processing for reading tag data and transmitting the data to a host device according to the present embodiment.

FIG. 6 is an explanatory diagram showing another example of processing for reading tag data and transmitting the data to a host device according to the present embodiment.

FIG. 7 is a flowchart illustrating still another example of a process of reading tag data and transmitting the data to a host device according to the present embodiment.

FIG. 8 is an explanatory diagram showing still another example of a process of reading tag data and transmitting the data to a host device according to the present embodiment.

FIG. 9 is an explanatory diagram showing a data transmission process in a conventional wireless tag system.

[Explanation of symbols]

 Reference Signs List 1 host device 2 reader / writer 3 display device 4 control circuit 5 transmitting circuit 6 transmitting antenna 7 data receiving circuit 8 receiving antenna 11 transmitting / receiving antenna 12 modulation / demodulation circuit 13 tag control circuit 14 nonvolatile memory A tag B tag C tag D tag E Tag F Tag

Claims (10)

[Claims] 1. A wireless data transmission processing system for wirelessly reading data from a plurality of wireless data transmission media by wireless data processing means and transmitting the plurality of read data to a host device. Transmitting the read data read from each wireless data transmission medium from the wireless data processing means to the host device every time data is read from the wireless data transmission means, and performing the data read from all the wireless data transmission media until the completion of the data reading; Wireless data transmission processing system. 2. A wireless data transmission processing system for wirelessly reading data of a plurality of wireless data transmission media by wireless data processing means and transmitting the plurality of read data to a host device. When reading each data of the data transmission medium wirelessly, it is checked whether there is a collision of the read data. If there is no collision of the read data, all the read data is transmitted to the host device, and the collision of the read data is performed. If so, it is necessary to transmit all the read data to the host device, and to re-read the data from the wireless data transmission medium in which the data collision has occurred, and transmit each data by re-reading to the host device. Characteristic wireless data transmission processing system. 3. A wireless data transmission processing system for wirelessly reading each data of a plurality of wireless data transmission media by wireless data processing means and transmitting the read plurality of data to a host device. When each data of the wireless data transmission medium is read wirelessly, each read data is transmitted to the host device before receiving the polling signal in response to the polling signal from the host device, and the data is still read. A wireless data transmission processing system for reading a wireless data transmission medium that has not been read. 4. A wireless data transmission processing system for wirelessly reading each data from a plurality of wireless data transmission media by a wireless data processing means and transmitting each read data to a host device. When each data of each wireless data transmission medium is read wirelessly, the presence or absence of collision of the read data is inspected, a polling signal is periodically transmitted from the host device to the wireless data processing means, and the time until the polling signal is received. The read data is transmitted to the host device without collision of the data already read in the meantime, and if there is a collision of the read data, the data from the wireless data transmission medium in which the data collision occurred is reproduced by the wireless data processing means. A subsequent poll that is read and periodically transmitted from the host device to the wireless data processing means. A wireless data transmission processing system for transmitting data to a host device by re-reading according to a communication signal. 5. Wireless data for transmitting a plurality of read data to a host device which performs overall control and collects data by wirelessly communicating with a plurality of wireless data transmission media each of which wirelessly transmits data. In the transmission processing device, receiving means for reading data from the plurality of wireless data transmission media under the control of the host device, and a wireless device for sequentially transmitting the read data from the plurality of wireless data transmission media to the host device in reading order. A wireless data transmission processing device comprising data processing means. 6. A wireless tag system that wirelessly reads each data from a plurality of wireless tags by a reader / writer and transmits each read data to a host device, wherein each wireless data is transmitted from the reader / writer to the host device. A wireless tag system which sequentially transmits each read data from a tag until reading of data from all wireless tags is completed. 7. A wireless tag system which wirelessly reads each data from a plurality of wireless tags by a reader / writer and transmits each read data to a host device, wherein each data from each wireless tag is read by the reader / writer. In addition to performing wireless reading of the data, it checks for collision of read data. If there is no collision of read data, all read data is transmitted to the host device. If there is collision of read data, it is read. All data to the host device, and after transmitting a sleep command from the reader / writer to each wireless tag, re-read data from the wireless tag in which data collision has occurred, and transfer each data by re-reading to the host device. A wireless tag system characterized by transmitting data. 8. A wireless tag system that wirelessly reads each data from a plurality of wireless tags by a reader / writer and transmits each read data to a host device, wherein each data from each wireless tag is read by the reader / writer. Wireless tag reading, and transmitting each read data to the host device in response to a polling signal from the host device. 9. A wireless tag system that wirelessly reads each data from a plurality of wireless tags by a reader / writer and transmits each read data to a host device, wherein each data from each wireless tag is read by the reader / writer. In addition to performing wireless reading of the data, inspecting the presence or absence of collision of read data, periodically transmitting a polling signal from the host device to the reader / writer, and reading the data without collision according to the polling signal by the reader / writer. The transmission to the host device is performed. If there is a collision of the read data, the sleep command is transmitted from the reader / writer to each wireless tag, and then the data is re-read from the wireless tag in which the data collision has occurred. Re-read in response to the subsequent polling signal that is periodically transmitted from to the reader / writer RFID system and performs the transmission of data of the host device F by. 10. A host device that performs overall control and collects data, a plurality of wireless tags each transmitting data wirelessly, and wireless data from the plurality of wireless tags under the control of the host device. And a reader / writer that sequentially reads the data from the plurality of read wireless tags to the host device in the order of reading.