JPH06187515A - Communication system for mobile object recognition device - Google Patents

Abstract

PURPOSE:To correctly read and write the data to a data carrier for starting first the communication by reading out an ID code at first and then reading and writing the subsequent data in the designation of the ID code. CONSTITUTION:When a certain data carrier 2 enters a communication area, a reader/writer 1 transmits a command to the carrier 2 to read out an ID code. Thus the carrier 2 sends its own ID code back to the reader/writer 1. When the data on the carrier 2 are read out, a reading command consisting of the ID code, the address and the number of data of the carrier 2 is sent to the relevant carrier 2. The carrier 2 judges whether the ID code included in the received command is identical with its own ID code or not. If so, the carrier 2 sends the data back to the reader/writer 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system of a mobile body identification device composed of a data carrier and a reader / writer.

[0002]

2. Description of the Related Art As shown in FIG. 3, a mobile unit identification apparatus is composed of a reader / writer 1 and a data carrier 2, and when a data carrier 2 which is a mobile unit moves into a communication area, a reader / writer. Reference numeral 1 is for communicating with the data carrier 2 by a radio signal composed of a radio wave signal or an optical signal.

In the conventional mobile body identification device, data is read from and written to the data carrier 2 as follows. That is, when the reader / writer 1 reads data from the data carrier 2, the reader / writer 1 sends the read address and the number of data to the data carrier 2 together with the read command as shown in FIG. On the other hand, the data carrier 2 receiving this command sends back the designated data by a radio signal.

When the reader / writer 1 writes data to the data carrier 2, the reader / writer 1 sends the write address, the number of data, and the data to the data carrier 2 together with a write command. The data carrier 2 writes the designated data to the memory, and the reader / writer 1
Also sends back a notification of processing completion. When the number of data to be read and written is large, the above operation is repeated.

[0005]

By the way, the above-mentioned conventional
If there is a large amount of data to read or write, the mobile identification device
In this case, reading and writing are performed in multiple times, so it is shown in FIG.
As a data carrier 2 ₁Reading and writing to
Another data carrier 2 on the way₂Enters communication area A
If it comes, another data carrier 2₂To communicate with
There was a possibility that Data carrier 2₁Exchange
Data carrier 2 after starting communication₂Enters communication area A
Data carrier 2 for reader / writer 1₁Closer
If you come to Japan, the reader / writer 1 is the data carrier 2₂When
I started communicating, for example, while reading
If there is, the data contents of the first half will be₁De
Data, the latter half of the data is data carrier 2₂
It becomes the content of the data of. In the case of writing again
The data content of the first half is data carrier 2₁Write correctly on
Data carrier 2 is included in the second half₂only,
Or data carrier 2 ₁Two₂Written in both
There is a problem of being lost.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to identify a mobile unit capable of correctly reading and writing a data carrier which first started communication with a reader / writer. Providing a communication system for the device.

[0007]

In order to achieve the above-mentioned object, the present invention is used in a mobile unit identification apparatus comprising a reader / writer for communicating with a wireless signal to a data carrier moving in a communication area. And ID to the data carrier
When the reader / writer has a code and reads / writes data from / to the data carrier, the reader / writer reads the ID code of the data carrier.
I read and write data after the code is read.
The feature is that it is performed by designating a D code.

[0008]

According to the structure of the present invention, the ID code is first read, and the subsequent reading and writing of data is performed by designating the ID code. Therefore, even when another data carrier enters the communication area. It is possible to read and write correctly to the data carrier that first started communication.

[0009]

EXAMPLES The present invention will be described below with reference to examples. First, in the embodiment system of the present invention, the moving body identification device is set to the reader / writer 1.
Each of the data carriers 2 configured together has an ID code, and the reader / writer 1 reads / writes data from / to the data carrier 2 based on the ID code.

That is, when a certain data carrier 2 enters the communication area A, the reader / writer 1 transmits a command for reading an ID code to the data carrier 2 as shown in FIG. In response, the data carrier 2 sends back its own ID code to the reader / writer 1. Then, when reading the data of the data carrier 2, a read command including the ID code, address, and number of data of the data carrier 2 is sent to the data carrier 2. The data carrier 2 judges whether the ID code in the received command is its own ID code according to the processing flow shown in FIG. 2, and the received ID code and its own ID
The data carrier 2 having the same code will send the data back to the reader / writer 1. When writing data to the data carrier 2, first, a command for reading the ID code is transmitted to the data carrier 2, and the ID code is sent back from the data carrier 2. After that, the reader / writer 1 sends a write command consisting of an ID code, an address and the number of data to the data carrier 2 to the data carrier 2. When the data carrier 2 determines that the ID code in the command matches its own ID command, the data carrier 2 writes the received data in the memory, and after completion of this writing, sends a notification of processing completion to the reader / writer 1.

As in the case of FIG. 4, the data carrier 2 _{1 first} enters the communication area A, and another data carrier 2 ₁ and the reader / writer 1 communicate with each other while another data carrier 2 ₁ enters the communication area A. When the data carrier 2 ₂ comes in, the data carrier 2 ₂ also receives the signal from the reader / writer 1, but in the data carrier 2 ₂ , the ID code in the received command does not match its own command, so the command processing Do not do. In other words, erroneous data reading and writing will not be performed.

[0012]

INDUSTRIAL APPLICABILITY The present invention is used in a mobile body identifying apparatus composed of a reader / writer which communicates with a data carrier moving in a communication area by a radio signal, and the data carrier is provided with an ID code so that the reader / writer When the reader / writer reads and writes data to the data carrier, the reader / writer reads the ID code of the data carrier,
Since the subsequent reading and writing of data is performed by specifying the ID code, even if another data carrier enters the communication area, it is possible to correctly read and write to the data carrier that first started communication. effective.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a communication state according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the above data carrier.

FIG. 3 is an operation explanatory diagram of the above.

FIG. 4 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 reader / writer 2 data carrier

Claims (1)

[Claims] 1. A mobile body identification device comprising a reader / writer for communicating with a wireless signal to a data carrier moving within a communication area, wherein the data carrier has an ID code, and the reader / writer makes the data carrier. When reading and writing data, the reader / writer reads the ID code of the data carrier, and the reading and writing of data after the reading of the ID code is performed by designating the ID code. Device communication method.