JPH0787425B2 - Individual identification method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention allows a master station to read out the memory contents of a slave station attached to each individual in a non-contact manner to identify an individual or to store information associated with the individual. The present invention relates to an individual identification method for performing recognition.

[Conventional technology]

The memory abnormality in the conventional individual identification is that communication fails when the master station writes data to the slave station,
Even though the data in the memory is abnormal,
This often occurs when the moving object to which the slave station is attached moves out of the communication area of the master station and the data abnormality of the slave station becomes unrecoverable. And
When an abnormality occurs, the slave station sets an abnormality flag at the time of writing data, and the master station always notifies it when a read request is made from the (other) master station.

[Problems to be Solved by the Invention]

Individuals with attached slave stations often move,
For this reason, the slave station may be placed in an extremely harsh environment in some cases, and the data in the slave station may be destroyed. If the writing is successful, it is normal, so the master station has the drawback that it cannot detect data corruption from the error flag. Therefore, the master station needs to check whether or not the data from the slave station is normal, which causes a problem that the system including the master station becomes complicated and the processing takes time.

Therefore, the applicant gives the slave station a means for checking its own data area, and whenever the slave station receives a data read request from the master station, the applicant performs an error detection by the data check and outputs the result to the master station. We have proposed an individual identification method that can detect the destruction of data that occurs while the slave station is moving by notifying the station (Japanese Patent Application No. 183546/18354).
(See No. 7).

However, in such an individual identification method, if communication is attempted when the content of the memory in the slave station is indefinite, such as when the power of the slave station is turned on, the data abnormality detection of the slave station may occur. Normal communication will not be established. Therefore, conventionally, when the power supply of the slave station is turned on, as initial processing, the data is written from the master station to the entire data area of the slave station so that there are no undefined points in the data area of the slave station before use. It was Further, when writing data from the master station to the data area of the slave station, it is necessary to transmit all the data equal to the amount of data written to the slave station from the master station. That is, when the slave station has a memory of 100 bytes and writes data in this entire area, the master station must send 100 bytes of data. In other words, this method has the advantage that it can be filled with arbitrary data in the slave station's memory, but even if you want to clear the entire data area (write "0"), such as in the initial processing,
The master station had to send as much data as the amount of data memory of the slave station, which was a drawback of inefficiency. In particular, if the data memory amount of the slave station is increased so as to cope with a more complicated system, a lot of time is spent on the initial processing, which is a problem.

Therefore, an object of the present invention is to enable the initial treatment as described above to be performed easily and in a short time.

[Means for Solving the Problems]

In order to solve the above-mentioned problem, each time a slave station receives a data read request from the master station, it performs an abnormal check of its own memory data area and sends the result to the master station. In this case, when receiving a memory clear command sent from the master station, it clears all its own memory areas, and if there is a check code for internal data abnormality detection, it sets it to the correct code. Or, by the all memory set command from the master station, the slave station fills all its own memory area with the data sent following the command from the master station, and the check code for abnormal detection of internal data is If so, have the ability to set it to the correct code.

[Action]

By providing the functions as described above, even if the internal memory of the slave station becomes unstable when the power is turned on and the data abnormal check of the slave station is triggered and normal communication cannot be performed, the memory in the slave station and the code for the abnormal check are stored. It is possible to set correctly with one command, and the data is added to that command only for all memory set commands, not for all memory set commands.
Also, since the number of bytes is at most 1 to several bytes, the initial process can be completed easily and in a short time.

〔Example〕

First, as a data abnormality detection method in the slave station, for example, horizontal and vertical parity or CRC code is added to the data and the abnormality is detected based on these check codes, or the same data is stored in multiple memories. Various methods are conceivable, such as a method of majority-judging them and detecting an abnormality. Here, an example will be described in which the same data is triple-stored in the slave station memory as abnormality detection means, and a data abnormality is detected by majority decision.

FIG. 1 is a schematic diagram showing an example of an individual identification system to which the present invention is applied. The slave station 2 attached to the mobile unit 3
Data such as an identification code is written by the master station 1. The moving body moves to the moving body 3A. Therefore, the master station 1A reads the data of the slave station 2A and identifies the moving body.

FIG. 2 shows a configuration example of the slave station. Slave station is a contactless communication device 10
In response to the command, the cpu 11 reads data from the memories 12A to 12C according to the command, and transmits the data to the master station via the non-contact communication device 10. The memory is memory 1 (12A), memory 2 (1
2B) and memory 3 (12C) are tripled. Memory 1,
Basically, the same data is written in 2 and 3 if there is no error.

The individual identification operation will be described. First, data writing is performed by the master station 1 with respect to the slave station 2 at the position of the mobile unit 3 in FIG. The slave station 2 receives the data to be written from the master station 1. The cpu11 in FIG. 2 checks if there is a communication error in these data, and if they are normal, the data is stored in memory 1 (12A), memory 2 (12B), memory 3 (12C).
Write in triple. As a result, the same data is stored in the memories 1, 2, and 3.

In FIG. 1, when the mobile unit moves to the position of the mobile unit 3A, the master station 1A reads data from the slave station 2A. The procedure is shown in FIG. When the slave station receives the command transmission from the master station, the reception process checks the command logic and the presence of communication error. If this is correct, the cpu will then
Make a 1,2,3 majority vote. While the cpu is making a majority decision, the slave station sends a reading signal. This is for stable communication from the slave station to the master station,
The reception output of the non-contact communication device of the master station is kept in the mark state. In the majority decision, if all three parties match, it is regarded as normal, and the matched data is transmitted in the data transmission process.
The abnormal data flag and the abnormality occurrence notification flag are both normal, and the abnormality flag transmission processing notifies the master station that the abnormality is normal. When only one of the three parties is different and the remaining two parties match, the data that matches the two parties is transmitted. Regarding the abnormality notification, the abnormality data flag is normal, and the abnormality occurrence notification flag notifies the master station that an abnormality has occurred. in this case,
The master station treats the data as normal. When the three are different from each other, the slave station transmits one of the three as a dummy in the data transmission process, and notifies the master station that the abnormality data flag and the abnormality occurrence notification flag are both abnormal.

When abnormality detection is performed in this way, if the memory content of the slave station is indefinite due to power-on, for example, the memory 1 (12A), memory 2 (12B), memory 3 (12
It is unlikely that the contents of C) match, and in this state, therefore, both the abnormal data flag and the abnormality occurrence notification flag become abnormal, and normal communication cannot be performed. Therefore, an initial reset is performed, which is performed by using the clear all memory command.

FIG. 4 shows the procedure for clearing all memories. When the slave station receives the command for clearing all memory from the master station, it first performs ACK transmission processing to notify the master station that it has surely accepted the clear memory command. After that, the slave station performs the entire data area clearing process to clear its own data area. At this time, as in this embodiment, the abnormality detection of the data is based on the majority decision, and when there is no check code for the abnormality detection, only the data area is cleared. When using a method to detect anomalies based on these check codes by adding parity etc.,
The check code is calculated on the side of the slave station and the check code representing the result is set.

Next, the memory set by the all memory set command will be described. FIG. 5 shows the implementation procedure.

Basically, it is the same as the case of the all memory clear command, but the difference is that the master station transmits data following the command transmission. When the slave station can execute data reception without error, it sends ACK to notify the master station of acceptance of the command and data, and then performs set processing on the entire data area. In this process, the slave station fills the entire memory with the data received from the master station, and if there is a check code for detecting an abnormality, calculates the check code and sets it.

FIG. 6 shows the relationship between the data transmitted from the master station and the way of filling the memories of the slave stations in all the memory sets. The text transmitted from the master station transmits data following the command as shown in FIG. The length of the data is basically arbitrary, but is usually 1 to several bytes. In this example, it is assumed that the data is written there. When all memory sets are specified by the command, the slave station fills the slave station data memory with the contents of the data sent subsequently. If the transmitted data is 1 byte, the slave station data memory is filled with the 1 byte data, and if the data is several bytes, the slave station data memory is filled with the repeated several bytes of data. In the example of FIG. 6, since the data is such 3-byte data, the slave station data memory is filled by repeating the 3-byte data. The advantage of all memory sets is that
For example, when the system handles data with ASII code, the memory has a code "00" [H] with a predetermined meaning.
There are cases where it is better to fill with space code 20 [H] than to fill with, and it is useful in such a case.

〔The invention's effect〕

According to the present invention, the data corruption of the memory, which is likely to occur when the slave station is placed in a harsh environment, can be checked every time a data read request is issued from the master station, and the data corruption of the memory can be detected. Even when the memory content of the slave station is indefinite, the memory content can be uniquely set. This is particularly effective as an initial reset when the slave station has a data abnormality detection function and normal communication cannot be performed if the memory content is indefinite. In addition, when performing the initial processing, the master station sends only commands for clearing all memory and commands for all memory sets
Only a few bytes of data need be sent, increasing the efficiency of communication. Further, as shown in FIGS. 4 and 5, the master station does not need to be involved in the process after receiving the ACK, as shown in FIGS. 4 and 5, and can engage in another job during that time. The processing efficiency is also improved.

Further, according to the present invention, for example, when the slave station is used in a factory line or the like, a certain individual is attached to work, and after the work is completed, the slave station is collected and attached to another individual to perform work again. Even in such a case, it is possible to easily wipe out the old unnecessary data, which is also useful for improving the rotation rate (usage rate) of the slave station.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of an individual identification system to which the present invention is applied, FIG. 2 is a block diagram showing a configuration example of a slave station, and FIG. 3 is a time chart for explaining a read operation of slave station data. , FIG. 4 is a time chart for explaining the all-memory clear operation, FIG. 5 is a time chart for explaining the all-memory set operation, and FIG. 6 is data transmitted from the master station during the all-memory set operation. FIG. 4 is an explanatory diagram for explaining a relationship between a slave station memory and a slave station memory. Code explanation 1,1A …… Parent station, 2,2A …… Slave station, 3,3A …… Mobile unit, 4,4A…
… Controller, 10 …… Non-contact communication device, 11 …… cpu, 12A, 12
B, 12C …… Memory.

Claims (1)

[Claims] 1. A master station having at least a non-contact type communication means, which has a memory and a non-contact type communication means therein, reads the memory contents of a slave station attached to a mobile body in a non-contact manner to identify an individual, Each time the slave station receives a data read request from the master station, it performs an abnormal check of its own memory data area and sends the result to the master station.If the abnormal check result is abnormal, it is sent from the master station. When it receives a memory clear command, it clears all its own memory areas, and if there is a check code for detecting an internal data error, sets it to the correct code and sends it from the master station. When a memory command is received, the data attached to the command is used to fill the entire memory area of its own with the data pattern, and the internal data Individual identification method characterized by setting it to the correct code when there is a check code for normal detection.