JPH02100526A - Individual identification method - Google Patents

Abstract

PURPOSE:To unequivocally set the content of a memory even if the content of the memory is indefinite due to the raise time of power by giving a function setting a check code in an accurate code when there is the check code for detecting the abnormality of internal data in a slave station. CONSTITUTION:When the slave station 1 receives data to be written from a master station 1, it checks whether there is a communication error. When it is normal, data is written in a memory 1 (12A), a memory 2 (12B) and a memory 3 (12C) in triple. When the slave station receives command transmission from the master station, it majority-decides the memories 1, 2 and 3. When the content of the memory is indefinite due to the raise time of power, there is hardly any probability that the contents of the memory 1 (12A), the memory 2 (12B) and the memory 3 (12C) coincide. Here, initial reset is performed and it is attained by using a full memory clear command.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention enables a master station to read out the memory contents of a slave station attached to each individual without contact, thereby identifying the individual and identifying information that the individual carries. It relates to an individual identification method for recognition.

[Conventional technology]

Memory abnormalities in conventional individual identification occur when communication fails when the master station writes data to the slave station.
Even though the data in memory is abnormal,
This often occurs when a moving object to which the slave station is attached moves out of the communication area of the master station, making the data abnormality in the slave station irreparable. and,
If an abnormality occurs, the slave station sets an abnormality flag when writing data, and notifies the master station of this at the same time as another master station requests continuous output.

[Problem to be solved by the invention]

Individuals with slave stations attached often move;
Therefore, in some cases, the slave station may be placed in an extremely harsh environment, and the data in the slave station may be destroyed, but the data error flag of the slave station indicates that the data written previously If it is successful, it is normal, so there is a drawback that the master station cannot detect data corruption from the abnormality flag. For this reason, the master station must check whether there are any abnormalities in the data from the slave station, which poses problems in that the system including the master station becomes complicated and the processing takes time.

Therefore, the applicant has provided the slave station with a means for checking its own data area, and each time the slave station receives a data read request from the master station, it checks the data to detect an abnormality and sends the results to the master station. proposed an individual identification method that can detect data destruction that occurs while a slave station is moving (Japanese Patent Application No. 18354-1982).
6.See No. 183547).

However, with this type of individual identification method, if you try to communicate when the memory contents in the slave station are undefined, such as when the slave station turns on its power, the slave station will detect an abnormality in the data and the communication will not be normal. communication will no longer be established. Therefore, conventionally, when powering up the slave station, data is written from the master station to all data areas of the slave station as an initial process to ensure that there are no undefined areas in the data area of the slave station before use. Ta. Furthermore, when writing data from the master station to the data area of the slave station, it was necessary to transmit all the data from the master station equal to the amount of data to be written to the slave station. That is, if the slave station has a 100-byte memory and writes data to this entire area, the master station must always send 100 bytes of data. In other words,
This method is.

While there are advantages to filling the slave station's memory with arbitrary data, for example, when you want to clear the entire data area (writing ``0'') as in initial processing, it is not possible to fill the slave station's data memory with any data. The problem was that the master station had to send an amount of data equivalent to the amount of data, which was inefficient. In particular, if the amount of data memory in a slave station is increased to accommodate a more complex system, a large amount of time will be spent on initial processing, which is a problem.

Therefore, an object of the present invention is to enable the above-mentioned initial processing to be performed simply and in a short time.

[Means to solve the problem]

In order to solve the above problem, the slave station clears all its own memory area with the all memory clear command from the master station, and if there is a check code for detecting abnormality in internal data, it corrects it. The slave station fills all its own memory area with the data sent from the master station following the command by the function set to the code or the all memory set command from the master station, and also to detect abnormalities in internal data. If there is a check code, it has a function to set it to the correct code. Also,
The slave station has a memory data area abnormality check function,
It is also possible to notify the master station of the check result every time a data read request is received from the master station.

[Effect]

By providing the above functions, even if the slave station's internal memory becomes unstable when the power is turned on, etc., and the slave station's data error check fails and normal communication cannot be performed, the slave station's memory and error check code will be correctly updated. It is possible to set with one command, and the data is attached to that command only for all memory set commands, not for all memory clear commands.
Since it only takes one to several bytes at most, initial processing can be completed easily and in a short time.

〔Example〕

First, methods for detecting abnormalities in data in slave stations include, for example, adding horizontal and vertical parity and C codes to data and detecting all abnormalities based on these check codes, or storing multiple pieces of the same data in memory. Various methods can be considered, such as storing them in memory and making a majority decision to detect abnormalities. Here, an example will be described in which the same data is stored in triple memory in the slave station memory as the abnormality detection means and 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 body 3 is
For example, data such as an identification code is written by the master station 1. The moving object moves and reaches the three moving objects. Therefore, the master station IA reads the data of the two slave stations and identifies the mobile object.

FIG. 2 shows an example of the configuration of a slave station. The slave station is contactless communication device 1
10 receives a command from the master station, and in response to the command, cpull reads data from the memories 12A to 12G and transmits the data to the master station via the contactless communication device 10. For majority decision, the memory is memory 1 (1
2A), memory 2 (12B), memory 3 (12C)
It has been converted to fi. Memos IJ 1, 2, and 3 basically contain the same data unless there is an error.

The individual identification operation will be explained. First, data is written by the master station 1 to the slave station 2 at the location of the moving body 3 in FIG. The slave station 2 receives data to be written from the master station 1. The cpull in FIG. 2 checks these data for communication errors, and if normal, writes the data in triplicate to memory 1 (12A), memory 2 (12B), and memory 3 (12C). By this, memory 1
The same data is stored in ゜2.3.

In FIG. 1, when the mobile body moves to the position of the mobile body 3A, the master station IA reads data from the slave station 2A. The procedure is shown in Figure 3. When the slave station receives the command transmission (■) from the master station, it checks the logic of the command and the presence or absence of a communication error in the reception process (■). If this is correct, the CPU next performs a majority decision (2) on the memories 1, 2, and 3. While the CPU is making a majority decision, the slave station sends the leading signal■
Send. This is to ensure stable communication from the slave station to the master station, and to keep the receiving power of the contactless communication device of the master station in a marked state. In the majority decision, if all three agree, it is considered normal, and the matched data is sent in data transmission process O, and both the abnormal data flag and abnormal occurrence notification flag are considered normal, and the data is returned to the master station in abnormal flag transmission process ◎. Notify me of something. If only one of the three differs and the remaining two match, data that matches the two will be transmitted. Regarding abnormality notification, the abnormality data flag is set as normal, and the abnormality occurrence notification flag is notified to the master station as abnormality occurrence. In this case, the master station treats the data as normal. If all three are significantly different, the slave station transmits one of the three as a dummy in data transmission processing 0, and the abnormality notification is notified to the master station as both the abnormal data flag and the abnormal occurrence notification flag are abnormal. .

When an abnormality is detected in this way, if the memory contents of the slave station are uncertain, for example when the power is turned on, memory 1 (12A), memory 2 (12B), memory 3
There is almost no possibility that the existence of (12C) will match, and therefore, in this state, both the abnormality data 7 lag and the abnormality occurrence notification flag become abnormal, making it impossible to perform normal communication. Therefore, an initial reset is performed using an all memory clear command.

FIG. 4 shows the procedure for clearing all memory. When the slave station receives the all-memory clear command from the master station, it first performs an ACK transmission process [phase] to inform the master station that it has indeed accepted the all-memory clear command. Thereafter, the slave station performs all data area clear processing [phase] to clear its own data area. At this time, as in this embodiment, data abnormality detection is based on majority decision, and if there is no check code for abnormality detection, only the data area is cleared. If you are using a method that adds parity etc. and detects abnormalities based on those check codes, be sure to calculate those check codes on the slave station side and set a check code that represents the result. do.

Next, a memory set using the all memory set command will be explained. Figure 5 shows the implementation procedure.

This is basically the same as the all memory clear command, but the difference is that the master station sends data [phase] following the command transmission [phase]. Slave station receives data [phase]
If the commands and data have been successfully executed without error, the ACK transmission [phase] is performed in order to notify all master stations that the command and data have been received, and then all data area set processing is performed. In this process, the slave station fills its entire memory with data received from the master station, and if there is a check code for abnormality detection, calculates the check code and sends it to its cell l-'.

FIG. 6 shows the relationship between the data transmitted from the master station and how the memory of the slave station is filled in all memory sets. The transmission text @ from the master station is a command @ followed by data ■ as shown in FIG. Basically, the length of the data can be any length, but it is usually 1 to several bytes.

In this example, assume that the data ■ is written there. When the entire memory set is specified by the command @, the slave station fills the slave station data memory with the contents of the subsequently sent data. If the data sent is 1 byte, the slave station data memory is filled with that 1 byte, and if the data is several bytes, the slave station data memory is filled with repetition of the several bytes. In the example of FIG. 6, the data is 3-byte data such as ``■'', so the slave station data memory is filled with repeated 3-byte data ``■''. The convenience of the full memory set is that, for example, when the system handles data with 2ASC1i codes, the memory can be stored in a hood with a predetermined meaning "00" [
There are cases where it is better to fill in the space code 20 (H) than to fill it with H), and it is useful in such cases.

〔Effect of the invention〕

According to the present invention, even when the memory contents of the slave station of the individual identification device are undefined due to power-on, etc., the memory contents 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 contents are undefined. Moreover, when performing the initial processing, the master station only needs to send a command when all memories are cleared, and a command and one to several bytes of data when all memories are set, increasing communication efficiency. In addition, as shown in Figures 4 and 5, the master station does not need to be involved in the process after receiving the ACK, and can engage in other work during the process. It also improves efficiency.

Furthermore, when the slave station is used, for example, on a factory line, the slave station can be attached to a certain individual to do work, and after the job is finished, the slave station is retrieved and attached to another individual to do the work again. Even in such a case, unnecessary data of the following 11J can be easily wiped out, which is useful for improving the rotation rate (usage rate) of the slave station.

[Brief explanation 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 an example of the configuration of a slave station, and Fig. 3 is a time chart for explaining the 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 a time chart for explaining the all memory set operation. FIG. 3 is an explanatory diagram for explaining the relationship with a slave station memory. Code explanation 1. 1 person...master station, 2,2A...slave station, 3,3A...mobile, 4,4A...
Controller, 10... Non-contact communication device, 11=...=
cpu, 12A, 12B. 12C...Memory. Agent Patent Attorney Akio Namiki Agent Patent Attorney Kiyoshi Matsuzaki Figure 2 Figure 4I! 6 Palace

Claims (1)

[Scope of Claims] 1) A master station having at least a non-contact communication means contactlessly reads out the memory contents of a slave station that has an internal memory and a non-contact communication means and is attached to a mobile object to identify an individual. In doing so, when the slave station receives a memory clear command from the master station, it clears all its own memory areas, and if there is a check code for detecting abnormalities in internal data, it sets it to the correct code. , When receiving a memory set command from the master station, it uses the data accompanying the command to fill all its own memory areas with that data pattern, and if there is a check code for detecting abnormalities in internal data, it uses it. An individual identification method characterized by setting the code to the correct code. 2) The individual identification system according to claim 1, wherein the slave station checks its own memory data area for abnormality every time it receives a data read request from the master station, and notifies the master station of the result. Method.