JPH07104819B2 - ID system data writing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention is based on the control of a host computer, for example, a first device such as an ID controller, and an EE.
Transmits data to or reads data from a second device, which is a data carrier that includes a memory such as a PROM
Data writing method of ID (identification) system.

(B) Conventional technology In recent years, for example, as an ID system for identifying the types of articles, tools, etc. that are transported on a conveyor, parts and tools are provided with data carrier elements including memory. A device in which specific data is written in a memory from a controller or vice versa is being studied. EE / PROM is used as the memory of this data carrier.

In this ID system, when writing data from the ID controller to the EE / PROM which is the memory of the data carrier,
Normally, EEK / PROM has a structure in which 8 bytes make up one page.
When writing data, you can only write in page units. In other words, in the conventional ID system, the data carrier has a separate 8-byte (1 page) RAM area,
When writing data, once move the page contents of the EE / PROM to be written to the RAM area, rewrite only the part that requires data rewriting (example: 1-byte data) in the RAM area, and then R
The contents of the AM area are collectively written to the EE / PROM.

(C) Problems to be solved by the invention However, in general, there is a limit to the number of times that the EE / PROM can be written. When it occurs, there is a problem that the reliability of the data of the page becomes low and the destroyed original write data cannot be reproduced.

In addition, if the data in the address area of the EE / PROM that has been written 10,000 times is destroyed and cannot be used, the entire EE / PROM cannot be used and the life of the data carrier ends there. there were.

In view of the above, the present invention can confirm whether or not the memory such as the EE / PROM of the second device has been correctly written, and if the memory cannot be correctly written, the original data is restored and rewritten. The purpose of the present invention is to provide a data writing method for an ID system that enables effective use of memory such as EE / PROM, etc.

(D) Means and Actions for Solving Problems The data writing method of the ID system of the present invention is such that the data to be written is transmitted from the first device (ID controller) via the transmission medium to the second device (data). An electrically readable / writable memory (EE.
In the method of writing to the PROM), when the first device receives a write command from the upper side, it creates a read command with the same address as this write command and sends it to the second device, and rewrites the memory containing that address. Data corresponding to a unit is read from the memory and stored in the temporary storage means in the first device, and subsequently, a write command at an address designated by the write command is sent to the second device and written in the memory, and thereafter, The first device also sends a read command to the second device, writes the data written this time from the memory, compares the data to be written before writing with the read data, and if a match is found, a normal write response is sent. If there is no match, the response indicating that is added with the data stored in the temporary storage means and returned.

In this ID system, when a write command is input from the upper side, in the first device, first, the corresponding data corresponding to the rewriting unit (one page) including the address of the write command is transferred to the data carrier, that is, the second data. It is read from the memory of the device and temporarily stored in the internal buffer. After the temporary storage, writing of the data attached to the write command is performed in the memory area and a write response is received from the second device. Upon receiving the write response, the first device further issues a read command for the same address and reads the data written this time from the memory. Then, the write data stored before writing is compared with the data read this time, and if a match is found, writing is OK.
A normal write response is sent to the upper side, and if no match is obtained, the data corresponding to the rewriting unit read and stored in the temporary storage means is sent to the write response.

In the ID writing method of this ID system, even if writing is not successful, the write response indicating that fact and the restored data are sent back with it, so the upper side addresses the area of another data carrier. Then, it becomes possible to reconfirm the new data.

(E) Examples Hereinafter, the present invention will be described in more detail with reference to Examples.

FIG. 2 is a block diagram of an ID system showing an embodiment of the present invention.

This ID system includes an ID controller 10, a read / write head unit 10a connected to the ID controller 10,
Power is supplied electromagnetically through the read / write head unit 10a, and data transfer is performed by a data carrier 20 that is also electromagnetically supplied.

The ID controller 10 includes a CPU 11, a program memory 12, a RAM 13 for temporarily storing data, a timer 14 for measuring time, and a host transmission unit 1 for connecting to a host computer.
5. The lower side data carrier 20 is provided with a lower side modulation / demodulation circuit 16 for transmitting and receiving commands, data and the like, a display lamp 17 for operation display, and the like. This ID controller
Reference numeral 10 denotes a controller that receives a command from a host computer, converts it into a command that can be transmitted to a data carrier 20 that is a lower device, and performs control for converting data.

FIG. 3 is a block diagram showing a specific configuration of the data carrier 20. The data carrier 20 is a modulation / demodulation circuit 21 coupled to the read / write head unit 10a of the ID controller 10.
A decoding circuit 22, which combines the transmission signals from the modulation / demodulation circuit 21,
Serial input circuit 23, command decoder 24 for decoding input command, data buffer 25, and EE / PROM to which data to be stored is written or read
26, and comprises a serial output circuit 27, an encoding circuit 28, etc. used when reading data from the EE / PROM 26. Each circuit unit that constitutes the data carrier 20 is logically configured by combining various gates. EE / PR
Various data are written in and read from the OM26 for each page with 8 bytes per page. Data carrier 20
Is not configured to have a built-in power supply circuit, and is configured so that electric power is electromagnetically and contactlessly supplied from the ID controller 10 through the modulation / demodulation circuit 21.

FIG. 4 is an external view of the ID system of the embodiment.
The write head unit 10a and the ID controller 10 are connected to the lead wire 10b.
Data carrier 20 is one chip while coupled by
Formed by the IC, as described above, it is attached to the articles and tools transferred on the conveyor, under the control of the ID controller 10 in the process of conveying these articles and tools, Write data to the data carrier 20 via the read / write head unit 10a, or
Data from 20 via read / write head 10a ID
The controller 10 is configured so that it can be read by the host device.

Next, the write operation in this ID system will be described with reference to the flow chart shown in FIG. In the following writing, a case where a write command is independently input to the ID controller from the upper side will be described.

In FIG. 1, the left column shows commands from the host computer, the middle column shows the processing of the ID controller, and the right column shows the processing of the data carrier.

First, when a write command is input from the host device to the ID controller [step (hereinafter referred to as ST) 1], the write data corresponding to the address is temporarily stored in the ID controller, and the write data is included. A read command is sent from the ID controller 10 to the data carrier 20 side for 8 bytes of the same page (ST3), whereby the data carrier 20 side reads the data of the corresponding page (ST4), and the read data Is added to the read response and the read response is sent to the ID controller 10 side (ST5). On the ID controller 10 side, the data included in this read response is temporarily buffered, that is, 8 bytes of data is stored and held in RAM 13 as the data before writing (ST6), and at the same time, the specified amount, that is, the upper side Write command corresponding to the write command address (composed of command code, start address, and write data)
Send to 20 side (ST7).

The data carrier 20 receives this write command and writes the data of the corresponding portion (ST8). On the data carrier 20 side, when the writing of data is completed, a write response is sent to the ID controller 10 side (ST9). When this write response is received, the ID controller 10 side sends a read command again to the data carrier 20 side for the same address (ST10), and the data carrier 20 side receives this read command and responds, that is, this time Data is read (ST11), and this read data is
It is attached to the read response and returned (ST12). And
On the ID controller 10 side, the previously stored data before writing is compared with the data returned as a read response (ST13). As a result of the comparison, if a match is found, writing is OK and a normal write response is returned to the upper side (ST14). On the other hand, if no match is found, the write response indicating this is read in ST6 in advance. The stored data before writing is added and returned as the restored data to the upper side (ST15). Upon receiving this write response, the upper side can perform appropriate processing such as attaching a write command to another address of the data carrier using the restored data.

The writing method of this embodiment ID system is not a case where the command from the upper side is continuously input with a read command and a write command in pairs, but with a write command alone,
Effective when continuous.

In the ID system of this embodiment, the data carrier can be realized by adding a very simple logic by adding the read command in advance. Moreover, it is practical because it does not cause a time delay with respect to the write processing.

(F) Effect of the Invention According to the present invention, even when the write data sent from the first device is not correctly written, the write data for the same page is read in advance before writing, and the data before writing is first written. Since it is temporarily stored in the device side of No. 1, it is possible to check the comparison between the read data and the data before writing, and if the data is not written correctly, add the data before writing to the write response and restore it. Since it is transmitted, the upper side can use the data again to rewrite to an address of a different memory, and therefore, it is possible to improve the data writing reliability and effectively use the memory. There are advantages.

[Brief description of drawings]

FIG. 1 is a flow chart for explaining the operation of an ID controller according to an embodiment of the present invention, FIG. 2 is a block diagram of an ID system showing an embodiment of the present invention, and FIG. 3 is the same ID system. FIG. 4 is a block diagram of the data carrier of FIG. 4, and FIG. 4 is a schematic external perspective view of the ID system. 10: ID controller, 10a: read / write head section, 11: CPU of ID controller, 13: RAM, 20: data carrier.

Claims (1)

[Claims] 1. ID system data in which data to be written is transmitted from a first device to a second device via a transmission medium and is written in an electrically readable / writable memory provided in the second device. In the write system, when the first device receives a write command from the upper side, it creates a read command with the same address as this write command and sends it to the second device, which corresponds to the rewriting unit of the memory including the address. Minute data is read from the memory and stored in the temporary storage means in the first device, and subsequently, the write command at the address specified by the write command is sent to the second device and written in the memory, and thereafter. , Send a read command from the first device to the second device, read the data written this time from the memory, and compare the data to be written before writing with the read data. , Matching a normal write response as long obtained, if a match is obtained, so as to output the designated data stored in the temporary storage means to the response indicating that the ID
System data writing method.