JPH04100338A - Check system for transmission data - Google Patents

Abstract

PURPOSE:To find out a transmission error by inputting a same nonreproducible data to a head record and a final record of a transmission data and comparing the head record and the final record at reception so as to confirm the coincidence. CONSTITUTION:When a data generating command is outputted from a reception means 20 to a transmission means 10, a host computer 1 latches a non- reproducible data such as a current date and extracts a designated data from a main memory 9 and writes it to a work memory 11. In this case, the non- reproducibility is written in the head record and the final record and a data transmission command is sent from the reception means 20 to activate a serial loop controller 3 and to send a data and the non-reproducible data written in the head record and the final record are compared at the reception means 20 and when they are dissident, it is discriminated to be a transmission error. Thus, when a fault takes place on the way of the transmission and a data of a prescribed number of items is not sent, the transmission error is found out.

Description

[Detailed Description of the Invention] [Summary] Regarding a check system for data transmission between electronic devices, a transmission error can be detected when a predetermined number of data is not transmitted due to a failure occurring during transmission. The purpose of the present invention is to provide a data checking system, and to provide a transmission means for transmitting data by adding the same non-recurrence data to the first and last records of transmitted data in data transmission between electronic devices. and receiving means for checking whether the non-reappearance data added to the records are the same.

[Industrial application field]

The present invention relates to a checking system for data transmission between electronic devices, and particularly to a checking system for transmitted data when transmitting data necessary for mounting components on a printed wiring board.

[Prior art]

Mounting bag W used when mounting components on printed wiring boards
(Mounter) includes the type of parts determined during the design process,
Data such as position and direction are required. The data to be held by this component mounting device is, for example, a necessary portion of a large amount of data stored in the main memory of a host computer, which is transmitted using a line.

FIG. 3 is a conceptual diagram showing a network for transmitting data from a host computer to a component mounting device. A host computer 1 equipped with a main memory 9 and a plurality of component mounting bags 22 connected in series in a loop shape (indicated by a in the drawing to distinguish each mounting device).

A transmitting means 10 is constituted by a serial loop controller 3 that controls transmission of the nets (with suffixes ``b...'').

Above, on the side of each component mounting device 2, there is a host combinator 1.
MPU 4 (in order to distinguish each MPU, suffixes a, b, etc. are given in the drawing). Memory 5 that stores data transmitted from the host computer 1 (indicated by a in the drawing to distinguish each memory)
, b, . . . ) are included in the receiving means 20.

FIG. 4 is a flow diagram showing the data transmission procedure in the network configured as described above. Based on the data creation instruction (FIG. 4, 511) from the operation board on the receiving means 10 side, the requested data is read from the main memory 9 of the host computer 1, and the data is stored in the work memory 11 attached to the host computer 1. Write it once (FIG. 4, FIL).

Here, in addition to converting the data into data compatible with the component mounting device 2, data processing is performed such as writing the total number of items in the first record of the data or assigning a serial number to each piece of data in order to check for transmission errors, which will be explained later. (Figure 4, F12). Once this data creation work is completed,
In order to notify the receiving means 20 of this, data is transmitted to the receiving means 20 via the serial loop controller 3 in response to a transmission instruction from the receiving means 20 (FIG. 4, 512), and the data is stored in the memory of the receiving side. It is stored in 5.

Receiving means 20 for receiving data transmitted in this manner
Now, the receiver needs to check whether the received data is correct or not. Therefore, if a total number is attached to the first record, the total number is compared with the number of data actually received to check whether there is a transmission error. Alternatively, if a serial number is attached to each data, the receiver checks whether the received data is correct by confirming that there are no omissions in the serial number (Fig. 4, F14 → F15 ).

In addition to the above method for checking transmission errors, there is also a method of adding the total number of items to the first record at the time of transmission, adding a serial number to each data, and checking both the total number of items and the serial number when receiving the data. be.

Furthermore, if the same data group is received twice, the receiver compares the two data groups and if they are the same, there is a high probability that there was no transmission error. In some cases, a check is performed using a so-called two-transmission method, which has a high probability of being incorrect.

Transmission data is checked not only when transmitting data via a line as described above, but also when transmitting data by passing files. FIG. 5 is a conceptual diagram of data transmission by file passing under multi-job O8. The host computer 1 is capable of performing multiple types of work, and the main memory 9 stores data necessary for the work or the results of the work. When a data transmission request is received from a lower-level job (for example, the printer 6), the requested data is written from the main memory 9 to the intermediate memory 8, where it is processed into data suitable for the printer 6, and then passed to the printer 6. It will be done. After the host computer 1 passes the data to the intermediate memory 8, it operates according to other work requirements and is not monopolized by the printer 6.

Even in data transmission by passing files like this,
From the host computer 1 side (referred to as foreground) to the intermediate memory 8 or from the intermediate memory 8 to the printer 6
In order to check whether data has been correctly transmitted to the background side (referred to as background), the above-mentioned checking method is used.

[Problem to be solved by the invention]

In the example shown in FIG. 4, when checking the serial number, the memory 5 of the receiving means 20 at the time of a certain data transmission,
For example, if 10 items of data have been transmitted and stored, but in the next data transmission, some kind of failure occurs while all 8 items of data are being transmitted, and only 3 items are received. Assume that In this case, within the memory 5, continuity is maintained between the serial number of newly transmitted data and the serial number of data remaining from the previous time, so no transmission error will be discovered by the method of checking the serial numbers.

Also, in the method of checking the total number or the method of checking the total number and checking the serial number, if the data transmitted last time was 10, and the total data to be transmitted is also 10, Even if up to three pieces of data are received due to the occurrence of some kind of failure, it is impossible to discover a transmission error.

In such a case, if the side receiving the transmission is the component mounting system W, 2 as described above, it is necessary to obtain the mounting data for one board, but the 4th item remaining from the previous time and onwards should be obtained. This data is inconvenient because it is not the data of the target board. Furthermore, although the transmission error checking method using the two-transmission method described above has a high probability of detecting transmission errors, it has the disadvantage that it takes time.

This invention has been proposed in view of the above-mentioned conventional circumstances, and is a check of transmitted data that can detect transmission errors when a predetermined number of data is not transmitted due to a failure occurring during transmission. The purpose is to provide a system.

[Means to solve the problem]

This invention employs the following means to achieve the above object. That is, in data transmission between electronic devices, the first record Rt and the last record R of the transmission data Ds
a transmitting means 10 that adds the same non-reoccurring data Dp to b and transmits the same; and a receiving device that checks whether the non-reoccurring data Dp added to the first record Rt and the last record Rb are the same. It is equipped with means 20.

[Effect]

The non-reproducible data Dp written in the first record Rt and the last record Rb with the above configuration are compared by the receiving means 20, and if they do not match, a transmission error is determined.

〔Example〕

FIG. 1 is a conceptual diagram showing the principle of the invention, and FIG. 2 is a flow diagram showing an embodiment of the invention. Although the device configuration itself is the same as the conventional configuration shown in FIG. 3, the operating procedure is different as follows.

When a data creation instruction is issued to the transmitting means 10 from the operation board of the receiving means 20 (FIG. 2, Sl), the host computer 1 first stores non-reoccurring data, such as the current date, in a predetermined built-in register 12. After that, the specified data is extracted from the main memory 10 and stored in the work memory 11.
(Figure 2, F1 → F2).

The data written in the work memory 11 in this way is processed to correspond to the MPU 4 of the receiving means 20, and when the data creation is completed, the receiving means 20 is notified of the completion of the creation (FIG. 2, F3- F4) Waiting for the completion of this creation, issue a data transmission instruction from the operation board of the receiving means 20 (FIG. 2, S2), activate the serial loop controller 3, and start data transmission (FIG. 2, F5). At this time, the date held in the register 12 is first read out, then the data from the work memory 11 is read out, and finally the date held in the register 12 is read out again in order. It is transmitted to the 20 side. As a result, the transmission data Ds shown in FIG. 1 is formed. In addition, the above data extraction and processing (F
When writing the data extracted in step 2→F4) to the work memory 11, the non-reappearance data Dp is written to the first record Rt and the last record Rb, and the contents of the work memory 11 are written at the time of transmission. may be read out sequentially.

On the receiving means 20 side, first, non-reoccurrence data (date data) D, which is the content of the first record Rt that is transmitted.
p is held in a register or the like (not shown), and data regarding the parts is stored in another large-capacity memory 5. and,
The first non-reoccurring data Dp held in the register as described above when the final record Rb was transmitted is compared with the final non-reoccurring data Dp (FIG. 1, F6
, F7, F8).

When both data match as a result of this comparison, it can be determined that no transmission error has occurred, and when both data do not match, it can be determined that a transmission error has occurred.

I have only explained data transmission using lines above, but
This invention can also be applied to data transmission by file passing under multi-job O8.

〔Effect of the invention〕

As explained above, in this invention, the same non-reoccurring data is included in the first record and the last record of the transmission data, and the first record and the last record are compared at the time of reception to confirm a match. A transmission error can be detected when a predetermined number of data items are not transmitted due to a failure occurring during transmission.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the principle of this invention, FIG. 2 is a flow diagram of an embodiment of the invention, FIG. 3 is a conceptual diagram of an example of a transmission system to which this invention is applied, and FIG. 4 is a conventional flow diagram. FIG. 5 is a conceptual diagram of file-passing data transmission. In the figure, Ds...transmission data, Rt...first record, Rh...last record, Dp...non-reappearance data, 10...transmission means, 20...reception means. Δ Δ

Claims (1)

[Claims] [1] In data transmission between electronic devices, the same non-recurrence data (Dp) is added to the first record (Rt) and the last record (Rb) of the transmission data (Ds) and then transmitted. a transmitting means (10) for transmitting data, and a first record (Rt
) and a receiving means (20) for checking whether or not the non-reoccurring data (Dp) added to the final record (Rb) are the same.