JPH02126351A - Data transfer control method - Google Patents

Abstract

PURPOSE:To quickly transfer the large quantity of data with the same communication line without interrupting the transfer of the comparatively short data used for the ordinary work by transferring the large quantity of the data for unit quantity data at the constant data transfer interval. CONSTITUTION:When data are accumulated at a terminal 20 and a data transfer request occurs in large quantities, the terminal 20 outputs a starting request signal (SIG) to a control device 10 and the device 10 outputs a starting answer signal (SIG) to the terminal 20. Next, at the terminal 20, the large quantity of the data to be transferred beforehand are divided into plural unit quantity data, the unit quantity data are transferred to a host 1 for one time and from a host 1, a response (receiving response) is returned. When the data of the one unit quantity are completed, the terminal 20 stops the transfer, the time is counted by a timer, the unit quantity data are transferred to the host 1 again after the prescribed time, the response is returned from the host 1 and this is repeated. Thus, without interrupting the transfer of the comparatively short data used for the ordinary work, the large quantity of the data can be quickly transferred.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a data transfer control method when a large amount of data is transferred between a higher-level device and a lower-level device using a communication line.

(Prior Art) In various information processing systems, when a higher-level device and a lower-level device are connected by a communication line, the lower-level device receives certain instructions from the higher-level device and executes some processing.
Mutual transfer of relatively short data, such as transferring the execution result to a host device, is frequently performed.

FIG. 2 shows a block diagram of a financial system installed in a financial institution as an example of such an information processing system.

In the figure, a host 1, which is a higher-level device, and a plurality of terminals 4, which are lower-level devices, are connected by a communication line 2, a control device 3, and a medium-speed line loop 5.

A host computer 1 is installed in a management center or the like, and a control device 3 is installed in each branch of a financial institution to control communications of a plurality of terminals 4 within the branch.

In such a system, for example, when a deposit operation, withdrawal operation, transfer operation, etc. is executed on the terminal 4, the necessary transaction data is transferred to the host 1 via the communication line 2.
The host 1 sends data necessary for business, such as deposits and savings, etc. back to the terminal 4. The terminal 4 accepts the data, executes processing in accordance with the customer's request, and transfers the processing results to the boss 1 again.

Such processing is executed in a divided manner at each of the plurality of terminals 4 connected to the medium-speed line loop 5 of the control device 3 as needed.

By the way, when executing these tasks, there are often calls from terminal 4 to host 1, or from host 1 to terminal 4.
However, it becomes necessary to transfer a relatively large amount of data. However, when a large amount of data is transferred via the communication line 2, data cannot be transferred for other tasks during the data transfer. Therefore, when such a large amount of data transfer is started, each terminal may be forced to wait for a long time to process the next task.

This slows down business operations and makes it impossible to respond quickly to customers.

Therefore, in the past, large amounts of data were transferred only at night when each terminal was not in use, and each terminal or host was equipped with memory to temporarily store data for transfer. . In addition, as other means, methods such as preparing a dedicated communication line have also been adopted in order to transfer large amounts of data.

(Problems to be Solved by the Invention) However, the following problems arise in the conventional method as described above.

First, with the method of transferring a large amount of data all at once at night, if this data were transferred to the host and processed sequentially for each task, various tasks that can be executed quickly and efficiently could be sent to the next day's processing. There must be. In addition, if a system is adopted in which a dedicated communication line is installed to transfer large amounts of data, if large amounts of data are not transferred, the communication line will not be used, resulting in a lot of waste and equipment costs. was there.

The present invention has been made with attention to the above points, and it is possible to transfer relatively short data used in normal business without interfering with the transfer of relatively short data.
The object of the present invention is to provide a data transfer control method that quickly transfers a large amount of data using the same communication line.

(Means for Solving the Problems) The data transfer control method of the present invention uses a communication line to
When transferring a large amount of data between a higher-level device and a lower-level device, two or more types of data transfer intervals are set in advance, the data is divided into a plurality of unit amounts of data, and the upper-level device is selectively set. The present invention is characterized in that data transfer is performed for each unit of data at a data transfer interval.

(Operation) In the above method, a large amount of data is not transferred all at once, but is divided into a plurality of unit amounts of data and transferred at predetermined intervals. Two or more types of data transfer intervals are set in advance, taking into consideration the usage status of the communication line. When a higher-level device requests a lower-level device to transfer a large amount of data, or when a lower-level device receives a large amount of data to be transferred from a higher-level device, the higher-level device executes data transfer at a data transfer interval selected by the higher-level device. For example, during the day when communication lines are frequently used,
Days and evenings are transferred at relatively long data transfer intervals, and data is transferred at relatively short intervals during the night and the like.

(Example) Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

FIG. 1 shows an upline data transfer sequence chart implementing the method of the present invention. Note that upline data transfer refers to a case where a terminal, which is a lower-level device, transfers a large amount of data to a host, which is a higher-level device.

Before explaining the sequence chart of FIG. 1, an apparatus for realizing this method will be explained.

FIG. 3 is a block diagram of an apparatus suitable for implementing the invention.

In the figure, in this device, a host 1 that is a higher-level device and a terminal 20 that is a lower-level device are connected to a communication line 2 and a control device 1.
Connected via 0.

Here, the control device 10 includes a host-to-host transmitting/receiving section 11;
Terminal-to-terminal transmitting/receiving unit 12 and mode selection specification message memory 13
and is provided.

The host-to-host transmitting/receiving section 11 and the terminal-to-terminal transmitting/receiving section 12 are both interfaces that control transmission and reception. As will be explained later with reference to FIG. 4, the mode selection specification message memory 13 temporarily stores a mode selection specification message received from the host 1 via the communication line 2, and sends it out to the terminal 20. memory.

The terminal 20 is provided with a transmitting/receiving section 21, a mass data transfer control section 22, a general transaction control section 23, a timer 24, and a mote/data transfer interval correspondence table 25.

The transmitting/receiving unit 21 includes an interface that controls communication with the control device 10. The mass data transfer control unit 22 is composed of a microprocessor or the like that performs a mass data transfer operation to implement the method of the present invention. The general transaction control unit 23 includes a microprocessor and the like that executes various transaction operations performed at the terminal 20. The timer 24 is composed of a circuit including a counter, a program timer, etc. that measures the data transfer interval for carrying out the method of the present invention. The mode/data transfer interval correspondence table 25 is composed of a table memory and the like that store modes, which will be explained later with reference to FIG. 5, and data transfer intervals, etc. corresponding to the modes.

Returning again to FIG. 1, first, an outline of the method of the present invention will be explained.

First, the host 1, which is a host device, transfers a mode selection designation message to the control device 10 (step 2). The mode, that is, the data transfer interval is determined by the contents of this mode selection designation message. This mode selection specification message is
As shown in FIG. 3, it is stored in the mode selection designation message memory 13 in the control device 10.

The above operations are performed by the host 1 at any predetermined timing. For example, each time the time zone changes, such as a time zone when communication line usage is low, a time zone when communication line usage is relatively high, and a time zone when communication line usage is extremely low, the host 1 informs the control device 10 that the Outputs a mode selection specification message suitable for the band. That is, this is performed periodically regardless of whether there is a request for large amounts of data transfer.

FIG. 4 shows the specific format of such a mode selection designation message.

This message is composed of a message ladder 31 and a data section 32, and the data section 32 includes a mode setting command 33.
and specification information 34.

The message ladder 31 sends messages from the host 1 to the control device IO.
Corresponds to the calling address when transferring data.

Furthermore, the mode setting command 33 is data that conveys from the host 1 to the control device that this message is a command for selecting a mode. In addition, the specification information 34 is 8
It consists of bit data, and the lower three bits are used for this mode setting. That is, the 3rd and 2nd bits ■ indicate the concentration mode, ``oo'' indicates concentration mode 1, ``ol'' indicates busy mode 2, and ``10'' indicates concentration mode 3. .Furthermore, in the least significant bit (■), "O" indicates night mode setting, and "1" indicates night mode cancellation.Data transfer intervals are set individually for each of these modes.

FIG. 5 shows a mode/data transfer interval correspondence table.

First, in this embodiment, as shown above, concentration mode 1. Working mode 2. Four modes are set: working mode 3 and night mode. The reason why three types of concentration modes are set is that the data transfer interval can be expanded or contracted in consideration of the degree of use of the communication line. That is, concentration mode 1
In concentration mode 2, the data transfer interval is set to 5 seconds, in concentration mode 2, the data transfer interval is 10 seconds, in concentration mode 3, the data transfer interval is 15 seconds, and in night mode, the data transfer interval is set to 0 seconds.

Therefore, in FIG. 4, when the bit ``■'' is "O" which sets the night mode, the data transfer interval is 0 seconds regardless of the content of the data ``■''. - On the other hand, when the bit (■) is "1" which cancels the night mode, the data transfer interval is selected from 5 seconds to 15 seconds depending on the bit (2). Such a correspondence table is stored in the mode/data transfer interval table memory 25 of the terminal 20 shown in FIG.

Note that the data transfer interval corresponding to the above mode can be determined as follows.

First, the larger the number of terminals connected to the control device 1o, the longer the data transfer interval. Also, when measuring the amount of transactions per day, the peak day is used as a reference), and the larger the amount of transactions, the longer the data transfer interval. Furthermore, when the line speed is high, data transfer is performed at high speed, so the data transfer interval is set short. Furthermore, the data transfer interval is set longer when the operating time is during the daytime when usage is concentrated, and set shorter in other cases.

Based on these factors, several types of data transfer intervals are set based on the empirical results of actually operating the system. Then, one day is divided into, for example, four time periods, and at the start of each time period, the host device rewrites the mode selection specification message of the control device.

By making such preparations, when a large amount of data transfer request occurs, the table can be immediately referred to and transfer of a unit amount of data can be started at a predetermined data transfer interval.

Returning to FIG. 1 again, when data related to various tasks is accumulated in the terminal 20 and a large amount of data transfer request occurs,
The terminal 20 sends a start request signal (SIG) to the control device 10.
) (step ■).

In response, the control device 10 sends a start response signal (SIG
) is output to the terminal 20 (step ■).

FIG. 6 shows the contents of such a start request signal (SIG).

This signal consists of 4 bytes of data, the first byte indicating that it is a start request, and the third byte indicating the priority of this request.

Further, the start response signal (SIG) is shown in FIG.

This signal also consists of 4 bytes, and the 1st and 3rd bytes are the same as the start request signal shown in FIG. Also, the second byte is the control device 10 in response to the start request.
shows the response result, and if it is “00”, it means that a normal response has been made and the start request has been accepted, and “01”
In the case of , it is a reserved bus, and in the case of “02”, it is a bus other than the target bus.
“03” means that the LU has not been set, and “00”
If any other response is received, the start request will not be accepted. Also, if the mode is "00", it is night mode,
"01" indicates busy mode 1, "02" indicates busy mode 2, and "03" indicates busy mode 3. This start response signal is created by the control device 10 shown in FIG. 3 reading out the mode selection designation message from the mode selection designation message memory 13.

When such a start reply signal is transferred to the terminal device 20, data transfer from the terminal device 20 is finally started. At this time, if the data transfer interval corresponding to the selected and designated mode is n seconds, as shown in FIG.
Data transfer will begin in seconds.

At this time, in the terminal 20 shown in FIG. 3, the large amount data transfer control unit 22 divides the large amount of data to be transferred into a plurality of unit amounts of data in advance. Then, the unit amount data is transferred to the host 1 each time. The host 1 returns a response such as a reception response to the terminal 20.

When one unit of data transfer is completed, the large amount data transfer control unit 22 shown in FIG. 3 temporarily suspends data transfer, and the timer 24 starts counting time. Then, when the timer counts for 1 second, the mass data transfer control unit 2
2 transfers the unit quantity data to the host 1. In response, the host again gives a certain response to the terminal 20.
Output for. This operation is repeated every n seconds, and a large amount of data accumulated in the terminal is output to the host 1.

According to the above method, for example, when the communication line 2 is frequently used by other terminals, etc., the other terminals, etc. Able to carry out work.

If this data transfer interval n seconds is made longer, the waiting time of other terminals, etc. will be shortened, and the adverse effects associated with large-volume data transfer will not occur. Further, by shortening the data transfer interval n seconds, a large amount of data requested by a terminal can be transferred quickly, and thereafter it becomes possible to execute online processing using the large amount of data.

In addition, when it is not a problem to make other terminal devices wait, such as at night, the data transfer interval can be changed to °゛○''.
, to transfer large amounts of data at high speed. In such a case, as described above, the mode selection designation message is switched to one that sets the night mode and is stored in the control device 10 at a predetermined timing.

FIG. 8 shows a downline data transfer sequence chart according to the method of the present invention.

This downline data transfer refers to the case where a large amount of data is transferred from the host l side to the terminal 20.

In this case, as in the embodiment shown in FIG. 1, first, a mode selection designation message is transferred to the control device 10 at a predetermined timing (step 2). This is as described above, regardless of whether it is an upline data transfer or a downline data transfer.

Here, a command to start transferring large amount of data is output from the host 1 to the control device 10 (step 2). This large amount data transfer start command is then transferred from the control device 10 to the terminal 20 (step 2). This command is included in the message normally used by the host 1 to control the terminal 20.

Next, the terminal 20 sends a start request signal (
SIG) is output. In response to this, the control device 10 outputs a start response signal (SIG) to the terminal 20. This content is exactly the same as the signal explained in step (2) and step (2) in FIG.

Thereafter, after n seconds have elapsed, the terminal 20 outputs a certain response to the host 1, and the host 1 transfers predetermined data. This data is obtained by dividing a large amount of data to be transferred into units of data. Then, the unit amount data is transferred to the terminal 20 every n seconds. During this time, the communication lines of other terminal devices are used in the same manner as described above with reference to FIG.

In this way, even when transferring a large amount of data from the host side 1 to the terminal 20, the data transfer control method of the present invention can be similarly implemented.

(Effects of the Invention) According to the data transfer control method of the present invention described above, a large amount of data is transferred in units of data at fixed data transfer intervals, so that the line can be operated continuously for a long time. The company will not be dedicated to any other work, and will not interfere with the smooth execution of other duties. Furthermore, this allows rapid transfer of a large amount of data without the need for a dedicated communication line for transferring large amounts of data, making it possible to efficiently perform various online operations.

[Brief explanation of drawings]

Figure 1 is an upline data transfer sequence chart of the present invention, Figure 2 is a block diagram of a general financial system, Figure 3 is a block diagram of a device suitable for implementing the present invention, and Figure 4 is a mode setting command message. An explanatory diagram of the format, Fig. 5 is an explanatory diagram of the mode/data transfer interval correspondence table, Fig. 6 is an explanatory diagram of the start request SIG, Fig. 7 is an explanatory diagram of the start reply SIG, and Fig. 8 is an explanatory diagram of the downlink of the present invention. It is a line data transfer sequence chart. 1... Upper device, 10... Control device, 20... Lower device. Patent applicant Oki Electric Industry Co., Ltd.

Claims (1)

[Claims] Using a communication line, between a higher-level device and a lower-level device,
When transferring a large amount of data, two or more types of data transfer intervals are set in advance, the data is divided into a plurality of unit amounts of data, and each of the unit amounts of data is transferred at the data transfer interval selected and set by the host device. , a data transfer control method characterized by executing data transfer.