JPH02155352A - Data communication system in public line network - Google Patents

Abstract

PURPOSE:To attain economical and rational data communication while utilizing a public line by interrupting a public line network after a data terminal section sends a data to a central processing section and recalling the data terminal section after the central processing section records and processes the sent data. CONSTITUTION:A MODEM 3 sends a signal sent to a central processing section 9 after a code of a data input end, for example is added by the instruction of an electronic computer 2, the transmission of a data terminal set 1 is finished to interrupt a public line network. A MODEM 5 with automatic outgoing function receives a data from the data terminal equipment 1 till a data input end code is detected, demodulated and sent to a large sized computer 6, and when the data input code is detected, the reception of data is finished. When all the computer processing of the large sized computer 6 is finished, the telephone number of the data terminal equipment is read from a storage device 7 to instruct the origination to the data terminal equipment 1 to the MODEM 5 with automatic outgoing function and the computer 6 sends a required data such as the result of computer processing to the data terminal equipment 1 when the public line network is connected.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a data communication system in a public line network between a data terminal unit and a central processing unit, and particularly relates to retransmission after the central processing unit completes calculation processing. It is something.

(Prior art) In a conventional data communication system between a data terminal unit and a central processing unit using a public line network, the central processing unit performs calculation processing after the data terminal starts inputting data to the central processing unit. , it was common for the public line network to be maintained until the calculated results had been transmitted.

[Problem to be solved by the invention]

Therefore, in conventional data communication systems, the data terminal unit starts inputting data to the central processing unit, the central processing unit calculates and processes the input data, and the central processing unit finishes transmitting the calculated results. Until now, the public line network between the data terminal section and the central processing section was maintained, and call charges were not incurred while the central processing section was processing data, that is, when the data terminal section and the central processing section were not communicating data. It had the disadvantage of being bulky. Therefore, especially in processes such as simulations that require a long time, call charges become high and it is uneconomical.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate such drawbacks and provide a data communication system in a public line network that allows economical and efficient data communication between a data terminal unit and a central processing unit.

[Means to solve the problem]

The present invention is a data communication system in a public line network in which a data terminal unit and a central processing unit communicate data via a public line network, wherein after the data terminal unit finishes transmitting data to the central processing unit. The present invention is characterized in that the public line network is disconnected, and the central processing section records and processes the data transmitted from the data terminal section, and retransmits the data to the data terminal section.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a data communication system for explaining a data communication method according to an embodiment of the present invention.

This data communication system is composed of a data terminal section 8, a public line network 4, and a central processing section 9.
Data communication is performed between the central processing unit 9 and the central processing unit 9.

The data terminal unit 8 includes a data terminal 1, a computer 2,
The terminal operator inputs data and transmits it to the central processing section 9, and outputs calculation results sent from the central processing section 9.

The data terminal 1 comprises, for example, a keyboard printer,
Computer 2 reads the data entered by the terminal operator.
or outputs the calculation results etc. sent from the central processing unit 9. The computer 2 stores data from the data terminal 1 and controls each data terminal. The modem 3 modulates data stored in the computer 2 and sends it to the central processing section 9, or demodulates data sent from the central processing section 9 and sends it to the computer 2.

The central processing unit 9 consists of a modem 5 with an automatic call function, a large-scale computer 6, and a storage device 7. The central processing unit 9 calculates and processes data from the data terminal unit 8, and sends the calculation results etc. after the calculation process to the data terminal unit. Retransmit on 8.

A modem 5 with an automatic calling function receives data from a data terminal section 8 via the public line network 4, demodulates the data, and sends the data to a large computer 6.
Send to. In addition, the large hand 33 automatically transmits the calculation results processed by the large computer 6 to the data terminal section 8 according to the instructions of the large hand 33:[6. The large computer 6 instructs the storage device 7 to store the data transmitted from the data terminal unit 8, performs calculation processing on the data read from the storage device 7, and automatically transmits the results of calculation processing, etc. The functional modem 5 is instructed to transmit data to the data terminal section 8. The storage device 7 writes and reads data according to instructions from the large-scale computer 6.

Next, the operation of this embodiment will be explained. Data terminal section 8
It is assumed that the central processing unit 9 and the central processing unit 9 are connected through a public line network, and data transmission and reception are not yet performed. For example, when a terminal operator logs in from the keyboard of a keyboard printer, the logged-in signal is transmitted from data terminal 1 to computer 2.
is loaded into. The signal read and logged into the computer 2 is modulated by the modem 3 and transmitted via the public line network 4 to the modem 5 with an automatic calling function. A modem 5 with an automatic transmission function receives a signal from a data terminal section 8, demodulates it, and sends it to a large computer 6. When the large needle n machine 6 is logged in from the data terminal section 8, the large computer 6 searches for the login name of the data terminal 1 from the already registered login names, and after recognizing the registered data terminal 1, Instructs the storage device 7 to write data. The storage device 7 receives instructions from the large-scale computer 6 and writes data from the data terminal 1 into a predetermined area of the memory.

The terminal operator is data terminal 1, electronic computer 2. Modem 3. Public line network 4. Necessary data is input to the large-sized computer 6 via the modem 5 with an automatic transmission function, and the input data is recorded in the storage device 7 by the large-sized computer 6. When the data input is finished, the terminal operator operates the keyboard to instruct the end of the data input. The data input end instruction signal is sent from the data terminal 1 to the computer 2, and the computer 2 instructs the modem 3 to stop transmitting data to the central processing unit 9. The modem 3 attaches, for example, a code indicating the end of data input to the signal sent to the central processing unit 9 based on the instruction from the computer 2, and sends the signal to end the data input terminal 1 and disconnect the public line network.

The modem 5 with an automatic transmission function receives data from the data terminal 1 until it detects a data input end code, demodulates and sends it to the large computer 6, and ends data reception when the data input code is detected.

The large-scale computer 6 instructs the storage device 7 to read out the data of the data terminal 1 written in the storage device 7 from the storage device 7 and perform calculation processing according to the processing program. When all calculation processing is completed, the large computer 6 reads the telephone number of the data terminal 1 from the storage device 7 and instructs the modem 5 with an automatic calling function to make a call to the data terminal 1. A modem 5 with an automatic calling function makes a call to the data terminal 1 via the modem 3, and when the public line network is connected, it sends necessary data such as calculation results to the data terminal 1. The transmitted data is printed on printer paper or the like of the data terminal 1. When the transmission is completed, the large-sized computer 6 connects the modem 5 with an automatic dialing function.
to disconnect the public line network and complete all processing.

As described above, this public line network disconnects the public line &9m after the data terminal unit 8 finishes transmitting data to the central processing unit 9.
The central processing unit 9 records data from the data terminal unit 8,
After the calculation processing of the recorded data is completed, the data terminal section 8
This is a data communication system in which data such as calculation results is transmitted from the central processing unit 9 to the data terminal unit 8 after making a call to the public line network and reconnecting to the public line network.

〔Effect of the invention〕

As explained above, in the present invention, after inputting data from a data terminal, the public line is disconnected, and the large-scale computer retransmits data to the data terminal after processing the calculation, so that data is not sent and received between the data terminal and the large-scale computer. The public network is in use only while

This enables economical and rational data communication using public lines, which has the effect of reducing call charges.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a data communication system for explaining a data communication system according to an embodiment of the present invention.・Data terminal ・Electronic computer ・Modem ・Public line network ・Modem with automatic call function ・Large computer ・Storage device ・Data terminal section ・Central processing section

Claims (1)

[Claims] (1) A data communication method in a public line network in which a data terminal unit and a central processing unit communicate data via a public line network, wherein after the data terminal unit finishes transmitting data to the central processing unit, the A data communication system in a public line network, characterized in that the public line network is disconnected, and the central processing unit records and processes data transmitted from the data terminal unit, and retransmits the data to the data terminal unit.