JPS62269533A - Data communication system - Google Patents

Abstract

PURPOSE:To improve the data transmission speed effectively by storing data sent to a data buffer at each receiving terminal, and receiving data reception notices returned from each reception terminal altogether after the data is sent to all the receiving terminals. CONSTITUTION:A sending-side terminal stores data to be sent to each receiving side terminal 3 while dividing it to each receiving terminal 3. The dat stored in a data buffer 5 is extracted at each receiving terminal 3 and it is sent to the receiving side terminal 3 to be sent by an N:N communication means 9 of a transmission line 4. When the data to be sent is lost in the buffer 5, the data reception noticesreturend from all the terminal 3 sending the data received by a 1:N communication means 10 of the line 4. Thus, the waiting time is decreased substantially, the communication time is reduced to that degree and the data communication system with high effective data communication speed is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data communication system in which a receiving terminal that has received data returns a data reception notification to a transmitting terminal.

[Conventional technology]

Figure 3 shows, for example, MELCOM 350 SYSTE
MrMDWs 60 support package MEDPAK-
According to the communication procedure shown on page 63 of ``60 Instruction Manual'' (published by Mitsubishi Electric Corporation). This is a system configuration diagram showing a conventional data communication system. In the figure, 1 is a transmitting terminal, 2 is an input/output port occupied by this transmitting terminal 1, 3 is a receiving terminal, and 4 is this receiving terminal. 3 and the input/output boat 2.

Next, the operation will be explained. In order to perform data communication with the transmission line 4, the sending terminal 1 first connects the input/output port 2.
occupies one boat. Next, data is transmitted to the transmission line 4 via this input/output port 2, and the second transmission line 4 sends this data to the receiving terminal 3.

In response to receiving this data, the receiving terminal 3 sends a data reception notification to the transmitting terminal 1 via the transmission path 4.
Send it back to After receiving the data reception notification from the sending terminal 1, if there is data to be sent to a different terminal, data transmission is repeated in the same manner through the input/output boat 2ft.

If there is no data to be transmitted, the right to use the occupied input/output port 2 is relinquished and data communication is completed.

[Problem that the invention seeks to solve]

Since the conventional data communication method is configured as described above, after the sending terminal transmits the data.

Since the input/output boat remains occupied until a data reception notification is returned from the receiving terminal, data cannot be continuously sent to different terminals via one input/output boat. In the case of data transmission, there is a problem in that the communication time becomes longer by the repetition of this waiting time, and the effective data transmission speed decreases.

This invention was made to solve the above problems.
When transmitting data continuously to multiple different terminals via one input/output port with fc, it reduces the waiting time until a data reception notification is returned and effectively increases the data transmission speed. The aim is to obtain an improved data communication method.

[Means for solving problems]

The data communication method according to the present invention stores data to be transmitted in a data buffer for each receiving terminal, and sequentially transmits the data to each receiving terminal, thereby transmitting data to all terminals to be transmitted. After finishing.

An unexpected data reception notification sent back from the receiving device? It is designed to be received all at once.

[Effect]

The data communication method according to the present invention receives data reception notifications sent back from each receiving terminal all at once, so that the data to be transmitted stored in the data buffer is transferred one by one from the receiving terminal. The data is sent to each receiving terminal without waiting for the return notification of data reception, and the waiting time from the time the data transmission to the receiving terminal is completed until receiving the data reception notification is no longer necessary each time data is sent, and the waiting time is substantially reduced. effectively improve the data transmission speed.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, numerals 1 to 4 are a transmitting terminal, an input/output port, a receiving terminal, and a transmission line. Further, 5 is a data buffer that stores all the data to be transmitted, 6 is a detection means for detecting whether or not there is any data to be transmitted in the data buffer 5, and 7 is a detector for extracting data to be transmitted from the data buffer 5. a transmitting means for transmitting to a predetermined receiving terminal 3;
Reference numeral 8 denotes a device for reading out data reception notifications sent back from each of the receiving terminals 3 all at once.

The sending terminal 1 is equipped with each of these means. Also, 9
is an N:N communication means for N:N communication that performs l-to-l data transmission between arbitrary terminals, and transmits data to arbitrary one or more terminals with one input/output channel , 1: for 1:N communication that can collectively receive data sent from one or multiple terminals.
The transmission path 4 is constituted by N communication means.

Further, 11 is a receiving means for receiving data sent from the transmitting terminal 1, and 12 is a returning means for transmitting a data reception notification in response to the reception of the data to the transmitting terminal 1.
The receiving terminal 3 is equipped with each of these means.

Next, the operation will be explained. FIG. 2 is a flowchart showing the flow of processing in the sending terminal 1. As shown in FIG. The transmitting terminal 1 first stores data to be transmitted to the receiving terminal 3 in the data buffer 5 separately for each receiving terminal 3 in step ST1.

Next, in step ST2, input/output ports 2 to 1 are occupied for data exchange 2 between the transmitting terminal 1 and the transmission line 4. Next, in step ST3, the transmitting means 7 takes out the data stored in the data buffer 5 marked with # for each receiving side terminal 3, and transfers it to the N:N communication means 9 of the transmission path 4.
The data is sent to the receiving terminal 3 according to the method. Detection means 6
Each time the data transmission process in step ST3 is completed.

Checking whether data to be sent to another different receiving terminal 3 still remains in the data buffer? A check is made in step ST4, and if n remains, the process returns to step ST3 and the transmitting means 7 repeats the data transmitting process. When there is no more data to be transmitted in the data buffer 5, the reading means 8, in step ST5, sends the data reception notifications returned from all the receiving terminals 3 that have transmitted the data through the 1:N communication means 10 of the transmission path 4. Receive. Is there still data reception information here? If there is a receiving terminal 3 that has not returned data, a data reception notification is returned only for that receiving terminal 3 in step ST6.
The l:NA communication means 10 performs reception until the signal is reached. When the data reception notifications from all the receiving terminals 3 have been received, the right to use the input/output boat 2 is relinquished in step ST7, and the process is ended.

In the above embodiment, data is sent and received through one input/output port for N:N communication and 1:N communication, but data is sent and received using separate input/output ports. It's okay.

Also, instead of 1:N communication, it is also possible to provide a common memory between each terminal to send and receive data reception notifications.
Furthermore, when transmitting data from a transmitting terminal to a receiving terminal, it is also possible to transmit data by an N communication method or a method via a common memory instead of N:N communication.

〔Effect of the invention〕

As described above, according to the present invention, data to be transmitted is stored in a data buffer for each receiving terminal, and after transmitting this data to all receiving terminals to which data should be transmitted,
Since the configuration is such that data reception notifications sent back from each receiving terminal are received all at once, the waiting time is significantly shortened, and the communication time is shortened accordingly, which increases the effective data communication speed. This has the effect of providing a high data communication method.

[Brief explanation of drawings]

Fig. 1 is a system configuration diagram showing a data communication method according to an embodiment of the present invention, Fig. 2 is a flowchart showing the flow of processing at the transmitting terminal, and Fig. 3 is a system configuration showing a conventional data communication method. It is a diagram. 1 is the sending terminal, 2 is the input/output port, 3 is the receiving terminal,
4 is a transmission path, 5 is a data buffer, 6 is a detection means, γ is a transmission means, 8 is a reading means, 9 is an N:N communication means, 10
is a 1:N communication means, 11 is a receiving means, and 12 is a return means. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant Mitsubishi Electric Corporation)! (2 others) -

Claims (2)

[Claims] (1) Having a plurality of terminals, connecting these terminals with each other via a transmission path, and receiving data from the receiving terminal to the transmitting terminal in response to data transmission from the transmitting terminal to the receiving terminal. In a data communication system in which notifications are sent back, each terminal is equipped with a data buffer, and when transmitting data, data to be transmitted is stored in each receiving terminal in advance in the data buffer, and the data stored in this data buffer is stored in the data buffer. The data communication is characterized in that data is transmitted to each of the receiving terminals in sequence, and a data reception notification from each of the receiving terminals is received all at once after data transmission to each of the receiving terminals is completed. method. (2) Data transmission to each receiving terminal is performed once between terminals.
Performed by N:N communication that performs one-to-one data communication,
Send data reception notifications from each of the receiving terminals to any one or more terminals via one input/output channel, and receive data sent from the one or more terminals all at once. 1. The data communication method according to claim 1, wherein the data communication method is performed by 1:N communication.