JPH054702B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a local area network (LAN) control system between a host computer and a terminal (personal terminal) connected by a local area network (LAN), and particularly relates to a local area network control method between a host computer and a terminal (personal terminal) connected by a local area network (LAN). This paper relates to a communication method between programs.

[Conventional technology]

Conventionally, inter-program communication between user programs on host computers and terminals (personal terminals) connected via a local area network involves starting the user program on each terminal in advance, and then communicating between the user program and the LAN protocol control task. The communication between the two was performed using protocol control consisting of send data (SEND DATA), receive data (RECEIVE DATA), positive responses, and negative responses.

[Problem that the invention seeks to solve]

According to the conventional method described above, when performing inter-program communication between user programs on a host computer and a terminal (personal terminal) connected by a local area network, the following protocol control method has been followed.

(1) A user program that performs inter-program communication cannot be activated from another program, so it must be activated within its own station.

(2) Only a user program on a terminal (personal terminal) that has a communication control device can perform online data transfer with another host computer or terminal (personal terminal) via a communication line.

(3) Error control for data transfer is performed only by acknowledgments and negative acknowledgments; error recovery control and data flow control are not performed.

Therefore, there were the following drawbacks.

(1) Since the user program cannot itself activate the user program of the other party with which it communicates between programs, it is not possible to automate the startup and termination of the user program and to achieve distributed processing.

(2) User programs on terminals (personal terminals) that do not have communication control equipment cannot perform online data transfer with other host computers or terminals (personal terminals) via communication lines; It is not possible to share or share the database.

(3) Since error recovery control and data flow control are not performed when a failure occurs in communication between programs, data loss and disordered data transfer are likely to occur.

[Means for solving problems]

The local area network control method of this invention activates user programs, user program control tasks, LAN protocol control tasks, and communication line control tasks on host computers and personal terminals connected by a local area network (LAN). ACTIVATE SESSION
(CONNECT) / DEACTIVATE SESSION
(DISCONNECT)], connect dialog [CONNECT DIALOG(ACTIVITY
START) / ACCEPT dialog
DIALOG (ACTIVITY START ACK)], receive data [RECEIVE DATA (GIVE
TRANSFER)], SEND DATA
(DATA TRANSFER)], sync point [SYNC POINT (SYNC POINT)]/sync acknowledgement [SYNC ACK (SYNC ACK)], finish dialog [FINISH DIALG]
(ACTIVITY END)] / DISCONNECT DIALOG (ACTIVITY
END ACK)] and interrupt [INTERRUPT (INTERRUPT)]/interrupt acknowledgment [INTERRUPT ACK]
(INTERRUPT ACK)] By setting an inter-program communication protocol consisting of (INTERRUPT ACK), transmission rights control, data flow control, and task start/stop control are performed according to communication requests from user programs, resulting in orderly programs with good service quality. Provide inter-communication.

〔Example〕

Next, the present invention will be explained with reference to the drawings. FIG. 1 shows user programs 3, 4 on terminals (personal terminals) 1, 2, user program control tasks 5, 6,
and the inter-program communication control method between LAN protocol control tasks 7 and 8. here,
User programs 3 and 4 are the application layer of the OSI 7-layer model, user program control tasks 5 and 6 are the presentation layer, LAN protocol control task 7,
Reference numerals 8 and 8 are respectively located in the session layer and perform control in each layer.

User program 3 is enabled (ENABLE)
When the command is issued and the user program control task 5 accepts the request, it sends a CONNECT request based on the ACTIVATE SESSION command to the LAN protocol control task 7, local area network, and LAN protocol control task 8. Terminal 2
When the session is activated, an ACCEPT notification is sent to the LAN protocol control task 8, the local area network, and the LAN protocol control task 7, and the terminal 1
LAN protocol control task 7 of Terminal 2
A connect dialog (CONNECT DIALOG) command (ACTIVITY START) for generating and starting the user program control task 6 and user program 4 is issued to the LAN protocol control task 8. As a result, the LAN protocol control task 8 generates the user program control task 6 and the user program 4 on the personal terminal 2, and starts them up.

After the generation/startup is completed, the user program 4 issues an enable (ENABLE) command, and an ACCEPT DIALOG command indicating the completion of generation/startup is sent to the user program control task 6 and LAN protocol control task 8. Transferred and displayed as ACTIVITY START OK
LAN protocol control task 8, local area network, LAN protocol control task 7,
The user program control task 5 and the user program 3 are notified, the enable command issued by the user program 3 is completed, and inter-program communication (data transfer) between the user program 3 and the user program 4 is completed. It becomes possible.

When transmitting data from the user program 3, the user program 3 issues a send (SEND) command, and the user program control task 5 issues a send data (SEND DATA) command for data transfer to the LAN protocol control task 7. Issue. When the user program 4 on the personal terminal 2 issues a receive (RECEIVE) command, the user program control task 6 issues a receive data (RECEIVE DATA) command to the LAN protocol control task 8 to enable data reception. . As a result, LAN protocol control task 7 transfers data (DATA) to LAN protocol control task 8.
TRANSFER), and the user program 4 receives the data transferred from the user program 3 (OK DATA).

When the user program 4 issues the next receive (RECEIVE) command, the user program control task 6 issues a receive data (RECEIVE DATA) command to the LAN protocol control task 8 for making the next reception request, and then OK.
The transfer is performed to the LAN protocol control task 8, the local area network, the LAN protocol control task 7, the user program control task 5, and the user program 3, and the SEND command issued by the user program 3 is completed.

User program 3 receives (RECEIVE)
When the command is issued, the user program control task 5 issues a receive data (RECEIVE DATA) command to the LAN protocol control task 7 to perform a reception request, and the LAN protocol control task 7 then sends a give transfer (GIVE) command to the LAN protocol control task 7.
TRANSFER) is the LAN protocol control task 8
The OK SEND is transferred to the user program control task 6 and the user program 4, and the receive (RECEIVE) command issued by the user program 4 is an "OK SEND" notification indicating acquisition of the transmission right. Complete with . This enables the user program 4 to transmit data.

When terminating the inter-program communication between the user programs 3 and 4, the user program 3 issues a disable (DISABLE) command, which causes the user program control task 5 to issue a function to set the ACTIVITY END. FINISH DIALOG
Issue a command to LAN protocol control task 7,
ACTIVITY END is sent from LAN protocol control task 7 to LAN protocol control task 8, which then transfers OK FINISH to user program control task 6 and user program 4, and the user program 4. Stop the program.
“OK FINISH”, which is a cancellation request, is notified.
As a result, when the user program 4 issues a DISABLE command, the user program control task 6 issues a DISCONNECT DIALOG command that requests the session to be disconnected and the program to stop or disappear.
Issued to protocol control task 8, sent from LAN protocol control task 8 to ACTIVITY END BACK,
The data is transferred to the LAN protocol control task 7 and the user program control task 5, and the user program control task 5 executes a deactivate session (DEACTIVATE) to disconnect the session.
SESSION) command LAN protocol control task 7
LAN protocol control task 7 sends it to DISCONNECT LAN protocol control task 8, and then OK.
is transferred to the user program control task 6 and the user program 4, the DISABLE command issued by the user task 4 is completed, and the user program 4 and the user program control task 6 are stopped and disappear.

FIG. 2 shows an activation session in which the host computer generates and starts the user program 12 on the personal terminal 10 via the communication line control task 17 on the personal terminal 9, and performs data transfer with the user program of the host computer. An example of communication between programs using (ACTIVATE SESSION) packets, SEND DATA packets, etc. is shown.

FIG. 3 shows data flow control using a synchronization point by a synchronization point (SYNC POINT) → synchronization acknowledge (SYNC ACK) command to maintain orderly data transfer between the user programs 21 and 22. User program 2
1 issues a SYNC CHECK command, the user program control task 23 issues a SYNC POINT command to the LAN protocol control task 25,
The LAN session protocol control task 25 has a sink point that is the LAN protocol control task 26.
OK SYNC is sent to user program control task 24 and user program 22.
The receive (RECEIVE) command issued by the user program 22 is completed upon reception of the synchronization point check request (SYNC POINT). As a result, the user program 22 checks the order of the data, and if there is no error in the order, the user program control task 24 issues a sync acknowledge (SYNC ACK) command.
SYNC ACK to LAN protocol control task 26
Issues a command, which is executed by LAN protocol control task 26, LAN protocol control task 25, user program control task 23 user program 2
1, and the SYNC CHECK command issued by the user program 21 for data flow control is completed.

FIG. 4 shows an example in which when the user program 29 issues an ENABLE command to generate and start a user program control task and a user program on the personal terminal 28, the task creation and start fails.

FIG. 5 shows that the user program 38, which the user program 37 is receiving during data transfer using the SEND command, sends an INTERRUPT command using the INTERRUPT command to the user program control task 40 in order to acquire the right to send due to the generation of a transmission request.
An example is shown in which the user program 37 performing inter-program communication is notified through the LAN protocol control task 42.

Figure 6 shows local area network (LAN)
FIG. Terminal (personal terminal) 43,4 in the local area network
3', 43'' are connected, each terminal 43, 43', 4
3'' are connected to a floppy disk device 44, a magnetic disk device 45, and a printing device 46, respectively.The terminal 43 is also connected to a host computer.

〔Effect of the invention〕

As explained above, the present invention provides a user program on a host computer and a personal terminal in a local area network (LAN) system, a user program control task,
LAN protocol control tasks and communication line control tasks are positioned in the application layer, presentation layer, and session layer of the OSI 7-layer model, and functions are assigned to perform ACTIVATE SESSION (CONNECT)/DEACTIVATE
SESSION (DISCONNECT)], CONNECT DIALOG (ACTIVITY
START) / ACCEPT dialog
DIALOG (ACTIVITY START ACK)], receive data [RECEIVE DATA (GIVE
TRANSFER)〕, cent data〔SEND DATA
(DATA TRANSFER)], sync point [SYNC POINT (SYNC POINT)]/sync acknowledgement [SYNC ACK (SYNC ACK)], finish dialog [FINISHDIALOG]
(ACTIVITY END)/DISCONNECT DIALOG (ACTIVITY
END ACK)] and interrupt [INTERRUPT (INTERRUPT)]/interrupt acknowledgment [INTERRUPT ACK]
(INTERRUPT ACK)] and performs transmission right control, data flow control, and task activity control in accordance with communication requests from user programs to ensure orderly data transfer with good service quality. It is effective in providing

[Brief explanation of drawings]

Figure 1 shows the user program on the personal terminal, the user program control task, and
A diagram showing inter-program communication control between LAN protocol control tasks, from session opening to data transmission/reception to session closing. User program, user program control task and
Diagram showing inter-program communication control from LAN protocol control task to session opening → data transmission/reception → session closing. Figure 3 is a diagram showing data flow control during data transfer. Figure 4 is when task creation fails. FIG. 5 is a diagram showing INTERRUPT control during data transfer, and FIG. 6 is a system configuration diagram of a local area network (LAN). 17... Communication line control task, 18... Communication board.

Claims (1)

[Claims] 1. An application layer of the OSI seven-layer model between a host computer and a user program on a terminal connected by a local area network (LAN);
In the inter-program communication system located in the presentation layer and session layer, activate session/deactivate session, connect dialog/accept dialog, receive data, send data, sync point/sync acknowledge, finish dialog By setting the inter-program communication protocol consisting of /disconnect dialog and interrupt/interrupt acknowledgment, program start/stop control, program status monitoring, inter-program connection setting/release control, and bidirectional alternating communication are possible. A local area network control method characterized by controlling.