JPH02119343A - Communication control system - Google Patents

Abstract

PURPOSE:To share a communication control unit such as a modem, etc., connected to a communication board by interposing a protocol control task and a local area network control task in a local area network from the task of another computer not being connected to a host computer. CONSTITUTION:A personal computer 2 is provided with a basic board 28 and a communication board 27 equipped with a communication control task 21 which performs transmission control with the host computer 14 on-line-connected via a modem 12 and a communication network 13. Also, another personal computer 3 connected to the node 8 of the communication path 1 of the local area network is equipped with only the basic board, and when the user task 34 issues an enable instruction to request the session of communication, it is transferred to the protocol control task 22 passing the LAN board 26 of the personal computer 2 and a LAN control task 25 via the local area network. The protocol control task 22, after receiving an activate section request, issues a line session request to the communication control task 21 on the communication board 27.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a host computer and a plurality of computers in a local area network that includes computers connected to the host computer via a communication line. Concerning communication control methods. In particular, when the user task of each computer in the local area network performs data transmission with the host computer, data transmission with the host computer can be easily performed from any computer. This local area network is constructed by connecting ff1H personal computers and other computers.

〔overview〕

The present invention relates to a communication control method between a host computer and a plurality of computers in a local area network that includes computers connected to the host computer via a communication line. By providing a board with the function of processing communication control tasks, and by configuring the board so that the communication control task processing on this board can be commonly used by user tasks from other computers, it can be easily accessed from any computer within the local area network. This enables data transmission with a host computer and makes system construction more economical.

[Conventional technology]

When personal computers constituting a conventional local area network are connected online, each personal computer uses a communication board, modem, network control unit (NCU) to control communication with the host computer. ) etc. are required. Therefore, only a user task on a personal computer equipped with a communication control device was able to perform data transmission with the host computer.

[Problem that the invention seeks to solve]

In the conventional communication control method between a personal computer and a host computer in a local area network described above, a communication board, a modem, and a network control unit (NCU) are used.
Only user tasks on a personal computer equipped with a communication control device such as the above can only use that communication control device to transmit data with the host computer, and user tasks on other personal computers connected to a local area network can There is a drawback that data transmission with a host computer cannot be performed by sharing communication control devices such as a communication board, modem, and network control unit.

The present invention has been made to address the above-mentioned drawbacks, and allows any personal computer connected to a local area network to easily transmit data to and from the host computer by sharing the communication control device of the personal computer connected to the host computer. The purpose of the present invention is to provide a communication control method that enables the construction of a local area network system at low cost.

[Means for solving problems]

The present invention provides a communication control method between a host computer and a plurality of computers connected to a local area network including at least one computer connected to the host computer via a communication line in the local area network, wherein each of the computers includes: A LAN control task processing means for controlling a local area network, a protocol control task processing means for controlling a protocol of a local area network and a communication node, and a user program control task processing means for interpreting and executing instructions from a user task. The computers connected to the host computer are provided with communication control task processing means for controlling transmission with the host computer by task processing from each control task processing means of each of the computers. It is characterized by

A computer connected to a local area network can be a personal computer.

[Effect]

Of the computers in the local area network,
In addition to the computer's basic board, a computer connected online to a host computer is equipped with a communication control task that can be used in common with the tasks of computers in other local area networks.
From the tasks of other computers that are not connected to the host computer, through the local area network protocol control and local area network control tasks, each computer can By sharing a communication control device such as a modem connected to a host computer, data can be transmitted in the form of an online connection with a host computer.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an example of a local area network configuration and a connection configuration with a host computer according to an embodiment of the present invention.

The local area network of this embodiment includes a plurality of personal computers 2-6 connected to a bus-type communication path 1 by respective nodes 7-11.

A personal computer 2 within this local area network is connected online to a host computer 14 via a modem 12 and a communication path 13.

FIG. 2 shows a more detailed configuration of a part of this local area network configuration, and shows a personal computer 2 connected to the host computer 14 and 3.4 of the personal computers not connected to the host computer 14. Each function is shown in a block configuration diagram.

The personal computer 2 includes a LAN board 26 that connects the personal computer 2 to a local area network, a LAN control task 25 that performs local area network control and processes LAN control tasks, a user task 24, and this user task 24. User program control task 2 that interprets and executes instructions from
3, this user program control task 23, and the LA
Protocol control task 2 that controls protocols and communication nodes through task processing from N control task 25
a basic board 28 having a modem 12 and a modem 12;
, a communication board 27 having a communication control task 21 that controls transmission with a host computer 14 connected online via a communication path 13.

Also, node 8 of communication path 1 of the local area network
The other personal computer 3 connected to is equipped with only a basic board 38, and on the basic board 38 are a user task 34, a user program control task 33 that interprets and executes instructions from this user task 34, and a protocol control task 32 that controls protocols and communication nodes through this user program control task processing;
Through this protocol task control processing, a LAN control task 35 that performs local area network control;
This LAN control task processing connects the LAN board 36 that connects this personal computer 3 to the node 8 of the local area network.

Also, node 9 of communication path 1 of the local area network
Similarly, the personal computer 4 connected to the
An N board 46 is provided on a basic board 48.

Next, FIG. 3 shows the task configuration of the personal computers 2 to 6 constituting the local area network according to the embodiment of the present invention, and the O3I (Opensystem) task configuration.
1interconnection) This shows the relationship with the basic reference model, and the tasks of the embodiment of the present invention are based on this seven-layer O3I basic reference model. In other words, LA that controls the local area network
The N control task is located in the network layer (3rd layer) and data link layer 2) of the O3I basic reference model, and the protocol control task that performs protocol and communication node conversion control is located in the O3I basic reference model. The user program control task, which is located in the presentation layer (layer 6), session layer (layer 5), and transport layer (layer 4) and interprets and executes communication instructions from user tasks, is based on the O3I basic reference model. It is located in the application layer (7th layer) of

FIG. 4 is a block diagram showing the hardware configuration of the basic board 28 and communication board 27 in the personal computer 2. As shown in FIG. That is, a microprocessor unit (MPU) is installed on the basic board 28.
51 and main memory (RAM) 52 and LAN boat 2
6 is implemented to constitute the main processor. The communication board 27 also includes a microprocessor unit (MPU) 54 and a local memory (R
AM) 55 and a communication control LSI 56 are mounted, and constitute a local processor for the main processor on the basic board 28.

Next, the operation of one embodiment of the present invention will be explained with reference to the drawings.

FIG. 5 is a diagram illustrating a communication control operation sequence from, for example, the personal computer 3 to the host computer 14 among the other personal computers 3 to 6 when the personal computer 2 is connected online to the host computer 14. .

Host computer 1 from Burnal computer 3
Communication control for 4 is performed as follows.

When the user task 34 on the basic board 38 of the mass/personal computer 3 issues an enable command requesting the opening of communication, the user program control task 33 interprets the command and notifies the protocol control task 32 as an open command. The protocol control task 32 activates an activated session (Ac
This activate session request is sent to the LAN control task 35,
The LAN board 36 is transferred and connected to the LAN of the personal computer 2 via the local area network.
The data is transferred to the protocol control task 22 via the board 26 and the LAN control task 35. After receiving this activate session request, the protocol control task 22 issues a line opening request to the communication control task 21 on the communication board 27. After the line opening process is completed, the protocol control task 22 performs a connect dialog (Co
nnec Dialog) response from the LAN control task 25 to the LAN board 26, local area network, LAN board 36, and LAN control task 35.
After that, the protocol control task 32 of the personal computer 3 is notified. Upon receiving this notification, the protocol control task 32 activates the
vate 5tart) As completion, the user program control task 33 is notified of the completion of the open command, and the user program control task 33
4 Notify completion of Hay Enable command.

As a result, the basic board 3 of the personal computer 3
The user task 34 on the personal computer 2
Communication control task 2 on the communication board 27 of
Online connection to the host computer 14 is possible via 1.

Next, when the user task 34 of the personal computer 3 issues a send command, the user program control task 33 interprets the send command and notifies the protocol control task 32 as a send command, and the protocol control task 32 requests the send data. This send data request is transferred to the protocol control task 22 via the LAN control task 35, the LAN board 36, the local area network, the LAN board 26 of the personal computer 2, and the LAN control task 25. After receiving the send data request, the protocol control task 22 performs protocol conversion and code conversion of the send data, and issues a data send request to the communication control task 21 on the community engine board 2, and the communication control task 21 Data is transmitted to the host combination cork 14 using the two appropriate communication methods. After data transmission is completed, communication control task 21
sends a completion notification to the protocol control task 22, and this protocol control task 22 sends an OKD response to LA.
N control task 25, LAN board 26, local area network, LAN of personal computer 3
The protocol control task 32 is notified via the board 36 and the LAN control task 35. The protocol control task 32 notifies the user program control task 33 of the completion of the send command as an OK send, and the user program control task 33 notifies the user task 34 of the completion of the send command.

Next, when the user task 34 issues a receive command, the user program control task 33 interprets it and
- The protocol control task 32 transfers the receive data request via the LAN control task 35, LAN board 36, local area network, LAN board 26, and LAN control task 25 to the protocol control task 32. Notify task 22. After receiving the receive data request, the protocol control task 22 secures a receive buffer and transfers the data to the communication control task 21 on the communication board 27.
Make a receive request to. When the communication control task 21 receives data from the host computer 14 in accordance with the corresponding communication procedure, the communication control task 21 transfers the received data to the protocol control task 22. After protocol conversion and code conversion of the receive data, the protocol control task 22 transmits the receive data to the LAN city 11? Wholesale task 25
, LAN board 26, local area network, L
The data is transferred via the AN board 36 and the LAN control task 35 to the I/O task 32 via the protocol to notify the OK receive. The protocol control task 32 notifies the user program control task 33 of the completion of the receive command as an OK receive, and the user program control task 33 notifies the user task 34 of the completion of the transfer of received data and the receive request.

When the user task 34 issues a disable command requesting communication closure, the user program control task 33 interprets this and notifies the protocol control task 32 as a close command. The protocol control task 32
Finish Dialog
g) Request to LAN control task 35, LAN board 36
, local area network, LAN board 26, L
It is transferred to the protocol control task 22 via the AN control task 25. After receiving this finish dialog request, the protocol control task 22 starts a deactivate session (Deactivate session).
) makes a line opening request to the communication control task 21 on the communication board 27, and after completing the line opening process, sends a deactivate session response to the LAN control task 25, LAN board 26, local area network, LAN board 36, The protocol control task 32 is notified via the LAN control task 35. Upon receiving this notification, the protocol control task 32 determines that the finish dialog has been completed and executes the user program control task 33.
The user program control task 33 notifies the completion of the close command to the user task 34 (D
isable) Notifies completion of the instruction. As a result, the user task 34 on the basic board 38 of the personal computer 3 is disconnected from online connection with the host computer via the communication control task 21 on the communication board 27 of the personal computer 2.

When the user task 24 on the basic board 28 of the personal computer 2 issues an enable command requesting the opening of communication, the user program control task 23 interprets it and sends it to the protocol control task 2 as an open command.
Notify 2. The protocol control task 22 transfers the activate session request to the communication control task 21 on the commutation board 2 of the same personal computer, and after completion of the line opening process, sends an open command to the user program control task 23 as completion of the activate start. Notify. User program system '1
The JII task 23 notifies the user task 24 of the completion of the Hay Enable command. As a result, the user task 24 on the basic board 28 of the personal computer 2 is transferred to the communication board 2 of the same personal computer 2.
Online connection with the host computer is possible via the communication control task 21 on 7.

Next, the operation when the personal computer 2 independently performs online data transmission with the host computer 14 will be described.

Figure 6 shows the basic board 28 and communication board 2.
7, a user task communicates with the host computer 1 via the communication control task 21.
4 is a diagram showing a sequence when data is transmitted.

When the user task 24 on the basic board 28 of the personal computer 2 issues an enable command requesting the opening of communication, the user program control task 23 interprets it and sends it to the protocol control task 2 as an open command.
Notify 2. Upon notification of this open command, the protocol control task 22 transfers the activate session request to the communication control task 21 on the communication board 27 of the same personal computer 2. After the communication control task 21 completes the line opening process, the protocol control task 22 notifies the user program control task 23 of the completion of the open command as the activation start has been completed, and the user program control task 23
notifies the completion of the user task 24 hay enable command. This allows the user task 24 on the basic board 28 of the personal computer 2 to connect online to the host computer 14 via the communication control task 21 on the communication board 27 of the same personal computer 2.

Next, when the user task 24 issues a send command, the user program control task 23 interprets it and notifies the protocol control task 22 as a send command,
The protocol control task 22 performs protocol conversion and code conversion of the send data based on the send data request, and then issues a data send request to the communication control task 21 on the communication board 27 . The communication control task 21 controls the host computer 1 according to the corresponding communication procedure.
After the data transmission is completed, the protocol control task 22 is notified of the completion. The protocol control task 22 notifies the user program control task 23 of the completion of the send command as an OK send, and the user program control task 23 notifies the user task 24 of the completion of the send command.

Next, when the user task 24 issues a receive command,
The user program control task 23 interprets it and notifies the protocol control task 22 as a receive command. In response to this notification, the protocol control task 22 reserves a receive buffer as a receive data request, and issues a receive data request to the communication control task 21 on the communication board 27. When the communication control task 21 receives data from the host computer 14 according to the corresponding communication procedure, the communication control task 21 transfers the received data to the protocol control task 22.
performs protocol conversion and code conversion of the receive data, and then notifies the user program control task 23 of the completion of the receive command as an OK receive response. User program control task 23 is user task 2
Transfer of the received data and notification of the completion of the receive command to 4.

Next, when the user task 24 issues a disable command requesting communication closure, the user program control task 23
interprets it and notifies the protocol control task 22 as a colog command. Based on this notification, the protocol control task 22 issues a line closing request to the communication control task 21 on the communication board 27, using the finish dialog request as a deactivate session.

After completing the line opening process, the protocol control task 22 notifies the user program control task 23 of the completion of the close command as the deactivation session non-completion,
The user program control task 23 is the user task 24
Notifies the completion of the Hede Saber command. As a result, the user task 24 on the basic board 28 of the personal computer 2 is disconnected from the online connection with the host computer 14 via the communication control task 21 on the communication board 27 of the same personal computer 2.

In this way, data transmission can be performed by online connection from any personal computer in the local area network via the communication control task on the communication board 27 of the personal computer 2 connected to the host computer 14.

Although the local area network in this embodiment is configured by connecting personal computers 2 to 6 to the communication path 1, the computers configuring the local area network are not limited to personal computers.
Workstations and other computers can be configured by connecting them to a communication path, and the configuration of the local area network can be configured in a ring type or star type instead of the bus type shown in the above embodiment. Of course.

〔Effect of the invention〕

As explained above, the present invention allows the communication control task processing on the communication board of the computer connected to the host computer to be shared and used even from the user task on the basic board of each computer constituting the local area network. However, by sharing a communication control device such as a modem connected to the computer, data can be easily transmitted with the host computer.

Therefore, since it is not necessary to equip each computer with a communication control device, the system can be constructed at low cost, and there is an advantage that data transmission can be performed from any computer by the same operation.

[Brief explanation of the drawing]

FIG. 1 is a side view of a local area network configuration to which an embodiment of the present invention is applied. FIG. 2 is a diagram showing a part of a more detailed configuration of an embodiment of the present invention. FIG. 3 is a correspondence diagram showing the relationship between the tasks of the embodiment of the present invention and the O31 basic reference model. FIG. 4 is a block diagram showing the hardware configuration of the basic board and communication board according to the embodiment of the present invention. FIG. 5 is a diagram illustrating a communication control operation sequence according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a communication control operation sequence according to an embodiment of the present invention. 1.13... mail (HL 2-6... personal computer (PC), 7-11... node, 12...
・Modem, 14...Host computer, 21...
Communication control task, 22.32.42...Protocol control task, 23.33.43...User program control task, 24.34.44...User task, 25
．． 35.45...LAN control wholesale task, 26.36.
46... LAN board, 27... Communication board, 28.38.48... Basic board, 51.
54...Microprocessor unit (MPU),
52...Main memory, 55...Local memory,
56...Communication control LSI.

Claims (1)

[Scope of Claims] 1. A communication control method between a host computer and a plurality of computers connected to a local area network including at least one computer connected to the host computer via a communication line in the local area network, comprising: Each computer includes a LAN control task processing means for controlling the local area network, a protocol control task processing means for controlling the protocol of the local area network and communication nodes, and a user program control task for interpreting and executing instructions from the user task. and a communication control task processing means for controlling transmission with the host computer by task processing from each control task processing means of each of the computers connected to the host computer. A communication control method characterized by: