JPH0573454A - Inter-data processing communication system by turn-back in communication controller - Google Patents

Abstract

PURPOSE:To execute debug of a program, and also, to measure the efficiency of a host system and a communication controller, and to supervise a fault. CONSTITUTION:In a communication controller 3, a processing for setting virtual terminals D1-D4 and virtual circuits L1, L2 is provided. This system is provided with a processing for executing connection of plural data processing systems 1, 2 from plural virtual terminals, a processing for receiving a message to one virtual terminal from one data processing system, a processing for delivering the received message from one virtual terminal to the other virtual terminal, in the communication controller, and a processing for sending the message from the other virtual terminal to the other data processing system, and the message is given and received between two data processing systems by turning it back logically in the communication controller.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system for inter-data processing by folding back in a communication control device, and more particularly to a system for performing communication between two data processing systems in a host system equipped with the communication control device.

[0002]

2. Description of the Related Art Conventionally, communication between two data processing systems has been performed by one of the following methods.

(1) A method in which, when two data processing systems exist in different host systems, a transaction is temporarily transmitted from a communication control device to a communication line and then transmitted from another communication control device to another host system.

(2) A method of inputting data from a terminal device which generates a transaction.

[0005]

As described above, the conventional method requires a terminal, a communication line, etc. for communication between two data processing systems.

An object of the present invention is to perform inter-data processing communication by loopback in a communication control device for setting a logical communication path between two data processing systems in the communication control device without using a terminal, a communication line or the like. To provide a method.

[0007]

According to the communication system for inter-data processing by return in the communication control device of the present invention, a process of setting a virtual terminal and a virtual line in the communication control device and a plurality of virtual terminals from the plurality of virtual terminals are provided. Processing for connecting the data processing system, processing for receiving a message from one of the data processing systems to one of the virtual terminals, and communication control of the received message from the one virtual terminal to the other virtual terminal The data processing includes a process of passing the message through the virtual line in the device and a process of sending the message from the other virtual terminal to the other data processing system, and logically returning in the communication control device to perform the two data processes. Send and receive messages between systems.

[0008]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a communication system for inter-data processing by loopback in a communication control device of the present invention.

Virtual lines L1 and L2 are definitions of virtual lines that do not go out from the communication control device 3. Virtual terminal D
1, D2, D3, D4 are virtual terminals defined on the virtual line. Two virtual terminals (D1, D2 or D3.D4) are defined on one virtual line (L1 or L2), and two virtual terminals (D1, D2 or D2 are passed through the virtual line (L1 or L2). Messages are exchanged between D3.D4).

The virtual terminal control program 4 controls each of the virtual terminals D1, D2, D3 and D4 defined in advance, controls connection with the data processing systems 1 and 2, and receives messages received from the data processing systems 1 and 2. Virtual lines L1 and L2
And the process of passing the message received from the virtual lines L1 and L2 to the data processing systems 1 and 2.

The virtual line control program 5 controls each of the virtual lines L1 and L2 defined in advance, and the virtual lines L1 and L2.
Connection control for the virtual terminals D1, D2, D3, D4 on the second virtual terminal, message reception processing from the virtual terminals D1, D2, D3, D4, and the received message for the virtual terminal D1,
Processing for passing to D2, D3, and D4 is performed.

Referring to FIG. 2, which is a flow chart showing an example of the operation of the virtual terminal control program for controlling the virtual terminal, the virtual terminal control program 4 is the virtual line L1.
Wait for a connection request from L2 (step 1). When the connection request is accepted, connection processing is performed on the transaction processing systems 1 and 2 (step 2). When the connection completion from the data processing systems 1 and 2 is accepted, the virtual line L
1 and L2 are notified of the completion of connection with the data processing systems 1 and 2 (step 3). Data processing system 1,
When the connection refusal from 2 is accepted, after waiting for a certain time, the data processing systems 1 and 2 are tried to connect again (step 4). After the connection is completed, the reception of a message is waited for (step 5). If the received message is from the data processing systems 1 and 2, the message is passed to the corresponding virtual circuits L1 and L2, and the next message is waited for (step 6). If the received message is from the virtual lines L1 and L2, the message is passed to the data processing systems 1 and 2, and the next message is waited for (step 7).

Referring to FIG. 3, which is a flow chart showing an example of the operation of the virtual line control program for controlling the virtual line, the virtual line control program 5 executes the virtual line L1 after the system of the communication control device 3 is started up. Connection processing is performed for the two virtual terminals D1, D2 or D3, D4 on L2 (step 1). Virtual terminals D1, D2, D
3. Wait for reception from D4 (step 2). Virtual terminal D
When the reception from 1, D2, D3, D4 is the connection completion notification, the connection completion of the corresponding virtual terminal is recorded, and the virtual terminal D1,
The next reception from D2, D3, and D4 is waited (step 3). When the message received from the virtual terminals D1, D2, D3, D4 is a message, the other virtual terminals D1, D2, D3,
The connection completion state of D4 is checked (step 4). When the partner virtual terminals D1, D2, D3, D4 are not connected, the virtual terminals D1, D2, D3, which received the message,
D4 notifies the other virtual terminals D1, D2, D3, and D4 of an error message indicating that the virtual terminals D1, D2, D3, and D4 are not connected.
It waits for the next reception from D2, D3 and D4 (step 5). When the partner virtual terminals D1, D2, D3, D4 are in the connection completed state, the received message is passed to the partner virtual terminals D1, D2, D3, D4, and the virtual terminals D1, D2,
It waits for the next reception from D3 and D4 (step 6).

As described above, when communication between two data processing systems is performed, by using a virtual terminal and a virtual line, one is a data processing system under development and one is for generating a transaction, as shown in FIG. In the case of a data processing system, a program under development can be debugged with a simple method. Further, as shown in FIG. 5, when one is a data processing system in operation, and the other is a data processing system for generating transactions, a host system,
Also, the efficiency of the communication control device can be measured. Furthermore, FIG.
By periodically communicating between the two data processing systems as described above, it is possible to monitor the failure of the host system and the communication control device.

[0016]

As described above, according to the inter-data processing communication system by the return within the communication control device of the present invention, one of the two data processing systems can be operated by performing communication between two data processing systems without using an actual communication line. It is possible to debug the program under development by arranging the data processing system under development and the data processing system for transaction generation on one side. When one is a data processing system in operation and the other is a data processing system that generates transactions, the efficiency of the host system and the communication control device can be measured. Further, by periodically communicating between the two data processing systems, it becomes possible to monitor the failure of the host system and the communication control device.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a communication system for inter-data processing by loopback in a communication control device of the present invention.

FIG. 2 is a flow chart showing an example of the operation of a virtual terminal control program for controlling a virtual terminal in the inter-data processing communication method by the return within the communication control device of the present embodiment.

FIG. 3 is a flowchart showing an example of an operation of a virtual line control program for controlling a virtual line in the inter-data processing communication method by the return within the communication control device according to the present embodiment.

FIG. 4 is a diagram showing a case where a communication method between data processings by folding back in a communication control device of this embodiment is used for debugging a program.

FIG. 5 is a diagram showing a case where the inter-data-processing communication method by folding back in the communication control device of the present embodiment is used for efficiency measurement of the host system and the communication control device.

FIG. 6 is a diagram showing a case where the inter-data-processing communication method by loopback in the communication control device of the present embodiment is used for fault monitoring of the host system and the communication control device.

[Explanation of symbols]

 1, 2 Data processing system 3 Communication control device 4 Virtual terminal control program 5 Virtual line control program D1, D2, D3, D4 Virtual terminal L1, L2 Virtual line

Claims (1)

[Claims] 1. A process of setting a virtual terminal and a virtual line in a communication control device, a process of connecting a plurality of data processing systems from a plurality of the virtual terminals, and a process of connecting one of the virtual terminals to one of the virtual terminals. A process of receiving a message from a data processing system; a process of passing the received message from one of the virtual terminals to the other virtual terminal via the virtual line in the communication control device; Data processing by sending back the message to the data processing system, and logically returning in the communication control device to exchange messages between the two data processing systems. Inter-communication method.