JPH0344250A - Communication control system - Google Patents

Abstract

PURPOSE:To improve the maintenance performance of various communication systems by providing a timer section generating a reception request interrupt to its own main computer and monitoring the time up to a text report request at the reception of a text sent from an opposite communication controller and a function sending a reply displaying a fault of its own main computer. CONSTITUTION:A timer section 10 is provided with a communication controller 21 of a receiver side computer system and monitors a time from the issue of a reception request interrupt till a text report request at a fault of a main computer at the receiver side and a program is provided to the system and publicates a reception request interrupt to its own main computer 11, starts a timer section 10, discriminates it as a fault of its own main computer 11 at timeover, displays a fault of its own computer and sends the displayed reply to the sender side when a text sent from an opposite communication controller is received. Thus, the text sender detects a fault of the opposite computer to avoid the check of location of the fault for a long time.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a communication control method for a communication system that connects and communicates between computer systems, and is particularly applicable to maintenance of a communication control device or when an abnormality occurs in communication operation. This invention relates to a communication control method suitable for investigation, etc.

[Conventional technology]

In general, the communication control device of a conventional communication system that connects and communicates between computer systems does not perform self-main computer abnormality monitoring, and the main computer on the receiving side or the transmitting/receiving unit 9 of the communication control device Abnormalities in the communication line and the transmitting/receiving section of the transmitting side communication control device have been detected using a non-response detection method by monitoring responses on the transmitting side, the main computer, regardless of the abnormality in any part. Note that related communication control methods of this type include, for example, JIS standard
5002 basic form data transmission control procedure, etc.

[Problem to be solved by the invention]

The above-mentioned conventional technology is used during maintenance of a communication control device of a communication system that connects and communicates between computer systems,
No consideration was given when investigating the occurrence of a communication malfunction, and it took a long time to investigate which part of the main computer on the receiving side, the transmitting/receiving section 9 communication line of the communication control device, or the transmitting/receiving section of the transmitting side communication control device was abnormal. The purpose of the present invention is to provide a communication control system that eliminates the drawbacks of the prior art.

[Means to solve the problem]

To achieve the above purpose, communication control equipment.

When a text sent by the other party's communication control device is received, a timer section generates a reception request interrupt to the local main computer and monitors the time until the text report request, and when a certain period of time has passed, the received text is discarded and the local main computer It has a built-in function to send a response indicating a computer error.

[Effect]

According to the above means, when there is an abnormality in the main computer on the receiving side, a timer unit provided in the communication control device of the receiving computer system that monitors the time from issuance of a reception request interrupt to a text report request, and a text sent by the communication control device on the receiving side. At the time of reception, the text sending side issues a reception request interrupt to the own main computer, starts this timer section, determines that the own main computer is abnormal when the time is up, and sends a response indicating the own computer abnormality to the sending side. An error in the other computer can be detected.

〔Example〕

An embodiment of the present invention is shown in FIGS. 1, 2, and 3.

This will be explained with reference to FIG. FIG. 1 is an overall configuration diagram showing communication control devices 21 to 2n connected to main computers 11 to 1n and computer interface buses 31 to 3n.
Each computer system constituted by the above computer systems is connected to each other by a communication line 4. With such a configuration, a communication system for communicating between computer systems is formed. Communication control device 21 here~
2n has functions such as data transfer control with the main computers 11 to 1□, text transmission/reception control with the communication line 4, and response transmission to reception. As for data transmission procedure control, the text sending side monitors the text reception response of the text transmitter receiving side, and the text receiving side receives the text and transmits the reception response upon completion of reporting to its own main computer. Due to the above conditions, the following
FIG. 1 is a block diagram of a communication control device in a computer system, showing an embodiment; FIG. 3 is a communication control process flow diagram when receiving text in the communication control device, showing an embodiment; FIG. A detailed circuit configuration and operation will be described using a communication control processing flowchart when receiving text in the communication control device. Here, the description will be made assuming that the communication control device 21 receives text. In the block diagram of FIG. 2, the computer interface bus 31 is connected to the computer side control section 8, and the communication line 4 is connected to the communication line side control section. These computer side control section 8 and communication line side control section 9
is connected to the arithmetic processing unit 5 via the internal interface bus 11.
connected to. In addition, the arithmetic processing section 5 includes a program storage section 6. Data storage unit 7. The timer section 10 is also connected to the communication control device 2 of the computer system of the computer system 2 of FIG.
1, and the conventional communication control device does not include the timer unit 10 in the circuit configuration shown in FIG. With the above circuit configuration, the communication control device 21 of the computer system connects the main computer 1 via the computer interface bus 31.
The transmission command and transmission data from 1 are sent to the computer side control unit 8.
and reports it to the arithmetic processing unit 5 via the internal interface bus 11.

The arithmetic processing unit 5 interprets transmission commands, converts the format of transmission data, etc. using a program stored in a program storage unit 6 in which a program for performing predetermined transmission control processing is stored in advance, and a data storage unit 7 that temporarily stores transmitted and received data. The data is then converted into a predetermined timing and format by the communication line control unit 9, and transmitted as a transmission text to the communication line wI4. On the other hand, text received from the communication line 4 is received by the communication line side control section 9, converted into a predetermined timing and format, and reported to the arithmetic processing section 5 via the internal interface bus 11. The arithmetic processing unit 5 converts the format of the received data using a program and data storage unit 7 stored in a program storage unit 6 in which a program for performing predetermined reception control processing is stored in advance, and converts the format of the received data to the computer interface bus 31 by the computer side control unit 8. A reception request interrupt is issued to the main computer 11 via the main computer 11, and the timer unit 10 is started, which has set a monitoring time TR until the text report request.

If there is a text report request from the main computer 11 before the monitoring time TR time-up, this will be interpreted and the timer unit 10 will
After resetting the TR and reporting the received text to the main computer 1, the reception response is sent to the text sending side via the communication line side control unit 99 and the communication line 4, and the report from the main computer 11 is sent by the monitoring time TR time up. If there is no request, it is determined that the main computer 11 is abnormal, and after discarding the received text, the main computer abnormality display response is sent to the communication line side control unit 9. The text is sent to the text sender via the communication line 4. The monitoring time TR of the timer section here is determined by the main computer 11.
It is assumed that the time is longer than the maximum delay time from receiving a reception request interrupt to issuing a text report request during normal operation. FIG. 3 shows a flowchart of communication control processing at the time of text reception in the communication control device according to the above embodiment. Figure 4 shows a communication control processing flow diagram when receiving text in a conventional communication control device.
1, and waits forever until a text report request is received, so if the main computer is abnormal, a reception response is not sent to the text sending side, and the main computer on the text sending side does not respond due to response monitoring. is detected by the receiving side main computer 11 or the communication control device 21.
, communication line 4. The abnormality in any part of the transmitting side communication control device 2n could not be distinguished, and no consideration was given to maintenance. However, according to this embodiment, the communication control device 21 monitors the abnormality in the receiving side main computer 11. When an abnormality is detected, the main computer abnormality display response is sent to the text sending side, so the sending side can detect the abnormality and can distinguish it from the sending side or receiving side communication control device 29 communication line 4 abnormality, improving maintainability. Thus, a communication control system that eliminates the drawbacks of the prior art can be realized.

〔Effect of the invention〕

According to the present invention, an abnormality in the main computer on the receiving side of a communication system that connects and communicates between computer systems can be detected on the sending side using a simple circuit configuration and a communication processing control program when receiving text. It is possible to distinguish between abnormalities in the communication line on the side or on the receiving side communication control device 2, and it is possible to improve the maintainability of various communication systems.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram, Fig. 2 is a block diagram of a communication control device of the computer system shown in Fig. 2, which shows one embodiment, and Fig. 3 is a communication control when receiving text in the communication control device, which shows one embodiment. Process Flow Diagram FIG. 4 is a flow diagram of communication control processing when receiving text in a conventional communication control device. 11-1n...Main computer, 21-2n...Communication control device, 31-3n...Calculation interface bus, 4...Communication line, 5...Arithmetic processing unit, 6...Program storage 7... Data storage unit, 8... Computer side control unit, 9... Communication line side control unit, 10... Timer unit, 11... Internal interface bus, TR
・・・Timer part 1 Figure 1 Figure 1

Claims (1)

[Claims] 1. A program storage unit that stores a predetermined processing program, a data storage unit that temporarily stores transmission/reception data and control information, a computer-side control unit that controls data transfer with the main computer, and others. A reception request interrupt occurs in a communication control device of a communication system that connects and communicates between computer systems, which is composed of a communication line side control unit that controls text transmission and reception with the computer system, and an arithmetic processing unit that performs overall control of these. A timer section monitors the time from issuance to a text report request, and when a text sent by the other party's communication control device is received, a reception request interrupt is issued to the own main computer and the timer section is activated. 1. A communication control system, characterized in that the program storage unit is provided with a program that determines that the computer is abnormal and transmits a response indicating that the main computer is abnormal to the text sending side. 2. The communication control system according to claim 1, wherein a timer unit for monitoring the time from issuance of a reception request interrupt to a text report request can be set programmably. 3. A communication control system according to claim 1, in which a communication control program including a program for handling an abnormality in the main computer can be written from the main computer. 4. The method of manufacturing a communication control device according to claim 1, wherein the communication control device implementing the communication control method is mounted on a printed wiring board. 5. An instrumentation system that performs process control by connecting computer systems with distributed functions, characterized in that information necessary for driving, operating, monitoring, etc. of the process is exchanged by the communication control method of claim 1. Communications system.