JPH01272346A - Diagnosis communication system - Google Patents

Abstract

PURPOSE:To reduce the number of inputs/outputs between a central processing unit and a communication control equipment into a half and to reduce the load of software required for diagnosis by properly determining the sending of a command frame and a response frame. CONSTITUTION:Receiving a transmission command from a central processing unit 111, a communication control equipment 131 sends a command frame to a communication line 20. A communication control equipment 132 receives the command frame, sends an asynchronizing report to a central processor 112, and at the time of receiving a transmission command from the processing unit 112, sends a response frame and its following command frame to the line 20. At the time of successively receiving the response frame and the command frame, the equipment 131 sends the response frame to the line 20 to inform the end of the transmission command to the unit 111. The equipment 132 receives the response frame and informs the end of the transmission command to the unit 112.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is utilized in a diagnostic communication system for a hot standby computer system whose main purpose is online business. In particular, multiple operating systems (hereinafter referred to as O8)
That's what it means. ) relates to a diagnostic communication method for performing diagnosis between

[ヰAlready required]

The present invention provides a diagnostic communication system in which one communication control device receives a first transmission command from one central processing unit and sends a first command frame to a communication line, and the other communication control device sends a first command frame to a communication line. Upon receiving the command frame, it sends an asynchronous report to the other central processing unit, and upon receiving the second transmission command from the other central processing unit, sends the first response frame and subsequently the second command frame to the communication line. , when one communication control device receives this first response frame and this second command frame in order, it sends the second response frame to the communication line and issues the first transmission command to one central processing device. The other communication control unit receives this second response frame and reports the completion of the second transmission command to the other central processing unit, thereby establishing a connection between the central processing unit and the communication control unit. The number of inputs and outputs can be halved, and the software load required for diagnosis can be reduced.

[Conventional technology]

FIG. 3 is a diagram showing a communication procedure of a conventional diagnostic communication device.

Conventionally, diagnostic communication methods have taken steps as shown in FIG.

That is, the central processing unit (hereinafter referred to as CPU) 11
, transmits and receives a command frame I to and from the other party CP Ull2 via two logical channels, a transmission channel and a reception channel, to the communication control unit (hereinafter referred to as CCU) 13, thereby transmitting and receiving command frames I to the other party CP Ull,
Diagnosis was performed to confirm the normality of the equipment.

[Problem that the invention seeks to solve]

However, in such a conventional diagnostic communication method, communication is performed via two logical channels, so CPULL and c
c Between U13+ and CP Ull2 and CCU
13□ has the disadvantage that two input/output operations are required for each input/output operation.

In addition, input/output requests for diagnosis and input/output requests for normal communication are handled by an application program (hereinafter referred to as A
It's called P. ) had the disadvantage of competing at the level of

The present invention solves the above-mentioned drawbacks, and aims to provide a diagnostic communication method that can reduce the number of inputs and outputs between the central processing unit and the communication control device by half, and reduce the software load required for diagnosis. purpose.

[Means for solving problems]

The present invention provides a diagnostic communication method that includes two central processing units, two communication control devices respectively connected to these two central processing units, and a communication line connecting these two communication control devices. The central processing unit includes means for outputting a first transmission command, and one communication control device includes means for receiving the first transmission command and transmitting a first command frame to the communication line, The other communication control device includes means for receiving the first command frame and providing an asynchronous report to the other central processing device, and the other central processing device receives the asynchronous report and issues a second transmission command. The other communication control device includes means for receiving the second transmission command and transmitting a first response frame and subsequently a second command frame to the communication line; One of the communication control devices includes means for transmitting the first response frame and the second command frame 4 to the communication line when received by the WO 1111, and a means for transmitting the second response frame to the communication line. the other communication control device receives the second response frame and sends a completion report of the second transmission command to the other central processing unit. characterized in that it includes means for providing to the device.

[Operation] One central processing unit outputs a first transmission command to one communication control device. One of the communication control devices receives this first transmission command and sends out a first command frame to the communication line. The other communication control unit receives this first command frame and provides an asynchronous report to the other central processing unit.

The other central processing unit receives this asynchronous report and outputs a second transmission command. The other communication control device receives this second transmission command and sends out a first response frame and subsequently a second command frame to the communication line. When one communication control device receives this first response frame and this second command frame in order, it sends a second response frame to the communication line, and sends a completion report of the first transmission command to one side. to the central processing unit. The other communication control device receives this second response frame and gives a report of completion of the second transmission command to the other central processing device. By the above operation, the number of inputs and outputs between the central processing unit and the communication control device can be halved, and the software load required for diagnosis can be reduced.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings. 1st
The figure is a block diagram of a diagnostic communication device according to an embodiment of the present invention. In FIG. 1, the diagnostic communication device includes two CPUs.
llo, 112 and these two CP Ull, , 1
12 have human output interfaces 12, , 12□, respectively.
The two CPUs 111 and 132 are connected via the CCU l3. ．． Communication line 20 connecting 132
Equipped with.

Here, the feature of the present invention is that the transmission method is now set to CP.
UII, and ccU13+, and the receiving power is CPU
ll2 and CCUl32, cpUIL is
CCU 131 includes means for outputting a first transmission command;
includes means for receiving this first transmission command and transmitting the first command frame 11 to the communication line 20, and the CCU 13
2 includes means for receiving this command frame (1) and providing an asynchronous report to the CPU 112, the CPU 112 includes means for receiving this asynchronous report and outputting a second transmission command, and the CCU 132 receives this second transmission command. CCUI:L includes means for receiving a first response frame ACP and subsequently sending a second command frame I2 to the communication line 20;
+ and this command frame I2 are received in order, the second response frame ACP2 is sent to the communication line 20.
and means to send the first transmission command completion report to the CPU
CCUl:b includes means for receiving this response frame ACP2 and providing a report of completion of the second transmission command to Cp Ull□.

The operation of the diagnostic communication device having such a configuration will be explained.

The features of the present invention are how to issue commands to both CPU II, , 11□, and both CCU 13. ．． 13□ How to send frames on the communication line 20. The basic principle of exchanging frames on the communication line 20 is that when the transmitter sends a command frame to the receiver, the receiver returns a response frame or not.
The next command frame is issued only when there is no response within a specified time. Furthermore, since the presence of a relay station in the middle of the communication line 20 is generally allowed, confirmation of the transmission method and reception power must not be made using only a response frame. In other words, it is necessary to interpret that an acknowledgment is obtained only after command frames are exchanged.

FIG. 2 is a diagram showing the communication procedure of the diagnostic communication device of the present invention. In FIGS. 1 and 2, the application program issues a first transmission command to CCU 131. C.C.
U 131 transmits command frame 1 on the communication line 20.
Sends 1. CCU13□ is command frame 11
When it receives this, it issues an asynchronous report to that effect to the CPU 112.

The CPU 111 issues a second transmission command to the CCU132.

Upon receiving the first transmission command, the CCU 13□ transmits a response frame ACP.

Subsequently, the CCU 13□ sends out the command frame I2. CCU 131 is a response frame AC
A response frame ACP2 is sent onto the communication line 20 only when P and a command frame I2 are received in that order. The CCU 131 reports the completion of the first transmission command to the CPU 111. Here, the point to note about the operation of ccU13+ is that only when CC1J13° receives response frame A CP I'Js and command frame E2 in that order, does response frame ACP2
is returned, and if there is a relay station in the middle of the communication line 20, just receiving the response frame ACP,
The point here is that the only meaning is that the command frame I has arrived at the relay station. That is, by receiving the command frame I2, the CCU 131 can recognize for the first time that there has been a legitimate response from the CCU 13□.

〔Effect of the invention〕

As described above, the present invention has the excellent effect of being able to perform diagnosis using only one logical channel and reducing the number of input/outputs by half.

Therefore, the software processing of the application program and the operating system can be reduced, and there is an advantage that the shorter the diagnosis is performed, the lower the software overhead required for the diagnosis.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a diagnostic communication device according to an embodiment of the present invention. FIG. 2 is a diagram showing a communication procedure of the diagnostic communication device of the present invention. FIG. 3 is a diagram showing a communication procedure of a conventional diagnostic communication device. 11. 112...Central processing unit (CPU), 1
2+, 122...I/O interface, 13□, 1
32... Communication control unit (CCU), 20... Communication line, ACP, ACP,, ACP,... Response frame, IS I. I2...Command frame.

Claims (1)

[Claims] 1. Diagnostic communication comprising two central processing units, two communication control devices respectively connected to these two central processing units, and a communication line connecting these two communication control devices. In this method, one central processing unit includes means for outputting a first transmission command, and one communication control device receives the first transmission command and transmits a first command frame to the communication line. and the other communication control device includes means for receiving the first command frame and providing an asynchronous report to the other central processing unit, and the other central processing unit receiving the asynchronous report and providing a second command frame. The other communication control device includes means for outputting a transmission command, and the other communication control device receives the second transmission command and transmits a first response frame and subsequently a second command frame to the communication line. said one communication control device includes means for sending a second response frame to said communication line when receiving said first response frame and said second command frame in order; and means for providing a report of the completion of the transmission command to the one central processing unit, wherein the other communication control device receives the second response frame and transmits the completion report of the second transmission command to the other central processing unit. A diagnostic communication method comprising means for providing to a processing device.