JP3431516B2 - Information transmission system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information transmission system for transmitting / receiving a transmission / reception signal between a plurality of transmission devices via a communication path such as a communication line, and particularly to a transmission error when a transmission error occurs. The present invention relates to an information transmission system that promptly discovers the cause of an error and recovers a transmission abnormality early.

[0002]

2. Description of the Related Art Conventionally, as an information transmission system for exchanging information between a plurality of transmission devices via a communication line,
The information transmission system shown in FIG. 3 is known.

The information transmission system 101 shown in this figure is
A plurality of transmission devices 102 having a trace function and a communication line 103 connecting each of these transmission devices 102 are provided, and transmission / reception signals are exchanged between the transmission devices 102 via the communication line 103.

Then, an abnormality occurs in the transmission / reception signal transmitted / received between the respective transmission devices 102, and the respective transmission devices 102.
When either of these is detected, the trace function is used to start storing the transmission / reception signal obtained by the transmission / reception operation, and the cause of the transmission abnormality is investigated based on the transmission / reception history of the transmission / reception signal obtained by this. To do.

[0005]

By the way, in such an information transmission system 101, when a transmission abnormality occurs, a trace function provided in the transmission device 102 which has detected the transmission abnormality is used to obtain the transmission / reception operation. Since the contents of transmitted and received signals are traced to investigate the cause of transmission abnormalities, when transmission abnormalities that occur infrequently, or transmission abnormalities that recover in an instant occur, the cause of these transmission abnormalities There was a problem that it was difficult to find.

Therefore, in order to solve such a problem,
Conventionally, as shown in FIG. 4, when a transmission abnormality is detected, the trace function of each transmission device 101 traces the content of a transmission / reception signal to narrow down the communication procedure that is presumed to be the cause of the transmission abnormality, and The program is rearranged so as to generate a trigger signal when a communication procedure that becomes
A transmission analyzer device 104 is connected to the transmission analyzer device 104, and the transmission analyzer device 104 constantly captures and stores the transmission / reception signal transmitted / received by the transmission device 102, and when the transmission device 102 outputs a trigger signal, the transmission analyzer device 104 In many cases, the cause of the transmission abnormality is investigated by stopping the process of capturing the transmission / reception signal and starting the cause analysis of the transmission abnormality.

However, in such an abnormality cause analysis method, every time any one of the transmission devices 102 detects a transmission abnormality, the trace function is used to narrow down the causes of the transmission abnormality, For each cause, after the communication procedure in the communication procedure in which it is estimated that a transmission abnormality will occur, a program for generating a trigger signal must be installed, and the work of collecting transmission / reception signals must be repeated, There is a problem that it takes too much time and effort to find the cause of the transmission abnormality.

Further, the information transmission system 101 shown in FIG.
As another method for finding out the cause of the transmission abnormality that occurs in step 1, as shown in FIG. 5, the transmission analyzer device 111 having a function of detecting the occurrence of the transmission abnormality is used to detect the cause of the transmission abnormality. A method of analyzing has also been proposed (JP-A-4-369047).

In the method shown in FIG. 5, when a transmission / reception signal matching a trigger condition registered in advance in the buffer selection circuit is input, the transmission / reception signal input is held until the transmission / reception signal is input. The transmission / reception signal can be analyzed later to investigate the cause of the trigger condition.

However, in the method in which the transmission analyzer device 111 as described above is used to hold the transmission / reception signals collected until the transmission abnormality occurs, and then analyze the transmission / reception signal to find the cause of the transmission abnormality. It is necessary to determine in advance what kind of signal the transmission / reception signal is, and determine the transmission abnormality, and register the trigger condition in the buffer selection circuit based on the content of this determination.

At this time, if the number of transmission abnormality determination conditions registered in each transmission device 102 is set to be smaller than the number of trigger conditions registered in the buffer selection circuit, each transmission device 1
02, the transmission analyzer device 111 determines that the transmission abnormality is greater than the number of times that the transmission analyzer device 111 determines that the transmission abnormality occurs, and the transmission analyzer device determines that the transmission abnormality has occurred. 1
Even if the transmission / reception signal including the contents at the time of transmission abnormality in 11 is once held, when a temporary abnormality occurs in the transmission / reception signal transmitted / received between the transmission devices 102 after this, the next signal registered in the buffer selection circuit is registered. There is a problem that the trigger condition is immediately satisfied and the transmission / reception signal already held is rewritten.

On the contrary, if the number of transmission abnormality determination conditions registered in each transmission device 102 is set to be larger than the number of trigger conditions registered in the buffer selection circuit, each transmission device 102 is set.
Even if it is determined that the transmission is abnormal, the trigger condition of the transmission analyzer device 111 is not satisfied, and the transmission / reception signal necessary for analyzing the cause of the transmission abnormality cannot be held.

Therefore, when such a transmission analyzer device 111 is used, the transmission abnormality determination condition of each transmission device 102 and the trigger condition of the transmission analyzer device 111 must be completely matched, and each transmission There is a problem that the program of the device 102 cannot be individualized.

In view of the above circumstances, it is an object of the present invention to provide an information transmission system capable of early finding the cause of transmission abnormality even with a simple system configuration.

[0015]

In order to achieve the above-mentioned object, the present invention according to claim 1 produces transmission abnormality occurrence information when they are mutually connected by a communication path and a transmission abnormality is detected. A plurality of transmission devices having an abnormality information output means for transmitting on the communication path, and installed on the communication path,
Until the transmission abnormality occurrence information is output from each of the transmission devices to the communication path, the transmission / reception signal sent to the communication path is captured and stored, and when the transmission abnormality occurrence signal is output to the communication path, It is characterized by including an analysis device for starting the analysis processing based on the transmission / reception signals captured up to and finding the cause of the transmission abnormality.

According to a second aspect of the present invention, in the information transmission system according to the first aspect, when the transmission abnormality information output means does not cancel the transmission abnormality even after trying a retry process to determine whether the transmission abnormality is canceled. Only in this case, it is determined that a transmission abnormality has occurred, transmission abnormality occurrence information is generated and transmitted to the communication path.

With the above arrangement, in the first aspect, the transmission abnormality information output means generates the transmission abnormality occurrence information and sends it to the communication path when the transmission abnormality is detected. The analysis device captures and stores the transmission / reception signal sent on the communication path until the transmission error occurrence information is output from each transmission device, and when the transmission error occurrence information is output on the communication path, The analysis process is started based on the transmission / reception signals captured so far to find the cause of the transmission abnormality. As a result, when a transmission error occurs in any of the transmission devices, the analysis device stops the process of capturing the transmission / reception signal and starts the analysis of the transmission / reception signal that has already been stored, so that the cause of the transmission error can be promptly detected. Let me find it.

In claim 2, the transmission abnormality information output means is
Only when the transmission abnormality is not canceled even if the transmission abnormality is canceled by performing the retry process, it is determined that the transmission abnormality has occurred, the transmission abnormality occurrence information is generated and transmitted to the communication path. As a result, when a transmission error that does not recover even if retry processing is performed by any of the transmission devices occurs, the analysis device stops the acquisition process of the transmission / reception signals and starts analysis of the transmission / reception signals already stored. Then, the cause of the transmission abnormality is found early.

[0019]

1 is a block diagram showing an embodiment of an information transmission system according to the present invention.

The information transmission system 1 shown in this figure has a plurality of transmission devices 2 having a trace function, a communication line 3 connecting these transmission devices 2, and a communication line 3 connected between the transmission devices 2. When the transmission abnormality signal indicating that the transmission abnormality is detected is output from any one of the transmission devices 2 to the communication line 3 while the transmission / reception signal transmitted / received by the transmission / reception signal is stored, the transmission / reception signal is transmitted. And the transmission analyzer device 4 which finds the cause of the transmission abnormality by starting the analysis of the transmission / reception signals that have been captured and stored by then. Particularly, the transmission device 2 in this embodiment is provided with the transmission abnormality information output means, and when the transmission abnormality is detected, the transmission abnormality occurrence information is generated and sent to the communication line 3, and the transmission abnormality is detected. When the transmission is restored, transmission restoration information indicating that the transmission abnormality has been restored is generated and sent to the communication line 3.

Next, the operation of this embodiment will be described.
When transmission / reception signals are transmitted / received between the transmission devices 2 via the communication line 3, the transmission analyzer device 4 captures the transmission / reception signals transmitted / received between the transmission devices 2,
This is sequentially stored in the FIFO format.

In this state, when an abnormality occurs in a transmission / reception signal transmitted / received between the transmission devices 2 and this is detected by any of the transmission devices 2, a retry process is performed as shown in the flowchart of FIG. It starts and transmits a retry signal to the transmission device 2 that is the communication destination, and causes the portion in which the transmission error has occurred to be retransmitted and rereceived (step ST
1).

At this time, if the transmission abnormality is not canceled even after performing such retry processing a predetermined number of times (step ST2), the transmission abnormality indicating that the transmission abnormality has occurred is caused by the transmission device 2 which has detected the transmission abnormality. Occurrence information (for example, information such as error code: ERR-00) is generated and sent to the communication line 3. As a result, the transmission device 2 serving as the communication destination is notified that the transmission abnormality does not disappear even after performing the tri-write process, the useless transmission / reception processing is stopped, and the transmission analyzer device 4 is notified that the transmission abnormality has occurred. Yes (step ST3).

Next, the transmission analyzer device 4 stops the transmission / reception signal acquisition processing and starts the analysis processing of the transmission / reception signals acquired up to that point, that is, the transmission / reception signals transmitted / received at the time of transmission abnormality, and finds the cause of the transmission abnormality. When this happens, let the operator, etc., take appropriate action depending on the cause of the transmission error.

Then, when the transmission abnormality is recovered and is detected by the transmission device 2 which has detected the transmission abnormality (step ST4), transmission restoration information indicating that the transmission abnormality has been restored (for example, return code: (Information such as ERR-REC) is generated and transmitted to the communication line 3 to notify the transmission device 2 serving as a communication destination that the transmission abnormality has been recovered, and the transmission / reception process is restarted. 4 is notified that a transmission error has occurred, and the process of fetching the transmission / reception signal and the storage process are restarted (step ST
5).

As described above, in this embodiment, even if the transmission abnormality is canceled by any one of the transmission devices 2 and the transmission abnormality is canceled, the transmission is not performed. It is determined that an abnormality has occurred, transmission abnormality occurrence information is generated based on this determination result, this is transmitted to the communication line 3, and the transmission / reception signal acquisition processing and storage processing exchanged between the respective transmission devices 2 are performed. The transmission / reception signal acquisition process of the transmission analyzer device 4 that is performing the above is stopped, the analysis process of the transmission / reception signal that has been acquired up to that point, that is, the transmission / reception signal that was transmitted / received at the time of the transmission error is started, and the cause of the transmission error is found At this point in time, the operator or the like is made to take action depending on the cause of the transmission abnormality, so even if a retry process is performed by any of the transmission devices 2. If you do not want to restore transmission error has occurred,
It is possible to cause the transmission analyzer device 4 to stop the process of fetching the transmission / reception signal, start the analysis of the transmission / reception signal already stored, and find the cause of the transmission abnormality early.

Further, in this embodiment, each transmission device 2
Is performed to determine whether or not a transmission abnormality has occurred, and the transmission / reception signal acquisition operation of the transmission analyzer device 4 is controlled based on the determination result. The cause can be found early.

[0028]

As described above, according to the present invention, a transmission / reception signal transmitted / received by each transmission device is always captured and stored, but a transmission error is not recovered even if a retry process is performed by any of the transmission devices. When the error occurs, the transmission / reception signal acquisition process is stopped and the stored transmission / reception signal is analyzed, whereby the cause of the transmission abnormality can be found early even with a simple system configuration.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an information transmission system according to the present invention.

FIG. 2 is a flowchart showing an operation example of the information transmission system shown in FIG.

FIG. 3 is a block diagram showing an example of a conventionally known information transmission system.

FIG. 4 is a block diagram showing a method for finding the cause of a transmission abnormality occurring in the information transmission system shown in FIG.

5 is a block diagram showing another method for finding the cause of a transmission abnormality that occurs in the information transmission system shown in FIG.

[Explanation of symbols]

1 Information transmission system 2 transmission equipment 3 communication lines 4 Transmission analyzer device (analysis device) 5 Transmission error information output means

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Claims (2)

(57) [Claims] 1. A plurality of transmission devices, each of which is connected to each other through a communication path and has abnormality information output means for generating transmission abnormality occurrence information and transmitting it to the communication path when a transmission abnormality is detected, and the communication. Installed on the road, the transmission / reception signal sent on the communication path is captured and stored until the transmission error occurrence information is output on the communication path from each transmission device, and the transmission error occurrence signal is output on the communication path. An information transmission system comprising: an analysis device that starts analysis processing based on the transmission / reception signals captured so far and finds the cause of the transmission abnormality. 2. The information transmission system according to claim 1, wherein the transmission abnormality information output unit does not cancel the transmission abnormality even if the transmission abnormality is not canceled even if the transmission abnormality is canceled by performing a retry process. An information transmission system, characterized in that it is determined that a transmission abnormality has occurred, transmission abnormality occurrence information is generated, and transmitted to the communication path.