JPH04336734A - Fault diagnostic method for on-line system - Google Patents

Abstract

PURPOSE:To automatically diagnose a fault just after the fault takes place without manual intervention. CONSTITUTION:A means having its own number and a mode setting table 8 in a MODEM, setting the MODEM 5 to the data loopback mode according to a command when a command from a computer 1 is a command to its own equipment and sending a test data in succession to the command with loopback and a control means releasing the loopback mode are used to set and release the loopback mode for the computer 1 via a communication line 7.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for diagnosing an abnormality in an online system.

0002

2. Description of the Related Art Conventionally, when an abnormality occurs in a communication line, a method for diagnosing an abnormality in this type of online system involves manually setting a switch in a modem device to loopback mode, and then sending test data from a computer. After diagnosing the communication line, the user operates the modem switch again to cancel callback mode. This conventional checking method is carried out as follows according to the procedure shown in the flowchart of FIG.

First, when the computer detects an abnormality in the communication line (step 301), the computer outputs a failure message to the printing device (step 302). The computer operator sets the switch of a nearby modem device connected to the computer to callback mode (step 303). Next, test data is sent from the computer to the modem device (step 304). When the modem device receives test data from the computer, it returns the test data to the computer. When the computer receives test data from the modem device (step 305), it compares the sent data with the received data (step 306).
). If the data do not match, or if the sent data is not returned, an error message is output to the printing device (step 307).

[0004] When the data match, the return switch of the modem device is returned to its original state (step 308). Next, the switch of the other party's modem device connected via the communication line is set to loopback mode (step 309). Test data is sent from the computer (step 310), and the computer receives the test data returned by the modem device. This received data is compared with the sent data (step 311).
), if they do not match, or if the data is not returned, an error message is output to the printing device (step 3).
12). If they match, return the return switch of the modem device to its original position (step 313). Communication lines are diagnosed using such procedures.

[0005]

[Problems to be Solved by the Invention] In the conventional online system abnormality diagnosis method described above, the operator first sets the switch of a nearby modem device to callback mode, and then sends test data from the computer. Turn the modem device switch back on. Next, the switch on the remote modem device is set to loopback mode, test data is sent, and diagnosis is performed in order from the closest modem device, which requires a lot of manual intervention. Additionally, due to manual intervention, switches may be pressed incorrectly.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for diagnosing an abnormality in an online system, which eliminates the above-mentioned drawbacks, eliminates manual intervention, and diagnoses a communication line immediately when an abnormality occurs.

[0007]

[Means for Solving the Problems] The online system abnormality diagnosis method of the present invention has a self-number and mode setting table in the modem, and when a command from a computer is a command for the self-device, the modem device is configured to perform data according to the command. The control means is connected to a computer via a communication line, and is connected to a computer via a communication line to set and cancel the return mode. Features.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a flowchart showing one embodiment of the present invention.

FIG. 2 is a block diagram showing an apparatus to which the embodiment of FIG. 1 is applied. This device includes a computer 1,
Disk device 2, printing device 3, and multiplex communication control device 4
, a modem device 5 , a modem device 6 , a communication line 7 ,
It includes a mode setting table 8 and a mode setting table 9.

Referring to FIG. 1, when a message is input (step 101), it is compared with the mode setting table 8 in the modem device (step 102), and if they match (steps 103 and 104), the modem device 5 is set to callback mode. (Step 106). The computer 1 transmits the test data, loops back the modem device 5, and compares it with the test data returned. If they match, the computer 1 checks the modem device 6. The computer 1 sends a mode setting command to cancel the loopback mode of the modem device 5. Send message A2. Modem device 5 receives mode setting command message A2 (step 101). Compare A2 with the modem device internal mode setting table 8 (step 102), and if they match (
Steps 103, 104, 105) Release the loopback mode of the modem device 5 (Step 107).

[0012] If the test data do not match, or if the sent test data is not returned, it is determined that the modem device 5 is abnormal.

If the modem device 5 is normal, the computer 1 sends a mode setting command message B1 for returning the modem device 6. When the modem device 5 receives the mode setting command message B1 (step 101), it compares B1 with the mode setting table 8 in the modem device (step 102), and since they do not match, it sends the command message to the modem device 6 as is. When the modem device 6 receives the mode setting command message B1 (step 101), the modem device 6 receives the mode setting command message B1.
and the modem device internal mode setting table 9 (step 102), and if they match (steps 103, 104), the modem device 6 is set to loopback mode (step 106).
). The computer 1 transmits the test data, loops back to the modem device 6, compares the returned test data with the sent test data, and if they do not match or the test data is not returned, the computer 1 returns the modem device 6 to the communication line 7 or the modem device. 6 is abnormal, and the situation is recorded in the printing device 3.

[0014]

[Effects of the Invention] As explained above, according to the present invention,
When an abnormality occurs in the communication line, by setting the modem to loopback mode using a message from the computer, it is possible to automatically diagnose the abnormality immediately after it occurs without any manual intervention.

[Brief explanation of drawings]

FIG. 1 is a flowchart of an embodiment of the present invention.

FIG. 2 is a configuration diagram of an apparatus to which the method of FIG. 1 is applied.

FIG. 3 is a flowchart of a conventional example.

[Explanation of symbols]

1 Computer 2 Disk device 3 Printing device 4 Multiplex communication control device 5 Modem device 6 Modem device 7 Communication line 8 Mode setting table 9 Mode setting table

Claims (1)

[Claims] Claim 1: The modem has a self-number and mode setting table, and when a command from a computer is a command for the self-machine, the modem device is set to a data loopback mode according to the command, and the test data following the command is looped back. A method for diagnosing an abnormality in an online system, characterized in that the method executes a transmitting means and a control means for canceling a callback mode, is connected to a computer via a communication line, and sets and cancels the callback mode.