JPH02144747A - Detecting system for fault of terminal equipment - Google Patents

Abstract

PURPOSE:To prevent the system breakdown and to minimize the influence of a circuit fault by displaying the position of a faulty terminal to each terminal and specifying the faulty terminal to separate it from the system when the circuit fault occurs. CONSTITUTION:A reading part 1a reads the state of an RSi or RS0 when a terminal controller TC 100b detects a circuit fault and outputs a session break command. A deciding part 2a decides a fault of the circuit, the signal line or the connector related to the RS and CS signals of its own station or a lower rank terminal in the case of (RS0, RSi) = (0, 1) and its own station and a higher rank terminal in the case of (RS0, RSi) = (1, 1) respectively based on the states (logic 0 or 1) of the RSi and RS0 which are read by the part 1a. Then a display part 3a displays a message showing the position of the faulty terminal based on the decision of the part 2a.

Description

[Detailed Description of the Invention] [Summary] Regarding a failure detection method for a terminal device connected to a host device such as a terminal control device in a multi-drop manner, a terminal that can easily detect a failed terminal among terminals connected in a multi-drop manner The present invention aims to provide a device detection method in a data transfer system in which a plurality of terminal devices are multi-drop connected to a higher-level device using an interface signal, a means for collecting state information of the interface signal in the terminal device; means for determining, based on the information collected by the collecting means, whether the location of the failed terminal device is higher or lower than the terminal device in a connection order with a host device; and means for displaying the determination result of the determining means; established,
The device is configured to detect a malfunctioning terminal device based on the display on the display means of the plurality of terminal devices.

[Industrial application field]

The present invention relates to a failure detection method for a terminal device that is multi-drop connected to a host device such as a terminal control device.

In recent years, for the purpose of effective use of lines and saving on line charges,
Multi-drop connections, which connect multiple terminal devices to one terminal control device etc. via a common signal line, are widely used. Failures and failures can paralyze the data transfer functions of all terminal devices and cause system failure.Therefore, in order to minimize system failure by disconnecting the failed terminal device as soon as possible, There is a need for a failure detection method for terminal devices that can easily detect failures.

[Conventional technology]

In the conventional terminal failure detection method, an engineer with specialized knowledge checks logging information, trace data, etc. recorded in the terminal to determine the failure.

[Problem to be solved by the invention]

As mentioned above, according to the conventional method, a specialized engineer determines a malfunctioning terminal based on logging information, etc., so it is difficult for users who do not have specialized knowledge to identify a malfunctioning terminal.
There was a problem in that it took time to restore the system and business operations were stopped for a long time.

An object of the present invention is to provide a terminal device detection method that can easily detect a failed terminal among terminals connected in a multi-drop connection.

[Means to solve the problem]

FIG. 1 shows a block diagram of the principle of the present invention.

In the figure, 100 is a host device, 10 is a plurality of terminal devices multi-drop connected to the host device 100 by an interface signal, 1 is a means provided in the terminal device 10 and collects state information of the interface signal, and 2 is a collection means. means for determining whether the location of the failed terminal device is higher or lower than the terminal device in the connection order with the host device based on the information collected by step 1, and means 3 for displaying the determination result of determination means 2; The device is configured to detect a failed terminal device based on.

[Effect]

According to the present invention, in the terminal device 10, the determining means 2 determines, based on the state information of the ink face signal collected by the collecting means 1, that the position of the failed terminal device 10 is determined by the terminal device in the connection order with the upper device. Since the display means 3 displays the determination result of the determination means 2, a failed terminal device IO can be detected by combining the display contents of the display means of the plurality of terminal devices 10. be able to.

〔Example〕

Hereinafter, embodiments of the present invention will be described using a group polling system as an example with reference to FIGS. 2 to 4. The same reference numerals indicate the same objects throughout the figures.

Components in FIG. 2 that correspond to those in FIG. 1 are surrounded by dashed lines.

In the configuration of the group polling system shown in Figure 4,
Terminal controller (hereinafter referred to as TC) 100
a is connected to a host device (not shown), and a plurality of terminals (Tll to T1m, T21 to T2
n...). In the message format shown in Figure (b), the T C 100a specifies a polling command in the control field, polls by group (for example, group 1) in the address field, and prioritizes terminals within the group according to the connection order with the T C 100a. A terminal that has a transmission message and has a transmission message transmits the message according to its priority, and the last terminal (for example, Tl of group 1)
m) is the last terminal in the group with the F bit (not shown) turned on in the control field (
It responds with a terminal response). Here, TClooa detects a line failure based on a terminal response time monitoring error and other communication errors for group polling,
A low-level session disconnection command is issued to disconnect the logical connection with the terminal.

In the block diagram of the embodiment of the present invention shown in FIG. 2, the T C 100b includes transmission data (SD) that transmits bit-serial data to a terminal, reception data (RD) that transmits bit-serial data from the terminal, and a terminal. The terminals (11, 12, 1
3) to perform communication.

The terminal 12 will be explained below as a representative. R from lower terminal
3 signal is input to the terminal 12 (R3i) and is a data transfer request (R3i) that turns on when group polling is received.
o) and TCl as R3 (OR circuit 5a).
oob. The transmission permission signal C3 from the T C 100b is input to the terminal 12 (C3i), and the output (C3o) of the logical product (AND circuit 6a) with the negation of R3o is C3o.
8 and is transmitted to the lower terminal. Therefore, when the C3 signal is input, a terminal that has a data transfer request suppresses the transmission of the C3 signal, does not provide transmission to lower terminals, and transmits the TC.
It is configured to execute data transfer with loob, turn off R3O after the data transfer, and transmit C3 to the lower terminal.

The reading unit 1a reads the states of R3i and R3O when the TC 100b detects a line failure and outputs a session disconnection command.

The determination unit 2a determines the R3o read by the reading unit 1a.
and based on the state of R3i (logical O or l) (R3o
, R3i) = (0, 1), the circuit related to the R3 and C3 signals of the local station or the lower terminal, and when (R3o, R31) = (1, 1), the circuit related to the R3 and C3 signals of the local station or the upper terminal, It is determined that there is a fault in the signal line or connector.

The display unit 3a displays a message indicating the location of the failed terminal on the display based on the determination by the determination unit 2a (third
(see figure).

FIG. 3 shows an example of application of the present invention, and FIG. 3(a) shows terminal C's
For example, a case is shown in which a failure occurs in the C3 signal control system. For group polling, all terminals are R3o
The C3 signal from TClob (not shown) is sequentially transmitted to terminals A, B, and C, but is not transmitted to terminals after that, and terminals turn R3o on (or 1). keep it as it is. The TC 100b detects a line abnormality due to a timeout error in the termination response, and issues a session disconnection command to all terminals. Each terminal collects the status of R3o and R3i and displays the message shown in FIG. 12(b) according to the combination.

Therefore, users can prevent system failure by disconnecting the two terminals (C and D in the example) at the point where the message content changes, or by alternately connecting the two terminals and disconnecting the identified faulty terminal. .

Also, in Figure (C), in addition to R3i and R5o, C3i
An example will be shown in which the states of the C3o and C3o signals are also collected and determined, and by making determinations based on more control signals, it becomes possible to specify a failed terminal in more detail.

〔Effect of the invention〕

As explained above, according to the present invention, when a line failure occurs, the location of the failed terminal is displayed on each terminal.
Even an operator without specialized knowledge can easily identify a failed terminal and disconnect it from the system to continue online operation, which has the effect of preventing system failure and minimizing damage.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, FIG. 3 is an application example of the present invention, and FIG. 4 is a side view of the configuration of a group polling system. In the figure, 1 is a collection means, 1a is a reading section, 2 is a judgment means, 2a is a judgment section, 3 is a display means, 3a is a display section, 5a is an OR circuit, 6a is an AND circuit, 10 is a terminal device, 11. 12.13 indicates a terminal, 100 indicates a host device, and 100b indicates a terminal controller. (TC) “R of the present invention” Sato Pro, Tsuku Map No. 1 (2)

Claims (1)

[Claims] In a data transfer system in which a plurality of terminal devices (10) are multi-drop connected to a host device (100) via an interface signal, status information of the interface signal is collected in the terminal device (10). means (1), and determining whether the position of the failed terminal device (10) is higher or lower than the terminal device (10) in the connection order with the host device based on the information collected by the collecting means (1); and a means (3) for displaying the determination result of the determining means (2), the terminal device being malfunctioning based on the display of the displaying means (3) of the plurality of terminal devices (10). (10) A failure detection method for a terminal device, characterized in that it detects.