JPH01118939A - Health check system for remote supervision system - Google Patents

Abstract

PURPOSE:To effectively check the defect of a transmission circuit of a terminal equipment, the loss of the telephone number of a transmission receiver by securing such a constitution where the terminal equipment which received an inquiry signal for health check from a center equipment cuts a circuit once and then connects the circuit to the center equipment by itself to transmit an answer signal for health check. CONSTITUTION:A center equipment 1 containing a health check function is used together with plural terminal equipments 2 scattered at plural points, and a subscriber telephone exchange network 3. The equipment 2 that received the inquiry signal for health check sent from the equipment 1 cuts a circuit once and then connects the circuit to the equipment by itself for transmission of an answer signal for health check. Therefore the information on the defect of a transmission circuit of the equipment 2, the loss of the telephone number of a transmission receiver, etc., are superposed on the answer signal in the form of the distortion of a signal waveform, a timing error, etc. In such a way, the health check of each equipment 2 is carried out in an easy and perfect way.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a health check method for a remote monitoring system, and particularly to a health check method for a remote monitoring system that checks the functionality of a terminal device via a subscriber telephone line. Regarding.

[Conventional technology]

This type of health check system that has been practiced in the past is started by outputting a health check inquiry signal from a center device to a terminal device via a subscriber telephone line. A method has been adopted in which the terminal device that receives this inquiry signal transmits a response signal while the subscriber telephone line is connected.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional example, since the terminal device responds with the subscriber telephone line connected, it is possible to check whether the terminal device operates or not. However, there is a problem in that it is not possible to check for malfunctions in the calling circuit of the terminal device, loss of the destination telephone number, etc.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a health check system for a remote monitoring system that can improve the disadvantages of the conventional system and effectively check the connection status of lines, transmission circuits, etc.

[Means for solving problems]

In the present invention, a remote monitoring system includes a center device with a health check function and a plurality of terminal devices connected to the center device via telephone lines, and the terminal devices respond to inquiry signals from the center device. In the health check method, in response to a health check inquiry signal output from the center device, the terminal device that receives this disconnects the line, connects to the center device itself, and sends a health check response signal. The system uses a configuration in which the following information is sent. This aims to achieve the above-mentioned purpose.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

The embodiment shown in FIG. 1 includes a center device 1 equipped with a health check function, a plurality of terminal devices 2 scattered in various places, and a subscriber telephone exchange provided between the center device 1 and the terminal devices 2. m3.

When the center device 1 performs a health check on the terminal device 2, the center device 1 first establishes a line connection with the terminal device 2 using the subscriber telephone switching network 3, and sends a health check inquiry signal. Next, after receiving this inquiry signal, the terminal device 2 connects the -degree line, and then the terminal device 2 returns a response signal to the center device 1 within a certain period of time after sending the health check inquiry signal. A health check will be performed depending on whether the

〔Effect of the invention〕

As explained above, according to the present invention, before the terminal device transmits a health check response signal, the terminal device disconnects the line twice and connects itself to the line, thereby detecting the location of the terminal device's connection failure or the originating line failure. Alternatively, information related to the loss of the destination phone number, etc. may be superimposed on the response signal in the form of signal waveform distortion or timing deviation, and as a result, the center equipment side may not be able to respond to the response signal based on the sent signal. 1
Accordingly, it is possible to provide a health checker method of a remote monitoring system that is unprecedented and excellent in that it is possible to perform health analysis, that is, health check of each terminal device easily and almost completely.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1------ Center device, 2...Terminal device,
3...: Incoming telephone exchange network. Patent applicant: Japan Electric Co., Ltd., agent: patent attorney Takahashi

Claims (1)

[Claims] (1) A remote monitoring system comprising a center device with a health check function and a plurality of terminal devices connected to the center device via telephone lines, where the terminal devices respond to inquiry signals from the center device. In the health check method, the terminal device that receives the health check inquiry signal output from the center device disconnects the line, connects to the center device itself, and sends the health check response signal. A health check method for a remote monitoring system characterized by transmitting.