JPH0376341A - Monitor - Google Patents

Abstract

PURPOSE:To send a monitor data at an optional time from an optional monitor device to a master monitor by providing a carrier control circuit so as to request line connection from the monitored device to the master monitor thereby stopping the transmission of a carrier. CONSTITUTION:When a monitor data is sent from a monitored equipment 21a, a carrier control circuit 4 stops a carrier of a MODEM 6 for a prescribed time to apply line connection request to a master monitor 1. Then a carrier detection circuit 7 of the monitor 1 detects the stop of a carrier of the monitor 21a to inform it to a monitor control circuit 3. The circuit 3 stops once the sequential normal monitor from the monitored device 21a to the device 2na, a line changeover circuit 5 selects the device 21a to output a call signal. Upon the receipt of a monitor data, the device 21a outputs a monitor data to the monitor 1. The monitor 1 receives the monitor data from the device 21a to apply sequential normal monitor to the devices 21a-2na again. Moreover, the propriety of the line is decided by detecting the stop of the carrier for a prescribed time or over at the circuit 7. Thus, the monitor data is optionally sent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a monitoring device, and particularly to a monitoring device that receives monitoring data from a plurality of remotely located monitored devices using a plurality of carrier waves.

[Conventional technology]

FIG. 2 is a block diagram of a conventional monitoring device. As shown in the figure, in this monitoring device, a plurality of monitored devices 21.21 to 2n and one main monitoring device 1 are connected to each other by a modem 6 via a communication line. The main monitoring device 1 also includes a monitoring control circuit 3 that sends a call signal to a selected monitored device, and monitored devices 21, 22 to 2n.
The monitored devices 21.22 to 2n are composed of a line switching circuit 5 that sequentially switches and selects the line of , and a modem 6.
Each modem 6 and a monitored control circuit 8 are configured.

On the other hand, the operation of this monitoring device is as follows: First, the line switching circuit 5 provided in the main monitoring device 1 sequentially selects 2n from the monitored device 21, and the monitoring control circuit 3 selects the call signal from the selected device. The monitored device sends the monitoring data to the main monitoring device 1 as a response signal, and the monitoring data is sent from the monitored device to the main monitoring device 1.
Now let's collect this monitoring data.

In addition, the monitored devices 21.21 to 2n always transmit carrier waves, and the carrier wave detection circuit 7 of the main monitoring device 1
It is used to detect the quality of the line connected by the circuit switching circuit 5.

[Problem to be solved by the invention]

In the conventional monitoring device described above, the line switching circuit 5 of the main monitoring device 1 sequentially selects the monitored devices 21, 22 to 2n and collects monitoring data. There is a drawback that when the monitoring device urgently wants to send monitoring data to the main monitoring device, the monitoring data cannot be sent until a call signal is received from the main monitoring device 1.

SUMMARY OF THE INVENTION An object of the present invention is to provide a monitoring device that eliminates such drawbacks.

[Means to solve the problem]

A monitoring device of the present invention includes a main monitoring device that monitors a plurality of monitored devices using a plurality of carrier waves and collects monitoring data of each of the monitored devices, wherein each of the monitored devices a carrier wave control circuit that requests a line connection from the monitored device to the main monitoring device and stops sending out the carrier wave; The monitoring data is sent from the monitored device to the main monitoring device.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of a monitoring device showing one embodiment of the present invention. As shown in the figure, this monitoring device includes a carrier wave detection circuit 7 used for detecting the quality of the line corresponding to the monitored devices 21a, 22a to 2na, and a carrier wave detection circuit 7 for the monitored devices 21a, 22a to 2na. Each of them is provided with a carrier wave control circuit 4 that stops the carrier wave from the modem 6 for a certain period of time and requests circuit connection with the main monitoring device 1. Other than that, it is the same as the conventional example.

Next, the operation of sending monitoring data from any monitored device to the main monitoring device 1 at any time will be described. for example,
Taking the example of the monitored device 21a, first, when sending monitoring data, the carrier wave control circuit 4 stops the carrier wave of the modem 6 for a certain period of time, and requests a line connection to the main monitoring device 1. 1, the carrier wave detection circuit 7 detects the stoppage of the carrier wave of the monitored device 21a, and notifies the monitoring control circuit 3. In the monitoring control circuit 3, the normal sequential monitoring from the monitored device 21a to 2na is temporarily stopped, and the line switching circuit 5 selects the monitored bag W21a and outputs a call signal.

Next, upon receiving the call signal, the monitored device 21a outputs monitoring data to the main monitoring device 1.

After receiving the monitoring data from the monitored device 21a, the main monitoring device 1 returns to the normal monitored devices 21a, 22a to 22a.
2na is sequentially monitored. On the other hand, in order to determine the quality of the line, the carrier wave detection circuit 7 performs an operation of detecting the suspension of the carrier wave for a certain period of time or more.

〔Effect of the invention〕

As explained above, in a plurality of monitored devices using a plurality of carrier waves, each of the monitored devices is equipped with a carrier wave control circuit, a line connection is requested from the monitored device to the main monitoring device, and the carrier wave is By stopping the sending of
This has the effect of providing a monitoring device that can send monitoring data from any monitored device to the main monitoring device at any time.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a monitoring device showing an embodiment of the present invention, and FIG. 2 is a block diagram of a monitoring device showing a conventional example. 1... Main monitoring device, 21.22, ~2n, 21a, 2
2a, 2na...Monitored device, 3...Monitoring control circuit, 4...Carrier control circuit, 5...Line switching circuit, 6
...Modem, 7.Carrier detection circuit, 8.Monitored control circuit.

Claims (1)

[Claims] In a monitoring device including a main monitoring device that monitors a plurality of monitored devices using a plurality of carrier waves and collects monitoring data of each of the monitored devices, the A carrier wave control circuit that requests a line connection to a monitoring device and stops sending out the carrier wave is provided, selects any monitored device from the plurality of monitored devices at any time, and transmits the monitoring data from this monitored device. A monitoring device characterized in that the information is sent to the main monitoring device.