JPH05211691A - Monitor system - Google Patents

Abstract

PURPOSE:To transmit the state change information on the monitoring items produced at a monitored station in the least time in a monitor system comprising a monitor station and plural monitored stations. CONSTITUTION:The monitored stations 2-4 are provided with the low-speed FSK signal transmitters 12a and 12b which transmit the monitoring items as the typical information of the stations in a steady state, a high-speed FSK signal transmitter 13 which transmits the information on the monitoring items having the state changes to a monitoring station 1 at a high speed, a control circuit 14 which controls those FSK signal transmitters, and an FSK transmitter/ receiver 6 which has a low speed and a common frequency. Meanwhile the station 1 is provided with the low-speed FSK signal receivers 7-1-7-N which receive the low-speed FSK signal from each station in a normal state, a high- speed FSK signal receiver 8 which receives the data obtained with occurrence of a state change, an FSK transmitter/receiver 6 the same as the monitored station, and a control circuit 10. In such a constitution, the information is sent to the station 1 at a high speed when a state change occurs. Then the transmitter/receiver 6 is used for information and recognition of the state change of each station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring system, and more particularly to a monitoring system in which monitoring data acquired by a plurality of monitored stations is collected and monitored by a remote monitoring station.

[0002]

2. Description of the Related Art A conventional monitoring system is frequency shift keying (Frequency modulation) using different frequencies from each monitored station.
CY Shift Keying (hereinafter abbreviated as FSK) signal is used to send monitoring data to the monitoring station at the same time, and the monitoring station uses the specified FSK signal to sequentially call each monitoring station and respond with the same FSK signal. A polling method is used to collect monitoring information.

[0003]

In the above-mentioned conventional direct report method, since the FSK frequency is assigned to each monitored station and a large number of FSK signals are transmitted in a limited frequency band, the data transfer rate becomes slow. There was a problem.

Further, in the polling method, although the one having a high data rate can be used, since the data is sequentially called to collect the data, even if the status of the monitoring data changes, it takes time to complete the report to the monitoring station. There was a problem that it took too much time.

The object of the present invention is to solve the above-mentioned problems,
It is an object of the present invention to provide a monitoring method that secures promptness at the time of a state change and significantly shortens the reporting time to the monitoring station without slowing down the data rate.

[0006]

A monitoring system according to the present invention is a monitoring system in which a monitoring station remotely monitors through monitoring data relating to predetermined monitoring items transmitted from a plurality of monitored stations. When there is no steady state, the monitored pole and the monitoring station exchange the monitoring data at a predetermined low data transfer rate, and when the state of the monitoring data changes, the monitored station and the monitoring station transfer a predetermined high data. It is configured to exchange the monitoring data at a speed.

Further, in the monitoring system of the present invention, the monitored station that has generated a change in the status of the monitoring data immediately notifies the other monitored stations and the monitored station of the low data transfer by the other monitored stations. The transmission of the monitoring data depending on the speed is stopped, and the monitoring data is transmitted to the monitoring station at the high data transfer rate.

Further, the monitoring system of the present invention has a structure in which the monitoring data is transmitted and received between the monitoring station and a plurality of monitoring stations by a frequency shift keying signal.

[0009]

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

FIG. 1 is a block diagram showing an embodiment of the present invention.

The embodiment shown in FIG. 1 comprises a monitoring station 1 and three monitored stations 2, 3 and 4 connected to the party line by a monitoring station 1 and a hybrid circuit 5.

The monitoring station 1 includes a hybrid circuit 5 and a data transmission / reception system when a change in the status of the monitored item of the monitored station occurs.
50 baud FSK signal (f1) transceiver 6 with frequency f1
And N number of 50-baud FSK signal (fm) receivers 7-1 to 50-baud FSK signal (fn) receivers 7 for receiving monitoring data in a steady state due to low data transfer rates of different frequencies of the monitored station. -N, a 1200 baud FSK signal receiver 8 for receiving data at a high data transfer rate, a decoder 9, and a control circuit 10 for controlling the operation of the monitoring station.

Further, the monitored stations have basically the same configuration, only the FSK frequencies for data transfer are different from each other, and the only difference is that frequency multiplex communication is secured.

Taking the monitored station 3 as an example, for example, the monitored station 3 includes a hybrid circuit 5, a 50-baud FSK signal (f1) transceiver 6, and a 50-baud FSK having a frequency fm.
(Fm) transmitter 12a, 1200 baud FSK signal transmitter 13, and control circuit 1 for controlling the overall operation of monitored station 3
4 and an encoder 15. The monitored station 45 also
It is the same as the monitored station 3 except for the used frequency. Note that FIG.
Then, the configuration display of the monitored station 2 is omitted.

Next, the operation of this embodiment will be described.

The monitoring station 1 is connected to the monitored stations 2, 3 and 4 by a hybrid circuit 5 in a party line format.

For example, in the monitored station 3, the monitoring item (A
When the monitoring data regarding LM) is input, the encoder 15 performs an encoding process, and if there is a state change, a state change signal is early issued to the control circuit 14.

The control circuit 15 controls the 50-baud FSK transceiver 6 so that the FSK receives a negative frequency shift signal.
The signal (f1 (-)) is sent out on the party line.

In other monitored stations, such as monitored station 4,
When the FSK signal is received, the signal is sent to the control circuit 14.

The control circuit 14 includes a 50 baud FSK transmitter 1
2b is controlled to stop the transmission of the FSK signal (fn).

The other monitored stations are similarly 50 baud FSK.
Stop the signal.

In the monitored station 3, the control circuit 14 confirms that the 50-baud FSK transceiver 6 has no received signal,
The sending of the FSK signal (fm) from the baud FSK transmitter 12a is stopped, and instead, the 1200 baud FSK transmitter 13 sends the data to the party line.

In the monitor station 1, the 1200 baud FSK receiver 8 receives the FSK signal on the party line and sends it to the decoder 9.

When the decoder 9 completes the reception of data,
A signal is sent to the control circuit 10, which controls the 50-baud FSK transceiver 6 to send the FSK signal (f1 (+)) due to the positive frequency shift on the party line.

At each monitored station, the FSK signal (f1
50+ FSK signal transmitter 12 upon receiving (+))
By driving a, 12b, etc., if there is a change in the status of the monitored item, the FSK signals (fm (-)), (fn (-)), etc. are sent from each monitored station to the party line.

If there is no change in the status of the monitored items, FS
K signals (fm (+1)), (fn (+)), etc. are output from each monitored station.

In the monitoring station 1, the FSK receivers 7-1 to 7-
At N, the FSK signal transmitted from each monitored station is received, and the state of each monitored station is monitored.

[0028]

As described above, according to the present invention, when the status of the monitoring information changes, the information can be transferred by using the high speed FSK signal, and the information can be transmitted to the monitoring station with the minimum time delay. Have.

Further, in the steady state in which the monitoring items do not change, the state of each monitored station is received as an FSK signal.
There is an effect that it can be used as it is as monitoring information without any logical judgment at the monitoring station.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

[Explanation of symbols]

1 Monitoring station 2, 3, 4 Monitored station 5 Hybrid circuit 6 50 baud FSK signal (f1) transceiver 7-1 to 7-N 50 baud FSK signal (fm) receiver to 50 baud FSK signal (fn) receiver 9 Decoder 10 Control circuit 12a, 12b 50 baud FSK signal (fm) transmitter, 50 baud FSK signal (fn) transmitter 13 1200 baud FSK signal transmitter 14 Control circuit 15 Encoder

Claims (3)

[Claims] 1. In a monitoring method for remotely monitoring by a monitoring station through monitoring data relating to predetermined monitoring items transmitted from a plurality of monitored stations, the monitored pole and the monitored pole are monitored in a steady state where the status of the monitoring data does not change. The station transmits and receives the monitoring data at a predetermined low data transfer rate, and when the state of the monitoring data changes, the monitored station and the monitoring station exchange the monitoring data at a predetermined high data transfer rate. A monitoring method characterized by the above. 2. A monitored station that has generated a change in the status of the monitored data immediately notifies the other monitored stations and the monitored station, and sends the monitored data at the low data transfer rate by the other monitored station. 2. The monitoring system according to claim 1, wherein said monitoring data is stopped and said monitoring data is sent to said monitoring station at said high data transfer rate. 3. The monitoring system according to claim 1, wherein the monitoring data is exchanged between the monitoring station and a plurality of monitoring stations by a frequency shift keying signal.