JPS60246142A - Supervisory equipment - Google Patents

Abstract

PURPOSE:To transmit inexpensively and efficiently a supervisory signal by allowing a supervisory signal to be transmitted to a supervisory station from plural stations to be supervised according to a predetermined order by one call control signal from the supervisory station. CONSTITUTION:A reception circuit 11 receiving a control signal 14 in a supervisory equipment for the station 22 to be supervised of a supervisory system supervising the station 22 to be supervised in #1-#n stations at the supervisory station 21, detects a call control signal at a time t0 elapsed after reception, generates a trigger signal 15, starts counting by a clock circuit 12 and when the time reaches a predetermined time tk, the clock circuit 12 generates a gate signal 16 and allows a transmission circuit 13 to transmit a supervisory signal 7 of the station to be supervised. The tk is set individually by the clock circuit 12 of the supervisory equipment of each station 22 to be supervised, and when the time is set so as not to be overlapped between supervisory equipments of the station to be supervised, and the supervisory signal 7 is transmitted to the supervisory station 21 from plural stations 22 to be supervised in the #1-#n stations by using one call control signal 14 from the supervisory station.

Description

Detailed Description of the Invention (Technical Field) The present invention is a remote monitoring system that monitors the status of a plurality of monitored stations. This invention relates to a monitoring device for a monitored station that makes it possible to transmit.

(Prior art and its problems) Conventionally, in a remote monitoring system that monitors a plurality of monitored stations, there is a method of selectively calling each monitored station one by one in order to send a monitoring signal from the monitored station to the monitoring station. It had been taken.

As shown in FIG. 1, this type of monitoring device for a monitored station decodes a control signal 4 for selective calling from a monitoring station in a receiving circuit 1 to identify whether or not the own monitoring station has been selected. Only when the own station is selected, the receiving circuit 1 generates the gate signal 5 and transmits the monitoring signal 7 from the sending circuit 2 to the monitoring station.

Therefore, the monitoring device of the monitoring station in the above-mentioned selective calling method monitoring system requires a circuit with an expensive function in order to constantly selectively call and control each monitored station, and the monitoring device of the monitored station requires decoding. Expensive receiver circuit with functions 1
A sending circuit 2 is required to follow the control signal 4 for selective calling. In addition, an independent transmission path between the monitoring station and the monitored station is required for transmitting the control signal for selective calling and the monitoring signal, or an independent frequency channel is required for the control signal and the monitoring signal. Therefore, a monitoring system constituted by this type of monitoring device has the drawback of being expensive.

(Object of the Invention) The present invention solves the above-mentioned drawbacks, and a single call control signal from the monitoring station allows monitoring signals to be sent to the monitored station from a plurality of monitored stations in accordance with a predetermined order of the monitored night. An object of the present invention is to provide an inexpensive monitoring device that transmits data from the station to the monitoring station.

(Structure of the Invention) The present invention provides a receiving circuit for receiving a paging control signal sent from a monitoring station in a monitoring device for a monitored station in a monitoring system that monitors a plurality of monitored stations. Between the sending circuit which converts the monitoring input signal into a monitoring signal and sends it to the monitoring station, the monitoring signal is transmitted from the reception of the control signal so that the monitoring signal is sent out according to a predetermined order among the plurality of monitored stations. This is a monitoring device with a clock circuit inserted to set the time until transmission.

(Embodiments of the Invention) Next, an embodiment of the present invention will be described with reference to FIG. 4, a diagram of a monitoring system using a monitoring device according to the present invention, FIG. 5, a time chart showing its operation, and FIG. 2, a block diagram of a monitoring device according to the present invention. This will be explained with reference to its time chart in FIG.

The monitored stations 22 of stations #1 to #n shown in FIG.
In the monitoring system for monitoring the monitored station 22, the monitoring device shown in FIG. 2 for the monitored station 22 according to the present invention operates as shown in the time chart shown in FIG. In the monitoring device according to the present invention shown in FIG. 2, a receiving circuit 11 that has received a control signal 14 detects that it is a calling control signal after an elapsed time to after receiving it, generates a trigger signal 15, and causes a clock circuit 12 Start timing by. The clock circuit 12 starts counting a predetermined time tk based on the signal 20.

When a predetermined time tk is reached, the clock circuit 12 generates a gate signal 16 and the sending circuit 13 sends out the monitoring signal 7 of the monitored station. The predetermined time tk is individually set in the clock circuit 12 of the monitoring device of each monitored station 22, and is a time for measuring the timing from the detection of the control signal 14 to the transmission of the monitoring signal 7. If a predetermined time ik is set so that it does not overlap between the monitoring devices of each monitored station, # by one call control signal 14 from the monitoring station as shown in the time chart of FIG. The monitoring signal 14 can be transmitted to the monitoring station 21 from a plurality of monitored stations 22 of stations 1 to #n.

(Effects of the Invention) As explained above, the present invention synchronizes the clock circuit of the monitoring device of each monitored station with the calling control signal, and sequentially sends out the monitoring signal after a fixed time that varies depending on each station. can do. Therefore, the monitoring device can provide a monitoring system that can send out monitoring signals at an extremely low cost and with high efficiency. Further, the monitoring device of the present invention has the effect that the transmission path between the monitoring station and the monitored station can be realized as a pair of transmission paths, or that the frequency allocation for the control signal and the monitoring signal can be realized in one wave.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a monitoring device for a monitored station in a conventional selective calling method, FIGS. 2 and 3 are a block diagram and a time chart showing the operation of a monitoring device for a monitored station according to the present invention, and FIG. 4 FIG. 5 is a block diagram of a monitoring system in which the monitored station monitoring device according to the present invention is installed at a plurality of stations, and a time chart showing the transmission status of control signals and monitoring signals. In the diagram A, 1.11...Reception circuit, 2゜13...Sending circuit, 3...Monitoring input terminal, 4.14...Control Signal, 5.16...
...Gate signal, 6...Monitoring input signal, 7...
...Monitoring signal, 12...Clock circuit, 15.
...Trigger signal, 20... Timing signal, 2
1...Monitoring station, 22...Monitored station, 2
2... Transmission line Figure 1 Figure 2 Figure 4

Claims (1)

[Claims] In a monitoring device installed in a monitored station of a monitoring system constituted by a monitoring station and a plurality of monitored stations, a receiving circuit for receiving a paging control signal sent from the monitoring station; Between the sending circuit which converts the monitoring input signal into a monitoring signal and sends it to the monitoring station, the monitoring signal is transmitted from the reception of the control signal so that the monitoring signal is sent out according to a predetermined order among the plurality of monitored stations. A monitoring device characterized in that a clock circuit for timing is inserted to set the time until sending out.