JPS59169249A - Polling data collecting system - Google Patents

Abstract

PURPOSE:To perform the accurate processing, control, display, etc. of data in case a central monitor station collects the observation data by a polling system, by providing the simultaneousness among the observation data collected by the central monitor station. CONSTITUTION:A central monitor station 10 outputs a general observation command to observing stations 1-n to hold totally the observation data before it collects the observation data. Thus all stations 1-n identify the received signals and latch the observation data. The station 10 calls out successively these held observation data to collect them. In such a way, the stations 1-n can have the same time point of observation in terms of real time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a polling data collection method, and more particularly to a method in which a central monitoring station collects observation data from a plurality of observation stations by a polling method in a telemeter system.

[Technical background of the invention]

The telemeter system is shown in Fig. 1, and consists of a plurality of observation stations 1, 2, . The formation of a communication network by wireless transmission lines [5], which is used in a wide range of fields, such as weather observation, monitoring of pollution information, and monitoring and control of hydropower dams. .

Conventionally, this type of system has included a continuous monitoring control element as a transmission function, so the central monitoring station 10 (as a data collection method) has used unidirectional transmission using a cyclic method, or A call-response type transmission based on the Tsumugi-yuru polling method, in which each observation station 1, 2, . To explain the specific operation of the method 7.1', the central monitoring station 10 sequentially gives a call command to each observation station l, 2...n, and calls '?!I observation stations 1, 2...n. The system is configured such that when a call command is received from the central monitoring station 10, observation data at that point in time is immediately stored.

[Problems with background technology]

However, in the conventional method described above, each observation station holds different observation data at different times, and there is no real-time simultaneity between the collected observation data. In systems that perform data processing, control of various devices, display, recording, transfer, etc. based on such observation data from time to time, the time delay n between the data (because of this, accurate data processing, control, display, and There was an inconvenience that it was not possible to do things like...

[Purpose of the invention]

This invention was made in view of the above-mentioned circumstances, and provides polling data that makes it possible to collect multiple simultaneous observation data by making the real-time observation times of multiple observation stations the same time. The purpose is to provide a collection method.

[Summary of the Invention] In other words, the present invention shows that before a central monitoring station sequentially collects observation data from a plurality of observation stations, the observation data at the relevant point in time is held all at once across the plurality of observation stations. By transmitting a simultaneous hold command, the real-time observation times at the plurality of observation stations are made to be the same time, and after that, for example, the central monitoring station transmits observation data to the plurality of observation stations. By sequentially transmitting a call command indicating the above-mentioned observation data in chronological order, the plurality of observation data held from the plurality of observation stations are sequentially collected.

[Embodiments of the invention]

Hereinafter, a polling data collection method according to the present invention will be explained in detail according to an embodiment shown in the accompanying drawings.

FIG. 2 shows an example of the internal configuration of each observation station for implementing the polling data collection method according to the present invention. Note that the telemeter system according to the present invention has n observation stations 1, 2...n, similar to the one shown in FIG.
and one central monitoring station lO.

In FIG. 2, an input/output device 20 includes a signal identification circuit 30 and a data output buffer 40;
0 is a latch circuit. In this embodiment, a detection circuit that detects, for example, weather elements, water level, water quality, etc. and outputs the detected data D to the latch circuit 50 is not shown.

The signal identification circuit 30 identifies the signal received via the transmission line 15, and if the received signal is a command to simultaneously hold observation data transmitted from the central monitoring station 10, it immediately sends a set signal to the latch circuit 50. and latches the observation data D at that point in time.

Further, if the signal received through the transmission port @15 is a call command instructing the transmission of observation data transmitted from the central monitoring station 10, the signal identification circuit 30 sends a set signal to the data output buffer 740, The observation data D latched by the latch circuit 50 is input to the data output buffer 40, and the input observation data is transmitted to the central monitoring station via the transmission line 5.

Next, an example of the overall operation of the polling data collection method according to the present invention will be described in detail with reference to the time chart shown in FIG. 3 in addition to FIG. 1 and 111g2. In addition, in FIG. 3, the central monitoring station 10 is connected to a plurality of observation stations 1, 2, .・・・
- Indicates the timing of the signal output for n.

First, before collecting observation data, the central monitoring station 10 collects observation data from a plurality of observation stations 1, 2, . ...A one-axe observation command indicating simultaneous storage of observation data for n is sent at time t.

(See FIG. 3(a)). Transmission line 15
All observation stations that received the simultaneous observation command via 1.2.
. . n, the signal identification circuit 30 identifies the received signal, and immediately after the identification, inputs a hit signal to the latch circuit 50. As a result, all observation stations 1.2. . . . n latch circuits 50 latch the observed data at the relevant time point. Each observation station 1, 2. Since the timing of the simultaneous observation command inputted to n is the same, all observation stations 1, 2, . . . . The acquisition of observation data into the latch circuit 50 at n is also interrupted at the same time.

This allows multiple observation stations 1, 2 . ...The real-time observation times at n can be the same time.Next, the central monitoring station 10 first sends the observation data to the observation station 1 in order to sequentially collect the observation data held at the same time. A call command for transmitting the held observation data is output a predetermined time after time t0 (time t1) (see Fig. 3).
b)). In the observation station 1 that has received the calling command via the transmission line 15, the signal identification circuit identifies the received signal, and if it recognizes that the received signal is for its own station, it immediately outputs the data. A set signal is input to 7a40. As a result, the data output buffer 40 takes in the observation data latched by the latch circuit 50, and transmits the taken data to the central monitoring station IO via the transmission line 5.

After outputting a calling command to the monitoring station 1, the central monitoring station 10 sequentially transmits the calling command to the observation station 2 at time t2 (see FIGS. 3(d) and 3(e)).

Each observation station 2, 3. . . n performs the same operation as that of the observation station 1 described above, but since the timing of the call command transmitted from the central monitoring station 10 is appropriately shifted, each observation station 1, 2 . ...The observation data transmitted from n will not collide at the central monitoring station 10.

As described above, even with the method of the present invention, the time required to collect all observation data is not much different from that of the conventional polling method. This method differs greatly from conventional methods in that the data is

〔Effect of the invention〕

As explained above, according to the polling data collection method using θ1 in the present invention, complete simultaneity is achieved between multiple pieces of observation data collected by the central monitoring station (
This, data processing that requires simultaneity between observation data, each at
If applied to 11 control, display, recording, etc. of devices, accurate functions can be achieved6.

[Brief explanation of drawings]

Figure 1 is a block diagram showing the configuration of the telemeter system.
FIG. 2 is a block diagram showing an internal embodiment of an observation station adopted in the polling data collection method according to the present invention, and FIG.
The figure is a time chart showing an example of the operation of the polling data collection method according to the present invention. 1.2...n... Observation station, 10... Central monitoring station, 15... Transmission line, 20... Input/output device, 30...
...Signal identification circuit, 40...Data output buffer, 5
0...Latch circuit.

Claims (1)

[Claims] In a polling data collection method in which a central monitoring station automatically collects data observed at multiple observation stations 110 times, the central monitoring station issues a simultaneous observation command to the multiple observation stations at a predetermined point in time. A polling data collection method characterized in that observation data from each observation station is held all at once, and the central monitoring station sequentially collects the held observation data.