JPS6120465A - Data collecting system - Google Patents

Abstract

PURPOSE:To enable long-distance transmission even when plural terminal equipments are connected and to reduce the equipment cost by providing an amplifier network controlling device for repeating that amplifies signals transmitted between a central equipment and terminal equipments between the central equipment and the terminal equipments. CONSTITUTION:An exchange 4 in a telephone exchange network is connected to the input/output end of the central equipment 1 through the network controlling device 3 of the telephone communication network, and this exchange 4 is connected to an exchange 6 of the terminal side through a telephone circuit 5. Plural amplifier network controlling device 10 for repeating are connected to the exchange 6, and plural terminal equipments 2-1-2-n are connected to the network controlling device 10 for repeating by the multidrop system. The network controlling device for repeating has, besides ordinary network controlling functions, amplifiers 13, 14 that amplify data request signals sent out from the central equipment 1 and send to terminal equipments 2-1-2-n and amplify measurement data signals sent out from terminal equipments 2-1-2-n and send to the central equipment 1, and even if the distance between terminal equipments 2-1-2-n and the amplifier network controlling device 10 for repeating becomes long, data collection becomes possible.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a data collection system that collects measurement data such as water level, electricity, water supply, etc. measured at a plurality of measurement terminals using a communication line, and in particular, This invention relates to a data collection system with improved means.

[Technical Background of the Invention] Conventionally, there is a data collection system that collects measured quantities measured at a plurality of measurement terminals using a communication line, such as a telephone line. For example, if you want to centrally monitor water levels, flow rates, or water quality measurements at multiple points on a river, you can install terminal devices that store the measured amounts as measurement data at each point in advance, and A solid device (center device) is provided to collect the measurement data stored in these terminal devices, and this center device calls each terminal device via a communication line to collect the measurement data of each point in the center device. ing. In addition, such a data collection system with multiple measuring points can be used in many ways, such as calculating the amount of electricity, water, gas, etc. used by each household in an apartment complex, or measuring the temperature at each fixed measurement point of mechanical equipment. applied across the board.

FIG. 4 is a configuration diagram of a conventional data collection system. This data collection system uses a telephone line, and a center processing unit [100 includes a network control unit 101 of a telephone communication network].
An exchange 1102 in the telephone exchange network is connected to the terminal via a telephone line 103, and an exchange 104 on the terminal side is connected from this exchange 102 via a telephone line 103. And this exchange I
A plurality of network control devices 105 (only one network side m device is shown in FIG. 4) are connected to the network control device 104.
One terminal device 106 is connected to 05.

Note that the network side m devices 101 and 105 are the center processing device 1
00 and terminal device 106 side and telephone t11407゜10
8. Therefore, when converging measurement data, the terminal device 106 that should collect data from the center processing device 100 to each network control device 105
The network control device 105 transmits a signal indicating the dial of the connected network control device 105, and receives this signal and becomes capable of communication! Measurement data is transmitted from the terminal device 106 through 1105.

[Problems with the Background Art] As described above, since only one terminal device @106L is connected to the network f+11111 device 105, when the number of measuring terminals, that is, the terminal devices 106 increases, the exchange 104
Net control! There is a problem in that a plurality of Li devices 105 must be connected to each other, which increases the installation cost.

Therefore, in order to solve this problem, the network control device 105
It is conceivable to connect a plurality of terminal devices 106 in common. However, if a plurality of terminal devices 106 are connected in common, the call signal etc. from the center processing 8M100 will be added to all the terminal devices 106 in parallel, and one signal will be input to one terminal device 106. The disadvantage is that the level of Especially the network control! The longer the distance between the ll device 105 and the terminal device 106, the greater the level drop.

[Object of the Invention] The present invention has been made based on the above-mentioned circumstances, and its purpose is to provide an economical data collection system that allows long-distance transmission even when a plurality of terminal devices are connected. It's about doing.

[Summary of the Invention] The present invention provides a relay amplifier device between a center device that collects data and each terminal device provided for each measurement end, and the relay amplifier device allows data to be transmitted from the center device. The data collection system is designed to extend the distance of the terminal devices by amplifying the data request signal and sending it to each terminal device, and amplifying the measurement data signal from each terminal device and sending it to the center device. be.

[Embodiment of the Invention] Hereinafter, an embodiment of the data collection system according to the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a configuration diagram of the data collection system. This data convergence system uses a telephone line as a communication line, similar to the system shown in FIG. In FIG. 1, 1 is a center device, which stores measurement data (
For example, it has the function of collecting data (for example, river water level, water volume, electricity, water, and gas usage in each household) and processing this measured data into a state that is easy to manage. At the input/output end of this center equipment @1, there is network side equipment W13 of the telephone communication network.
An exchange 1114 in the telephone exchange network is connected via the telephone line 5, and this exchange 4 is connected via a telephone line 5 to an exchange 6 on the terminal side. Note that the network control device 3 is connected to the exchange 1 and 4 and 6.
Terminal device 2-1 specified by center device 1 via
2-n, and has the function of controlling switching between the center device 1 side and the telephone set 7.

Now, the exchange 6 includes a plurality of relay amplification network control devices 10.
is connected. Note that, due to the nature of the drawing, only one relay network side 6Il device 10 is shown in FIG.

The relay network control device 10 includes the terminal device 2-
A plurality of nodes 1 to 2-n are connected by a multi-drop method. By the way, this relay network control I device 10, in addition to the normal network side control function, amplifies the data request signal sent from the center device 1 to each terminal device 2-1 to 2-Φt, and transmits the data request signal to each terminal device. 2-1 to 2-n, and terminal devices 2-1 to 2-n.
It has a function of amplifying the measurement data signal sent from 2-n and sending it to the center device 1.

Specifically, the configuration is as shown in FIG.

That is, the call detection circuit 11 is connected to the relay amplifier network side intermediary W1.
The line connection switch 12 detects a calling signal (a signal for ringing a bell in a telephone, 16) (Z) to call 10.
This is to put the in the closed state. The line connection switch 12 is connected to an amplifier 13 via a switching switch S1.
and 14 are connected in parallel, and a changeover switch S2 is connected to the other side of these amplifiers 13 and 14. The amplifier 13 is connected in the direction of amplifying the measurement data signals from the terminal devices 2-1 to 2-n (upstream signal), and the amplifier 14 is connected in the direction of amplifying the data request signal from the center Plifl (downstream signal). It is connected to the. The amplification degrees of these amplifiers 13 and 14 are set as follows. In other words, transmission from the center device 1 to each terminal device @ 2-1 to 2 to 11 is a 1-to-n communication, and conversely, the transmission from the center device 1 to each terminal device
The transmission from ~2-n to the center device 1 is one-to-one communication. Therefore, the amplification degree of the amplifier 13 is relatively small;
Further, the amplification degree of the amplifier 14 is set to be relatively large.

Note that the amplification degree of the amplifier 14 is different from each terminal device 2-1 to 2-
It is set according to the number and distance of n. Further, the changeover switches 81 and 82 are normally connected to the amplifier 14 side. The control 1all15 receives the detection signal from the call detection circuit 11, controls each switch S1 and S2 to switch to the amplifier 14 side, and detects the end of transmission of the data request signal and the measurement γ-ta signal, and switches each switch. Switch S1. It has a function to switch and control S2.

Each of the terminal devices 2-+ to 2-n stores the measured amount at the measuring end as measurement data, and the amplification degree at the time of data transmission of these terminal devices 2-5 to 2-n is It is set according to the distance from -t to 2-11 to the relay amplification network control device 10.

Next, the operation of the system configured as described above will be explained. Each of the terminal devices 2-1 to 2-n stores measured quantities such as water level and electricity at each measurement end as measurement data. Therefore, when collecting these measurement data, the center device 1
The dial signal of the relay amplification control device 10 to which 1 to 2-n are connected is sent out. The network control device 3 receives this dial signal and sends out a paging signal P as shown in FIG. 3 to the relay amplification network system m device 10 via the exchange 114.6.

In the relay amplification network control fIl device 10 that receives the paging signal P, its paging detection circuit 11 is activated to close the line connection switch 12 and sends a detection signal to the control unit 15. Upon receiving the detection signal, the control unit 15 checks whether each of the changeover switches S1 and S2 is connected to the amplifiers 141F and 1411. As a result, communication becomes possible between the center device 1 and each terminal GI device 2-s to 2-2,
A signal indicating that communication is possible is transmitted from the IJ 1ttl device 10 to the center device 1 through the relay amplification network.

Then, the center device 1 receives the terminal device @ 2 to collect data.
-1 to 2-11 For example, a data request signal S including an address indicating 2-1 and a data request is transmitted. This signal S is sent to the relay amplification network control device 10 through an exchange (4.6), and is amplified by the amplifier 14 of the relay amplification network side equipment @10 to each terminal device 2-1 to 2-. Each terminal device 2-1 to 2-n that receives this signal S determines whether the addresses match, and sends the matched terminal device 2-1 to
only transmits the measurement data number fY.

By the way, when transmitting and receiving these signals S and D, the changeover switch 81 . S2 is switched and controlled as follows. That is, the control section 15 detects the data request signal S, and if the level of this signal S does not change for a predetermined period of time 11 or more, the changeover switch Sl, 32 is switched to the amplifier 1.
Switch to side 3. Then, the measurement data signal of the terminal device 2-1 transmitted in response to this switching is transmitted to the amplifier 1.
3 and sent to the exchange 6. As a result, the measurement data signal is sent to the center device 1. At this time, the control unit 15 detects the level of the measurement data signal,
If the level does not fluctuate by more than t2 during the predetermined rf period, selector switch S1. Switch S2 to the amplifier 14 side again. In this way, data collection for the terminal device 2-1 is completed. Then, when collecting data for other terminal devices 2-2 to 2-n connected to the relay amplification network control device 10, after completing data collection for the terminal device 2-1,
Subsequently, the data request signal S may be sent from the center device 1 to the terminal devices 2-2 to 2-11. Note that the control unit 1
5 monitors the signal S from the center device 1 for a predetermined period T after the transmission of the measurement data signal is completed, and sends a signal to the call detection circuit 11 to open the line connection switch 12 if the signal S is not detected. Send.

In this way, in the system of the present invention, the center equipment M1
And each terminal wave! ! 12-x to 2-n, an amplifier 13.
A relay amplification network control device 10 is provided to the right of 14, and amplifies the data request signal S from the center device 1 to transmit each terminal wave @2.
-1 to 2-n, and each terminal device 2-1 to 2-n
Since the measurement data signal from the terminal device 2-s to 2-n is amplified and sent to the center device 1, data collection is possible even if the distance between each terminal device 2-s to 2-n and the relay amplification network side device 10 becomes long. becomes. In addition, the number of terminal devices 2-1 to 2-0 increases,
From the relay amplifier network II+control device 10 to each terminal device 2-1~
There is no drop in the level of the data request signal S sent to 2-0. Furthermore, since the amplifiers 13 and 14 are provided for two systems, one for upstream signals and one for downstream signals, the installation status of the system, especially the terminal devices 2-1 to 2-2? The amplification degree can be set separately depending on the installation state of the L. Therefore, even if a large number of terminal devices 2-1 to 2-11 are scattered over a long distance,
Data can be collected for these terminal devices 2-1 to 2-I).

Further, there is no need to connect a relay network control device to which one terminal device is connected to a plurality of exchanges 6 as in the conventional method, and the equipment cost corresponding to this can be reduced, making it economical.

Also, unlike the case where the relay network control device is connected to multiple exchanges 6, data collection for the terminal devices 2-1 to 2-11 can be done by just one dialing to the relay amplification network control device 10. It's over. Therefore, data collection time is reduced.

It should be noted that whether the terminal devices 2-1 to 2-n are installed at a long distance or those installed at a short distance are mixed, and the amplification degree of the amplifier 14 is set for the one at a long distance. Even if a relatively high level signal is input to a nearby terminal device, the terminal device 2-.

Since the input tolerance value of ~2-n is generally widely taken,
The input signal is never clipped.

As a result of the above, measurement data can be collected at measurement terminals scattered over a wide area.

[Effects of the Invention] According to the present invention, a repeating amplification network control device for amplifying signals transmitted between the center device and each terminal device is provided between the center device and each terminal device. Even if a terminal device is connected, long-distance transmission is possible, and It > R
can provide a comprehensive data collection system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the data collection system according to the present invention, FIG. 2 is a specific block diagram of the amplification control device for middle R' in the system shown in FIG. 1, and FIG. 2 is a diagram showing the operation timing of the relay j1 width M4 control device shown in FIG. 2, and FIG. 4 is a configuration diagram of a conventional data collection system. 1... Center device, 2-1 to 2-11... Terminal 8f
l, 4.6...exchange, 5...telephone line, 10...
- Relay site #fA network control device, 11... Call detection circuit, 12... Line connection switch, 13.14... Amplifier, 15... Control unit, 31.32... Changeover switch.

Claims (2)

[Claims] (1) Data request signal to terminal side (including terminal address)
and a center device that has the function of collecting measurement data signals from each measurement end sent from the terminal side in response to this data request signal, and amplifying the data request signal sent from this center device. and a relay amplifier for amplifying the measurement data signal from the terminal side; and a relay amplifier provided for each measurement terminal, which receives the data request signal amplified by the relay amplifier and transmits the measurement data signal to the relay. A data collection system comprising: a plurality of terminal devices that transmit data to the center device via an amplifier for data collection, and the distance between the center device and the plurality of terminal devices is increased. (2) The relay amplifier device includes a first amplifier with a relatively high degree of amplification that amplifies the data request signal from the center device according to the number and distance of the terminal devices, and a first amplifier that amplifies the data request signal from the center device according to the number and distance of the terminal devices. Claim 1, comprising: a second amplifier with a relatively low amplification degree; and a changeover switch that switches between the first and second amplifiers in accordance with the transmission of the data request signal and the measurement data. The data collection system described in section 1).