JPS63151163A - Data gathering system - Google Patents

Abstract

PURPOSE:To inexpensively constitute a environmental data gathering system by monitoring the speaking state of a public telephone set and disconnecting it from a switched line and connecting a sensor device to the switched line to transmit the data signal of the sensor with a public telephone network as the data transmission line if the public telephone set is in the non-speaking state. CONSTITUTION:A sensor device 200 always monitors the speaking state of a public telephone set 205; and if it is not in the speaking state, a speaking monitor circuit 202 outputs a control signal to disconnect the public telephone set 205 from a switched line l by a line switching circuit 201 and a data transmission circuit 203 is connected to the line l. On the other hand, various environmental states are detected by a sensor circuit 204 and various data are transmitted by the transmission circuit 203. Sensor devices 2001-200n-1 having the same constitution as this sensor device 200 are installed in respective places and data at respective observation points are gathered to a data gathering device 100 through a public telephone network 300.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data collection system, and particularly to an environmental data collection system using a public telephone network.

[Conventional technology]

Conventionally, this type of environmental data collection system has been configured using a dedicated line as a data transmission path between each sensor device and a data collection device.

[Problem that the invention seeks to solve]

The conventional environmental data collection system described above has a system configuration that uses a dedicated line as a data transmission path, so when building a new system, in addition to installing each sensor device, it is necessary to install the data collection device. A dedicated line must be installed to connect the sensor device and the sensor device, and as the scale of the system increases, the cost burden on the dedicated line becomes enormous. In contrast to the conventional environmental data collection system described above, the present invention uses existing public telephones and public telephone lines as a data transmission means, and uses the idle time of the public telephone to transfer the sensor device to the public telephone line. It provides an environmental data collection system that is equipped with the function of connecting to a network and transmitting data to and from a data collection device, and is an original system that uses existing public telephones and public telephone lines as data transmission lines as appropriate. have content.

[Means for solving problems]

The environmental data collection system of the present invention includes a call monitor circuit that monitors the usage status of a public telephone to which a sensor device is connected, and a call monitor circuit that determines whether the public telephone line is connected to a public line when the public telephone is not in use. , a sensor device comprising a line switching circuit that connects a data transmission circuit that transmits output data of a sensor circuit that monitors environmental conditions, and environmental data that is connected to a public line and transmitted by each sensor device. It consists of a data collection device that collects data.

〔Example〕

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

FIG. 1 is a block diagram showing the configuration of a data collection device according to an embodiment of the present invention. The data collection device 100 is
A line connection circuit 101 that connects to the public line 1, a data transmission circuit 102 that sends and receives data from each sensor device 200 described later, and controls the entire data collection system and collects data from each sensor device 200 described later. FIG. 2 is a block diagram showing the configuration of a sensor device according to an embodiment of the present invention. The sensor device 200 includes a call monitor circuit 202 that constantly monitors the call status (for example, hook switch, etc.) of the public telephone device 205, and outputs a control signal to notify the state when the public telephone device 205 is not in the call state. , a line switching circuit 201 that disconnects the public telephone device 205 from the public line l under the control of the control signal and connects a data transmission circuit 203 described later to the public line l, and a sensor that detects various environmental conditions. It is comprised of a sensor circuit 204 and a data transmission circuit 203 for transmitting various data detected by the sensor circuit 204 to the data collection device described above.

FIG. 3 is a block diagram showing an overall view of an environmental data collection system according to an embodiment of the present invention.

The data collection device 200 is a public line! ! 21 and 4'22
~J2m+ is connected to the sensor devices 1001 to 100. which are installed in various places via the public telephone network 300. , collects various environmental data and connects ordinary public telephones 3011 to 30.
1o is connected to the public telephone line network 300 via public lines e11-f, fl.

The environmental data collection system of the present invention uses the existing public telephone line network and public telephone equipment as a data transmission path, and installs sensor devices with the configuration shown in FIG. Data at each aa point is collected as an observation point via the aforementioned public telephone line network into a data collection device having the configuration shown in FIG. On the other hand, when the public telephone device of the sensor device is used to make a call, the sensor circuit is disconnected from the public line and controlled to function as a normal public telephone.

〔Effect of the invention〕

As explained above, the present invention provides a data collection system that utilizes the functions of public telephone equipment connected to the existing public telephone network without impairing it and uses it as a data transmission path, and is particularly effective in urban areas. It is suitable for building an environmental data collection system that equips existing public telephone equipment with sensor functions to detect various environmental data.
It has the effect of being able to be constructed in a short period of time and at low cost, without having to install a new dedicated line as in the past. Furthermore, as mentioned above, since the free time of the public telephone equipment is used, there is also the effect that the public telephone equipment and the public telephone line network can be used effectively.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a data collection device according to an embodiment of the present invention. 100...Data collection device, 101...Line connection circuit, 102...Data transmission circuit, 103...Data collection circuit e...Public line, Figure 2 shows an embodiment of the present invention. FIG. 2 is a configuration diagram of a sensor device. 200...Sensor device, 201...Line switching circuit,
202... Call monitor circuit, 203... Data transmission circuit, 204... Sensor circuit, 205... Public telephone equipment, l... Public line, Fig. 3 shows the environment of one embodiment of the present invention. 1 is an overall diagram of a data collection system. 300...Public telephone network, 3011~301°...
・Public telephone device, 100...Data collection device, 2゜O
I~2001-1...sensor device, l 1s~e I
on 121~1!21...Public line. Foil 10 Foil 2 figure

Claims (1)

[Claims] It has a line switching function that monitors the call state of the public telephone device, disconnects the public telephone device from the public line when it is not in a call state, connects the sensor device to the public line, and sends out the data signal of the sensor. , a data collection method characterized by using the public telephone network as a data transmission path.