JP2680425B2 - Data transmission equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a terminal network control device connected to a communication line from a center device connected to the communication line via a center side network control device. Call the terminal device connected via the call with no ringing incoming, collect data from the terminal device to the center device, call the center device from the terminal device,
The present invention relates to a data transmission device that transmits security information and the like from a terminal device to a center device.

(Prior Art) This type of data transmission device, for example, automatically meters meters for water, gas, electric power, etc. via a telephone line and collects usage data and residual amount data of vending machines. The telemeter system that collects the data of the terminal devices scattered over a wide area such as the above is configured. Meters for measuring water, gas, electric power, etc. are connected to a telephone line via a terminal device, but since a general telephone is also connected to the telephone line, when calling the terminal device for data collection, The ring of the telephone is called by a no-ringing incoming call so as not to ring. Since the data is collected using the existing subscriber telephone line, it is designed to be carried out during a time when there are few calls so as not to hinder general calls.

Such a data transmission device connects a large number of terminal devices scattered over a wide area to a telephone line through a terminal side network control device, and also collects data from each of these terminal devices and centrally manages the data. The device is configured to be connected to the telephone line via the center side network control device. In the data transmission device configured as described above, when data from each terminal device is collected in the center device, the center device controls the center side network control device, the center side telephone line,
No ringing is received via the telephone exchange, no ringing trunk, and the telephone line on the terminal side, and after the connection from the center device to the terminal side network control device is completed, the center device switches the terminal device via the terminal side network control device. The terminal device is started up and the collected data is returned from the terminal device to the center device to collect the data.

Further, in such a data transmission device, not only the center device collects meter reading data such as gas usage amount from each terminal device under the control of the center device, but also under the control of the terminal device, that is, the terminal device. The security information may be transmitted from the terminal device to the center device by calling from the terminal device. Specifically, for example, in a terminal device that reads a gas meter, when a gas leak from the gas meter is detected, it is necessary to send security information such as gas leak information to the center device in order to report the gas leak to the center device. However, for this reason, it is necessary to call from the terminal device to call the center device. When making a call from such a terminal device, the terminal device passes through the terminal side network control device, and further through the terminal side telephone line, telephone exchange, center side telephone line, and center side network control device.
After connecting to the center device, the center device activates the terminal device via the terminal-side network control device, whereby the terminal device transmits the security information to the center device. The center device is provided with a no-ringing call system center device that collects data by receiving a no-ringing call and a terminal call system center device that receives security information by a call from a terminal device. The device is adapted to receive only data collection and the terminal calling center device is adapted to receive only security information.

(Problems to be Solved by the Invention) In the above-mentioned conventional data transmission apparatus, in order to collect data from the terminal device to the no-ringing calling system center device due to the no-ringing incoming call from the no-ringing calling system center device to the terminal device, The terminal calling system center is used when the terminal system is activated from the calling system center device via the terminal side network control device and when the security information is transmitted from the terminal device to the terminal calling system center device by a call from the terminal device. No ringing call method for collecting data from the center device to the terminal device because the starting method when the terminal device is started from the device via the terminal side network control device cannot be distinguished on the terminal device side. And the call from the terminal device for sending security information is almost If they occur at the same time, the start operation for collecting data due to no ringing incoming call is mistaken for the start operation for transmitting security information by calling the terminal, and the security information is sent to the terminal device in response to the start operation for collecting data. Is erroneously transmitted to the no-ringing paging center device, resulting in the loss of security information.

The present invention has been made in view of the above, and an object of the present invention is to provide a data transmission device that prevents malfunction due to collision between a no-ringing incoming call and a terminal outgoing call and avoids loss of information. .

[Structure of the Invention] (Means for Solving the Problem) In order to solve the above-mentioned object, the data transmission apparatus of the present invention has a center side network control device 23 in a communication line 1 as shown in FIG. From the center device 21 connected via the terminal device 37, the terminal device 37 connected to the communication line 1 via the terminal network control device 35 is called with no ringing, and data is collected from the terminal device 37 to the center device 21. At the same time, the center device 21 is called from the terminal device 37,
A data transmission device for transmitting information from 37 to the center device 21, wherein the terminal side network control device 35, when the center device 21 receives no ringing to collect data from the terminal device 37, sends a data collection request message. When the terminal device 37 makes a call for transmitting information to the center device 21 and receives a response signal from the center device 21 in response to the call, The information transmission request message is transmitted to the terminal device 37 by the information transmission request transmission means 5.

Further, as shown in FIG. 1 (b), the data transmission apparatus of the present invention is such that the center device 21 connected to the communication line 1 through the center side network control device 23 connects the communication line 1 to the terminal network. The terminal device 37 connected via the control device 35 is called with no ringing incoming, the data is collected from the terminal device 37 to the center device 21, and the center device 21 is called from the terminal device 37 and the center device 21 is called from the terminal device 37. A data transmission device for transmitting information to the terminal device 37
Is a collected data transmitting means 8 for transmitting collected data to the terminal side network control device 35 when the data request start signal is received from the terminal side network control device 35, and an information transmission request message from the terminal side network control device 35. When the information is received, the gist of the present invention is to have the information transmitting means 9 for transmitting the corresponding information to the center device 21.

(Operation) In the data transmission device of the present invention, the terminal side network control device transmits a data collection request message to the terminal device and receives a response signal from the center device in response to the call from the terminal, when the center device receives the no ringing call. In this case, the information transmission request message is transmitted to the terminal device.

Further, in the data transmission device of the present invention, the terminal device transmits the collected data when the data request activation signal is received, and transmits the corresponding information when the information transmission request message is received.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 2 is a system configuration diagram of a data transmission device according to an embodiment of the present invention. The data transmission device shown in the figure is a host computer for calling a terminal device including meters for water, gas, electric power, etc. through a telephone line with no ringing incoming call to automatically read the meters and collect usage data. In addition to having the no-ringing calling system center device 21a consisting of, when each terminal device makes a call, the call from the calling terminal device is received, and security information such as gas leak is transmitted from the terminal device. It has a terminal calling center device 21b.

The no-ringing calling system center device 21a and the terminal calling center device 21b are connected to the no-ringing calling center side network control device 23a and the automatic side receiving function side center control device 23b, respectively. , b is connected to the telephone exchange network 27 via the center side telephone line 25.

The telephone exchange network 27 includes a transmitting side telephone exchange station 29 connected to the center side telephone line 25, and an interoffice telephone line to the transmitting side telephone exchange station 29.
It has a called telephone switching center 31 connected via 30 and a no ringing trunk 41 connected to the called telephone switching center 31 for making no ringing calls. The terminal side telephone line 33 connected to the receiving side telephone exchange station 31 of the telephone exchange network 27 is connected to the terminal side telephone line 33 through the terminal side network control unit 35, which is a terminal device which is various meters for measuring water, gas, electric power and the like. A plurality of 37 are connected and a general telephone 39 is also connected in parallel. In addition, no ringing trunk 41
Is a terminal side network control device connected to the terminal side telephone line 33
It is a trunk for making no ringing call to the terminal side network control device 35 so that the bell of the telephone 39 does not ring out of the 35 and the telephone 39.

In the data transmission device configured as described above, the no-ringing paging center device 21a is a terminal device via the center side network control device 23a and the telephone exchange network 27 in order to collect meter reading data from each meter which is each terminal device 37. No ringing call is made to the side network control unit 35 and the terminal side network control unit 35
And collects meter reading data from the meter 37 under the control of the terminal side network control device 35, and the terminal device 37 sends the above-mentioned security information to the terminal calling center device 21b. A call is made by itself for transmission, and the terminal call center is received by the terminal call center device 21b via the terminal side network control device 35, the telephone switching network 27, and the center side network control device 23b with an automatic call reception function. The device 21b is connected to transmit security information.

FIG. 3 (a) is a block diagram showing the configuration of the terminal side network control device 35. The terminal side network control device 35 shown in the figure has an output side connected to the terminal side telephone line 33, and is connected in parallel to the automatic transmission network control unit 11 for making a terminal call and the automatic transmission network control unit 11. No ringing calling system center device 21a
Connected to the no-ringing incoming network control section 12 for accepting a no-ringing incoming call from the input side and the input side of the automatic outgoing-call network control section 11 for demodulating a signal from the center device or modulating / demodulating a signal to the center device. 14, a signal switching unit 15, a serial data input / output unit 16, a CPU 13 that controls the overall operation, and a transmission / reception with a terminal device 37 via a connection line 7 by a two-wire system. It is composed of a 2-line to 4-line converter 17 which is a signal converter.

The signal switching unit 15 connects between the modulation / demodulation unit 14 and the serial data input / output unit 16 under the control of the CPU 13, and connects between the 2-wire to 4-wire conversion unit 17 and the serial data input / output unit 16. It is a circuit that controls switching so that the 2-wire to 4-wire conversion unit 17 and the modulation / demodulation unit 14 are connected.

FIG. 3 (b) shows a terminal device connected via a connection line 7.
7 is a circuit diagram showing an interface section between 37 and a terminal side network control device 35. FIG. The connection line 7 is composed of two lines of a signal line DT and a signal line SG, and the signal line DT is returned to the signal line SG via the phototransistor 40t of the photocoupler 40 in the terminal side network control device 35. In the terminal device 37, the signal line DT is connected to the movable contact of the transfer switch 43, and the signal line SG is connected to the transfer switch 45.
Connected to the movable contact of. Transfer switch 43
The break contact is connected to ground and the maker contact is connected to the voltage V _DD via a resistor. The make contact of the transfer switch 45 is connected to ground and the break contact is connected to the voltage V _DD via a resistor and to the input of the receive buffer 47.

Further, in the terminal side network control device 35, both ends of the connection line 7, that is, the phototransistor 40t of the fetocoupler 40
A light emitting diode 49d of a photocoupler 49 is connected in parallel with. The light emitting diode 40d of the photocoupler 40 receives the signal transmitted from the center device, and the phototransistor 49t of the photocoupler 49 transmits the signal received by the center device. In this way, the terminal side network control device 35 and the terminal device 37 connected by the connecting line 7 are electrically separated by the photo coupler 40 and the photo coupler 49.

 Next, the operation will be described.

First, with reference to FIGS. 4 (a) and 4 (b), an operation of collecting data from the terminal device 37 by receiving a no ringing call from the no ringing calling system center device 21a to the terminal device 37 will be described. FIG. 4 (a) is a diagram showing the data transmission means at the time of no ringing incoming call, and FIG. 4 (b) is a data communication timing diagram at the time of no ringing incoming call.

First, when the no-ringing calling method center device 21a activates the exchange 27 to perform no-ringing communication, the exchange 27
Captures the no-ringing trunk 41, reverses the polarity of the telephone line through the no-ringing trunk 41, and makes a no-ringing call to the terminal side network control device 35 (process S100 in FIG. 4 (a)). When the terminal side network control device 35 detects this no-ringing incoming call and returns a response signal (ANS) to the no-ringing trunk 41, the no-ringing trunk
41 is a terminal-side network control device 35 by polarity reversal with respect to the no-ringing paging center device 21a via the exchanges 31 and 39.
Is returned (step S110).

When the response signal by polarity reversal is returned to the no-ringing paging center device 21a and the telephone line between the no-ringing paging center device 21a and the terminal side network control device 35 is completely connected, the no-ringing paging center device 21a Sends a terminal activation command message to the terminal side network control device 35. When the terminal side network control device 35 receives this terminal activation command message, it transmits a "meter reading data request message, that is, a data collection request message" to the terminal device 37, and requests the terminal device 37 to collect meter reading data. The terminal device 37 is activated. That is, the terminal-side network control device 35 activates the photocoupler 40 to turn on / off the phototransistor 40t of the photocoupler 40, as indicated by a meter reading data request message in (a) of FIG. 4B. As a result, the terminal device 37 is activated via the connection line 7 (process S120).

In this start-up operation, when the phototransistor 40t of the terminal side network control device 35 is turned on, the connection line 7 is connected to the signal line SG of the connection line 7 from the voltage V _DD via the break contact of the transfer switch 45 of the terminal device 37. Terminal side network controller 35
Through the phototransistor 40t, the signal line DT of the connection line 7 and the break contact of the transfer switch 43 of the terminal device 37, and as shown in (d) of FIG. A current that matches the current flows.
This meter reading data request current is received by the reception buffer 47 of the terminal device 37.
Is detected via this, and the terminal device 37 is activated accordingly.

When the terminal device 37 is activated by receiving the “data collection request message”, its own data, for example, the terminal device 37 is gas,
In the case of water meters, electricity meters, etc., the meter reading data is transmitted to the no-ringing calling method center device 21a via the terminal side network control device 35, the telephone exchange network 27 and the no ringing calling center side network control device 23a, and communication is performed. Start (Process S
130). That is, in this transmission operation, the terminal device 37 operates its own transfer switch 45 to close the make contact and supply the ground from the transfer switch 45, and in this state, as meter reading data in (b) of FIG. 4 (b). As shown, the transfer switch 43 is turned on / off.
When the transfer switch 43 is turned on / off, a current flows from the voltage V _DD of the terminal device 37 to the connection line 7 as shown as meter reading data in (d) of FIG. The photocoupler 40 of the terminal side network control device 35 is turned on / off, and this on / off signal is modulated by the terminal side network control device 35 and transmitted as transmission data to the no ringing paging center device 21a as described above. .

The no-ringing calling center device 21a is the terminal device 37.
When receiving the data from, the electronic message 1 is transmitted to the terminal device 37. The terminal device 37 returns the response signal 1 to the electronic message 1 to the no-ringing calling system center device 21a. Hereafter, the same operation is performed by the no-ringing call center device 21.
This is repeated until a transmits the message n and the terminal device 37 returns the response signal n (process S140).

When the transmission and reception of all the telegrams and response signals are completed, the no-ringing paging center device 21a transmits a transmission end telegram to the terminal device 37. Upon receiving the transmission end data, the terminal device 37 restores the transfer switches 43 and 45 and ends the transmission process with the no-ringing paging center device 21a (process S150).

On the other hand, when the center device 21a transmits a transmission end message to the terminal device 37, it performs a line recovery operation for the telephone switching network 27. In response to this restoration operation, the telephone exchange network 27 restores the polarity reversal to the terminal side network control device 35, and also restores the polarity reversal to the no-ringing paging center device 21a, thereby capturing the telephone line. Is opened (process S160).

Next, the operation of transmitting security information from the terminal device 37 to the terminal calling center device 21b by the terminal calling operation from the terminal device 37 will be described with reference to FIGS.

FIG. 5 (a) shows a series of data transmission procedures when a terminal is called, and FIG. 5 (b) calls the terminal calling center device 21b from the terminal device 37 when the terminal is called and the center device 2 is called.
An incoming call response signal is supplied from 1b to the terminal side network control device 35,
This shows the timing until the terminal side network control device 35 supplies the "security information request message, that is, the information transmission request message" to the terminal device 37 and activates the terminal device 37.

First, the terminal device 37 turns on the transfer switch 43 of the terminal device 37 in order to call the terminal calling center device 21b, as indicated by a terminal call request in FIG. Switch 45 off, 5th
As shown in (d) of FIG. 2 (b), a current is caused to flow through the photocoupler 40 of the terminal side network control device 35 via the connection line 7, thereby notifying the terminal side network control device 35 of the calling of the terminal device 37. At the same time, the terminal device 37 turns on / off the transfer switch 43 to set the telephone number of the terminal calling center device 21b to the terminal side network as shown in (b) and (d) of FIG. 5 (b). It is transmitted to the control device 35 (process S200 in FIG. 5 (a)).

When the terminal side network control device 35 receives a call and a telephone number from the terminal device 37, it closes the loop of the telephone line, activates the telephone exchange network 27, and receives a dial tone from the telephone exchange network 27. Upon receiving the dial tone from the telephone exchange network 27, the terminal side network control device 35 transmits the telephone number of the terminal calling center device 21b received from the terminal device 37, that is, the dial number (process S210).

The telephone exchange network 27 includes the terminal side network control device 35 to the center device 21.
When the telephone number of b is received, a calling signal is sent to the terminal calling center device 21b, and at the same time, a calling tone is returned to the terminal side network control device 35 (process S220). When called by the calling signal from the telephone switching network 27, the terminal calling center device 21b closes the loop of the telephone line. When the center device closes the loop of the telephone line, the telephone switching network
27 detects this, and reverses the polarity of the telephone line to the terminal side network control device 35 (process S230). Following this operation, the terminal calling center device 21b transmits an incoming call response signal to the terminal side network control device 35 via the telephone exchange network 27. When the terminal side network control device 35 receives the incoming call response signal from the terminal calling center device 21b, it sends a "security information request message, that is, an information transmission request message" to the terminal device 37, and the security information from the terminal device 37 is sent. The terminal device 37 is activated so as to promote the transmission of the. In this case, as shown in (a) and (d) of FIG. 5 (b), the photocoupler 40 is turned on / off, whereby a current is passed through the connection line 7 and the terminal device 37 is activated (process S240). ).

When the terminal device 6 receives and activates the "information transmission request message", it transmits security information to the terminal calling center device 21b and starts communication. Hereinafter, as in the case of the no ringing communication described above, the terminal calling center device 21b
From the desired message n, the terminal device 37 transmits the message 1 to the terminal device 37, and the terminal device 37 sends back the response signal 1 in response.
And repeat until the response signal n (process S250).

When the transmission and reception of all the telegrams and response signals are completed, the terminal calling center device 21b transmits a transmission end telegram to the terminal device 37. Upon receiving this transmission end data, the terminal device 37 restores the transfer switches 43 and 45, and ends the transmission process with the terminal calling center device 21b (process S
260).

On the other hand, when the terminal calling center device 21b transmits the transmission end data to the terminal device 37, it releases the loop of the line to the telephone switching network 27 and restores the polarity reversal to the terminal side network control device 35. The terminal side network control device 35 opens the loop of the telephone line in response to the polarity reversal restoration (process S270).

Next, with reference to FIG. 6, the operation when the no-ringing incoming call and the terminal outgoing call occur at substantially the same time will be described.

As shown in the processing S300 of FIG. 6 and as shown in FIG. 4 (a), the no-ringing paging center device 21a supplements the no-ringing trunk 41 and the terminal side network control device 35.
No ringing call to the terminal side network controller 35
A response signal (ANS) is returned from the telephone switching network 27 in response to the response signal and the no-ringing call center device 21 is sent.
Almost at the same time as the operation in which the response of the terminal side network control device 35 is returned to a by polarity inversion, a terminal call request is output from the terminal device 37 as shown in process S310 in FIG. It is assumed that a terminal calling operation occurs in which the telephone number of the terminal calling center device 21b is transmitted to the side network control device 35.

In the process S300, when the polarity reversal signal is returned to the no-ringing paging center device 21a and the no-ringing paging center device 21a and the terminal side network control device 35 are connected, the no-ringing paging center device 21a
Transmits a terminal activation command message to the terminal side network control device 35 (process S320). In this case, in the conventional method, the terminal side network control device 35 simply responds to this terminal activation command.
Since only the 37 was activated, the terminal device 37 itself is also making a call to the terminal.Therefore, this activation is mistaken for the incoming call response signal from the terminal calling center device 21b for the terminal call and the security information is No-ringing call center device
However, in the present embodiment, when the terminal side network control device 35 receives the terminal activation command message from the no-ringing calling method center device 21a, the "data collection request message, that is, the data collection request message is transmitted. "
Is transmitted to the terminal device 37 to be activated (process S330), the terminal device 37 receives the "data collection request message" even while the terminal is calling, and the meter reading data is sent to the no-ringing call center device 21a. Therefore, the security information is prevented from being erroneously transmitted to the no-ringing paging center device 21a. (Processing S340).

The above embodiment is applied when the connection between the terminal device 37 and the terminal side network control device 35 is made by using the photocouplers 40 and 49 as shown in FIG. 3 (b). However, the present invention is not limited to this, and may be applied, for example, when the two are directly connected without using a photocoupler.

FIG. 7 is a circuit diagram in which a transistor is directly connected between the terminal side network control device 35 and the terminal device 37. In the figure, the transmission line 7 (DT, SG) connecting the two is
This is performed by directly connecting the transmission transistors 201 and 101 provided in the terminal side network control device 35 and the terminal device 37, respectively. Both devices 35, 37 include a switch 203, which supplies the voltage V _DD to the transmission transistors 201, 101, respectively.
The terminal side network control device 35 is provided through this switch.
From the terminal side network control device 35 to start the terminal device 37 from the terminal device or to transmit a transmission end signal transmitted from the center device.
Notify 37 and end communication. Further, the call origination detection buffer 205 and the reception data buffer 207 are connected to the collector of the transmission transistor 201 of the terminal side network control device 35,
Further, a calling detection buffer 105 and a reception buffer 107 are connected to the collector of the transmission transistor 101 of the terminal device 37.

FIG. 8 (a) is a timing chart of the circuit of FIG. 7 in the case of no ringing incoming call. When the terminal side network control device 35 receives the no ringing incoming call signal and the terminal start command message from the no ringing calling system center device 21a, The switch 203 of itself is turned on to supply a voltage from the terminal side network control device 35 to the terminal device 37 for activation, and at the same time, a meter reading data request message is transmitted. When the terminal device 37 detects the meter reading data request message, the terminal device 37 turns on / off the transmission transistor 101 to transmit the meter reading data. Further, in the communication from the no-ringing paging center device 21a to the terminal device 37, the transmission signal from the center device is transmitted by turning on / off the transmission transistor 201 of the terminal side network control device 35. At the end of communication, the center device releases the line, which restores the polarity of the line, so the network control device 35 detects this and turns off the switch 203.
As a result, the network control device 35 notifies the terminal device 37 of the end of communication. That is, the network control device 35 turns off the switch 203, thereby turning off the voltage to the terminal device 37 via the transmission line 7, thereby notifying the end of communication.

FIG. 8 (b) is a timing chart of the circuit of FIG. 7 in the case of a terminal call, but when the terminal device 37 makes a call, the switch 103 of the terminal device 37 is turned on and the terminal side network is turned on. A starting voltage is applied to the control device 35. Then, the transmission transistor 101 is turned on / off to transmit the telephone number. In addition, the terminal side network control device 35 to the terminal calling center device 21b
When the connection is completed and the incoming call response signal is transmitted from the terminal calling center device 21b, the switch 203 is turned on to activate the terminal device 37, and at the same time, the security information request message is transmitted. Upon receiving the security information request message, the terminal device 37 turns on / off the transmission transistor 101 to send the security information. When the transmission is completed and the normal termination response signal is received from the center device, the transmission transistor 201 of the terminal side network control device 35 operates, and in response thereto, the switch 203 is turned off, whereby the transmission line 7 is transmitted. The termination of communication is notified by turning off the voltage to the terminal device 37.

Next, referring to the connection procedure of FIGS. 9 (a) and 9 (b),
The operation of another embodiment of the present invention will be described. FIG. 9 (a),
In the embodiment shown in (b), the terminal side network control unit 35 is activated from the center unit even in the case of no ringing incoming and terminal calling in order to prevent the above-mentioned collision between no ringing incoming and terminal calling. In any case, the terminal device 37 operates so as to transmit the meter reading data, and the security information is transmitted from the terminal device 37 only when the security information request data is transmitted from the terminal calling center device 21b.

FIG. 9 (a) is a diagram showing a connection procedure in the case of a terminal call. In the figure, the processes from the terminal side network control device 35 to the terminal calling center device 21b shown in processes S200 to 230 and the ending process shown in processes S260 and 270 are the same as those in FIG. 5 (a). Process shown with the same process number
Same as S200-230 and 260,270.

When the connection from the terminal side network control device 35 to the terminal calling center device 21b is completed and an incoming call response signal is transmitted from the terminal calling center device 21b to the terminal side network control device 35,
The terminal-side network control device 35 transmits a terminal device activation signal to the terminal device 37 (process S440).

As a result, the terminal device 37 is configured to always transmit the "meter reading data" to the center device in response to the activation signal (process S450). Therefore, as in the prior art, even if there is a no ringing incoming call at this time, the security information is erroneously transmitted to the no ringing calling method center device 21a, and the security information is not lost.

In this way, the meter reading data is configured to be always transmitted first, and the security information is transmitted from the terminal device 37 to the terminal calling center only when the security information request data is transmitted from the terminal calling center device 21b after this. Device 21b
To be sent to (step S460).

FIG. 9 (b) is a diagram showing a connection procedure in the case of no ringing incoming call. In the figure, processing S100, 110 and 15
0 and 160 are the same as the processes S100, 110 and 150, 160 shown with the same process symbols in FIG. 4 (a) described above.

When the connection between the no-ringing paging center device 21a and the terminal side network control device 35 is completed and the terminal activation request data is transmitted from the no-ringing paging center device 21a, the terminal side network control device 35 A terminal activation signal is transmitted to 37 (process S520).

As a result, the terminal device 37 transmits the meter-reading data to the no-ringing calling system center device 21a in response to the activation signal (process S530).

Further, if the no-ringing calling method center device 21a transmits a telegram after collecting the meter reading data, response data in response to this is returned from the terminal device 37 (process S54
0). The subsequent communication termination operation is the same as that described above.

[Effects of the Invention] As described above, according to the present invention, when the center device receives an incoming call with no ringing, the data collection request message is transmitted to the terminal device, and the response signal from the center device to the call from the terminal is received. In this case, the information transmission request message is transmitted from the terminal side network control device to the terminal device. Further, the terminal device transmits the collected data when receiving the data request activation signal, and transmits the corresponding information when receiving the information transmission request message. Therefore, even if the no-ringing incoming call and the terminal outgoing call occur almost simultaneously and collide with each other, it is possible to perform a proper data transmission operation without transmitting erroneous data.

[Brief description of the drawings]

1 (a) and 1 (b) are diagrams corresponding to the claims of the present invention, and FIG.
FIG. 1 is a block diagram showing a system configuration of a data transmission device according to an embodiment of the present invention, and FIGS. 3 (a) and 3 (b) are respectively a terminal side network control device used in the data transmission device of FIG. A block diagram showing the configuration and a circuit diagram showing the connection between the terminal side network control device of the data transmission device of FIG. 2 and the terminal device, and FIGS. 4 (a) and 4 (b) are respectively the data transmission of FIG. FIG. 5 is a diagram and a timing diagram showing a transmission connection procedure when the device receives no ringing, and FIGS. 5A and 5B are diagrams and timing diagrams showing a transmission connection procedure when the terminal of the data transmission device of FIG. 2 is called. FIG. 6 is a diagram showing a connection procedure when a no-ringing incoming call and a terminal call of the data transmission device of FIG. 2 collide, and FIG. 7 is a terminal side network control device and a terminal device of the data transmission device of FIG. FIG. 8 is another circuit diagram showing the connection between a), (b) is a timing diagram illustrating the operation of the circuit of Figure 7, Figure 9 (a), a diagram showing a (b) is connected procedure in other data transmission device of the present invention. 1 ... communication line 3 ... data collection request message sending means 5 ... information transmission request sending means 8 ... collected data sending means 9 ... information sending means 21a ... no-ringing call center device 21b ... for terminal calling Center device 23a …… Center side network controller for no ringing call 23b …… Center side network controller with automatic call receiving function 27 …… Telephone switching network 35 …… Terminal side network controller 37 …… Terminal device

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Nagatake Uno 1-5-20 Kaigan, Minato-ku, Tokyo Within Tokyo Gas Co., Ltd. (72) Inventor Chotaro Murakami 1-1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Toshihiko Kawai 70 Yanagi-cho, Sachi-ku, Kawasaki-shi, Kanagawa Stock company Toshiba Yanagimachi factory (72) Inventor Yuji Mihara 70, Yanagi-cho, Kawasaki-shi, Kanagawa Stock company Toshiba Yanagi-cho In-plant (72) Inventor Hiroto Uyama 70 Yanagi-cho, Sachi-ku, Kawasaki-shi, Kanagawa Stock company Toshiba Yanagi-cho In-plant (56) Reference JP-A-58-97953 (JP, A) JP-A-58-181357 (JP , A)

Claims (2)

(57) [Claims] 1. A center device connected to a communication line via a center side network control device calls a terminal device connected to a communication line via a terminal network control device with no ringing incoming, and from the terminal device. Collect data in the center device, call the center device from the terminal device,
A data transmission device for transmitting information from a terminal device to a center device, wherein the terminal-side network control device sends a data collection request message to the terminal device when the center device receives a no ringing call to collect data from the terminal device. When the terminal device makes a call to send information to the center device and a response signal is received from the center device in response to the call, the information collection request message sending device sends the information transmission request message to the terminal device. And a data transmission request transmitting means for transmitting to the data transmission device. 2. A center device connected to a communication line via a center side network control device calls a terminal device connected to a communication line via a terminal network control device with no ringing incoming, and from the terminal device. Collect data in the center device, call the center device from the terminal device,
A data transmission device for transmitting information from a terminal device to a center device, wherein the terminal device, when receiving a data request activation signal from the terminal side network control device, transmits the collected data to the terminal side network control device. When the information transmission request message is received from the collected data transmission means and the terminal side network control device,
A data transmission device, comprising: information transmission means for transmitting corresponding information to a center device.