JP2000307752A - Line terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restore a telephone set to an original connecting state even when the telephone set is disconnected from a public line due to that the changeover section of the telephone set receives vibration or impact. SOLUTION: When a vibration sensor 18 detects impact via a mount section 19 and outputs a vibration sensing signal, a data terminal 2 transmits a start message to a relay control section 17. The relay control section 17 receiving the start message outputs a pulse control signal to restore a relay. That is, the relay control section of the line terminal receiving the start text immediately restores a self-hold relay to reconnect a telephone set to a public line. Thus, it is prevented that the telephone set is out of order or no ringing is produced even when an external phone call reaches the telephone set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transferring data from a data terminal device such as a home security panel or a gas shutoff device to a central monitoring device by terminal call communication or no ringing communication using a public line network. Related to the line terminal device.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional line terminal device 1 of this type is a device for reporting information of a data terminal device 2 to a central monitoring device 5 via a public line 3 and an exchange 4. Here, the data terminal device 2 is a device with a communication function built in a microcomputer, and is built in a gas meter attached to the customer's house. When an abnormal use of gas is detected, the central monitoring device 5 is called via the line terminal device 1 and the contents thereof. Report.

When the data terminal device 2 detects a gas use abnormality, the data terminal device 2 first transmits a start message having destination telephone number information to the line terminal device 1 to start communication, and transmits the abnormality information to the central monitoring device 5. After the transmission, the communication operation is ended by receiving the communication end message. The line terminal device 1 uses a battery as a power source so that a notification can be made even during a power failure.

The telephone 6 of the customer is connected to the public line 3 via a self-holding relay 11 of a telephone switching unit 10 of the line terminal device 1. 21 is an external telephone.

Next, the configuration of the line terminal device 1 will be described. Reference numeral 7 denotes a terminal interface unit, which is connected to the data terminal device 2 via a signal line to match signals. Reference numeral 8 denotes a modem for modulating and demodulating an analog signal for the public line 3. The transmission signal modulated and demodulated by the modem unit 8 is sent to the central control unit 9.
Is input and output.

Reference numeral 14 denotes a call signal detecting unit which is included in a call signal from the exchange 4 in response to a call from the external telephone 21.
The determination can be made using a circuit that detects 6 Hz.

Reference numeral 16 denotes an off-hook detection unit which determines whether the telephone 6 of the customer is off-hook or on-hook. Reference numeral 10 denotes a telephone switching unit that disconnects or connects the telephone 6 from the public line 3. In the line terminal device 1 using a battery as a power source, if the power is constantly supplied to the telephone switching unit 10, the battery is drastically consumed. Therefore, once the pulse control signal is input, the relay is switched, and a so-called latching relay that holds the state is held. A self-holding relay 11 called as a main component is used.

The self-holding relay 11 switches the telephone 6 to the side for connecting the telephone 6 to the public line 3 when the pulse control signal is input to the A side, and switches the telephone 6 to the public line when the pulse control signal is input to the B side. 3 is separated from the circuit. The self-holding relay 11 of the telephone switching unit 10 is usually on the side where the telephone 6 is connected to the public line 3 (the reverse of the figure). Reference numeral 12 denotes a network control unit that matches communication conditions with the public line 3.

Next, the operation of the terminal call communication will be described with reference to FIG.

First, when a gas leak is detected by the data terminal device 2, a start message in which destination information is set is transmitted.
The central control unit 9 which has received this message via the terminal interface unit 7 makes a call signal detection unit 14, an off-hook detection unit 1
In step 6, it is checked whether a call is received, the telephone 6 is not in use, and the like, and whether or not a call can be made is confirmed.

If the call cannot be made, the terminal call is interrupted, and if the call can be made, the terminal call is continued. When the call is continued, even if the telephone 6 is used by the customer during the communication, the pulse control signal is transmitted from the central control unit 9 to the self-holding relay 11 so that the communication of the line terminal device 1 is not affected. Of B
Side, the self-holding relay 11 of the telephone switching unit 10
Is switched to the side that disconnects the telephone 6 from the public line 3 (same as in the figure), and the state is maintained.

Next, after the loop of the public line 3 is closed by the network control unit 12, dialing is performed based on the destination information of the activation message to match the communication conditions with the exchange 4 and centrally monitor. The device 5 is called. Upon receiving the call signal from switching center 4, central monitoring device 5 connects the line and transmits an incoming response signal to line terminal device 1.

The signal reaches the line terminal 1 via the exchange 4 or the public line 3 and is demodulated by the modem unit 8. The central control unit 9 analyzes the signal demodulated by the modem unit 8, and if it is determined that the signal is an incoming response signal from the central monitoring unit 5, the information request message is transmitted from the central control unit 9 to the data terminal unit via the terminal interface unit 7. Send to 2.

When the data terminal device 2 receives the information request message, it responds with a message to which information of the activation factor is added. The message sent from the data terminal device 2 is received by the terminal interface unit 7, is modulated into an analog signal by the modem unit 8 via the central control unit 9, and is modulated by the central monitoring unit 5 via the public line 3 and the exchange 4. Transferred to

When the message is received by the central monitoring device 5, the central monitoring device 5 transmits a communication end message to the line terminal device 1 to end the communication. The line terminal device 1 transfers the communication end message to the data terminal device 2 to end the communication with the central monitoring device 9.

At the end of communication, the central control unit 9
To release the loop of the public line 3 to the exchange 4
To the public line 3, disconnect the communication path with the public line 3, add a pulse control signal to the A side of the self-holding relay 11 of the telephone switching unit 10, and return the telephone 6 to the public The terminal call communication is terminated by connecting to the line 3 (reverse to the figure).

[0017]

However, in the above-described configuration, the self-holding relay 11 used in the telephone switching unit 10 is vulnerable to vibrations and external shocks.
The status of the relay changes immediately.

For this reason, a large earthquake occurs after the line terminal device 1 is installed at the eaves or the like, and the telephone 6 is disconnected from the public line 3 by an accident such as the house being collapsed and hitting a permanent object or hitting a baseball ball. When the self-holding relay 11 changes to the side, the telephone 6
Will remain disconnected from. Then, when the telephone 6 is called from the external telephone 21, the bell of the telephone 6 does not ring and the customer cannot be called even if the telephone call signal is transmitted from the exchange 4, or the telephone 6 is used to talk to the external telephone 21. There is a problem that the telephone 6 is not connected to the public line 3 so that the external telephone 21 cannot be called.

[0019]

According to the present invention, there is provided a line terminal device connected to a telephone and connected to an external device such as a central monitoring device via a public line. And a telephone switching unit that disconnects the telephone from the public line during terminal call communication by means of a self-holding relay and connects the telephone to the public line except for terminal call communication. A data sensor device that detects shocks and vibrations, a data terminal device that determines the seismic signal from the sensor and sends a startup message when a certain amount of shock or vibration occurs, and a data terminal device. Pulse control is provided to the self-holding relay of the telephone switching unit so that the terminal interface unit for transmission and reception and the activation message transmitted from the data terminal device are received and the telephone is connected to the public line. A relay control section for outputting a signal, and has a mounting portion for an integral structure and a seismic sensor and a data terminal equipment.

According to the above-mentioned invention, when a sudden impact such as a baseball ball hits the line terminal device or the like, the seismic sensor, the data terminal device and the line terminal device are integrally configured by the attachment portion. Therefore, the seismic sensor detects a vibration or shock and outputs a seismic signal. The data terminal device that has received this seismic signal transmits a start message to the line terminal device via the terminal interface unit, so the relay control unit uses the self-holding relay of the telephone switching unit to connect the telephone to the public line. Outputs the pulse control signal. Therefore, even if the self-holding relay of the line terminal device is changed to the side that disconnects the telephone from the public line due to vibration or shock, the relay control unit controls the self-holding relay of the telephone switching unit to connect the telephone to the public line. As a result, it is possible to prevent the ringing of the telephone from ringing even when a telephone call is made from the outside, and to avoid a complaint that the connected telephone cannot be used.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A line terminal device according to the present invention is connected to a telephone and connected to an external device such as a central monitoring device via a public line. And a telephone switching unit that disconnects the telephone from the public line during terminal call communication by a self-holding relay and connects the telephone to the public line except for terminal call communication. A seismic sensor to detect, a data terminal device that determines the seismic signal from the seismic sensor and sends a startup message when a certain level of impact or vibration occurs, and a terminal interface unit that sends and receives messages with the data terminal device And a relay that outputs a pulse control signal to the self-holding relay of the telephone switching unit so as to connect the telephone to the public line when receiving the activation message transmitted from the data terminal device. And-controlled unit, and has a mounting portion for an integral structure and a seismic sensor and a data terminal equipment.

When the self-holding relay is switched to the side of disconnecting the telephone from the public line due to vibration or impact after installing the line terminal device on the public line, the attachment unit connects the seismic sensor and the data terminal device to the line. Since the terminal device has an integral structure, the seismic sensor detects a vibration or a shock and outputs a seismic signal.

The data terminal device which has received the seismic signal transmits a start message. Then, the relay control unit that has detected the activation message via the terminal interface unit outputs a pulse control signal to the self-holding relay of the telephone switching unit so as to connect the telephone to the public line. Therefore, the self-holding relay of the telephone switching unit can be returned to the original state so as to connect the telephone to the public line.

[0024] In addition to the above configuration, preferably, the line terminal device of the present invention further comprises a data terminal device for transmitting a special message different from a start message when the seismic sensor detects a vibration or an impact, and It has a determination unit that drives the relay control unit only when a message is identified.

When the seismic sensor is activated, the data terminal device transmits a dedicated message, so that the determination unit of the line terminal device drives the relay control unit to output a pulse control signal to the self-holding relay.

Further, the data terminal device transmits a start-up message to call the central monitoring device even when the seismic sensor is not activated, but the judgment unit is transmitted when the seismic sensor detects a certain amount of vibration or impact. Since the dedicated electronic message can be identified, the relay control unit is not driven to output a pulse control signal to the self-holding relay in spite of no vibration or shock. Therefore, when the power supply of the line terminal device is constituted by a battery, a battery having a small battery capacity can be mounted, and the cost can be reduced.

[0027]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a block diagram showing a first embodiment of a line terminal apparatus according to the present invention. Note that components having the same numbers as those in FIG. 3 are components having the same names and the same functions, and descriptions thereof will be omitted. 17 is a relay control unit,
A pulse control signal is output to the A side of the self-holding relay 11 of the telephone switching unit 10 according to an instruction from the central control unit 9,
The telephone 6 is connected to the public line 3. Reference numeral 18 denotes a seismic sensor which outputs a seismic signal to the data terminal device 2 upon detecting a vibration or impact. Reference numeral 19 denotes a mounting portion, in which the data terminal device 2, the seismic sensor 18, and the line terminal device 22 are integrated, and vibrations and shocks received by the line terminal device 22 are transmitted to the seismic sensor 18. ing.

The line terminal device 22 is usually installed at the yard or eaves of each home and connected to the public line 3. Then, when a vibration or shock is generated in the line terminal device 22 such that the self-holding relay 11 is turned to the side where the telephone 6 is disconnected from the public line 3 due to an earthquake, a baseball hit, etc. Vibration and impact are transmitted to the seismic sensor 18 via. The seismic sensor 18 is the data terminal device 2
To output a seismic signal. The data terminal device 2 analyzes the input seismic signal and transmits a start message to the terminal interface unit 7 if the impact is equal to or greater than a certain value. The activation message received by the terminal interface unit 7 is sent to the central control unit 9. When the central control unit 9 recognizes this message, it drives the relay control unit 17 to connect the telephone 6 to the public line 3 so that the self-holding relay 11 of the telephone switching unit 10
Output a pulse control signal to the A side.

Then, the self-holding relay 11, which has been switched due to vibration or impact, returns to its original state, and the telephone 6 is connected to the public line 3. Therefore, even if the self-holding relay 11 is inverted due to a vibration or an impact and is switched to the side where the telephone 6 is disconnected from the public line 3, the self-holding relay 1 is immediately turned on.
Since 1 can be restored, it is possible to prevent that the telephone 6 cannot be used or that the bell of the telephone 6 does not ring even when a call is received from outside.

The data terminal device 2 can be a microcomputer meter which has recently been widely used as a gas shutoff device. This microcomputer meter is integrated with a sensor for detecting an earthquake. Earthquake sensor 1
By sharing the same with 8, it is possible to suppress an increase in cost.

(Embodiment 2) Next, Embodiment 2 of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

FIG. 2 is different from the above embodiment in that
When the seismic sensor 18 detects vibration or impact, the data terminal device 24 transmits a dedicated message instead of a normal start-up message, and includes a determination unit 20 that allows the line terminal device 23 to identify the dedicated message. It is that you are.

Next, the operation will be described with reference to FIG. 2. When the line terminal device 23 receives a message from the data terminal device 24 via the terminal interface unit 7, the judgment unit 20 analyzes it. The judgment unit 20 uses the seismic sensor 1
When a message indicating that the transmitted message has been transmitted is detected when a vibration or shock is detected, the self-holding relay 11 of the telephone switching unit 10 performs pulse control so that the telephone 6 is connected to the public line 3 only at that time. An instruction is given to the relay control unit 17 to output a signal.

Then, the relay control unit 17 sets the telephone switching unit 1
The pulse control signal is output to the A side of the self-holding relay 11 of 0, and the telephone 6 is connected to the public line 27 side.

On the other hand, the data terminal device 24 is
The activation message is transmitted to call the central monitoring device 5 even when the device 8 is not operating.
8 is capable of identifying a special message transmitted when a certain level of vibration or shock is detected, and outputting a pulse control signal to the self-holding relay 11 in spite of no occurrence of vibration or shock. The control unit 17 is not driven.

Accordingly, the determination unit 20 can identify whether the message transmitted from the data terminal device 2 has been transmitted since the seismic sensor has detected a certain level of vibration or impact, and therefore no vibration or impact has occurred. Nevertheless, the power consumption can be suppressed because the relay control unit 17 is not driven to output the pulse control signal to the self-holding relay 11 unnecessarily.

Therefore, when the power supply of the line terminal device is constituted by a battery, a battery having a small battery capacity can be mounted, and it can be realized at low cost.

[0039]

As described above, according to the line terminal device of the present invention, the following effects can be obtained.

(1) According to the first aspect of the present invention, even if the self-holding relay is inverted due to a vibration or an impact and the telephone is switched to a side where the telephone is disconnected from the public line, the generated vibration or the impact is not attached to the mounting portion. The activation telegram is transmitted from the data terminal device which has received the seismic signal output from the seismic sensor transmitted through the sensor. The relay control unit of the line terminal device that has received the activation message immediately returns the self-holding relay to the original state and reconnects the telephone to the public line, so that the telephone cannot be used or even if a telephone call is received from outside, the telephone The bell can be prevented from ringing. In addition, a microcomputer meter that has recently been widely used as a gas shutoff device can be applied to the data terminal device,
Since this microcomputer meter is integrated with a sensor for detecting an earthquake, it is possible to reduce the cost by sharing this sensor with a seismic sensor. (2) According to the invention described in claim 2, For example, in addition to the effect of (1), the pulse control signal is output from the relay control unit to the self-holding relay only when the seismic sensor detects a vibration or an impact. Does not output a control signal to the self-holding relay each time a message is sent from the device. Therefore, an increase in power consumption can be realized in a small amount, so that in a line terminal device using a battery as a power source, it is not necessary to increase the capacity of the battery, thereby preventing an increase in cost.

[Brief description of the drawings]

FIG. 1 is a block diagram of a line terminal device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a line terminal device according to a second embodiment of the present invention;

FIG. 3 is a block diagram of a conventional line terminal device.

[Explanation of symbols]

 Reference Signs List 2 data terminal device 3 public line 4 exchange 5 central monitoring device 6 telephone 7 terminal interface unit 8 modem unit 9 central control unit 10 telephone switching unit 11 self-holding relay 14 call signal detection unit 16 off-hook detection unit 17 relay control unit 18 Seismic sensor 19 Mounting part 22 Line terminal device

Claims (2)

[Claims] 1. A line control unit for connecting communication conditions to a public line network in a line terminal device connected to a telephone and connected to an external device such as a central monitoring device via a public line. During the terminal call communication by the holding relay, the telephone is disconnected from the public line, and except for the terminal call communication, a telephone switching unit for connecting the telephone to the public line, a shock sensor for detecting shock or vibration, A data terminal device for transmitting a start-up message when a shock or vibration exceeding a certain level is determined by determining a seismic signal from the seismic sensor, a terminal interface unit for transmitting / receiving a message with the data terminal device, and the data terminal device A relay that outputs a pulse control signal to a self-holding relay of the telephone switching unit so as to connect the telephone to a public line when receiving a startup message transmitted from the telephone And control unit, the line terminal device and a mounting portion to said data terminal equipment and the integral structure with the seismic sensor. 2. A data terminal device for transmitting a dedicated message different from a starting message when a seismic sensor detects a vibration or an impact, and a determining unit for driving a relay control unit only when the dedicated message is identified. The line terminal device according to claim 1, further comprising: