JPH0723128A - Guard terminal equipment - Google Patents

Abstract

PURPOSE:To attain transmission to a supervisory center by restarting current supply even when an exchange forcibly interrupts the current supply to a telephone line due to long time closing. CONSTITUTION:Upon the receipt of an abnormality detection section S1, a control section 11 uses a changeover relay 3 to throw a telephone line to the position of the terminal equipment and allows a dial relay 4 to close the telephone line. When no current detection signal S2 is inputted after the telephone line is closed, the control section 11 controls the dial relay 4 to open the telephone line for a predetermined time while throwing the telephone line to the position of the equipment and then closes the line thereby monitoring a line current detection section 1. When the current detection signal S2 is received, the supervisory center and the center are connected to make transmission/ reception of the signal to/from the supervisory center.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a security terminal device,
In particular, it relates to a security terminal device that shares a telephone line with a telephone.

[0002]

2. Description of the Related Art In recent years, security terminal devices having sensors for heat, gas, infrared rays, etc. have been installed in buildings, and detection information from these sensors is transmitted from the security terminal devices to a monitoring center via a telephone line. At this monitoring center, a system for remotely monitoring an abnormal situation such as a fire, a gas leak, and illegal intrusion has been realized.

Among such security terminal devices, there is one that shares a telephone line with a telephone and captures the telephone line for transmission when necessary, and therefore the telephone line is switched between the telephone side and the device side. It has line switching means and line opening / closing means for opening and closing the telephone line on the device side.

In this conventional security terminal device, when it becomes necessary to transmit to the monitoring center, the line switching means switches the telephone line to the device side, and the line switching means closes the telephone line to capture the telephone line. After that, the transmission was performed to the monitoring center, and when the transmission was completed, the telephone line was opened, the telephone line was switched to the telephone side, and the telephone line was returned to the telephone side.

Further, if the transmission is unsuccessful, for example, the monitoring center does not respond, the telephone line is once returned to the telephone side, and the retry is performed.

[0006]

By the way, the above security terminal device is used by switching the telephone line, but when the telephone line is connected to the telephone side, the user mistakenly sets the handset. It often happens that the line is closed for a long time, such as by half-hanging. In this case, the exchange forcibly cuts off the current supply to the telephone line, and then intermittently supplies the current for confirming whether the telephone line has been opened to the telephone line, and when it detects that the telephone line has been opened. Restart current supply.

When the sensor detects abnormal information while the current supply to the telephone line is cut off, the security terminal device performs the above-mentioned predetermined operation for transmission, but the current supply to the telephone line is cut off. Since the monitoring center cannot be connected to the telephone line and the monitoring center does not respond, the transmission is unsuccessful and the above retry is performed.

Through the above process, the telephone line remains closed both on the telephone side and on the device side, so that the exchange cannot detect the opening of the telephone line and restart the current supply, and the security guard The terminal device repeats this operation.

Therefore, there occurs a problem that the telephone cannot be transmitted to the monitoring center unless the half of the handset of the telephone is restored and the exchange restarts the current supply.

The present invention has been made in view of the above-mentioned problems of the prior art. Even when the exchange is forced to cut off the current supply to the telephone line due to a long-time closure, The purpose of the present invention is to provide a security terminal device that restarts current supply and enables transmission to a monitoring center.

[0011]

A security terminal device according to the present invention is connected to a monitoring center via a switch by a telephone line shared with a telephone, an abnormality detecting means for detecting an abnormality, and the preset monitoring. Selection signal transmitting means for transmitting the telephone number of the center as a selection signal to the exchange through the telephone line, and a signal according to the abnormality detected by the abnormality detecting means through the exchange through the exchange using the telephone line A signal transmitting / receiving unit for transmitting a signal to the center and receiving a signal transmitted from the monitoring center using the telephone line, and a line switching unit for switching the telephone line to either the telephone side or the signal transmitting / receiving unit side. And a line opening / closing means for opening / closing the telephone line switched to the signal transmitting / receiving means by the line switching means. In the terminal device, a line current detection unit provided on the exchange side of the line switching unit for detecting whether or not a current is supplied from the exchange to the telephone line, and a line current detection unit provided on the exchange side of the line switching unit. An incoming call detecting means for detecting a ringing signal to the telephone line, the abnormality detecting means, the selection signal transmitting means,
The signal transmission / reception means, the line switching means, the line switching means, the line current detection means, and the control means connected to the incoming detection means, respectively, further comprising: If so, after confirming that the ringing signal is not detected by the incoming call detection means and that the current supply is not detected by the line current detection means, the telephone line is not used. The switching means switches the telephone line to the signal transmitting / receiving means side, the line switching means closes the telephone line on the signal transmitting / receiving means side, and the line current detecting means supplies current to the telephone line from the exchange. When the supply of electric current is monitored and it is confirmed that the electric current supply is detected by the line current detecting means, the supervision of the exchange is performed. After transmitting the selection signal for selecting the center from the selection signal transmission means to the exchange, the signal transmission / reception means is caused to transmit a signal corresponding to the abnormality detected by the abnormality detection means, while the line current detection means is provided. When it is confirmed that the current supply is not detected in the current supply monitoring operation, the line switching means opens the telephone line for a certain period of time and then closes the telephone line to monitor the current supply. When the current supply is detected in the current supply monitoring operation,
After transmitting the selection signal from the selection signal transmission means to connect the monitoring center to the telephone line, the signal transmission / reception means transmits a signal according to the abnormality detected by the abnormality detection means via the telephone line. It is characterized by

[0012]

In the security terminal device of the present invention, when the telephone line is closed by the line opening / closing means to send a signal according to the abnormality detected by the abnormality detecting means to the monitoring center, the telephone is detected by the line current detecting means. When the current supply to the line is monitored and the current supply cannot be detected by the line current detection means, the telephone line is opened with the telephone line switched to the device side, and the exchange detects that the telephone line has been opened. The telephone line is opened until a predetermined time set in the control means elapses with reference to the time when the current supply is restarted, and then the telephone line is closed again. By performing the above control, the exchange is made to resume the current supply to the telephone line. After confirming that the current supply has been resumed, a signal corresponding to the abnormality detected by the sensor is sent to the monitoring center.

[0013]

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

FIG. 1 is a block diagram of an embodiment of the present invention.

The security terminal device 20 of the present embodiment includes a line current detector 1, an incoming call detector 2, a switching relay 3, contacts 3a and 3b of the switching relay 3, a dial relay 4, and a dial relay 4. Contact 4a, resistor 5, capacitor 6
A transformer 7, an MF signal transmitter 8, a signal transmitter / receiver 9, a sensor detector 10, and a controller 11.

The security terminal device 20 includes a sensor 12 for detecting heat, gas, infrared rays, etc. and telephone lines (two-wire type) 14a, 14 for detecting an abnormal situation such as a fire, gas or illegal intrusion.
b is connected.

Information from the sensor 12 is received by the sensor detection unit 10, and when the sensor detection unit 10 detects an abnormality, it outputs an abnormality detection signal S1 indicating that the abnormality has been detected to the control unit 11.

Telephone line 1 connected to the security terminal device 20
4a and 14b are branched in the device, and the telephone 13 is connected to one of the branched telephone lines 14a and 14b.
That is, the telephone 13 is connected to the telephone lines 14a and 14b via the security terminal device 20 and shares one line. Telephone lines 14a, 1 connected to the security terminal device 20
First, the line current detector 1 and the incoming call detector 2 are provided on 4b, and then the two lines of the telephone lines 14a and 14b are
The contacts 3a and 3b are respectively connected and branched in two directions. As described above, the telephone 13 is connected to one of the branched telephone lines 14a and 14b, and the other side is provided with the contact 4a, which is then DC-separated by the transformer 7 to form the MF signal transmitting unit 8. The signal transmitting / receiving unit 9 is connected.

The line current detection unit 1 detects whether or not a current is supplied from the exchange 13 to the telephone lines 14a and 14b, and outputs a current detection signal S2 indicating the detection to the control unit 11. The incoming call detection unit 2 detects a ringing signal from the exchange and outputs an incoming call detection signal S3 indicating the detection to the control unit 11
Output to. The line current detector 1 and the incoming call detector 2 may be installed on the telephone lines 14a and 14b in the reverse order.

The control unit 11 operates in accordance with the abnormality detection signal S1 from the sensor detection unit 10, the current detection signal S2 from the line current detection unit 1, and the incoming detection signal S3 from the incoming call detection unit 2, and the switching relay 3 and the dial relay. 4, controlling the MF signal transmitter 8 and the signal transmitter / receiver 9.

The switching relay 3 controls the contacts 3a and 3b by a signal from the control unit 11, and the contacts 3a and 3b.
b connects the connected telephone lines 14a and 14b to the telephone 13
Side or inside of the device.

The dial relay 4 controls the contact point 4a by a signal from the control unit 11, and the contact point 4a is installed on the telephone line 14a to open and close the telephone lines 14a and 14b. The resistor 5 and the capacitor 6 are connected in parallel to the contact 4a as an RC series circuit to remove noise when the contact 4a operates.

The MF signal transmission / reception unit 8 outputs a selection signal to the telephone lines 14a and 14b to cause the exchange to select the monitoring center in response to a signal from the control unit 11. The signal transmitting / receiving unit 9 is connected to the control unit 11 and transmits / receives signals to / from the monitoring center via the telephone lines 14a and 14b.

The transformer 7 separates the MF signal transmitter 8 and the signal transmitter / receiver 9 from the telephone lines 14a and 14b by direct current.

Next, the operation will be described.

When the sensor 12 detects an abnormality and the abnormality detection signal S1 is input from the sensor detection unit 10, the control unit 11 firstly outputs the current detection signal S from the line current detection unit 1.
2 and the incoming call detection signal S3 from the incoming call detection unit 2 are monitored.
After confirming that neither the current detection signal S2 nor the incoming call detection signal S3 is input, that is, the telephone lines 14a and 14b are not used, the control unit 11 controls the switching relay 3 to control the telephone line 14a. , 14b are switched to the device side, the dial relay 4 is controlled, and the telephone line 14
Close a and 14b. When the telephone lines 14a and 14b are in use, the above operation is executed after the use is completed.

After the telephone line is closed, the control unit 11 monitors the line current detection unit 1 and when the current detection signal S2 is input,
A selection signal is sent from the MF signal sending unit 8 to the monitoring center. When the monitoring center and the security terminal device 20 are connected via the telephone lines 14a and 14b, signals are transmitted / received via the signal transmitting / receiving unit 9.

When the current detection signal S2 is not input after the telephone line is closed, the control section 11 determines that the exchange is forcibly cutting off the current supply and performs the following control.

The control unit 11 controls the dial relay 4 while keeping the telephone lines 14a and 14b switched to the device side to open the telephone lines 14a and 14b for a certain period of time. The time during which the telephone lines 14a and 14b are opened is set in advance in the control unit 11 with reference to the time when the exchange detects the line opening and resumes the current supply.

The control unit 11 controls the telephone line 14a,
After opening 14b, the dial relay 4 is controlled again to close the telephone lines 14a and 14b, and the line current detector 1 is monitored. When the current detection signal S2 is input, the monitoring center and the telephone lines 14a and 14b are connected to transmit and receive signals to and from the monitoring center. If the current detection signal is not input, the telephone lines 14a and 14b are opened again for a certain time, and the above control is repeated until the current detection signal is input.

In this way, the security terminal device 20 according to the present embodiment is constructed by closing the telephone lines 14a and 14b for a long time.
Even when the exchange has forcibly cut off the current supply to the telephone lines 14a and 14b, the current supply is restarted and a signal is sent to the monitoring center.

[0032]

Since the present invention is configured as described above, it has the following effects.

When the current supply to the telephone line is monitored when the telephone line is closed and the current supply cannot be detected, the telephone line is opened while the telephone line is switched to the device side, and the telephone line is opened by the exchange. Is detected and the telephone line is closed again after the time when the current supply is restarted, so even if the exchange forcibly cuts off the current supply to the line, the current supply is restarted and a sensor is sent to the monitoring center. The abnormal information detected by can be transmitted.

[Brief description of drawings]

FIG. 1 is a connection diagram showing an embodiment of the invention.

[Explanation of symbols]

 1 line current detection unit 2 incoming call detection unit 3 switching relay 3a, 3b contact point 4 dial relay 4a contact point 5 resistor 6 capacitor 7 transformer 8 MF signal transmission unit 9 signal transmission / reception unit 10 sensor detection unit 11 control unit 12 sensor 13 telephone 14a, 14b Telephone line 20 Security terminal device S1 Abnormality detection signal S2 Current detection signal S3 Incoming call detection signal

[Procedure amendment]

[Submission date] November 10, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

By the way, the above security terminal device is used by switching the telephone line, but when the telephone line is connected to the telephone side, the user mistakenly sets the handset. If you are not in a call , for example, half-hanging
It is also a long time line, regardless of is閉結(disabled pending shape
State) it is often occur. In this case, the exchange forcibly cuts off the current supply to the telephone line, and then intermittently supplies current to the telephone line to check whether the telephone line has been opened.
When it is detected that the telephone line has been opened, the current supply is restarted.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

[0011]

A security terminal device according to the present invention is connected to a monitoring center via a switch by a telephone line shared with a telephone, an abnormality detecting means for detecting an abnormality, and the preset monitoring. Selection signal transmitting means for transmitting the telephone number of the center as a selection signal to the exchange through the telephone line, and a signal according to the abnormality detected by the abnormality detecting means through the exchange through the exchange using the telephone line A signal transmitting / receiving unit for transmitting a signal to the center and receiving a signal transmitted from the monitoring center using the telephone line, and a line switching unit for switching the telephone line to either the telephone side or the signal transmitting / receiving unit side. And a line opening / closing means for opening / closing the telephone line switched to the signal transmitting / receiving means by the line switching means. In the terminal device, and the line current detection means for detecting the presence or absence of current supply to the telephone line from the exchange provided in the exchange side of the line switching means, abnormality is detected by said abnormality detecting means
In this case, the telephone line is switched by the line switching means.
Switch to the signal transmission / reception means side and use the line switching means.
The telephone line is closed by the line current detecting means.
Monitor the current supply from the switch to the telephone line.
If the current is not supplied,
The telephone line is opened for a certain period of time by the line opening and closing means.
After that, a control means for closing the telephone line again is provided.
Characterized in that it.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

[0012]

In the security terminal device of the present invention, when the telephone line is closed by the line opening / closing means to send a signal according to the abnormality detected by the abnormality detecting means to the monitoring center, the telephone is detected by the line current detecting means. When the current supply to the line is monitored and the current supply cannot be detected by the line current detection means, the telephone line is opened with the telephone line switched to the device side, and the exchange detects that the telephone line has been opened. The telephone line is opened until a predetermined time set in the control means elapses with reference to the time when the current supply is restarted, and then the telephone line is closed again. By performing the above control, the exchange is made to resume the current supply to the telephone line. After confirming that the current supply has been resumed, a signal corresponding to the abnormality detected by the sensor is sent to the monitoring center. In the security terminal device of the present invention, rather than the line switching means
Incoming call detection that detects ringing signals to the telephone line on the exchange side
It is desirable to further provide means. In this case,
When the output means detects an abnormality, the control means calls
Is not detected by the incoming call detection means and the current supply is
The telephone line is not detected by the line current detection means.
After confirming that is not used,
Therefore, switch the telephone line to the signal transmitting / receiving
The telephone line on the signal transmitting / receiving means side is closed by the line opening / closing means.
Switched to the telephone line by connecting and detecting the line current
To monitor the current supply from. This current supply
As a result of power supply monitoring, the current supply is detected by the line current detection means.
If it is confirmed that the
Is the selection signal transmitting means the selection signal for selecting the visual center?
From the switch to the exchange, and then the signal transmission / reception means detects an abnormality.
To send a signal according to the abnormality detected by the means.
It On the other hand, the line current detection means is not detecting the current supply.
If it is confirmed that there is no connection, the control means
After opening the telephone line for a certain time by means,
Current supply monitoring operation that closes the line and monitors the current supply
To detect the current supply during the current supply monitoring operation.
Then, send a selection signal from the selection signal sending means to monitor
After connecting the center and the telephone line, through the telephone line
Depending on the abnormality detected by the abnormality detection means from the signal transmission / reception means
To send the signal. Place to open the telephone line
For a certain period of time, the exchange calls the
It is set according to the interval to monitor the line on-hook.
It is good to ask.

Claims (1)

[Claims] 1. An abnormality detecting means that is connected to a monitoring center through an exchange by a telephone line shared with a telephone and detects an abnormality, and a telephone number of the monitoring center that is set in advance is used as a selection signal to connect the telephone line. Selection signal transmitting means for transmitting to the exchange through the exchange, and a signal according to the abnormality detected by the abnormality detecting means for transmitting to the monitoring center via the exchange using the telephone line, and from the monitoring center to the telephone. A signal transmitting / receiving unit for receiving a signal transmitted using a line, a line switching unit for switching the telephone line to either the telephone side or the signal transmitting / receiving unit side, and the signal transmitting / receiving unit side by the line switching unit. And a line opening / closing means for opening / closing the switched telephone line. A line current detecting means provided on the exchange side rather than the switch for detecting the presence or absence of current supply from the exchange to the telephone line, and a line current detecting means provided on the exchange side from the line switching means for connecting to the telephone line. An incoming call detecting means for detecting a ringing signal is connected to each of the abnormality detecting means, the selection signal sending means, the signal transmitting / receiving means, the line switching means, the line opening / closing means, the line current detecting means and the incoming call detecting means. The control means further comprises: when the abnormality detecting means detects an abnormality, the ringing signal is not detected by the incoming call detecting means and the current supply is detected by the line current detecting means. After confirming that the telephone line is not used because it is not
The line switching unit switches the telephone line to the signal transmitting / receiving unit side, the line switching unit closes the signal transmitting / receiving unit side, and the line current detecting unit switches the telephone line to the telephone line. Current supply is monitored, and if it is confirmed by the line current detection means that the current supply is detected, the selection signal for causing the exchange to select the monitoring center is sent from the selection signal transmission means to the exchange. After sending the signal to the signal transmitter / receiver, a signal corresponding to the abnormality detected by the abnormality detector is transmitted, and on the other hand, when it is confirmed that the current supply is not detected by the line current detector, A current for monitoring the current supply by opening the telephone line for a certain period of time by the line opening / closing means and then closing the telephone line When the current supply is detected in the current supply monitoring operation by performing the power supply monitoring operation, the selection signal is transmitted from the selection signal transmitting means to connect the monitoring center to the telephone line, and then via the telephone line. A security terminal device, wherein a signal according to an abnormality detected by the abnormality detecting means is transmitted from the signal transmitting / receiving means.