JPH0832712A - Supervisory terminal device - Google Patents

Abstract

PURPOSE:To securely receive data from a supervisory center by controlling a switching circuit when a data monitor means decides data reception, and forcibly disconnecting a telephone set from a telephone line and connecting a data transmission and reception part to the telephone line. CONSTITUTION:A detection part 9 detects a loop current generated by the on-hook operation of the telephone set 2, and also detects and sends data, etc., from telephone lines L1 and L2 to a control part 6. Therefore, even when a contact r2 is broken, the control part 6 can detect termination. When there is no answer although the bell of the telephone set 2 rings at the time of termination from the supervisory center, the detection part 9 detects the call signal and informs the control part of it, so the control part 6 controls a relay driving part 8 to disconnect the telephone set 2 from the lines L1 and L2 through a contact r1 and connect a data transmission and reception part 5 to the lines L1 and L2 through a contact r2, thereby performing reception by the transmission and reception part 5. Further, when there is no answer although the bell of the telephone set 2 rings at the time of the termination from the supervisory center, the telephone set 2 is disconnected from the lines L1 and L2 through the contact r1 as mentioned above and the data transmission and reception part 5 is connected to the lines L1 and L2 through the contact r2, enabling reception.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring terminal device such as an emergency notification device, an emergency notification device and a security terminal device which are connected to a telephone line together with a telephone. Monitoring terminal devices such as an emergency notification device, an emergency notification device, and a security terminal device that automatically or manually notify the monitoring center when an emergency occurs are usually connected to the monitoring center via a telephone line. Generally, the telephone line is commonly used with a telephone. Therefore, it is demanded that the control of the monitoring terminal device is not affected by the operation of the telephone.

[0002]

2. Description of the Related Art FIG. 6 is an explanatory diagram of a monitoring system. A monitoring terminal device 31 to which various sensors are connected is arranged at a monitored location such as in a general home, an office, or a warehouse. The device main body 38 of 31 is switched and connected to the telephone 32 by the switching circuit 33 with respect to the telephone line 34.

The switching circuit 33 is controlled by the device body 38 of the monitoring terminal device 31 or manually, and is normally switched to the illustrated state. Therefore, for example, when a call is made from the telephone set 32 to the telephone set 37, the telephone set 37 is called from the exchange 35, and when the telephone set 37 responds off-hook, the route indicated by the alternate long and short dash line is formed in the exchange set 35. Calls can be made between 37.

Further, the monitoring terminal device 31 is connected to various sensors (not shown) such as a fire detector and an illegal intrusion detector, or an emergency button such as a pendant button, and when a signal from them is input, the monitoring terminal is connected. Device body 38 of device 31
Controls the switching circuit 33 to switch connection to the telephone line 34. Then, the monitoring center 36 is automatically called and the exchange 35
Calls the monitoring center 36, and when the monitoring center 36 responds, a path indicated by a dotted line is formed in the exchange 35,
Monitoring data is sent from the monitoring terminal device 31 to the monitoring center 36.

Further, the monitoring terminal device 31 has a function of automatically responding to a calling signal by a predetermined number of times when the telephone 32 does not respond to the calling signal, and controls the switching circuit 33 at the time of this automatic response. The telephone line 34 and the monitoring terminal device 31 are switched and connected so that data can be received from the monitoring center 36.

[0006] For example, in the case of a security terminal device, when the unmanned state is switched to the monitoring state, if the monitoring center 36 identifies that the switching operation has not been performed even after the time period for switching to this monitoring state has passed. , The monitoring center 36 makes a call to the monitoring terminal device 31 when the switching operation to the monitoring state is forgotten, and the control data is sent from the monitoring center 36 by the automatic response of the monitoring terminal device 31.
Reference numeral 1 switches to the monitoring state according to the control data. Further, it is possible to send data for setting other monitoring conditions from the monitoring center 36 to the monitoring terminal device 31.

[0007]

The switching circuit 33 is constantly switched to the state shown in the figure so that the telephone 32 can be used preferentially, and when it is necessary to notify the monitoring center 36, the monitoring terminal 36 can be used. The device 31 controls the switching circuit 33 to switch and connect the telephone line 34 to the monitoring terminal device 31. Further, when a call is received from the monitoring center 36, the telephone 32 and the monitoring terminal device 31 simultaneously detect a calling signal. However, since the telephone 32 has priority, a general calling signal (for example, 16Hz on 1 second, off 2
The monitoring terminal device 31 is set to automatically respond after a predetermined number of intermittent cycles (intermittent seconds).

Therefore, if the telephone is not unattended, the telephone 32 is likely to respond to an incoming call from the monitoring center 36 first. When the telephone 32 responds off-hook, the monitoring center 36 monitors. Since it is not possible to automatically discriminate between the response from the terminal device 31 and the response from the telephone 32, data transmission is started by a modem signal. Since the telephone 32 that has gone off-hook can only hear a signal sound, not a voice, it immediately goes on-hook. As a result, the monitoring center 36 has a problem that the call is frequently reissued.

In the case where the telephone 32 is provided with an answering machine function and is used as an answering machine, the answering machine is always prior to the monitoring terminal device 31 in response to an incoming call from the monitoring center 36 even if the telephone is unattended. It will respond automatically. Therefore,
There is also a problem that it becomes impossible to send data from the monitoring center 36 to the monitoring terminal device 31. An object of the present invention is to make it possible to receive data from a monitoring center by adding a simple structure.

[0010]

SUMMARY OF THE INVENTION A monitoring terminal device of the present invention includes a data transmitting / receiving unit for switching and connecting a telephone line to a telephone by a switching circuit and transmitting / receiving data to / from a monitoring center. In this case, the data monitor means for monitoring the data from the monitoring center added to the telephone that responded to the incoming call, and when the data monitor means determines that the data has been received, the switching circuit is controlled to transmit and receive the data from the telephone line to the telephone. The unit is provided with a switching control means for forcibly switching and connecting.

Further, the data monitor means includes a loop current detector for detecting a loop current and an AC component flowing in the telephone,
It can be configured with a control unit that demodulates the AC component detected by the loop current detection unit and detects data.

[0012]

When the call is sent from the monitoring center to the monitoring terminal device and the data is sent, the data is sent from the monitoring center as described above even if the telephone responds first, and the data is sent off-hook. Added to the responding telephone and data monitor means. The data monitor means
When it is determined by the first few characters of the received data that the data is received from the monitoring center, the switching control means controls the switching circuit according to the determination to forcibly switch and connect the telephone line from the telephone to the data transceiver. Therefore,
The data transmitting / receiving unit can be compulsorily switched and connected to the telephone line so that the data from the monitoring center can be received even if the telephone answers the incoming call from the monitoring center first.

The loop current detector of the data monitor means detects an alternating current component such as a loop current and a modulation signal flowing in the telephone by off-hook and demodulates it in the controller to identify the data from the monitoring center. It is possible to determine whether or not data is received in a short time of 1 s or less and several hundred ms.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram of an embodiment of the present invention, in which 1 is a monitoring terminal device, 2 is a telephone, 3 is a switching circuit, 4 is a control processing unit, 5 is a data transmitting / receiving unit, 6 is a control unit, 7 is an automatic caller, 8 is a relay driver, 9 is a loop current detector, L1,
L2 is a telephone line, R1 and R2 are relays, and r1 and r2 are relay contacts.

Although the switching circuit 3 is shown to be constituted by the contact r1 of the relay R1, the switching circuit 3 may be a switching circuit including the contact r2 of the relay R2. Further, since the contact point r1 is always in the make state and the contact point r2 is in the break state, the telephone set 2 is connected to the telephone lines L1 and L2, and the data transmitting / receiving unit 5 is disconnected from the telephone lines L1 and L2. Therefore, the telephone set 2 is in a state where it can freely talk with another telephone set by making or receiving a call.

As in the conventional example, the monitoring terminal device 1 is connected to various sensors (not shown) such as a fire detector and an illegal intrusion detector, or an emergency button such as a pendant button (not shown). Is connected), and the control processing unit 4 includes a data transmitting / receiving unit 5, a control unit 6, an automatic calling unit 7, a relay driving unit 8 and the like, and each unit is, for example, a microprocessor or the like. It can also be realized by the processing function of. Further, a loop current detector 9 which constitutes a part of the data monitor means is provided.

The loop current detecting section 9 detects a loop current due to an off-hook of the telephone set 2, and a call signal received via the telephone lines L1 and L2 and data by a modulation signal from a monitoring center (not shown). Is detected and notified to the control unit 6, and the data monitoring means is constituted together with the demodulation function and the data identification function in the control unit 6. Therefore, even if the contact point r2 is in the break state, the control section 6 can detect the incoming call.

If no response occurs even if the bell of the telephone 2 rings by the ringing signal when the call is received from the monitoring center, the loop current detecting section 9 also detects the ringing signal and the control section 6 as described above. Therefore, the control unit 6 controls the relay driving unit 8 after a predetermined intermittent period of the calling signal,
Operate the relays R1 and R2. Thereby, the contact point r
The telephone 2 is disconnected from the telephone lines L1 and L2 by 1 and the data transmitting / receiving unit 5 is connected to the telephone lines L1 and L2 by the contact point r2. Therefore, the data from the monitoring center can be received by the data transmitting / receiving unit 5.

When the telephone call is received from the monitoring center, if the telephone 2 responds by off-hook, the monitoring center starts transmitting data. This data is applied to the telephone 2 via the loop current detector 9. Therefore, the loop current detection unit 9 detects the data of the modulation signal and notifies the control unit 6, and when the control unit 6 determines that the data is received from the monitoring center, it controls the relay drive unit 8 to relay the relays R1, R2. To operate. As a result, the telephone set 2 is forcibly disconnected from the telephone lines L1 and L2 by the contact point r1, and the data transmitting / receiving unit 5 is connected to the telephone line lines L1 and L2 by the contact point r2. That is, the data from the monitoring center can be received by the data transmitting / receiving unit 5 even if the telephone 2 responds first. The data transmission / reception unit 5 includes a function of a known modem, has a unit for identifying received data by means of sampling or the like and transferring it to the control unit 6, and modulates data from the control unit 6. Then, it has a means for transmitting.

FIG. 2 is an explanatory diagram of a data format, (a) is selecting SEL, (b) is DLE,
ACK, (c) DLE, NAK, (d) data,
(E) shows EOT, EOT, (f) shows DLE, EOT. An example of each code is shown in hexadecimal notation. As the station designation code SA, the monitoring center SA = (3
7) _H and the unit address UA, the monitoring terminal device 1 can set UA = (30) _H.

The ID is an arbitrary 5-byte identification data, ENQ, which is agreed in advance between the monitoring center and the monitoring terminal device.
Is an inquiry code, DLE is an extension code, ACK is a positive response, NAK is a negative response, STX is a text start code, ETX is a text end code, BCC is a block check code, and EOT is a transmission end code. In addition,
DLE = (10) _H , ACK = (06) _H , NAK =
(15) _H , STX = (02) _H , ETX = (0
3) _H and EOT = (04) _H. The data can be, for example, a maximum of 507 bytes. As the block check code BCC, a value obtained by exclusive OR of the data SA to ETX can be used.

FIG. 3 is a sequence diagram for explaining a normal incoming call. It is shown between the monitoring center and the monitoring terminal device, and the operation of the exchange is omitted. When a call is sent from the monitoring center to the monitoring terminal device, the exchange sends a ringing tone to the monitoring terminal device, the loop current detection unit 9 (see FIG. 1) of the monitoring terminal device detects it, and the control unit 6 activates the relay drive unit 8. When the relays R1 and R2 are controlled to operate and the telephone lines L1 and L2 are switched and connected to the data transmitting / receiving unit 5 to respond, the exchange notifies the monitoring center of the called party response by polarity reversal. The monitoring center detects the polarity reversal and sends the selecting SEL in the format shown in FIG.

The monitoring terminal device identifies the station identification code SA, the unit address UA, the identification code ID, and the inquiry code ENQ, and if the data is a reception instruction data from the monitoring center, the format shown in FIG. A positive response DLE, ACK is sent. When the monitoring center receives the positive response DLE, ACK from the monitoring terminal device, it sends out the data DATA in the format shown in FIG. The monitoring terminal device receives this data and processes it in the control unit 6 (see FIG. 1).

When this data is normally received, DLE and NAK in the format shown in FIG.
Is sent. In this case, DLE, ACK as a positive response
It is also possible to use only DL, but in order to prevent missing blocks, etc., DL is alternated every time data is normally received.
E, ACK and DLE, NAK can be transmitted. In the monitoring center, the DLE,
When the alternating nature of ACK and DLE, NAK is maintained, it is determined that all are positive responses.

When the transmission of data from the monitoring center is completed, EOT and EOT in the format shown in FIG.
Is sent, the timer is started, and if the data from the monitoring terminal device is not received even after the set time has elapsed, DLE and EOT in the format shown in (f) of FIG. 2 are sent. As a result, the monitoring terminal device disconnects the line.

FIG. 4 is an explanatory view of the sequence when the telephone responds, and the monitoring center, the monitoring terminal device, and the telephone call from the monitoring center as in the case of FIG.
When a ringing tone is sent from the exchange and the telephone responds off-hook, the monitoring center determines the called party's response by reversing the polarity and sends the selecting SEL.

The data transmission / reception unit 5 (see FIG. 1) of the monitoring terminal device cannot receive this selecting SEL because it is not connected to the telephone lines L1 and L2.
Since it is applied to the telephone set 2 through the loop current detection unit 9, the loop current detection unit 9 causes the selecting SE
L is detected and notified to the control unit 6.

Therefore, the telephone set 2 has a contact point r1 (break).
Is forcibly disconnected from the telephone lines L1 and L2, and the data transmission / reception section 5 causes the data transmission / reception unit 5 to be turned on by the telephone line L.
1 and L2. Further, the monitoring terminal device does not respond when the selecting SEL from the monitoring center cannot be received normally, and when the monitoring center does not respond to the selecting SEL, the monitoring terminal device selects again after a predetermined time. SEL. When the monitoring terminal device normally receives and identifies this selecting SEL, it sends an affirmative response DLE, ACK.

When the monitoring terminal device can normally receive the selecting SEL retransmitted from the monitoring center, as described above, since the positive acknowledgments DLE and ACK are sent, the monitoring center sends the data DATA. This data DAT
When A is normally received, the monitoring terminal device DLE, NA
Send K to acknowledge. When the monitoring center finishes sending the data, it sends EOT, EOT and DLE, EOT due to timeout, so the monitoring terminal device disconnects the line. Therefore, when an incoming call is received from the monitoring center, the monitoring terminal device can receive the data even if the telephone answers first.

FIG. 5 is a sequence diagram for explaining an incoming call from a general telephone. When a call is made from the ordinary telephone and the telephone cannot answer in the unattended state, when the monitoring terminal device responds by detecting a ring tone, SEL detection is performed. In the middle, the reception of the selecting SEL from the monitoring center is awaited. Since the ordinary telephone does not send the selecting SEL, the line is disconnected by sending DLE and EOT due to timeout.

When the telephone responds to the call from the ordinary telephone, a call path is established with the ordinary telephone, and the telephone is brought into a call state. Then, the monitoring terminal device is SE
L detection is in progress, and SEL detection ends due to timeout. In this case, since the data transmitting / receiving unit 5 (see FIG. 1) of the monitoring terminal device is not connected to the telephone lines L1 and L2, DLE and EOT are not transmitted. Therefore, it is possible to make a call without any trouble between the telephone that shares the telephone line with the monitoring terminal device and the ordinary telephone.

The present invention is not limited to the above-described embodiment, but various additions and modifications can be made. For example, the switching circuit 3 is not composed of the contacts of the relay, but is a switching device such as a transistor. It is also possible to configure by using elements, and as the switching configuration, it is also possible to configure by a transfer contact like the conventional switching circuit shown in FIG.

[0033]

As described above, according to the present invention, the data monitoring means including the loop current detecting section 9 and the control section 6 for monitoring the data from the monitoring center applied to the telephone 2 which has answered the incoming call, and the data monitoring means. When the data monitoring means determines that the data is received, the switching circuit 3 is controlled to forcibly disconnect the telephone 2 from the telephone lines L1 and L2, and the data transmission / reception unit 5 is connected to the telephone lines L1 and L2. By providing a switching control means including the relay drive section 8, the relays R1, R2, etc., even if the telephone 2 responds to an incoming call from the monitoring center first, the data from the monitoring center is monitored by the data monitoring means. , And when it is judged that the data is received,
The switching control means can forcibly switch and connect the telephone lines L1 and L2 from the telephone 2 to the data transmitting / receiving unit 5 to receive data. Therefore, in the monitoring center, there is an advantage that the re-calling process is not necessary and the data can be sent from the monitoring center to the monitoring terminal device 1 even when the telephone 2 is used as an answering machine. The present invention can be applied to various systems that control 1

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a data format.

FIG. 3 is an explanatory diagram of a sequence when a normal call is received.

FIG. 4 is an explanatory diagram of a sequence when a telephone response is made.

FIG. 5 is an explanatory diagram of a sequence when a call is received from a general telephone.

FIG. 6 is an explanatory diagram of a monitoring system.

[Explanation of symbols]

 1 Monitoring Terminal Device 2 Telephone 3 Switching Circuit 4 Control Processor 5 Data Transmitter / Receiver 6 Controller 7 Automatic Caller 8 Relay Driver 9 Loop Current Detector R1, R2 Relay r1, r2 Contact L1, L2 Telephone Line

Claims (2)

[Claims] 1. A monitoring terminal device including a data transmitting / receiving unit for switching connection of a telephone line to a telephone line by a switching circuit and transmitting / receiving data to / from a monitoring center, in addition to the telephone that responds to an incoming call. Data monitoring means for monitoring data from the monitoring center, and when the data monitoring means determines that data has been received, the switching circuit is controlled to forcibly switch the telephone line from the telephone to the data transmitting / receiving section. A monitoring terminal device, comprising: a switching control unit for connection. 2. The data monitor means includes a loop current detection unit that detects a loop current and an AC component flowing in the telephone, and a control unit that demodulates the AC component detected by the loop current detection unit and detects data. The monitoring terminal device according to claim 1, wherein the monitoring terminal device is configured by: