JP2023145744A - Fire alarm facility - Google Patents

Abstract

An object of the present invention is to realize a highly convenient telephone call function that allows both call control with a telephone handset using a transmission function and calls by connecting the telephone handset to a telephone jack. [Solution] In the fire alarm equipment, a telephone repeater 18 is connected to transmission lines 12a, 12b drawn out from a receiver 10 and telephone lines 16a, 16b to which a telephone jack 38 is connected, and the receiver 10 is connected to a telephone repeater 18. It is possible to make a call connection with the emergency telephone handset 40 through the telephone handset 20 and the telephone jack 38 via the telephone handset 18, and the telephone call connection with the telephone handset 20 is made via a predetermined transmission line 12a, 12b. It is controlled by sending and receiving call control signals, and the call connection with the emergency telephone handset 40 is controlled by the connection state of the emergency telephone handset 40 to the telephone jack 38. When the connection of the emergency telephone handset 40 to the telephone jack 38 is detected, the communication connection is switched to the emergency telephone handset 40. [Selection diagram] Figure 1

Description

The present invention relates to fire alarm equipment that connects a telephone base unit and a telephone handset using a transmission line and a telephone line to which a fire detector from a receiver is connected.

Conventionally, in fire alarm equipment known as type R, a terminal device such as a fire detector equipped with a transmission function is connected to a transmission line drawn out from a receiver, and when a fire is detected, the fire alarm Based on the fire interrupt from the system, a search command is issued to identify the address of the fire detector that triggered the alarm, display the address where the fire occurred, and collect and monitor fire data from the identified fire detector. There is.

In this way, knowing the address of the fire detector that detected the fire makes it possible to carry out appropriate evacuation guidance and fire extinguishing activities, making it an essential function especially for fire monitoring in large-scale facilities.

In addition, in fire alarm equipment, as an emergency call device, a telephone main unit is installed in the receiver, and a telephone jack installed in a transmitter or the like is connected to a telephone line drawn out from the receiver to the restricted area. In the event of a fire or inspection, when a person in charge connects the maintenance phone handset carried by the person in charge to the telephone jack of a transmitter, a call is made on the receiver, and the maintenance call is made by going off-hook with the telephone main unit. A call connection can be established with the handset.

Additionally, emergency telephone equipment may be installed as equipment related to fire alarm equipment. For emergency telephone equipment, an emergency telephone board with a telephone main unit is installed in the same place as the receiver, and a telephone line and control line are drawn out from the emergency telephone board to the restricted area and an emergency telephone handset is connected.

For maintenance telephone equipment of fire alarm equipment, it is not possible to specify and call the maintenance telephone handset from the telephone main unit, but for emergency telephone equipment, the emergency telephone handset can be arbitrarily designated by calling the telephone number from the emergency telephone board. It can be used not only in emergencies such as fires, but also for day-to-day maintenance and management of equipment.

Japanese Patent Application Publication No. 2004-064709 Japanese Patent Application Publication No. 2017-004451 JP2016-076064A Japanese Patent Application Publication No. 2017-068523 Japanese Patent Application Publication No. 10-69591

However, conventional emergency telephone equipment that can specify and call such a telephone handset has the problem of increasing equipment costs because it must be installed as equipment related to fire alarm equipment. Maintenance phone equipment for fire alarm equipment that connects a maintenance telephone handset to a jack and connects it to the telephone base unit requires less equipment cost, but does not allow advanced call control such as calling by specifying a telephone handset. , there is a problem that it is less convenient than emergency telephone equipment.

The present invention utilizes the transmission function used in R-type fire alarm equipment to provide advanced call control including calling a designated telephone handset, as well as making it possible to make calls by connecting the telephone handset to a telephone jack. The purpose of the present invention is to provide fire alarm equipment with a highly convenient telephone call function.

(Fire alarm equipment)
In the present invention, a terminal device including a telephone repeater is connected to a transmission line drawn out from a receiver to a guarded area, and a telephone relay is connected to a telephone line also drawn out from the receiver to a guarded area and connected to a telephone jack. In fire alarm equipment connected to
The receiver is
A call connection is possible with a first telephone handset connected to a telephone line via a telephone repeater and a second telephone handset connected to a telephone line through a telephone jack,
The call connection with the first telephone handset is controlled by sending and receiving a predetermined call control signal via the transmission line,
The call connection with the second telephone handset is controlled by the connection state of the second telephone handset to the telephone jack,
If connection of the second telephone handset to the telephone jack is detected during a call connection with the first telephone handset, the communication connection is switched to the second telephone handset.

(Hold tone of 1st telephone handset)
When the receiver detects the connection of the second telephone handset to the telephone jack during the call connection with the first telephone handset and switches to the call connection with the second telephone handset, A hold command signal is transmitted to the telephone relay section connected to the first telephone slave unit via the transmission line to cause the first telephone slave unit that was connected to the call to output a hold tone.

(Fire alarm equipment equipped with first telephone equipment and second telephone equipment)
In another form of the present invention, a transmission line is drawn out from the receiver to the guarded area and connected to terminal equipment including a telephone repeater;
a first telephone line led out from the receiver to the restricted area and connected to a telephone repeater;
a second telephone line led from the receiver to the restricted area and connected to a telephone jack;
In fire alarm equipment equipped with
The receiver is
A call connection is possible with a first telephone handset connected to the first telephone line via the telephone repeater and a second telephone handset connected to the second telephone line via the telephone jack,
The call connection with the first telephone handset is controlled by sending and receiving a predetermined call control signal via the transmission line,
The communication connection with the second telephone handset is controlled by the connection state of the second telephone handset to the telephone jack.

(Effects of fire alarm equipment)
In the present invention, a terminal device including a telephone repeater is connected to a transmission line drawn out from a receiver to a guarded area, and a telephone relay is connected to a telephone line also drawn out from the receiver to a guarded area and connected to a telephone jack. In the fire alarm equipment to which the receiver is connected, the receiver includes a first telephone handset connected to the telephone line via a telephone repeater and a second telephone handset connected to the telephone line via a telephone jack. The call connection with the first telephone handset is controlled by sending and receiving a predetermined call control signal via the transmission line, and the call connection with the second telephone handset is controlled by the second telephone handset. Control is based on the connection status of the handset to the phone jack, and if connection of the second phone handset to the phone jack is detected during a call connection with the first phone handset, the call with the second phone handset is controlled. By using the transmission function of the transmission line used in the R-type fire alarm equipment for call control, advanced call control including calling by specifying the first telephone handset is easy and simple. It can be realized at low cost.

In addition to advanced call control, including calling by specifying the first telephone handset using the transmission line, it is also possible to make calls by connecting the second telephone handset to the telephone jack without sacrificing its functionality. This makes it possible, and provides greater convenience.

In addition, if a second telephone handset is connected to the telephone jack during a call between the telephone base unit and the first telephone handset, the previous call connection between the telephone base unit and the first telephone handset is suspended and the second telephone handset is connected to the telephone jack. You can give priority to calls with telephone handsets.

(Effects of fire alarm equipment equipped with emergency telephone equipment and maintenance telephone equipment)
In another form of the invention, a transmission line is drawn out from the receiver to the guarded area and connected to terminal equipment including a telephone repeater, and a transmission line led out from the receiver to the guarded area and connected to the telephone repeater. In a fire alarm system equipped with a first telephone line connected to a telephone jack, and a second telephone line led out from the receiver to a restricted area and connected to a telephone jack, the receiver is connected to the second telephone line via a telephone repeater. A call connection is possible between a first telephone handset connected to one telephone line and a second telephone handset connected to a second telephone line via a telephone jack, and a call connection with the first telephone handset is possible. , is controlled by sending and receiving a predetermined call control signal via the transmission line, and the call connection with the second telephone handset is controlled by the connection state of the second telephone handset to the telephone jack. For the first telephone equipment that uses a telephone line, advanced call control that displays the caller can be achieved easily and at low cost, and for the second telephone equipment that uses a second telephone line, a telephone jack A telephone call can be made by connecting the second telephone handset to the telephone terminal, making it possible to use both the first telephone equipment and the second telephone equipment, and further providing high convenience.

In addition, since the functions of the base unit in the first telephone equipment and the second telephone equipment are integrated into the receiver, the installation space for the fire alarm equipment and telephone equipment is reduced. Calls with two telephone handsets can be made in common by using the same telephone main set, and call operations can be performed simply and easily without changing the location.

Explanatory diagram showing an embodiment of fire alarm equipment with a call control function A block diagram illustrating an embodiment of the telephone repeater of FIG. A block diagram showing an embodiment of the telephone main unit circuit section and the call detection circuit section provided in the receiver of FIG. Time chart showing call control in which a telephone base unit specifies and calls a telephone slave unit. Time chart showing call control with the telephone base unit by off-hook of the telephone handset Time chart showing call control when a telephone handset goes off-hook while the telephone base unit is talking with another telephone handset Time chart showing call control when switching between a telephone base unit and a telephone slave unit when receiving a call from another telephone slave unit during a call Time chart showing call control of a three-party call between a telephone base unit and two telephone handsets Time chart showing call control performed by connecting a maintenance telephone handset to a telephone jack Explanatory diagram showing an embodiment of fire alarm equipment equipped with a call control function for emergency telephone equipment linked to emergency broadcast equipment and maintenance telephone equipment used for maintenance inspections

[Fire alarm equipment]
(Overview of fire alarm equipment with call control function)
FIG. 1 is an explanatory diagram showing an outline of a fire alarm system equipped with a call control function. As shown in FIG. 1, an R-type receiver 10, for example, is installed in a manager's room on the first floor of a building where fire alarm equipment is installed. Telephone lines 16a and 16b are drawn out.

A plurality of fire detectors 14 and repeaters 15 each having a transmission function and each having a unique address are connected to the transmission lines 12a and 12b. Further, a plurality of telephone repeaters 18 each having a telephone cordless handset 20 are connected to the transmission lines 12a, 12b and telephone lines 16a, 16b, and each telephone repeater 18 is set with a unique address and has a transmission function. Has call control function. Further, the receiver 10 is provided with a telephone main unit 28 corresponding to the telephone slave unit 20. Note that the telephone lines 16a and 16b ensure transmission quality of audio signals in the audio frequency band 300 to 3400H.

Here, the maximum number of addresses set for the fire detector 14, repeater 15, and telephone repeater 18 connected to the transmission lines 12a, 12b is, for example, 255, and a maximum of 255 fire alarms can be connected to the transmission lines 12a, 12b. Terminal equipment including a sensor 14, a repeater 15, and a telephone repeater 18 can be connected.

A transmitter 36 is connected to the repeater 15. The transmitter 36 is provided with a transmitter button 36a, and when the transmitter button 36a is pressed and turned on in the event of a fire, a transmission signal is output to the repeater 15, and transmitted from the repeater 15 to the receiver 10 via the transmission lines 12a and 12b. A fire notification signal is sent to the station, and a fire alarm is output.

Further, the transmitter 36 is provided with a telephone jack 38, and the telephone jack 38 is connected to the telephone lines 16a and 16b. When the person in charge inserts the plug 42 of the maintenance telephone handset 40 carried by the person in charge into the telephone jack 38, the maintenance telephone handset 40 is connected to the telephone lines 16a, 16b, and the telephone main unit 28 provided on the receiver 10 is connected to the telephone line 16a, 16b. A call connection is established and you can make a call.

(Functional configuration of receiver)
The receiver 10 includes a reception control section 22, a transmission section 24, a telephone base unit circuit section 26, a telephone base unit 28, a display 30 with a touch panel, a display section 31, an operation section 32, an alarm section 33 equipped with a speaker, and a transmission section. 34 and a call detection circuit section 35.

The reception control unit 22 is a computer circuit or the like including a CPU, memory, various input/output ports, and the like. The transmission unit 24 transmits and receives signals to and from the fire detector 14, repeater 15, or telephone repeater 18 connected to the transmission lines 12a and 12b according to a predetermined communication protocol.

Downlink signals from the transmission section 24 to the fire detector 14, repeater 15, or telephone repeater 18 are transmitted in voltage mode. This voltage mode signal is transmitted as a voltage pulse that changes the line voltage of the transmission lines 12a, 12b between, for example, 18 volts and 30 volts.

On the other hand, upstream signals from the fire detector 14, repeater 15, or telephone repeater 18 to the receiver 10 are transmitted in current mode. In this current mode, a signal current is passed through the transmission lines 12a and 12b at the timing of bit 1 of the transmission data, and an upstream signal is transmitted to the receiver as a so-called current pulse train.

(Fire monitoring control section)
The reception control section 22 of the receiver 10 is provided with the function of a fire monitoring control section 44 as a function realized by executing a program by the CPU.

During normal monitoring, the fire monitoring control unit 44 instructs the transmission unit 24 to transmit a broadcast batch AD conversion signal including a batch AD conversion command at regular intervals. The fire detector 14 that has received the converted signal detects and holds the smoke concentration or temperature as sensor data, and the repeater 15 detects and holds the transmitter signal at that time. Subsequently, the fire monitoring control unit 44 transmits a calling signal including a polling command that sequentially specifies terminal addresses.

When the fire detector 14 receives a call signal having an address that matches its own address, it transmits a response signal containing the sensor data held at that time to the receiver 10. Furthermore, when the fire detector 14 detects a fire, it transmits a fire interrupt signal to the receiver 10.

When the repeater 15 also receives a calling signal having an address that matches its own address, it transmits a response signal containing the transmitter signal held at that time to the receiver 10. Further, when the repeater 15 receives a transmitter signal turned on by pressing the transmitter button 36a of the transmitter 36, it transmits a fire interrupt signal to the receiver 10 as a fire report signal, similarly to the fire detector 14.

When the fire monitoring control unit 44 receives the fire interrupt signal via the transmission unit 24, it transmits a group search command signal to identify the group including the fire detector 14 and repeater 15 that are detecting a fire, and then, A group search command signal is sent to identify the address of the fire detector 14 or repeater 15 that is detecting a fire, output a fire alarm and display the fire occurrence address or transmitter address, and then identify Control is performed to collect and monitor fire data from the fire detector 14 or repeater 15.

(Telephone main unit control unit)
The reception control section 22 of the receiver 10 is provided with the function of a telephone main unit control section 46 as a function realized by the execution of a program by the CPU.

The telephone main unit control unit 46 instructs the transmission unit 24 to send and receive command signals necessary for various call control to and from the telephone repeater 18 via the transmission lines 12a and 12b, and to control the telephone lines 16a and 16b. Control is performed to connect and cut calls between the telephone base unit 28 and the telephone handset 20 via the telephone main unit 28 and the telephone slave unit 20.

The call control by the telephone main unit control unit 46 of this embodiment includes the following.
(1) Call control by calling a designated telephone handset.
(2) Call control by calling from a telephone handset.
(3) Call switching control by calling from another telephone handset during a call with a telephone handset.
(4) Three-party call control between the base phone and two handsets.
(5) Call control by connecting a maintenance telephone handset to a telephone jack.

Among these, in call control (1) to (4), a calling command signal, an incoming call response command signal, a holding command signal, a calling command signal, etc. are used as command signals. The call command signal is a signal requesting the telephone handset to make a call. The incoming call response command signal is a signal that is transmitted when the telephone handset is off-hook upon receiving the outgoing call command signal. The hold command signal is a signal that instructs the telephone handset to output a hold tone. The busy command signal is a signal that instructs the telephone handset to output a busy tone. Details of communication control using such command signals will be explained later.

(Call detection circuit)
The call detection circuit section 35 provided in the receiver 10 detects the problem that line current flows when the plug 42 of the maintenance telephone handset 40 is inserted into the telephone jack 38 of the transmitter 36 and connected to the telephone lines 16a, 16b. This line current is detected and a call detection signal is output to the reception control section 22.

When the telephone main unit control unit 46 provided in the reception control unit 22 receives the call detection signal from the call detection circuit unit 35, it outputs a ring tone based on the call connection of the maintenance telephone handset 40 from the speaker of the alarm unit 33. When the person in charge hears this and picks up the telephone base unit 28, based on the off-hook detection of the telephone base unit 28, the telephone base unit 28 is connected to the telephone lines 16a and 16b by the telephone base unit circuit 26, and a maintenance call is made. Control is performed to establish a call connection with the handset 40.

[Telephone repeater configuration]
FIG. 2 is a block diagram illustrating an embodiment of the telephone repeater of FIG. As shown in FIG. 2, the circuit section of the telephone repeater 18 includes a telephone handset control section 48 and a transmission section 50 as a circuit section on the transmission line 12a, 12b side, and a circuit section on the telephone line 16a, 16b side. , a connection switching section 52, a control sound generation section 54, a pair of switch circuit sections 56, a transformer 58, a hook switch 60, and a speaker 61 are provided, and the telephone handset 20 is provided with a receiver 45 and a transmitter 47. .

The telephone handset control section 48 is composed of a computer circuit including a CPU, memory, various input/output ports, etc., and the functions of the telephone handset control section 48 are realized by execution of a program by the CPU.

The call control by the telephone handset control unit 48 of this embodiment includes the following.
(1) Call control by calling the telephone base unit.
(2) Call control by calling from the telephone base unit.
(3) Call switching control by calling the telephone base unit during a call with another telephone slave unit.
(4) Three-party call control between the base phone and two handsets.

These call controls use command signals such as a calling command signal, an incoming call response command signal, a hold command signal, and a busy command signal, and the details of the call control will be explained later.

The transmission unit 50 transmits and receives various command signals necessary for call control to and from the transmission unit 24 of the receiver 10 shown in FIG. 1 via the transmission lines 12a and 12b according to the same communication protocol as in the case of fire monitoring. . Further, the transmission unit 50 receives the downstream signal from the receiver 10 in voltage mode, and transmits the upstream signal to the receiver 10 in current mode.

The connection switching section 52 operates according to instructions from the telephone handset control section 48 to turn on and off a switch circuit section 56 using relay contacts, semiconductor switch elements, etc., and connects the telephone handset 20 to the telephone lines 16a, 16b. and perform a cut (separation).

The control sound generation unit 54 operates according to instructions from the telephone handset control unit 48 and generates audio signals such as a predetermined line connection sound, a ring tone for the telephone base unit, a hold tone, and a busy tone to send to the telephone handset 20. It also generates a ring tone audio signal and outputs it to the speaker 61 in response to a call from the telephone base unit.

The transformer 58 has a primary winding connected to the telephone lines 16a, 16b, and a secondary winding connected to the telephone receiver 45, and receives only an AC voice signal from the telephone lines 16a, 16b on which a predetermined DC voltage is superimposed. When the signal is picked up by the telephone receiver 45, it is amplified and furthermore, howling is prevented. The transmitter 47 of the telephone handset 20 is connected to the telephone lines 16a and 16b.

The hook switch 60 detects off-hook or on-hook of the telephone handset 20 and outputs an off-hook detection signal or an on-hook detection signal to the telephone handset controller 48 .

Note that the telephone circuits on the telephone lines 16a and 16b in FIG. 2 are basic analog telephone circuits, and are not limited to this; an audio amplifier may be provided as necessary, and digital audio signals may also be provided. It may also be a digital telephone circuit that receives, DA-converts, and outputs to the handset 45, and AD-converts the audio signal from the transmitter 47 and transmits the same.

[Configuration of the telephone main unit circuit section and call detection circuit section of the receiver]
FIG. 3 is a block diagram showing an embodiment of a telephone main unit circuit section and a call detection circuit section provided in the receiver of FIG.

(Telephone main unit circuit)
As shown in FIG. 3, the telephone main unit circuit section 26 is provided with a connection switching section 62, a control sound generating section 64, a pair of switch circuit sections 66, a transformer 68, and a hook switch 70. 72 and a transmitter 74 are provided. A telephone line voltage Vt of, for example, DC48V is applied from the telephone main unit circuit section 26 between the telephone lines 16a and 16b.

The connection switching unit 62 operates according to instructions from the telephone base unit control unit 46 in FIG. 1, turns on and off the switch circuit unit 66, and connects and cuts (disconnects) the telephone base unit 28 to and from the telephone lines 16a and 16b. .

The control sound generation unit 64 operates according to instructions from the telephone main unit control unit 46, and generates audio signals such as a predetermined line connection sound, a ring tone indicating a call to the telephone handset 20, a hold tone, and a busy tone. It outputs to the handset 72 of the telephone base unit 28, and also generates a ring tone audio signal in response to a call from the telephone slave unit 20 or the maintenance telephone slave unit 40, and outputs it to, for example, a speaker provided in the alarm unit 33.

The transformer 68 has a primary winding connected to the telephone lines 16a, 16b, and a secondary winding connected to the receiver 72, and receives an AC voice signal from the telephone lines 16a, 16b on which a predetermined telephone line voltage Vt is superimposed. When the signal is picked up by the telephone receiver 72, it is amplified and furthermore, howling is prevented. A transmitter 74 of the telephone base unit 28 is connected to the telephone lines 16a and 16b.

Hook switch 70 detects off-hook or on-hook of telephone base unit 28 and outputs an off-hook detection signal or an on-hook detection signal to telephone base unit control unit 46 .

Note that the telephone circuits on the telephone lines 16a and 16b in FIG. 3 are basic analog telephone circuits, similar to the telephone repeater 18 in FIG. It is also possible to provide a digital telephone circuit.

(Call detection circuit)
As shown in FIG. 3, the call detection circuit section 35 has resistors 76, 78, and 80 connected in series between the telephone line 16a to which a predetermined line voltage Vt is applied and the telephone line 16b on the negative side. A telephone line 16a is led out from between the resistors 76 and 78 to the terminal side, and a call detection signal is extracted from between the resistors 78 and 80 and output to the reception control section 22.

As shown in FIG. 1, when the plug 42 of the maintenance telephone handset 40 is inserted into the telephone jack 38 of the transmitter 36 and the maintenance telephone handset 40 is connected between the telephone lines 16a and 16b, the maintenance telephone handset 40 is connected to the telephone jack 38 of the transmitter 36. Since it has the same telephone circuit as the telephone subunit 20 shown in FIG. 2 or the telephone base unit 28 shown in FIG. 3, which includes a transformer, receiver, and transmitter, the transmitter is By connecting between the telephone lines 16a and 16b, a predetermined line current flows.

The line current accompanying the connection of the maintenance telephone 40 to the telephone jack 38 flows to the telephone line 16a via the resistor 76 of the call detection circuit section 35 shown in FIG. However, the detection voltage output as the call detection signal divided by the resistors 78 and 80 also decreases, and the telephone main unit control unit 46 of the reception control unit 22 stops the connection of the maintenance telephone handset 40 due to the drop in the level of the call detection signal. It is determined, and a screen display indicating that a ring tone is output and the maintenance telephone handset 40 is called is performed.

[Call control between base phone and handset]
(Designated calling of telephone slave unit by telephone base unit)
FIG. 4 is a time chart showing call control in which a telephone base unit specifies and calls a telephone slave unit, and shows the telephone base unit control unit 46 of the receiver 10 shown in FIG. 1 and the telephone repeater shown in FIG. 2. The control operation is performed by the telephone handset control unit 48 of No. 18.

When the person in charge picks up the telephone base unit 28 in order to contact the person in charge in the restricted area, an off-hook detection signal is output from the hook switch 70, and as shown in FIG. It is determined that the telephone base unit 28 is off-hook, and the process proceeds to step S2, where the handset calling screen is displayed on the display 30, and at the same time, the control sound generation unit 64 is instructed to e.g. say “two” from the receiver 72 of the telephone base unit 28. Outputs a continuous line connection sound.

On the handset calling screen displayed on the display 30 in step S2, key buttons arranged as 0, 1 to 9, #, * are displayed, and the handset calling screen is displayed by touching the telephone number of the telephone handset to be called. When the operation is performed, the telephone main unit control unit 46 recognizes the handset calling operation in step S3 and proceeds to step S4, instructing the transmission unit 24 to send a calling command signal specifying the repeater address corresponding to the calling telephone number. The data is then transmitted to the transmission lines 12a and 12b. At this time, the telephone base unit 28 outputs a ringing tone for the telephone slave unit.

When the telephone handset control section 48 of the telephone repeater 18 receives the calling command signal specifying its own address from the transmission section 50 via the transmission lines 12a and 12b, it instructs the control sound generation section 54 in step S5. A call is made in which a ring tone is output from the speaker 61.

When the person in charge at the site picks up the handset 20 in response to this call, off-hook is determined in step S6 based on the off-hook detection signal from the hook switch 60, and in step S7, the transmitter 50 is instructed to include the own address. The incoming call response command signal is transmitted to the receiver 10 via the transmission lines 12a and 12b, and then, in step S8, the connection switching section 52 is instructed to turn on the switch circuit section 56, and the telephone on the telephone handset 20 side is switched on. A call connection is made to connect the circuit section to the telephone lines 16a and 16b.

Upon receiving the incoming call response command signal transmitted from the telephone repeater 18 in step S7, the telephone main unit control unit 46 of the receiver 10 stops outputting the ring tone to the telephone handset 20, and switches the connection in step S9. 62 to turn on the switch circuit section 66 to establish a call connection to connect the telephone base unit circuit section 26 of the telephone base unit 28 to the telephone lines 16a, 16b.

As a result, the telephone main unit 28 and the called telephone handset 20 are connected to the telephone lines 16a, 16b, and a conversation can be made. When the call ends, the telephone main unit 28 and the telephone handset 20 are returned, on-hook is determined in step S10 or S12, and a call cut is performed to disconnect from the telephone lines 16a, 16b in step S11 or S13, thereby ending the call.

(Call of telephone base unit by telephone handset)
FIG. 5 is a time chart showing call control for calling the telephone base unit by the telephone slave unit. When a person in charge in the restricted area picks up the telephone handset 20 to contact the receiver 10, an off-hook detection signal is output from the hook switch 60, and the telephone handset control unit 48 takes steps as shown in FIG. In S21, it is determined that the telephone handset 20 is off-hook, and the process proceeds to step S22, in which the control sound generation unit 54 is instructed to output a line connection sound, which is a continuous tone such as "two", from the receiver 45 of the telephone handset 20.

Subsequently, in step S23, the telephone handset control section 48 instructs the transmission section 50 to send a calling command signal including its own address to the receiver 10 via the transmission lines 12a and 12b. At this time, the telephone handset 20 outputs a ringing tone for the telephone main unit 28.

When the telephone main unit control unit 46 of the receiver 10 receives the calling command signal including the repeater address from the transmission unit 50 via the transmission lines 12a and 12b, it instructs the alarm unit 33 to make a call from the speaker in step S24. A call is made by outputting a sound, and then the process proceeds to step S25, where a handset calling screen is displayed on the display 30 to display the phone number, etc. of the calling handset.

When the person in charge receives the ring tone in step S24 and picks up the telephone base unit 28 provided in the receiver 10, the telephone base unit control unit 46 determines that the telephone base unit 28 is off-hook in step S26, and in step S27 Instructs the transmission section 24 to transmit an incoming call response command signal specifying the repeater address that made the call to the transmission lines 12a, 12b, and in step S28 instructs the connection switching section 62 to turn on the switch circuit section 66. This connects the telephone main unit 28 to the telephone lines 16a and 16b.

On the other hand, upon receiving the incoming call response command signal specifying its own address transmitted from the receiver 10 in step S27, the telephone handset control unit 48 stops the ringing sound for the telephone base unit 28, and proceeds to step S29. By instructing the connection switching section 52 to turn on the switch circuit section 56, the telephone cordless handset 20 is connected to the telephone lines 16a, 16b.

As a result, the telephone slave unit 20 and the called telephone main unit 28 are connected to the telephone lines 16a and 16b, and a conversation can be made. When the call ends, the telephone handset 20 and the telephone main unit 28 are returned, on-hook is determined in step S30 or S32, and call cut is performed to disconnect from the telephone lines 16a, 16b in step S31 or S33, thereby terminating the call connection. .

(Calling the telephone handset while the telephone base unit is talking)
FIG. 6 is a time chart showing call control when the telephone base unit goes off-hook while the telephone base unit is talking with another telephone slave unit.

During a call from the telephone base unit shown in FIG. 4 or a call from the telephone slave unit shown in FIG. After the machine control unit 48 determines that the telephone handset 20 is off-hook in step S41, and outputs a line connection tone from the telephone handset 20 in step S42, it sends a calling command signal including its own address to the transmission line 12a, step S43. 12b to the receiver 10, and a ring tone is output from the speaker of the alarm unit 33.

In this case, the telephone base unit control unit 46 of the receiver 10 receives the calling command signal transmitted from the telephone repeater 18 in step S43, but in step S44, the telephone main unit control unit 46 receives the call command signal transmitted from the telephone repeater 18, but in step S44, the telephone main unit control unit 46 receives the call command signal transmitted from the telephone repeater 18 in step S44. Then, in step S45, a new handset call is displayed on the handset calling screen on the display 30, and then, in step S46, a busy command signal specifying the address of the telephone repeater 18 that sent the calling command signal is sent to the transmission line. 12a and 12b.

When the telephone handset control unit 48 of the telephone repeater 18 receives the busy command signal specifying its own address via the transmission lines 12a and 12b, it instructs the control sound generation unit 54 to control the telephone handset 20 in step S47. A predetermined call tone is output from the receiver 45 of the telephone.

Therefore, the person in charge who picked up the telephone handset 20 knows that the telephone main unit 28 is in the middle of a call and returns the telephone handset 20, and the telephone handset control unit 48 determines on-hook in step S48 and makes a call. Terminate the connection.

(Call switching by calling another phone handset during a call between the phone base unit and phone handset)
FIG. 7 is a time chart showing call control when a phone call is received from another phone handset during a call between the phone base unit and the phone handset and the calls are switched. Here, the telephone repeater 18 that first made the call is called a telephone repeater 18-1, the telephone repeater 18 that made the next call is called a telephone repeater 18-2, and the telephone repeater 18 provided in each The device control section 48 is assumed to be a telephone handset control section 48-1, 48-2, and the telephone handset 20 is assumed to be a telephone handset 20-1, 20-2.

As shown in FIG. 7, the telephone main unit 28 and the telephone sub unit are controlled by the call control unit 46 of the receiver 10 in response to a call from the telephone sub unit control unit 48-1 of the telephone repeater 18-1. A call connection is being made with machine 20-1. The call control in steps S51 to S59 in this case is the same as steps S21 to S29 in FIG. 5, so a description thereof will be omitted.

Subsequently, when the telephone handset control unit 48-2 of another telephone repeater 18-2 determines that the telephone handset 20-2 is hooked off in step S60, after outputting a line connection tone from the telephone handset 20-2, In step S61, the telephone base unit 28 transmits a calling command signal including its own address to the receiver 10 during the call via the transmission lines 12a and 12b.

Upon receiving the calling command signal transmitted from the telephone repeater 18-2, the telephone base unit control unit 46 of the receiver 10 displays a call to the telephone handset 20-2 on the display 30 in step S62, and also A predetermined warning sound is output from the speaker of the alarm unit 33.

As a result, when the person in charge during the call knows that there is a call from another telephone handset 20-2 and performs a selection operation, the telephone main unit control unit 46 selects another telephone handset 20-2 in step S63. -2 selection operation is recognized, the process proceeds to step S64, and an incoming call response command signal specifying the address of the telephone repeater 18-2 is transmitted to the transmission lines 12a, 12b, and this is received by the telephone repeater 18-2. , the telephone handset controller 48-2 connects the telephone handset 20-2 to the telephone lines 16a, 16b in step S65.

Further, in step S66, the telephone main unit control unit 46 transmits a hold command signal specifying the address of the telephone repeater 18-1 of the telephone handset 20-1 that was in the middle of a call to the transmission lines 12a and 12b. , this is received by the telephone repeater 18-1, and the telephone handset control unit 48-1 performs a call cut to disconnect the telephone handset 20-1 from the telephone lines 16a, 16b in step S67, and also disconnects the telephone handset 20-1 from the telephone handset 20-1. Output a predetermined hold tone.

Thereafter, when the telephone call between the telephone base unit 28 and the telephone slave unit 20-2 ends and the telephone slave unit control unit 48-2 determines on-hook in step S68, the process proceeds to step S69, and a call termination command signal including the own address is sent. It is transmitted to transmission lines 12a and 12b.

When the telephone main unit control unit 46 determines that the call end command signal has been received from the telephone repeater 18-2, in step S70, the telephone main unit control unit 46 sends a hold release command signal specifying the address of the telephone repeater 18-1 that is on hold to the transmission line. 12a, 12b, and when the telephone handset controller 48-1 receives the hold release command signal specifying its own address, it stops outputting the hold tone from the telephone handset 20-1 in step S71, and The device 20-1 is connected to the telephone lines 16a and 16b again, and communication with the telephone base device 28 is resumed.

(3-way call)
FIG. 8 is a time chart showing the call control of a three-party call between a telephone base unit and two telephone handsets.Similar to FIG. 20 and the telephone handset controller 48 are respectively designated as telephone repeaters 18-1 and 18-2, telephone handsets 20-1 and 20-2, and telephone handset controllers 48-1 and 48-2.

In the three-party call shown in FIG. 8, the controls in steps S81 to S92 are the same as those in steps S51 to S62 shown in FIG. 7, so the explanation thereof will be omitted.

In the three-party call shown in FIG. 8, while the telephone base unit 28 and telephone slave unit 20-1 are connected, a call command signal is sent from the telephone repeater 18-2 of another telephone slave unit 20-2. When the call from the telephone handset 20-2 is displayed on the display 30 in step S92, a three-way call selection button is displayed on the display screen, and a three-way call selection operation can be performed.

For this reason, when the telephone main unit control unit 46 recognizes the selection operation of the three-party call in step S93, the process proceeds to step S94, and an incoming call command signal specifying the address of the telephone repeater 18-2 that sent the outgoing call command signal is transmitted. The telephone handset control section 48-2 receives the information and connects the telephone handset 20-2 to the telephone lines 16a, 16b in step S95.

Subsequently, in step S96, the telephone base unit control unit 46 sequentially transmits three-party call command signals specifying the addresses of the telephone repeaters 18-1 and 18-2 to the transmission lines 16a and 16b, and the telephone base unit that received the command signals In steps S97 and S98, the machine control units 48-1 and 48-2 output a predetermined message from the telephone slave units 20-1 and 20-2 to notify the start of a three-party call, and thereby the telephone base unit control unit 46 In step S99, the three-party call shown in steps S100 and S101 of the telephone handset control units 48-1 and 48-2 connects the telephone main unit 28 and the telephone handsets 20-1 and 20-2 to the telephone line 16a, 16b.

Here, by connecting a plurality of telephone handsets 20 in addition to the telephone main unit 28 to the telephone lines 16a, 16b, it is possible to realize four-party calls, five-party calls, etc. As the number of connections increases, the level of the audio signals transmitted by the telephone lines 16a and 16b decreases, deteriorating the call quality. A three-way call in which three telephones are connected to telephone lines 16a and 16b is optimal.

(Call control performed by connecting a maintenance telephone handset to the telephone jack)
FIG. 9 is a time chart showing call control performed by connecting an emergency telephone handset to a telephone jack.

As shown in FIG. 9, the person in charge carrying the maintenance telephone handset 40 inserts the plug 42 of the maintenance telephone handset 40 into the telephone jack 38 of the transmitter 36 in step S111 in order to contact the receiver 10 side. Then, the maintenance telephone handset 40 is connected to the telephone lines 16a and 16b, and a line current flows, and the call detection circuit section 35 of the receiver 10 detects a drop in line voltage in step S112, and the telephone main unit control section 46 detects a drop in the line voltage. Outputs a call detection signal.

The telephone main unit control unit 46, which has received the call detection signal from the call detection circuit unit 35, instructs the alarm unit 33 to output a ring tone from the speaker in step S113 to make a call, and then in step S114. Then, the call of the maintenance telephone handset 40 is displayed on the display 30 and notified.

When the person in charge receives the ringing tone in step S113 and picks up the telephone base unit 28 provided in the receiver 10, the telephone base unit control unit 46 determines that the telephone base unit 28 is off-hook in step S115, and in step S116 By instructing the connection switching section 62 to turn on the switch circuit section 66, the telephone main unit 28 is connected to the telephone lines 16a, 16b, and a telephone communication connection is established with the maintenance telephone handset 40.

When the call ends, the telephone base unit 28 is returned, and the telephone base unit control unit 46 determines whether the telephone base unit 28 is on-hook in step S117, and performs a call cut to disconnect from the telephone lines 16a, 16b in step S118, thereby establishing the call connection. finish.

Further, when the call ends, the maintenance telephone handset 40 is removed from the telephone jack 38 in step S119, and the connection with the telephone lines 16a, 16b is released, and in step S120, the line voltage is restored in the call detection circuit 35, The output of the notification detection signal stops.

[Fire alarm equipment equipped with emergency telephone equipment and maintenance telephone equipment]
(Overview of equipment)
FIG. 10 is an explanatory diagram showing an embodiment of a fire alarm system having a call control function for emergency telephone equipment linked to emergency broadcast equipment and maintenance telephone equipment used for maintenance and inspection.

As shown in FIG. 10, transmission lines 12a and 12b for fire alarm equipment, emergency telephone lines 16c and 16d for emergency telephone equipment, and maintenance telephone lines 84a and 84b for maintenance telephone equipment are drawn out from the receiver 10 to the restricted area. There is.

A plurality of fire detectors 14 each having a transmission function, a repeater 15, and an addressable transmitter 37 are connected to the transmission lines 12a and 12b. Further, a plurality of telephone repeaters 18 provided with emergency telephone handsets 20a are connected to the transmission lines 12a, 12b and the emergency telephone lines 16c, 16d, and a unique address is set to the telephone repeaters 18, and Has functions and call control functions.

Further, a transmitter 36 is connected to the repeater 15 of the transmission lines 12a and 12b. The transmitter 36 is provided with a transmitter button 36a, and when the transmitter button 36a is pressed and turned on in the event of a fire, a transmission signal is output to the repeater 15, and transmitted from the repeater 15 to the receiver 10 via the transmission lines 12a and 12b. A fire notification signal is sent to the station, and a fire alarm is output.

The transmitter 36 is provided with a telephone jack 38, and the telephone jack 38 is connected to maintenance telephone lines 84a and 84b. When the person in charge inserts the plug 42 of the maintenance telephone handset 40a carried by the person in charge into the telephone jack 38, the maintenance telephone handset 40a is connected to the maintenance telephone lines 84a and 84b, and the telephone main unit 28 provided in the receiver 10 is connected to the maintenance telephone lines 84a and 84b. A call connection is established and you can make a call.

Like the transmitter 36, the addressable transmitter 37 is also provided with a transmitter button 37a, and when the transmitter button 37a is pressed and turned on in the event of a fire, the transmitter 37b notifies the receiver 10 of the fire via the transmission lines 12a and 12b. A signal is sent and a fire alarm is output.

Like the transmitter 36, the addressable transmitter 37 is provided with a telephone jack 38, and the telephone jack 38 is connected to maintenance telephone lines 84a and 84b. When the person in charge inserts the plug 42 of the maintenance telephone handset 40a carried by the person in charge into the telephone jack 38, the maintenance telephone handset 40a is connected to the maintenance telephone lines 84a and 84b, and the telephone main unit 28 provided in the receiver 10 is connected to the maintenance telephone lines 84a and 84b. A call connection is established and you can make a call.

The receiver 10 is provided with a telephone main unit 28 corresponding to the emergency telephone handset 20a and the maintenance telephone handset 40a.

Further, in this embodiment, in addition to the fire alarm equipment, an emergency broadcasting equipment is provided, and an emergency broadcasting board 90 installed in the same manager's room as the receiver 10 is used to inform the warning area, for example, by floor. Broadcast lines 92 are drawn out separately for each system, and broadcast speakers 94 are connected to the broadcast lines 92.

(Functional configuration of receiver)
The receiver 10 includes a reception control section 22, a transmission section 24, an emergency telephone main circuit section 26a, a maintenance telephone main circuit section 26b, a telephone main device 28, a display 30 with a touch panel, a display section 31, an operation section 32, and a speaker. The alarm unit 33 includes an alarm unit 33, a transfer unit 34, a call detection circuit unit 35, and a switching unit 82.

The reception control section 22 of the receiver 10 is provided with the function of a telephone main unit control section 46 as a function realized by the execution of a program by the CPU. Since the fire monitoring control section 44 is the same as the embodiment shown in FIG. 1, its explanation will be omitted.

(Telephone main unit control unit)
The telephone main unit control unit 46 performs call control for incoming calls to the emergency telephone handset 20a, call control for incoming calls to the maintenance telephone handset 40a, and calls when calls to the emergency telephone handset 20a and maintenance telephone handset 40a overlap. Take control.

The telephone repeater 18 is the same as shown in FIG. 2, and the call detection circuit 35 is the same as that shown in FIG. The emergency telephone base circuit unit 26a and the maintenance telephone base circuit unit 26b are basically the same as the telephone base unit circuit unit 26 in FIG. 3, but a switching unit 82 is provided between them and the base phone 28, The difference is that when an emergency call is received, the base phone 28 is switched to the emergency phone base circuit 26a side, and when a maintenance call is received, the base phone 28 is switched to the maintenance phone base circuit 26b.

[Call control]
The telephone main unit control unit 46 detects a call based on a calling command signal including a caller address from the emergency telephone handset 20a via the telephone repeater 18 and the repeater 15, and/or detects a call from the call detection circuit unit 35. Based on the signal, an operation display necessary for controlling a call with the telephone base unit 28 is displayed on the display 30, and the following call control is performed based on screen operations and the like.

(Incoming maintenance call)
When an inspection personnel inserts the plug 42 of the maintenance telephone handset 40a carried by him or her into the telephone jack 38 of the transmitter 36 or the addressable transmitter 37 and connects it to the maintenance telephone lines 84a, 84b, the maintenance telephone The call detection circuit section 35 of the receiver 10 detects the line current flowing when the telephone base unit 40a is connected, and outputs a call detection signal to the telephone base unit control section 46.

The telephone main unit control unit 46 which has received the call detection signal from the call detection circuit unit 35 displays an incoming maintenance call on the display 30 and outputs a predetermined maintenance call ringtone (maintenance call ringtone) from the speaker of the alarm unit 33. The telephone base unit 28 is switched to the maintenance telephone base unit circuit unit 26b by the switching unit 82.

When a disaster prevention manager or the like on the receiver 10 side who learns of such a maintenance call picks up the telephone base unit 28, based on the off-hook detection of the telephone base unit 28, the telephone base unit 28 switches to the maintenance telephone base unit circuit section 26b. The maintenance telephone handset 40a is connected via the maintenance telephone lines 84a and 84b, and necessary telephone calls can be made.

(Emergency call received)
When a lifeguard or the like discovers a fire while patrolling, the hook switch is turned on when the emergency telephone handset 20a installed nearby is turned on, and the signal is sent to the receiver 10 via the telephone repeater 18 and repeater 15. A calling command signal including a calling source address is sent to the sender. The telephone main unit control unit 46 of the receiver 10 that has received the calling command signal from the emergency telephone handset 20a displays the incoming emergency call on the display 30 along with the calling location based on the calling address, and sends a message from the speaker of the alarm unit 33. A predetermined emergency telephone ring tone (emergency telephone ring tone) is output, and the telephone main unit 28 is switched to the emergency telephone main unit circuit section 26a by the switching section 82.

When a disaster prevention manager or the like on the receiver 10 side who learns of the arrival of such an emergency call picks up the telephone base unit 28, the telephone base unit 28 connects the emergency telephone lines 16c and 16d based on the off-hook detection of the telephone base unit 28. A call connection is made to the handset handset 20a that made the call through the phone, and necessary calls can be made.

Further, when the telephone base unit control unit 46 of the receiver 10 receives a call command signal by picking up the emergency telephone handset 20a via the telephone repeater 18 and the repeater 15, the telephone main unit control unit 46 of the receiver 10 controls the telephone main unit control unit 46 within a predetermined time, for example, 10 seconds. Within this time, the control section 34 instructs the transfer unit 34 to output a fire transfer signal including the area where the fire occurred based on the source address to the emergency broadcast board 90.

The emergency broadcasting board 90, which has received the fire transmission signal from the receiver 10, specifies the floor where the fire occurred and the floor immediately above it as the broadcasting area, and broadcasts the fire. For example, this fire broadcast may read, "There is a fire. There is a fire. A fire has broken out in the ○○ area. Please remain calm and evacuate." Further, the emergency broadcast board 90 broadcasts the emergency broadcast to all the broadcast areas at the same time when a predetermined time has elapsed from the start of the emergency broadcast.

(Receiving duplicate emergency calls)
Furthermore, when calls from a plurality of emergency telephone slave units 20a overlap, the telephone main unit control unit 46 of the receiver 10 displays the plurality of callers on the display 30, and displays the emergency caller selected by screen operation. It controls the communication connection with the telephone handset 20a. At this time, control is performed to output a hold tone from the emergency telephone handsets that have not been selected.

(Receiving duplicate emergency calls and maintenance calls)
In addition, when the calls from the emergency phone handset 20a and the maintenance phone handset 40a overlap, the telephone main unit control unit 46 of the receiver 10 displays the incoming emergency call and the maintenance call on the display 30, and operates the screen. Control is performed to establish a call connection with the emergency telephone handset 20a or the maintenance telephone handset 40a selected by the caller. At this time, control is performed to output a hold tone from the telephone handsets that are not selected. Note that priority may be set in advance for incoming emergency calls and maintenance calls, and the called party with a higher priority may be selected and connected.

(Another form of display for emergency calls and maintenance calls)
Further, incoming calls to the emergency telephone handset 20a may be displayed on the display 30, and incoming calls to the maintenance telephone handset 40a may be indicated by a maintenance telephone light disposed within the panel. Since the emergency telephone handset 20a transmits an emergency telephone call signal including a unique caller address, the installation location can be recognized, so it is preferable to indicate the caller on the display 30.

(Communication of connection location identification information when connecting a maintenance phone handset)
When the maintenance telephone handset 40a is connected to the transmitter 36 or the addressable transmitter 37, the transmitter 36 or the addressable transmitter 37 detects the connection of the plug and receives address information on the transmission circuit from the receiver 10. The receiver 10 may display information identifying the transmitter 36 or the addressable transmitter 37 to which the maintenance telephone handset 40a is connected based on the information. By making it possible to display which call destination is the emergency telephone handset 20a or the maintenance telephone handset 40a, it becomes possible to help determine which call should be prioritized.

[Modification of the present invention]
(telephone jack)
Although the above embodiment takes as an example a case in which a telephone jack is provided in a transmitter, a telephone jack may be provided in an appropriate terminal device as necessary. Further, the maintenance telephone equipment is not limited to a portable type, and may be a maintenance telephone slave unit that is fixedly installed in a restricted area and is used by being plugged into a telephone jack.

Further, a telephone jack may be provided on the receiver 10. For example, the positive and negative sides of a telephone jack are connected via capacitors between the telephone lines 16a and 16b drawn out from the call detection circuit section 35 shown in FIG. 3 to the terminal side, respectively. In this case, by connecting the maintenance telephone handsets to the telephone jack of the receiver and the telephone jack of the transmitter by plugging them into each other, it is possible to establish a call connection between the maintenance telephone handsets.

(Maintenance phone handset priority and phone handset hold tone)
The telephone base unit control unit 46 of the above embodiment performs maintenance when detecting connection of the maintenance telephone base unit 40 to the telephone jack 38 during a call connection between the telephone base unit 28 and any emergency call slave unit 20. It notifies the telephone handset 40a of the call, switches to the maintenance telephone handset 40, and sends a hold command signal specifying the address of the telephone relay section 18 of the emergency telephone handset 20 that is currently on the call to make an emergency call. The handset 20 is disconnected from the telephone lines 16a, 16b and a predetermined on-hold tone is output.

As a result, if the maintenance telephone handset 40 is connected to the telephone jack 38 during a call between the telephone base unit 28 and the emergency telephone handset 20, the previous call connection between the telephone base unit 28 and the emergency telephone handset 20 is suspended. It is possible to preferentially make a call to the maintenance telephone handset 40.

Furthermore, when the call between the telephone base unit 28 and the maintenance telephone handset 40 ends, the telephone base unit control unit 46 transmits a hold release command signal specifying the address of the telephone relay unit 18 of the emergency telephone handset 20 that is on hold. Alternatively, the emergency telephone handset 20 may be connected to the telephone lines 16a, 16b to restore communication between the telephone main unit 28 and the emergency telephone handset 20.

(Calls between telephone handsets)
Although the above embodiment takes as an example the call control between the telephone base unit of the receiver and the telephone slave unit installed in a restricted area, the present invention is not limited to this, and the telephone number may be input into the telephone repeater. By providing an operation display unit for making a call, it may be possible to make a call between one telephone handset by specifying a call from one telephone handset to another telephone handset.

(Hands-free calling function)
Although the above embodiment takes as an example a call between a telephone base unit and a telephone handset, the present invention is not limited to this. It may be installed on a panel near the telephone, and by operating a predetermined switch, the telephone can be switched to a microphone and a speaker, thereby providing a hands-free calling function for talking without using the telephone.

(P type receiver)
The above embodiment takes as an example a fire alarm system in which an R-type fire detector is connected via a transmission line from an R-type receiver, but an address is connected to a detector line drawn out from a P-type receiver. Similarly, similar communication control can be achieved for fire alarm equipment connected to addressable fire detectors equipped with settings and transmission functions by transmitting and receiving various command signals using the detector line.

(others)
Furthermore, the present invention includes appropriate modifications without impairing its objects and advantages, and is not limited by the numerical values shown in the above embodiments.

10: Receivers 12a, 12b: Transmission line 14: Fire detector 15: Repeaters 16a, 16b: Telephone lines 16c, 16d: Emergency telephone line 18: Telephone repeater 20: Telephone handset 20a: Emergency telephone handset 22: Reception control units 24, 50: Transmission unit 26: Telephone base unit circuit unit 26a: Emergency telephone base unit circuit unit 26b: Maintenance telephone base unit circuit unit 28: Telephone base unit 30: Display 35: Call detection circuit unit 36: Transmitter 37: Addressable transmitter 38: Telephone jack 40: Maintenance telephone handset 40a: Maintenance telephone handset 44: Fire monitoring control unit 46: Telephone main unit control unit 45, 72: Receiver 47, 74: Transmitter 48: Telephone handset Machine control section 52, 62: Connection switching section 54, 64: Control sound generation section 56, 66: Switch circuit section 58, 68: Transformer 60, 70: Hook switch 61, 94: Speaker 76, 78, 80: Resistor 82: Switching parts 84a, 84b: Maintenance telephone line 90: Emergency broadcast board 92: Broadcast line

Claims (3)

Terminal equipment including a telephone repeater is connected to a transmission line drawn out from the receiver to the guarded area, and the telephone repeater is connected to a telephone line also drawn out from the receiver to the guarded area and connected to a telephone jack. In fire alarm equipment connected to
The receiver includes:
A call connection is possible with a first telephone handset connected to the telephone line via the telephone repeater and a second telephone handset connected to the telephone line through the telephone jack,
A call connection with the first telephone handset is controlled by transmitting and receiving a predetermined call control signal via the transmission line,
The call connection with the second telephone handset is controlled by the connection state of the second telephone handset to the telephone jack,
If a connection of the second telephone handset to the telephone jack is detected during a call connection with the first telephone handset, switching is made to a call connection with the second telephone handset. Notification equipment.
In the fire alarm equipment according to claim 1,
The receiver detects the connection of the second telephone handset to the telephone jack during a call connection with the first telephone handset, and when switching to the call connection with the second telephone handset, A hold command signal is sent via the transmission line to the telephone repeater connected to the first telephone handset that was connected to the call, and a hold tone is output from the first telephone handset that was connected to the call. Fire alarm equipment characterized by:
A transmission line led out from the receiver to the restricted area and connected to terminal equipment including a telephone repeater;
a first telephone line led out from the receiver to the guarded area and connected to the telephone repeater;
a second telephone line led from the receiver to the guarded area and connected to a telephone jack;
In fire alarm equipment equipped with
The receiver includes:
A call connection is possible between a first telephone handset connected to the first telephone line via the telephone repeater and a second telephone handset connected to the second telephone line via the telephone jack. ,
A call connection with the first telephone handset is controlled by transmitting and receiving a predetermined call control signal via the transmission line,
A fire alarm system characterized in that a call connection with the second telephone handset is controlled by a connection state of the second telephone handset to the telephone jack.

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