JP2006157180A - Intercom system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly specify a fire alarm that is activated on the occurrence of a fire and reducing noise sound to neighboring houses due to erroneous alarming. <P>SOLUTION: When an alarm stop switch 8a (alarm stop button 13) of a master unit 1 is operated, only an activated fire alarm 40 for determining a fire breakout continues alarming of an alarm tone, and the fire alarms 40 not determining the fire breakout other than the activated fire alarm stop alarming of the alarm tone. Thus, the interphone system can quickly prescribe the activated fire alarm 40. Further, if the determination of the fire breakout by the activated fire alarm 40 is wrong, since the operation of the alarm stop switch 8a allows all the fire alarms 40 to immediately stop the alarming of the alarm tone, the noise sound delivered to the neighboring houses due to erroneous alarming can be reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an intercom system, and more particularly to an intercom system that issues a fire alarm in conjunction with a fire alarm.

  In recent years, fire alarms that detect the occurrence of a fire and emit an alarm sound are becoming popular in general dwelling units. As a conventional fire alarm, it is attached to the ceiling or wall of a dwelling unit, and when a heat or smoke accompanying a fire is detected, a buzzer is driven to sound an alarm sound, which is provided as an integral or separate alarm There is one that stops ringing of an alarm sound when a stop switch is operated (for example, see Patent Document 1). Alternatively, fire alarms installed in each room such as the kitchen, living room, bedroom, etc. are connected by signal lines, and the alarm signal is sent via the signal line from the fire alarm that detects the occurrence of a fire to other fire alarms. There is also provided an alarm sound that is emitted from all fire alarms.

On the other hand, it consists of a doorphone unit installed at the entrance outside the dwelling unit and an interphone main unit installed inside the dwelling unit. When a visitor operates the call button on the doorphone sub unit, a ringing tone is output from the interphone main unit. However, interphone systems in which a housekeeper makes a call between the interphone master unit and the door phone slave unit by operating the response button of the interphone master unit are widely used. Further, there is also provided an apparatus in which a warning sound is output from an interphone master unit by connecting a plurality of fire alarms to the interphone master unit via a signal line (see, for example, Patent Document 2).
JP-A-4-297990 JP 2003-250151 A

  By the way, in an intercom system in which multiple fire alarms and interphone master units issue a fire alarm, all fire alarms and interphone master units output alarm sounds all at once so that fires can be quickly However, it is not possible to easily determine which fire alarm is installed from the source of the fire. In fact, check all the rooms where the fire alarm is installed. There was a problem that the source of the fire had to be specified, leading to delays in evacuation. Also, when the alarm of the fire alarm was a false alarm, the noise caused by the alarm sound could be annoying the neighborhood.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an intercom system that can quickly identify a fire alarm as a source of operation when a fire occurs and can reduce noise to neighboring neighbors due to false alarms. It is to provide.

  In order to achieve the above object, the invention of claim 1 includes an intercom master unit installed at the entrance outside the dwelling unit, etc., and an intercom master unit that is installed inside the dwelling unit and makes a call between the door phone sub unit, In an intercom system that is installed in a dwelling unit and consists of multiple fire alarms that detect the occurrence of a fire and emit an alarm sound, the fire alarm has a detector that detects heat and smoke from the fire, and an alarm sound. A fire has occurred based on the detection output of the alarm unit that rings, the transmission / reception unit that transmits the alarm signal to other fire alarms via the signal line and receives the alarm signal from other fire alarms, and the detection unit Or when the alarm signal is received from another fire alarm in the transmitter / receiver unit, the alarm unit is controlled to sound an alarm sound, and when it is determined that a fire has occurred, the transmitter / receiver unit is controlled to generate an alarm signal. Send And a control unit that has a switch that can be manually operated, and that causes the control unit to stop sounding an alarm sound when the switch is operated. A voice input / output unit, a master transmission / reception unit that receives an alarm signal from each fire alarm device via a signal line and transmits an alarm stop signal to each fire alarm device via a signal line, and a master unit A master unit control unit that outputs an alarm sound from the voice input / output unit when an alarm signal is received from any fire alarm in the transmission / reception unit, and a master unit operation unit having a manually operable alarm stop switch, The master unit control unit of the intercom master unit stops the output of the alarm sound when the alarm stop switch of the master unit operation unit is operated, and controls the master unit transmission / reception unit to transmit the alarm stop signal, The control unit When the alarm stop signal is received by the transmitter / receiver while the alarm is sounding, the alarm is controlled to stop the alarm sound if it is not judged that a fire has occurred. If it is determined that the alarm has been performed, the alarm unit continues to sound an alarm sound.

  According to the first aspect of the present invention, when at least one of the fire alarms detects the occurrence of a fire, all the fire alarms and the intercom master unit sound an alarm sound to reliably notify the family members of the occurrence of the fire. When the alarm stop switch on the intercom master unit is operated, only the fire alarm that has been determined to have fire has continued to sound and has not determined that a fire has occurred. Since the fire alarm device other than the operation source stops the sound of the alarm sound, the fire alarm device of the operation source can be quickly identified, and further, there is an effect that the noise to the neighboring area due to the false alarm can be reduced.

(Embodiment 1)
As shown in FIGS. 1 and 2, the intercom system of the present embodiment is an interphone that is installed at a doorway outside a dwelling unit, etc., and an interphone that is installed inside a dwelling unit and makes a call between the doorphone sub unit 20. A master unit (hereinafter abbreviated as “master unit”) 1 and a plurality of fire alarms 40 that are installed in a dwelling unit and detect the occurrence of a fire and emit an alarm sound. Here, the door phone slave unit 20 is connected to the parent device 1 by two pairs of communication lines L1 including a two-wire communication line and a two-wire control line, and the plurality of fire alarm devices 40 are connected to the parent device by a signal line Ls. 1 is multidrop connected.

  The door phone sub unit 20 receives a voltage applied to the call line by the base unit 1 to create an internal operating power source, and performs a two-to-four line conversion between the internal call path and the call line; A voice input / output unit 22 having a microphone and a speaker, a voice processing unit 23 for amplifying a voice signal inputted from the microphone, amplifying a voice signal sent from the master unit 1 through a call line, and the like, A camera unit 24 that has an optical system such as an individual image sensor and a lens and images a visitor, a video processing unit 25 that modulates the frequency of a video signal output from the camera unit 24, and a call button 28 An operation unit 26 that has a switch that is turned on when (see FIG. 1) is pressed and that sends a call signal by changing the line voltage of the telephone line when the switch is turned on. Via control line Sent the incoming alarm indication signal and a display unit 27 to blink the display device receives (described later) (light emitting diodes). Here, the video signal (hereinafter referred to as “FM video signal”) frequency-modulated to the audio signal (baseband signal) output from the audio processing unit 23 is multiplexed by the power receiving unit 21 and is transmitted through the communication line to the master unit. Sent to 1.

  The fire alarm 40 includes a detection unit 41 that detects heat and smoke (or both) due to a fire, an alarm unit 42 that has a buzzer and the like, and a display element (such as a light emitting diode). The display unit 43 that displays the occurrence of a fire on the display element, and transmission / reception that transmits an alarm signal to the other fire alarm device 40 and the master unit 1 and receives an alarm signal from the other fire alarm device 40 via the signal line Ls. The alarm unit 42 is controlled to generate an alarm sound when it is determined that a fire has occurred based on the detection output of the unit 46 and the detection unit 41 or when an alarm signal is received from another fire alarm 40 in the transmission / reception unit 46. And a control unit 45 that controls the display unit 43 to blink the display element and controls the transmission / reception unit 46 to transmit an alarm signal when it is determined that a fire has occurred, and an alarm stop switch. There includes an operation unit 44 for stopping the sounding of the alarm sound to the control unit 45 when it is operated, and a power supply unit 47 to create an operating power supply of each unit from a commercial power source. The transmission / reception unit 46 transmits / receives an alarm signal or the like by applying a square-wave pulse voltage to the two-wire signal line Ls and detecting the pulse voltage applied to the signal line Ls.

  The base unit 1 applies a DC voltage to the communication line L1 (call line) to supply power to the door phone slave unit 20, and also feeds the multiplexed audio signal and FM video signal, The main unit control unit 3 having a microcomputer as a main component, a voice input / output unit 4 having a microphone and a speaker, and a doorphone slave unit 20 separated by a power supply unit 2 from a voice signal input from the voice input / output unit 4 The voice switch function for switching the call direction (base unit 1 → doorphone slave unit 20 or base unit 1 ← door phone slave unit 20) by attenuating the voice signal with the lower signal level by comparing with the voice signal from The audio processing unit 5, the display unit 6 including a liquid crystal display (LCD), and the FM video signal sent from the door phone slave unit 20 are demodulated and output to the display unit 6 to display the video. The image processing unit 7, a call switch that is turned on by operating the call button 11, a monitor switch that is turned on by operating the monitor button 12, and an alarm stop switch 8a that is turned on by operating the alarm stop button 13 are turned on. A base unit operation unit 8 that outputs a corresponding operation signal to the base unit control unit 3 sometimes, and a warning signal from each fire alarm device 40 via the signal line Ls and a signal to each fire alarm unit 40 A base transceiver unit 9 that transmits an alarm stop signal via the line Ls and a power source unit 10 that creates an operating power source for each unit from a commercial power source are provided. In addition, in the main | base station transmission / reception part 9, similarly to the transmission / reception part 46 of the fire alarm device 40, while applying a pulse voltage to the signal wire | line Ls and detecting the pulse voltage applied to the signal wire | line Ls, an alarm signal etc. are transmitted / received. .

  Next, basic operations of the master unit 1 and the door phone slave unit 20 will be described.

  First, when a visitor presses the call button 28 of the door phone cordless handset 20, the operation unit 26 transmits a call signal from the power receiving unit 21 to the base unit 1 via the communication line L1 (call line), and further the video processing unit 25. The camera unit 24 is activated, and the visitor image captured by the camera unit 24 is transmitted from the power receiving unit 21 to the base unit 1 via the communication line L1 (call line). In the base unit 1, the base unit control unit 3 that has detected the calling signal controls the voice processing unit 5 to ring the ringing sound from the speakers of the voice input / output unit 4, and the FM transmitted from the doorphone slave unit 20. The video signal is demodulated by the video processing unit 7 and the video of the visitor is displayed on the display unit 6. When the housekeeper presses the call button 11 of the base unit 1, an operation signal is output from the base unit operation unit 8, and the base unit control unit 3 that receives this operation signal is connected to the voice processing unit 5 and the voice input / output unit 4. A call path is formed between the communication lines L1 (call lines) and a call is made with the door phone slave unit 20. When the monitor button 12 is pressed and an operation signal is output from the base unit operation unit 8, the base unit control unit 3 that has received the operation signal is supplied from the power supply unit 2 via the communication line L1 (call line). Since power is supplied to the door phone slave unit 20 and the camera unit 24 and the video processing unit 25 of the door phone slave unit 20 are activated and an image captured by the camera unit 24 is sent to the base unit 1, the door phone slave unit is displayed on the display unit 6. Images captured by the 20 camera units 24 are displayed.

  Next, the operation when the fire alarm 40 determines that a fire has occurred will be described with reference to the time chart of FIG.

  In any fire alarm device 40, when the control unit 45 determines that a fire has occurred based on the detection output of the detection unit 41, the control unit 45 controls the alarm unit 42 to sound an alarm sound and display it. The display element is blinked by controlling the unit 43, and the transmission / reception unit 46 is further controlled to send an alarm signal to the signal line Ls. Here, an alarm signal, an alarm stop signal, or a return signal, which will be described later, is transmitted by applying a square-wave pulse voltage to the two-wire signal line Ls, and the signal format is defined as shown in FIG. That is, it consists of a start pulse indicating the start of signal transmission, an alarm signal, an alarm stop signal, a command pulse corresponding to the return signal, and an end pulse indicating the end of signal transmission. When the command pulse is L or H, the alarm signal, H , L represents an alarm stop signal, and H, H represents a return signal.

  On the other hand, when the other fire alarm device 40 receives an alarm signal transmitted from the fire alarm device 40 (hereinafter referred to as “actuator fire alarm device”) 40 that has been determined to have a fire, Similar to the alarm device 40, the control unit 45 controls the alarm unit 42 to sound an alarm sound and also controls the display unit 43 to blink the display element. In the base unit 1, when the base unit transmission / reception unit 9 receives the alarm signal transmitted from the fire alarm 40 that is the operation source, the base unit control unit 3 controls the voice processing unit 5 and the speaker of the voice input / output unit 4. Then, an alarm sound is generated and the image processing unit 7 is controlled to display a pictograph for notifying the occurrence of a fire on the screen of the display unit 4. As described above, when any fire alarm 40 determines that a fire has occurred, it is possible to promptly notify the family members of the occurrence of the fire by sounding an alarm sound with all the fire alarms 40 and the master unit 1. .

  Here, in the fire alarm device 40 other than the operating source, the alarm sound and the blinking of the display element are continued until the alarm stop switch of the operation unit 44 is operated, and the operation accompanying the operation of the alarm stop switch from the operation unit 44. When the signal is input, the control unit 45 controls the alarm unit 42 and the display unit 43 to stop the alarm sound and the display element from blinking.

  On the other hand, when the alarm stop button 13 of the master unit 1 is pressed and the alarm stop switch 8a is turned on and an operation signal is input from the master unit operation unit 8 to the master unit control unit 3, the master unit control unit 3 The processing unit 5 and the video processing unit 7 are controlled to stop the sounding of the alarm sound and the display of the pictograph, and the master unit transmitting / receiving unit 9 is controlled to send an alarm stop signal to the signal line Ls. In the fire alarm device 40 other than the operating source, when the alarm stop signal is received by the transmission / reception unit 46, the control unit 45 controls the alarm unit 42 and the display unit 43 to stop the sounding of the alarm sound and the flashing of the display element. However, in the fire alarm device 40 at the operation source, while it is determined that a fire has occurred based on the detection output of the detection unit 41, the control unit 45 generates an alarm sound even if an alarm stop signal is received. Continue ringing and blinking of the display element. That is, when the alarm stop switch 8a (alarm stop button 13) of the master unit 1 is operated, only the fire alarm device 40 that has been determined to have fire has continued to sound, and it has been determined that a fire has occurred. Since the fire alarm device 40 other than the operating source that has not been operated stops the sounding of the alarm sound, the operating fire alarm device 40 can be quickly identified. In addition, if the fire alarm in the fire alarm 40 of the operating source is wrong, all the fire alarms 40 immediately stop sounding due to the operation of the alarm stop switch 8a. The noise can be reduced.

  When the fire is extinguished and the control unit 45 no longer determines that a fire has occurred, the fire alarm 40 at the operation source controls the alarm unit 42 and the display unit 43 to stop the alarm sound and the display element from blinking. At the same time, a return signal is sent from the transmitter / receiver 46 to the signal line Ls. When this return signal is received, the alarm device 40 other than the activation source and the master unit 1 stop the alarm sound and return to normal operation in the same manner as when the alarm stop button 13 or the like is operated. To do.

(Embodiment 2)
The present embodiment is characterized by a signal transmission method between the master unit 1 and the fire alarm device 40. Other system configurations and basic configurations of the master unit 1, the door phone slave unit 20, and the fire alarm unit 40 are implemented. Since it is the same as that of the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 5, the base transceiver unit 9 of the base unit 1 and the transceiver unit 46 of the fire alarm 40 are a 5-wire signal line composed of first to fourth signal lines Ls1 to Ls4 and a ground line GND. Ls is connected, and various information such as an alarm stop signal is transmitted and received according to the potential (H level or L level) of each signal line Ls1 to Ls4 with respect to the ground line GND. That is, the first signal line Ls1 is at the H level when the control unit 45 determines that a fire has occurred and when the signal line Ls is disconnected, and at the L level during other normal operations. The signal line Ls2 is at the H level when the alarm sound is not sounding, and is at the L level when the alarm sound is sounding. The third signal line Ls3 is at the H level during the normal time, and the master unit 1 to the fire alarm 40. The L level is set when the alarm stop signal is transmitted, and the fourth signal line Ls4 is set at the H level during normal operation and at the L level when disconnection occurs.

  Next, the operation when the fire alarm 40 determines that a fire has occurred will be described with reference to the time chart of FIG.

  In any one of the fire alarms 40, when the control unit 45 determines that a fire has occurred based on the detection output of the detection unit 41 (time t = t1), the control unit 45 controls the alarm unit 42 to alarm. The sound is generated and the display unit 43 is controlled to blink the display element, and the transmission / reception unit 46 is controlled to send an alarm signal to the signal line Ls. That is, the first signal line Ls1 is changed from L level to H level, and the second signal line Ls2 is changed from H level to L level.

  On the other hand, in the other fire alarm device 40, the voltage of each signal line Ls1 to Ls4 of the signal line Ls is constantly monitored by the transmission / reception unit 46, and the voltage levels of the first and second signal lines Ls1 and Ls2 are H level. When the alarm signal transmitted from the fire alarm 40 of the operation source is received by detecting the change to the L level, the control unit 45 controls the alarm unit 42 in the same manner as the fire alarm 40 of the operation source. The alarm is sounded and the display unit 43 is controlled to blink the display element. In the base unit 1, the voltages of the signal lines Ls1 to Ls4 of the signal line Ls are constantly monitored by the base unit transmission / reception unit 9, and the voltage levels of the first and second signal lines Ls1, Ls2 are H level, L When the alarm signal transmitted from the fire alarm 40 of the operation source is received by detecting that the level has been changed, the master control unit 3 controls the audio processing unit 5 from the speaker of the audio input / output unit 4 An alarm sound is generated and the image processing unit 7 is controlled to display a pictograph for notifying the occurrence of a fire on the screen of the display unit 4. As described in the first embodiment, in the fire alarm device 40 other than the operating source, the alarm sound and the flashing of the display element are continued until the alarm stop switch of the operation unit 44 is operated. When an operation signal accompanying the operation of the alarm stop switch is input, the control unit 45 controls the alarm unit 42 and the display unit 43 to stop the alarm sound and the display element from blinking.

  When the alarm stop button 13 of the base unit 1 is pressed and the alarm stop switch 8a is turned on, and an operation signal is input from the base unit operation unit 8 to the base unit control unit 3, the base unit control unit 3 5 and the video processing unit 7 are controlled to stop the sounding of the alarm sound and the display of the pictograph, and the base transceiver unit 9 is controlled to change the second signal line Ls2 from the L level to the H level, the third signal. An alarm stop signal is sent to the signal line Ls by changing the line Ls3 from the H level to the L level (time t = t2). In the fire alarm device 40 other than the operating source, when the alarm stop signal is received by the transmission / reception unit 46, the control unit 45 controls the alarm unit 42 and the display unit 43 to stop the sounding of the alarm sound and the flashing of the display element. However, in the fire alarm device 40 at the operation source, while it is determined that a fire has occurred based on the detection output of the detection unit 41, the control unit 45 generates an alarm sound even if an alarm stop signal is received. Continue ringing and blinking of the display element. Then, when the fire is extinguished and the control unit 45 does not determine that a fire has occurred, the fire alarm 40 at the operation source controls the alarm unit 42 and the display unit 43 to stop the alarm sound and the display element from blinking. At the same time, the transmission / reception unit 46 changes the first signal line Ls1 from the H level to the L level and the third signal line Ls3 from the L level to the H level to send a return signal to the signal line Ls (time t = T3). When this return signal is received, the alarm device 40 other than the activation source and the master unit 1 stop the alarm sound and return to normal operation in the same manner as when the alarm stop button 13 or the like is operated. To do.

  Further, if the transmission / reception unit 46 of any of the fire alarm devices 40 detects that the fourth signal line Ls4 has changed from the H level to the L level (time t = t4), the signal line Ls is disconnected. And the control unit 45 controls the transmission / reception unit 46 to change the first signal line Ls1 from the L level to the H level and the fourth signal line Ls4 from the H level to the L level. Is transmitted to the base unit 1. When the base unit transmission / reception unit 9 receives the disconnection signal, the base unit control unit 3 of the base unit 1 controls the video processing unit 7 to display a pictograph on the display unit 6 informing the occurrence of the disconnection. When the disconnection is recovered and the fourth signal line Ls4 changes from the L level to the H level, the control unit 45 of the fire alarm 40 that detects the disconnection controls the transmission / reception unit 46 to control the first signal line Ls1. Is changed from H level to L level, and the fourth signal line Ls4 is changed from L level to H level, respectively, so that the recovery of the disconnection is notified to the base unit 1 (time t = t5).

  As described above, in this embodiment, the alarm stop switch 8a (alarm stop button 13) of the base unit 1 is operated to stop the sound of the alarm sound from the fire alarm device 40 other than the operating source, as in the first embodiment. In addition to this, there is an advantage in that the disconnection of the signal line Ls can be detected and notified by the master unit 1.

(Embodiment 3)
The present embodiment is characterized by a signal transmission method between the master unit 1 and the fire alarm device 40. Other system configurations and basic configurations of the master unit 1, the door phone slave unit 20, and the fire alarm unit 40 are implemented. Since it is the same as that of the first embodiment, the same components are denoted by the same reference numerals, and illustration and description thereof are omitted.

  The base unit transmission / reception unit 9 of the base unit 1 and the transmission / reception unit 46 of the fire alarm 40 are connected by a two-wire signal line Ls as in the first embodiment, and the alarm is stopped by the line voltage (signal voltage). Various information such as signals are transmitted and received. For example, as shown in FIG. 7, the signal voltage during normal operation when the control unit 45 does not determine that a fire has occurred is 18 V, the signal voltage when the alarm signal is transmitted after determining that a fire has occurred is 12 V, The signal voltage when the alarm stop signal is sent to the fire alarm 40 becomes 8V, and becomes 0V when the wire breaks.

  Next, the operation when the fire alarm 40 determines that a fire has occurred will be described with reference to the time chart of FIG.

  In any fire alarm device 40, when the control unit 45 determines that a fire has occurred based on the detection output of the detection unit 41, the control unit 45 controls the alarm unit 42 to sound an alarm sound and display it. The display element is blinked by controlling the unit 43, and further the control unit 46 is controlled to reduce the signal voltage from 18V to 12V, thereby sending an alarm signal to the signal line Ls.

  On the other hand, in the other fire alarms 40, the line voltage of the signal line Ls is constantly monitored by the transmission / reception unit 46, and when the alarm signal transmitted from the fire alarm 40 of the operation source is received by the transmission / reception unit 46, the operation is performed. Similar to the original fire alarm 40, the control unit 45 controls the alarm unit 42 to sound an alarm sound and also controls the display unit 43 to blink the display element. Further, in the master unit 1, the line voltage of the signal line Ls is constantly monitored by the master unit transmission / reception unit 9, and when the master unit transmission / reception unit 9 receives the alarm signal transmitted from the fire alarm 40 of the operation source, The machine control unit 3 controls the audio processing unit 5 to sound an alarm sound from the speaker of the audio input / output unit 4 and controls the video processing unit 7 to display a pictograph for notifying the screen of the display unit 4 that a fire has occurred. Display. In the fire alarm device 40 other than the operating source, the alarm sound and the blinking of the display element are continued until the alarm stop switch of the operation unit 44 is operated, and the operation signal accompanying the operation of the alarm stop switch from the operation unit 44. Is input, the control unit 45 controls the alarm unit 42 and the display unit 43 to stop the alarm sound and the blinking of the display element.

  On the other hand, when the alarm stop button 13 of the master unit 1 is pressed and the alarm stop switch 8a is turned on and an operation signal is input from the master unit operation unit 8 to the master unit control unit 3, the master unit control unit 3 The processing unit 5 and the video processing unit 7 are controlled to stop the alarm sound and the pictogram display, and the master unit transmission / reception unit 9 is controlled to lower the signal voltage from 12V to 8V to the signal line Ls. Send an alarm stop signal. In the fire alarm device 40 other than the operating source, when the alarm stop signal is received by the transmission / reception unit 46, the control unit 45 controls the alarm unit 42 and the display unit 43 to stop the sounding of the alarm sound and the flashing of the display element. However, in the fire alarm device 40 at the operation source, while it is determined that a fire has occurred based on the detection output of the detection unit 41, the control unit 45 generates an alarm sound even if an alarm stop signal is received. Continue ringing and blinking of the display element. Then, when the fire is extinguished and the control unit 45 does not determine that a fire has occurred, the fire alarm 40 at the operation source controls the alarm unit 42 and the display unit 43 to stop the alarm sound and the display element from blinking. At the same time, the transmission / reception unit 46 returns the signal voltage from 8V to 18V, thereby sending a return signal to the signal line Ls. When this return signal is received, the alarm device 40 other than the activation source and the master unit 1 stop the alarm sound and return to normal operation in the same manner as when the alarm stop button 13 or the like is operated. To do.

  Further, if the transmission / reception unit 46 of any of the fire alarm devices 40 detects that the signal voltage of the signal line Ls has changed to 0V, it is determined that the signal line Ls is broken, and the control unit 45 By controlling the transmission / reception unit 46 to change the signal voltage to 0V, the disconnection signal is transmitted to the base unit 1. When the base unit transmission / reception unit 9 receives the disconnection signal, the base unit control unit 3 of the base unit 1 controls the video processing unit 7 to display a pictograph on the display unit 6 informing the occurrence of the disconnection. When the disconnection is restored and the signal voltage is restored to 18V, the control unit 45 of the fire alarm device 40 that detects the disconnection controls the transmission / reception unit 46 to change the signal voltage from 0V to 18V. Is notified of disconnection recovery.

  As described above, in this embodiment, the alarm stop switch 8a (alarm stop button 13) of the base unit 1 is operated to stop the sound of the alarm sound from the fire alarm device 40 other than the operating source, as in the first embodiment. In addition to the above, there is an advantage that the disconnection of the signal line Ls can be detected and notified by the base unit 1 as in the second embodiment.

1 is a system configuration diagram of Embodiment 1. FIG. It is a block diagram same as the above. It is a time chart for operation | movement description same as the above. It is a signal format in the same as above. 6 is a system configuration diagram of Embodiment 2. FIG. It is a time chart for operation | movement description same as the above. 10 is a time chart for explaining the operation of the third embodiment.

Explanation of symbols

1 Intercom master unit 13 Alarm stop button 20 Door phone slave unit 40 Fire alarm unit

Claims (1)

Door phone handset installed at the entrance outside the dwelling unit, interphone main unit installed inside the dwelling unit to communicate with the door phone sub unit, installed inside the dwelling unit, detects the occurrence of a fire and generates an alarm sound In an intercom system consisting of multiple fire alarms that emit,
A fire alarm is a detector that detects heat and smoke from a fire, an alarm unit that sounds an alarm sound, and sends an alarm signal to other fire alarms via a signal line and alarms from other fire alarms. When the transmitter / receiver that receives the signal and the detection output of the detector determines that a fire has occurred, or when the transmitter / receiver receives an alarm signal from another fire alarm, the alarm unit controls the alarm sound. A control unit that controls the transmission / reception unit to transmit an alarm signal when it is determined that a fire has occurred and a switch that can be operated manually, and an alarm sound to the control unit when the switch is operated And an operation unit for stopping the ringing of
The intercom master unit receives the alarm signal from the voice input / output unit that inputs and outputs the call voice, and the signal line from each fire alarm, and the alarm stop signal via the signal line to each fire alarm A main unit transmission / reception unit, a main unit control unit that outputs an alarm sound from the voice input / output unit when an alarm signal is received from any fire alarm in the main unit transmission / reception unit, and a manually operable alarm stop A master unit having a switch,
When the alarm stop switch of the base unit operation unit is operated, the base unit control unit of the intercom base unit stops the output of the alarm sound and controls the base unit transmission / reception unit to transmit an alarm stop signal,
The control unit of the fire alarm device controls the alarm unit to control the alarm sound if it is not judged that a fire has occurred when the transmitter / receiver receives the alarm stop signal while the alarm unit is sounding the alarm sound. The intercom system is characterized in that the ringing of the alarm is stopped and the alarm unit continues to beep if it is determined that a fire has occurred.

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