JP2007172101A - Fire alarm system for apartment house - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fire alarm system for an apartment house for reducing costs and for simplifying a construction work by eliminating the unnecessary for arranging between an emergency power source device and each housing information board all with wiring exclusive for emergency power source. <P>SOLUTION: This fire alarm system is provided with the housing information board of each residence to which at least a fire sensor is connected and a building receiver for transmitting a warning control signal to the housing information boards of adjacent residences when receiving a fire signal from any of the housing information board of each residence, to output fire warnings. The housing information boards operates by receiving power supply from the emergency power unit in the case of power failure. The emergency power unit is connected through an emergency power line to the building receiver, and the housing information board of each residence is connected through a multiple transmission line to the building receiver, and the emergency power unit is connected through the emergency power line and the multiple transmission line to the housing information board. Thus, the housing information board operates by receiving power supply from the emergency power unit in the case of power failure. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fire alarm system for apartment houses.

  Conventionally, in apartment houses and other apartment houses, various security sensors such as fire detectors, gas leak detectors, or security sensors are connected, and a housing information panel with security monitoring function and intercom call function is installed in each unit. Also installed in the control room, etc., is an alarm monitoring composite panel for apartments that is connected to the housing information panel via a multiplex transmission line and a telephone line, and monitors abnormalities of each dwelling unit, calls to each dwelling unit, and controls intercom calls. An integrated alarm monitoring system for apartment houses is used.

  Here, the complex residential alarm monitoring combined system is a combination of the residential residential monitoring call system and the residential residential fire alarm system. As a management room machine that receives various abnormal signals from the housing information board via the multiplex transmission line and notifies the abnormality, and calls to each dwelling unit through the multiplex transmission line, intercom call control When a fire signal is received via a multiplex transmission line from one of the housing information panels of each dwelling unit as a function and fire alarm system for an apartment, an alarm control signal is sent to the housing information panel of a neighboring dwelling unit via the multiplex transmission line. Is integrated with the function as a residential building receiver that outputs a fire alarm.

  In such a complex residential alarm monitoring system, each housing information panel is connected to the emergency power supply device by an emergency power line, and thus the housing information panel operates by receiving power supply from the emergency power supply device in the event of a power failure. (See, for example, Patent Document 1).

  In addition, it is not a complex housing alarm monitoring composite board as described above, but it is equipped with a management room unit and a housing ridge receiver. A separate system system installed in the system is still used (for example, see Patent Document 2).

  This separate system system has the demerit that the control room unit and the residential building receiver are separate units and the installation location becomes large, but the monitoring call system for apartment buildings and the fire alarm system for apartment buildings are separate. There are various merits such as cost reduction as a maker's product, splitting the introduction cost by shifting the introduction time of both systems, and retrofitting only the other system when one system is already installed. is there.

  In this separate system system, instead of multiple transmission lines in an alarm monitoring complex system for apartment buildings, it is used for an apartment telephone monitoring call system. It is used for the abnormality monitoring to receive the various abnormality signals of, and calling / monitoring control lines that can be used by the control room unit for calling to each dwelling unit and controlling the intercom call, and the fire information system for apartment houses. When the fire monitoring line that can receive the fire signal from the housing information board of each dwelling unit, and the housing wing receiver receives the fire signal, Separate dedicated lines are used for the alarm control line that can send out an alarm control signal to the housing information panel of the neighboring dwelling unit and output a fire alarm.

And even in such a separate system system, each housing information panel is connected to the emergency power supply device by an emergency power supply line, so that the housing information panel operates by receiving power supply from the emergency power supply device in the event of a power failure. Be able to.
Japanese Patent Laid-Open No. 11-161883 (FIG. 1) Japanese Patent Laid-Open No. 10-069589 (FIG. 6)

  The emergency power supply device is installed in, for example, a management room. For this reason, a system including a conventional fire alarm system for an apartment house (an alarm monitoring composite system for an apartment house and the separate system system) The length of the emergency power line connecting the housing information panel was long, and the construction work was complicated. In particular, the emergency power supply line is dedicated to the emergency power supply, and it is necessary to arrange the emergency power supply unit and each home information panel with the dedicated emergency power supply wiring, which complicates the system configuration. End up.

  The present invention has been made to solve the above-mentioned problems, and it is not necessary to arrange all of the emergency power supply device and each house information panel with wiring dedicated to the emergency power supply. It aims at providing the fire alarm system for apartment houses which can be made easy.

  This invention sends out an alarm control signal to a housing information board of a neighboring dwelling unit when a fire signal is received from at least one of the housing information board of each dwelling unit to which a fire detector is connected and the housing information panel of each dwelling unit. A residential building receiver for outputting a fire alarm, wherein the housing information panel is operated by receiving power supply from an emergency power supply in the event of a power failure. The building power receiver is connected with an emergency power supply line, the housing information panel of each dwelling unit and the residence building receiver are connected with a multiplex transmission line, and the emergency power supply device is connected via the emergency power supply line and the multiplex transmission line. The housing information board is connected to the house information board, and is operated by receiving power supply from the emergency power supply device in the event of a power failure.

  Further, the emergency power supply device constantly outputs a predetermined DC voltage for power supply during a power failure of the house information panel via the emergency power supply line, and the dwelling receiver receives the emergency power supply line. The predetermined DC voltage input via the multi-transmission line is always output via the multiplex transmission line, and the housing information panel inputs the predetermined DC voltage via the multiplex transmission line, and the predetermined DC The voltage is used as a power source, and the housing ridge receiver and the house information panel transmit and receive the fire signal and the alarm control signal between them, and these signals are used as transmission signals. Is transmitted and received through the multiple signal line.

  This invention sends out an alarm control signal to a housing information board of a neighboring dwelling unit when a fire signal is received from at least one of the housing information board of each dwelling unit to which a fire detector is connected and the housing information panel of each dwelling unit. A residential building receiver for outputting a fire alarm, wherein the housing information panel is operated by receiving power supply from an emergency power supply in the event of a power failure. The building power receiver is connected with an emergency power supply line, the housing information panel of each dwelling unit and the residence building receiver are connected with a multiplex transmission line, and the emergency power supply device is connected via the emergency power supply line and the multiplex transmission line. The house information board is connected to the house information board, and operates by receiving power supply from the emergency power supply device at the time of power failure. In this way, the emergency power supply dedicated wiring is limited to the emergency power supply line between the emergency power supply and the residential building receiver, and the multiplex transmission line is used for emergency power supply between the residential building receiver and the housing information board. Since it is used as wiring, it is not necessary to arrange all of the emergency power supply device and each house information panel with wiring dedicated to emergency power supply, and the construction work can be facilitated together with cost reduction. In particular, when used in a system that separates the monitoring call system for apartment buildings and the fire alarm system for apartment buildings, the conventional fire monitoring line, alarm control line, and emergency power line are used in one multiplex transmission line. it can.

  Further, according to the present invention, the emergency power supply device always outputs a predetermined DC voltage for power supply during a power failure of the house information panel via the emergency power supply line, and the dwelling receiver receives the emergency power supply. The predetermined DC voltage input via a power line is always output via the multiplex transmission line, and the house information panel inputs the predetermined DC voltage via the multiplex transmission line, and the power supply line A predetermined DC voltage is used as a power source, and when the housing receiver and the house information panel transmit and receive the fire signal and the alarm control signal between them, these signals are used as transmission signals, Since the superimposed signal obtained by superimposing the transmission signal on the predetermined DC voltage is transmitted / received via the multiplexed signal line, even if the multiplexed transmission line is used as an emergency power supply line, Between the housing information board It can exchange various transmission signals.

  Hereinafter, embodiments using the present invention will be described with reference to the drawings. FIG. 1 is a system diagram of an alarm monitoring composite system for apartment houses using the present invention, FIG. 2 is a block diagram of the alarm monitoring composite board for apartment houses used in FIG. 1, and FIG. 3 is housing information used in FIG. It is a block diagram about a board.

  First, the system system in this embodiment will be described. An alarm monitoring composite panel (hereinafter simply referred to as “composite panel”) 1 installed in a management room or the like is configured to connect a housing information panel 2 installed in each dwelling unit via a multiplex transmission line La and a communication line Lb. It is connected and has the function of monitoring the abnormalities of each dwelling unit, calling each dwelling unit, and controlling intercom calls.

  Each house information board 2 uses a doorphone unit 3 with a test terminal as a repeater, and connects a plurality of fire detectors S as security devices installed in the dwelling unit via a detector line Ld to detect a fire. A security monitoring function for detecting a notification signal of the device S and an intercom call function.

  The doorphone sub unit 3 is connected to the outdoor tester 4 and enables an outdoor test to test whether the fire detector S is normal through the sensor line Ld.

  This complex residential alarm monitoring combined system integrates a residential residential monitoring call system and a residential residential fire alarm system. That is, in the composite panel 1, as a monitoring call system for an apartment house, an abnormality monitor for receiving various abnormality signals from the house information panel 2 via the multiplex transmission line La and notifying the fact, and the multiplex transmission line La are used. The function as a management room unit that controls calls to each dwelling unit and intercom calls, and as a fire alarm system for apartments, receives fire signals from any of the housing information panels 2 of each dwelling unit via the multiplex transmission line La. In this case, an alarm control signal is sent to the housing information panel 2 of the neighboring dwelling unit via the multiplex transmission line La, and the function as a dwelling receiver that outputs a fire alarm is integrated.

  On the call line Lb, a call signal is transmitted and received between each house information board 2, the composite board 1, and the collective entrance machine 5 connected to the composite board 1. On the multiplex transmission line La, the multiplex transmission system is used. Control signals for intercom calls, various abnormal signals such as fire signals from each house information panel 2, and various transmission signals such as alarm control signals from the composite panel 1 are used to distinguish terminals such as the housing information panel 2 Various information is exchanged by sending and receiving addresses and the like.

  In such a complex housing alarm monitoring composite system, in this embodiment, the emergency power supply 6 that constantly outputs a predetermined DC voltage (for example, 24 VDC) for power supply during power failure of each housing information panel 2 is a composite panel. 1 and the emergency power supply line Lc. Then, the emergency power supply device 6 is connected to each housing information panel 2 via the emergency power supply line Lc and the multiplex transmission line La, and the housing information panel 2 receives power supply from the emergency power supply device 6 in the event of a power failure. It comes to work. In this way, the emergency power supply dedicated wiring is only the emergency power supply line Lc between the emergency power supply device 6 and the composite panel 1, and the multiplex transmission line La is connected to the emergency power supply between the composite panel 1 and the house information panel 2. Since it is used as a wiring for the operation, it is not necessary to arrange all the emergency power supply device 6 and each house information panel 2 with the wiring dedicated to the emergency power supply, and the construction work is facilitated together with the cost reduction. be able to.

  Here, the emergency power supply device 6 always outputs a predetermined DC voltage for power supply at the time of a power failure of the house information panel 2 through the emergency power supply line Lc, and the composite panel 1 transmits through the emergency power supply line Lc. The inputted predetermined DC voltage is always output via the multiplex transmission line La, and the house information panel 2 inputs the predetermined DC voltage via the multiplex transmission line La, and the predetermined DC voltage is output during a power failure. It is used as a power source.

  Furthermore, when the composite panel 1 and the house information panel 2 transmit and receive a fire signal and an alarm control signal between them, these signals are used as transmission signals as described above, and the transmission signal is further converted to the predetermined DC voltage. The superimposed signal is transmitted / received via the multiple signal line La, so that even if the multiple transmission line La is used as a wiring for emergency power, the composite panel 1 and the house information panel Various information can be exchanged between the two.

  In order to explain this, the composite board 1 and the house information board 2 will be described in detail. First, the composite panel 1 is as shown in FIG. 2, and is configured between a signal processing unit 10 configured by a CPU or the like and controlling each unit, and each house information panel 2 or the collective entrance machine 5 through the multiple transmission line La. A communication unit 12 for controlling a call via the communication line Lb by the handset H1 between the multiplex transmission unit 11 for transmitting and receiving various transmission signals, and each house information panel 2 or the collective entrance machine 5, various switches, The operation unit 13 composed of buttons and the like, the display window corresponding to each house information panel 2, the display unit 14 constituting the display means with a liquid crystal screen, various display lamps, etc., and the state of each house information panel 2 A storage unit 15 for storing, a print output unit 16 for printing out that a fire signal has been received, and a sound output unit 17 for outputting an alarm sound from the speaker SP1 as an alarm or a voice message are provided.

  Further, in the present embodiment, the composite board 1 includes a superimposing circuit 18 connected to the emergency power supply line Lc and the multiple transmission line La. The superimposing circuit 18 always outputs the predetermined DC voltage via the multiplex transmission line La, and outputs a superimposed signal in which various transmission signals are superimposed on the predetermined DC voltage when various transmission signals are transmitted. To do.

  Here, as shown in FIG. 4, the multiplex transmission unit 11 sets the voltage level (for example, 24V) of the predetermined DC voltage to a low level and a pulse signal that sets a higher voltage level (for example, 36V) to a high level. Since various transmission signals to be formed are transmitted and received, it is possible to distinguish the various transmission signals transmitted and received.

  The composite panel 1 includes a power supply unit (not shown) that supplies input commercial power to each unit, as well as a house information panel 2 described later, and a standby power supply (not shown) for when the commercial power supply fails. .

  The housing information panel 2 is as shown in FIG. 3, and is a multiplex transmission that transmits and receives various transmission signals between the signal processing unit 20 configured by a CPU and the like to control each unit and the composite panel 1 via the multiplex transmission line La. A call unit 22 for controlling a call via the call line Lb by the handset H2 between the unit 21 and the composite panel 1 or the collective entrance machine 5, a fire confirmation switch 23a, an alarm sound stop / recovery switch 23b. , Etc., a display unit 24 for displaying that the fire detector S has reported or that a fire has been confirmed, a storage unit 25 for storing its own address, etc., and a fire detector An alarm detection unit 26 that detects S alarms, a sound output unit 27 that outputs an alarm sound from the speaker SP2 as an alarm or voice message, and the like, and converts the input commercial power supply to a DC voltage (for example, 24 VDC). And always Parts and a power supply unit 28 supplies power to.

  Further, in this embodiment, the house information panel 2 is connected to the multiplex transmission line La, and separates the input superimposed signal and the like into various transmission signal components and emergency power supply components (predetermined DC voltage) to separate the signal and power supply. The power failure is monitored by the circuit 29, the normally-open contact 30 arranged on the electric circuit for supplying the separated emergency power supply component (predetermined DC voltage) to each part, and the output voltage drop of the power supply part 28. A power failure monitoring circuit 31 that switches the power supply to each unit from the power source unit 28 to the predetermined DC voltage by sometimes closing the contact 30 is provided. Due to the power failure monitoring circuit 31, the house information panel 2 is used only at the time of a power failure and is not always consumed even if the predetermined DC voltage is always inputted.

  Similarly to the multiplex transmission unit 11, the multiplex transmission unit 21 sets the voltage level (for example, 24V) of the predetermined DC voltage to a low level and a pulse signal that sets a higher voltage level (for example, 36V) to a high level. Since the various transmission signals to be formed are transmitted and received, the various transmission signals transmitted and received through the signal / power supply separation circuit 29 can be discriminated.

  In such a complex residential alarm monitoring combined system, the emergency power supply 6 always outputs a predetermined DC voltage for power supply during a power failure of the residential information panel 2 via the emergency power line Lc. 1 shows a multiplex transmission line La as a superposition signal of the predetermined DC voltage input via the emergency power line Lc with various transmission signals output from the multiplex transmission section 11 by the superposition circuit 18 as necessary. The housing information panel 2 separates the superimposed signal and the like input via the multiplex transmission line La into various transmission signal components and emergency power supply components (the predetermined DC voltage). Various transmission signal components are output to the multiplex transmission unit 21, and the emergency power supply component (the predetermined DC voltage) is output to the contact 30 side. Since the housing information panel 2 is always open with the contact 30, the predetermined DC voltage is not used for power supply to each part and is always supplied with power by the power supply unit 28. If it is determined that a power failure has occurred due to a decrease in the output voltage of the power supply unit 28, the power supply to each unit is switched from the power supply unit 28 to the predetermined DC voltage, and the power supply is performed using the predetermined DC voltage. Further, various transmission signals between the composite panel 1 and the house information panel 2 are received and discriminated by the multiplex transmission units 11 and 21, and necessary display and alarms are controlled. Note that the power capacity of the emergency power supply device 6 is selected according to the size of the building, that is, the number of installed house information panels 2.

  As an example of the transmission signal, the operation of the fire monitoring alarm process will be described. For example, a case where a fire occurs in the living room of room 601 will be described.

  When a fire occurs in the living room of room 601, the fire detector S sends an alarm signal to the detector line Ld. The house information panel 2 in the room 601 detects the alarm signal by the alarm detector 26, and the sound output unit 27 from the speaker SP2, for example, “The fire detector has been activated. Please confirm.” 1 fire alarm message is output.

  Next, if a resident does not operate the alarm sound stop / recovery switch 23b for a predetermined time (for example, 2 minutes), or if the fire confirmation switch 23a is operated during this time, the housing information of the room 601 is stored. The board 2 outputs a second fire alarm message from the speaker SP2 by the sound output unit 27, for example, "Fire is on fire. Fire has occurred. Please evacuate after confirming safety." Further, a fire signal (transmission signal) is output from the multiplex transmission unit 21. This fire signal is sent to the multiplex transmission line La via the signal / power source separation circuit 29.

  The composite panel 1 normally monitors whether there is an abnormality such as a disconnection in the housing information panel 2 of each dwelling by a polling operation by the multiplex transmission unit 11, but adds an address from one of the housing information panels 2 When a fire signal is received, based on the address, for a predetermined housing information panel 2 registered in advance, such as a housing information panel 2 of a neighboring unit such as a fire floor or a directly above floor, An alarm control signal (transmission signal) is transmitted to the multiplex transmission line La by the multiplex transmission unit 11 and a sound message such as “A fire has occurred in the room XX” is output from the speaker SP1 by the sound output unit 17. The alarm control signal (transmission signal) is superposed on the predetermined DC voltage by the superimposing circuit 18 and sent to the multiplex transmission line La.

  The housing information panel 2 of the predetermined dwelling unit such as a dwelling unit near the room 601 outputs the transmission signal component separated by the signal / power source separation circuit 29 to the multiplex transmission unit 21. When the multiplex transmission unit 21 receives an alarm control signal addressed to its own address, the sound output unit 27 receives a fire from the speaker SP2, for example, “Fire. Fire. A fire occurs in room XX (neighboring dwelling unit). “Please evacuate after confirming safety.” Is output.

  For intercom calls, a call signal designating a dwelling unit is sent from the composite board 1 via the multiplex transmission line La, and if the housing information board 2 receives this, the call information is sent via the call line Lb. Both intercom calls are possible.

  About the above, although the case where this invention is applied to the alarm monitoring composite system for apartment buildings is explained, the monitoring call system for apartment buildings and the fire alarm system for apartment buildings are also applied to separate systems. Can do. FIG. 5 shows a system diagram of the apartment house monitoring call system and the apartment house fire alarm system. As shown in the conventional example, the housing information board 2 and the management room unit 1b are connected via the call line Lb and the call / monitoring control line Le to constitute a monitoring call system for a shared house.

  On the other hand, in the fire alarm system for apartment houses, the housing information board 2 and the residential building receiver 1a are connected via the multiple transmission line La, and the residential building receiver 2 and the emergency power supply device 6 are connected to the emergency power line Lc. As in the case of the complex housing alarm monitoring composite system described above, the housing information panel 2 is operated by receiving power supply from the emergency power supply device 6 in the event of a power failure. . That is, the emergency power supply 6 always outputs the predetermined DC voltage for power supply during the power failure of the house information panel 2 through the emergency power supply line Lc, and the dwelling receiver 1a outputs the emergency power supply line Lc. The predetermined DC voltage input via the multi-transmission line La is constantly output via the multiplex transmission line La, and the housing information panel 2 inputs the predetermined DC voltage via the multiplex transmission line La, and the predetermined DC Use voltage as power source. Thereby, only the emergency power supply line 6 between the emergency power supply device 6 and the residential building receiver 1a is used as the wiring for the emergency power supply, and the multiplex transmission line La is provided between the residential building receiver 1a and the house information board 2. Is used as the wiring for emergency power supply, so it is not necessary to arrange the emergency power supply device 6 and each house information panel 2 with wiring dedicated to emergency power supply. Can be easy. In particular, conventional fire monitoring lines, alarm control lines, and emergency power lines can be used with one multiplex transmission line.

  Furthermore, when the housing ridge receiver 1a and the house information board 2 transmit and receive a fire signal and an alarm control signal between them, these signals are used as transmission signals, and the transmission signals are superimposed on the predetermined DC voltage. Since the superimposed signal is transmitted / received via the multiplex signal line La, even if the multiplex transmission line La is used as an emergency power supply wiring, the dwelling receiver 1a and the house information board 2 Various transmission signals can be exchanged between them.

  In addition, as a circuit block configuration of the residential building receiver 1a, the communication unit 12 and the handset H1 in the composite panel 1 of FIG. 2 are deleted, and the circuit block configuration of the housing information panel 2 is the housing information of FIG. In addition to the circuit block of the panel 2, a transmission / reception unit that is connected between the call / monitor control line Le and the signal processing unit 20 and transmits / receives various abnormal signals and call control signals is provided with a fire signal, an alarm control signal, etc. This configuration is provided separately from the multiplex transmission unit 21 that transmits and receives various transmission signals.

  In the said embodiment, although the emergency power supply device 6 was used for the power supply at the time of a power failure of the house information panel 2, it can also be further used for the power supply at the time of a power failure of the composite panel 1 or the residence building receiver 1a. That is, as the circuit block of the composite panel 1 or the residence building receiver 1a, the contact 30 of FIG. 3 is connected between the emergency power line Lc and the superimposing circuit 18, and the power supply unit 28 and the power failure monitoring circuit 31 of FIG. It is set as the structure provided. The power supply unit 28 normally supplies power, but when the power failure monitoring circuit 31 determines that a power failure occurs due to a decrease in the output voltage of the power supply unit 28, the contact 30 is closed to supply power to each unit from the power supply unit 28. It is also possible to switch to the emergency power supply device 6 (the predetermined DC voltage) to perform power supply with the predetermined DC voltage.

1 is a system diagram of an alarm monitoring composite system for apartment houses utilizing the present invention. It is a block diagram about the alarm monitoring composite board for apartment houses used for FIG. It is a block diagram about the housing information board used for FIG. It is explanatory drawing which shows a superimposition signal. FIG. 2 is a system diagram of the apartment house monitoring call system and the apartment house fire alarm system using the present invention as separate bodies.

Explanation of symbols

1 Alert monitoring composite panel for apartment house, 1a Residential building receiver, 1b Control room machine, 2 Housing information panel, 3 Door phone slave unit, 4 Outdoor tester, 5 Collective entrance machine, 6 Emergency power supply, 10 Signal processing unit, DESCRIPTION OF SYMBOLS 11 Multiple transmission part, 12 Call part, 13 Operation part, 14 Display part, 15 Storage part, 16 Print output part, 17 Sound output part, 18 Superimposition circuit, 20 Signal processing part, 21 Multiplex transmission part, 22 Call part, 23 Operation unit, 23a Fire confirmation switch, 23b Alarm sound stop / recovery switch, 24 display unit, 25 storage unit, 26 alarm detection unit, 27 sound output unit, 28 power supply unit, 29 signal / power supply separation circuit, 30 contacts, 31 Power failure monitoring circuit, S fire detector, La multiplex transmission line, Lb call line, Lc emergency power line, Ld sensor line, Le call / monitor control line, H1 handset, H2 handset , SP1 speaker, SP2 speaker.

Claims (2)

When a fire signal is received from at least the housing information panel of each dwelling unit connected to a fire detector and the housing information panel of each dwelling unit, a warning control signal is sent to the housing information panel of the neighboring dwelling unit to fire alarm In the fire alarm system for apartment houses, the housing information panel is operated by receiving power supply from the emergency power supply device at the time of a power failure.
The emergency power supply device and the dwelling unit receiver are connected by an emergency power line, the housing information panel of each dwelling unit and the dwelling unit receiver are connected by a multiple transmission line, and the emergency power line and the multiple transmission line are connected. The emergency power unit is connected to the housing information panel, and the residential information panel is operated by receiving power supply from the emergency power unit during a power failure. Fire alarm system. The emergency power supply device constantly outputs a predetermined DC voltage for power supply during a power failure of the house information panel via the emergency power line,
The dwelling receiver always outputs the predetermined DC voltage input via the emergency power line via the multiplex transmission line,
The house information panel inputs the predetermined DC voltage through the multiplex transmission line, and uses the predetermined DC voltage as a power source at the time of a power failure.
When transmitting and receiving the fire signal and the alarm control signal between them, the dwelling receiver and the housing information panel use these signals as transmission signals, and further superimpose the transmission signals on the predetermined DC voltage. The fire alarm system for apartment houses according to claim 1, wherein a superimposed signal is transmitted / received via the multiple signal line.

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