JP2010199685A - Security intercom system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a security intercom system which is good in workability while having a function of enabling a resident in a room wherein an intercom master unit is installed and a resident in a room wherein a fire alarm device is installed to have speech communication. <P>SOLUTION: The security intercom system includes the intercom master unit 1 installed in a house, and the fire alarm device 100 having a house fire alarm unit 11 which is installed in the house and transmits a fire occurrence signal to the intercom master unit 1 when detecting a fire breaking place and a terminal unit 12 for speech communication which is connected to the intercom master unit 1 through a second signal line Ls to have speech communication with the intercom master unit 1. The fire breaking signal is transmitted from the house fire alarm unit 11 to the intercom master unit 1 through the terminal unit 12 for speech communication and the second signal line Ls, and voice signals are transmitted between the intercom master unit 1 and terminal unit 12 for speech communication through the second signal line Ls. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a security intercom system.

  Conventionally, as shown in FIG. 6, an interphone master unit 1 ′ installed in a dwelling unit, and a door phone slave unit 2 ′ installed outside the dwelling unit and connected to the interphone master unit 1 ′ via a signal line L 1 ′, These are three residential fire alarms that are installed in a dwelling unit and connected to the intercom master unit 1 ′ via a two-wire signal line Ls ′ to output an alarm sound when a fire in the dwelling unit is detected. There has been proposed a security intercom system that includes a fire alarm device 11 ′, and when the fire alarm device 11 ′ detects a fire, the interphone master unit 1 ′ rings in conjunction with the fire alarm device 11 ′ (Patent Document 1). reference). Here, the door phone slave unit 2 ′ includes a camera unit (not shown) that captures a visitor and generates a video signal, and transmits the video signal to the intercom master unit 1 ′ via the signal line L1 ′. To do. Accordingly, the resident can make a call with the visitor while checking the video of the visitor with the interphone master unit 1 '. The signal line L1 ′ is used for transmitting and receiving audio signals, transmitting video signals from the doorphone slave unit 2 ′, and a display unit (not shown) provided in the doorphone slave unit 2 ′ when a fire occurs in the dwelling unit. 2) signal lines for transmitting an alarm display signal to the door phone slave unit 2 ′ for blinking.

  By the way, due to recent revisions to the Fire Service Law, it has become mandatory for newly built units to install fire alarms for houses. Along with this, it is expected that the demand for this type of security intercom system will increase.

  In the interphone system having the configuration shown in FIG. 6, a call can be made only between the interphone master unit 1 ′ and the door phone slave unit 2 ′. However, depending on the resident, the interphone master unit 1 ′ in the dwelling unit is installed. There is a case where it is desired to make a call possible between a room and each room where a fire alarm device 11 ′, which is a fire alarm for a house, is installed. In this case, it is conceivable to install a call terminal (not shown) in each room where the fire alarm device 11 'is provided.

JP 2008-219288 A

  However, when the call terminal is provided in each room where the fire alarm device 11 ′ is installed, a signal line for transmitting a fire occurrence signal from the fire alarm device 11 ′ to the interphone master device 1 ′ and the interphone master device 1 are provided. It was necessary to provide a separate signal line for transmitting and receiving voice signals to and from the call terminal provided in each room where the fire alarm device 11 was installed, and the workability was not good.

  The present invention has been made in view of the above-mentioned reasons, and its purpose is between a resident in a room where an interphone master unit is installed and a resident in a room where a fire alarm device is installed. It is possible to provide a security intercom system with good workability while having a function for making a call.

  According to a first aspect of the present invention, there is provided a door phone slave unit installed outside a dwelling unit, and a door phone slave unit installed in a dwelling unit via a first signal line and connected from the door phone slave unit via a first signal line. An intercom base unit having first sound output means for outputting sound based on a sound signal transmitted in the first place, and first sound collecting means for collecting sound input by a resident, and a dwelling unit installed in the dwelling unit A fire detection means for detecting the occurrence of a fire in the interior, and an alarm sound output means for outputting an alarm sound when the fire detection means detects a fire occurrence, and the fire detection means detects the occurrence of a fire A fire alarm unit for housing that transmits a fire occurrence signal to the intercom base unit, and a dweller who is connected to the intercom base unit via the second signal line and inputs sound to the first sound collecting means of the interphone base unit When intercom parent A telephone having a second sound output means for outputting a sound based on a sound signal transmitted from the telephone and a second sound collecting means for collecting the sound of the dweller and capable of making a call with an interphone master unit A fire alarm device comprising: a terminal unit for communication, wherein the terminal unit for communication has a signal line connection interface unit for transmitting the fire occurrence signal to the interphone master unit via the signal line, A fire occurrence signal is transmitted from the fire alarm unit to the interphone master unit via the call terminal unit and the second signal line, and voice signals are transmitted and received between the interphone master unit and the call terminal unit. This is performed through the second signal line.

  According to the present invention, audio signals are transmitted and received between the intercom base unit and the call terminal unit via the second signal line, and a fire occurrence signal from the residential fire alarm unit to the intercom base unit is transmitted. Since transmission is performed via the call terminal unit and the second signal line, the signal line for transmitting the fire occurrence signal from the residential fire alarm unit to the interphone master unit, the interphone master unit, and the call terminal Because there is no need to provide a separate signal line for sending and receiving audio signals to and from the unit, the dweller in the room where the intercom master unit is installed and the unit in the room where the residential fire alarm unit is installed Workability can be improved while having a function of making a call with a person.

  According to a second aspect of the present invention, in the first aspect of the present invention, the fire alarm unit for a house and the terminal unit for a call are provided at least two, and the interphone main unit and all the terminal units for a call It is possible to make a call between the intercom base unit and all the call terminal units by forming a call path including a second signal line.

  According to the present invention, when a call is made between the intercom base unit and all the call terminal units, a call is made with a dweller in a room where the call terminal unit is installed. Since it is not necessary for the person to know which room among the rooms where the call terminal unit is installed, the usability can be improved.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the residential fire alarm unit includes a call terminal connection interface unit including a plug blade for connection to the call terminal unit. The call terminal unit includes a fire alarm unit connection interface unit including a blade receiving terminal into which the plug blade of the call terminal unit connection interface unit is inserted, and the residential fire alarm unit includes a call unit The plug blade of the terminal connection interface unit is connected to the call terminal unit by being inserted into the blade receiving terminal of the fire alarm unit connection interface unit, and the residential fire alarm unit is detachable from the call terminal unit It is attached to.

  According to the present invention, the residential fire alarm unit includes a call terminal connection interface unit including a plug blade for connection to the call terminal unit, and the call terminal unit includes the call terminal. A fire alarm unit connection interface unit having a blade receiving terminal into which the plug blade of the unit connection interface unit is inserted. The fire alarm unit for the house has a fire alarm when the plug blade of the communication terminal unit connection interface unit The housing fire alarm unit is connected to the call terminal unit in a form inserted into the blade receiving terminal of the unit connection interface unit, and the residential fire alarm unit is detachably attached to the call terminal unit. In the case where only the fire alarm device is broken, it is not necessary to replace the entire fire alarm device, so that the maintenance of the fire alarm device is facilitated. Further, when only the residential fire alarm unit is broken, only the residential fire alarm unit needs to be replaced, so that the cost of parts necessary for maintenance can be suppressed.

  According to the first aspect of the present invention, audio signals are transmitted and received between the intercom base unit and the communication terminal unit via the second signal line, and a fire from the fire alarm unit for housing to the interphone base unit is performed. Since the generation signal is transmitted via the telephone terminal unit and the second signal line, there is no need to provide a signal line for transmitting and receiving an audio signal and a signal line for transmitting a fire occurrence signal. To improve the workability while having the function of making a call between the dweller in the room where the intercom master unit is installed and the dweller in the room where the fire alarm unit for houses is installed Can do.

It is a schematic block diagram of the security intercom system of embodiment. It is a block diagram of the intercom main unit 1 used for a security intercom system same as the above. The fire alarm device used for a security intercom system same as the above is shown, (a) is an exploded perspective view, (b) is a perspective view. It is a block diagram of the fire alarm device used for a security intercom system same as the above. It is a figure which shows the operation | movement flow of a security intercom system same as the above. It is a schematic block diagram of the security intercom system of a prior art example.

  Hereinafter, an embodiment will be described with reference to FIG.

  The security intercom system according to the embodiment is installed outside the dwelling unit and is connected to the doorphone slave unit 2 where a visitor inputs voice and the doorphone cordless unit 2 installed in a plurality of rooms inside the dwelling unit via the first signal line L1. The intercom base unit 1 that has been set up and a plurality of alarms that sound when a fire is generated and a sound that informs the occurrence of a fire is output when a fire is detected in the dwelling unit. In the illustrated example, there are three fire alarm units 11 for residential use and a plurality of (three in the illustrated example) that are connected to the intercom base unit 1 through the second signal line Ls and can communicate with each other. ) Of the call terminal unit 12. Here, the fire alarm device 100 is composed of the residential fire alarm unit 11 and the call terminal unit 12. The first signal line L1 transmits and receives audio signals and video signals described later between the intercom master unit 1 and the door phone slave unit 2, and is provided in the door phone slave unit 2 when a fire occurs in the dwelling unit. It consists of a two-wire signal line for transmitting an alarm display signal to the doorphone slave unit 2 in order to blink a display unit (not shown). Each call terminal unit 12 has a signal line connection interface unit (not shown) provided with a terminal unit (not shown) including a pair of screwed terminal units for connecting the two-wire second signal line Ls. Signal line connection I / F section) 12g. In each call terminal unit 12, the terminal units of the signal line connection I / F unit 12g are connected to each other by a two-wire second signal line Ls.

  Also, interphone master unit 10 is connected to interphone sub-master unit 10 installed in a room different from the room in which interphone master unit 1 is installed and capable of making a call with door phone slave unit 2 via third signal line L2. Has been. Note that a call can also be made between the interphone sub-master device 10 and each call terminal unit 12.

  As shown in FIG. 2, the intercom master unit 1 includes a first communication processing unit 1 c that transmits and receives audio signals to and from the door phone slave unit 2, and a fire that will be described later transmitted from the residential fire alarm unit 11. A second communication processing unit 1i that receives a signal and transmits / receives a voice signal to / from the call terminal unit 12, and a first sound output that outputs a voice based on the voice signal transmitted from the doorphone slave unit 2 A first speaker 1d which is a means, a first microphone 1e which is a first sound collecting means for collecting sounds input by the dweller to the interphone master unit 1, an interphone master unit 1 and a door phone slave unit 2, A communication processing unit 1h for switching the communication direction between the communication terminals, a third communication processing unit 1l for transmitting and receiving audio signals and fire alarm signals to and from the interphone sub-master unit 10, and a first communication processing unit 1c, second communication processing unit 1 , And a signal processing unit 1a including a CPU which transmits and receives audio signals or fire signals between each third communication processing part 1l and call processing unit 1h. Further, the intercom base unit 1 is provided with a call operation button 1k that is connected to the signal processing unit 1a so as to enable a call between the interphone base unit 1 and the call terminal unit 12. By pressing the call operation button 1k, it is possible to maintain a state in which a call can be made between the intercom base unit 1 and the call terminal unit 12.

  The interphone base unit 1 is provided with, for example, a first call path selection operation button 1j for selecting a call terminal unit 12 connected to the signal processing unit 1a and capable of making a call with the interphone base unit 1. By pressing the first call path selection operation button 1j a plurality of times, the call terminal unit 12 that can make a call with the intercom base unit 1 may be designated. Here, the designation of the call terminal unit 12 that enables communication with the interphone master unit 1 is performed, for example, by assigning an address to each of the plurality of call terminal units 12 and using the first call path selection operation button. Depending on the number of times of pressing 1j, the address designated by the interphone master unit 1 may be changed, and the designation of the call terminal unit 12 that can make a call with the interphone master unit 1 may be changed. In addition, the interphone base unit 1 is provided with a second call path selection operation button 1m for enabling a call between the interphone base unit 1 and all the call terminal units 12, and for the second call path selection. By pressing the operation button 1j, a call may be made between the intercom base unit 1 and all the call terminal units 12. Further, the intercom base unit 1 is provided with a call end operation button 1n for ending a state in which a call can be made between the interphone base unit 1 and all the call terminal units 12, and the call end operation button 1n is provided. By pressing the button, the state in which a call can be made between the intercom base unit 1 and all the call terminal units 12 may be terminated. Here, when the first call path selection operation button 1j is pressed, the designated call terminal unit 12 sounds a ringing tone from the second speaker 12d. On the other hand, when the second call path selection operation button 1m is pressed, all the call terminal units 12 sound a ringing tone from the second speaker 12d.

  The doorphone slave unit 2 receives a voice signal transmitted from the intercom master unit 1 via the first signal line L1 and outputs it as a voice, and a visitor sends the voice to the doorphone slave unit 2. A microphone (not shown) for inputting to the above and blinking when receiving a warning display signal transmitted from the intercom base unit 1 via the first signal line L1 when a fire occurs in the dwelling unit And a display unit. Further, the doorphone slave unit 2 includes a camera unit (not shown) that captures a visitor and generates a video signal, and transmits the video signal to the intercom base unit 1 via the first signal line L1. . Therefore, the resident can make a call with the visitor while checking the video of the visitor with the intercom master unit 1.

  As shown in FIG. 3 (a), the residential fire alarm unit 11 includes a casing 111a whose outer shape is formed in a disk shape, and is electrically connected to the call terminal unit 12 on one surface of the construction surface side. A pair of plug blades 111f for mechanical connection protrudes, and a protruding portion 111c having a built-in first alarm sound output speaker 11d is formed on the other surface side opposite to the construction surface side. ing. A smoke introduction hole 111b for introducing smoke into the house fire alarm unit 11 is formed on the side surface of the protruding portion 111c. Here, the plug blade 111f is a part of a call terminal connection interface unit (call terminal connection I / F unit) 11f for outputting a fire signal from the fire alarm unit 11 for a house to the call terminal unit 12. Part.

  Here, the residential fire alarm unit 11 detects the smoke introduced into the residential fire alarm unit 11 from the smoke introduction hole 111b (see FIG. 3A) as shown in FIG. A smoke detection unit 11b which is a fire detection means for detecting the occurrence of a fire in the vehicle, a first alarm sound output speaker 11d which is a first alarm sound output means for outputting an alarm sound for notifying the occurrence of a fire, When the smoke detector 11b detects the occurrence of a fire, the first alarm sound for causing the first alarm sound output speaker 11d to emit an alarm sound for notifying the occurrence of a fire and outputting a sound for notifying the occurrence of a fire An acoustic processing unit 11c that controls the output speaker 11d, a display unit 11e that includes an LED that blinks when the smoke detection unit 11b detects the occurrence of a fire, the call terminal unit connection I / F unit 11f, and smoke Detection unit 11b The display unit 11e is blinked and the sound processing unit 11c is controlled to sound an alarm sound for notifying the occurrence of a fire from the first alarm sound output speaker 11d, and a fire occurrence signal is generated to generate a call terminal. 1st control part 11a which consists of CPU which outputs to the part connection I / F part 11f. In addition, the residential fire alarm unit 11 is provided with a push button 11g connected to the first control unit 11a, and the first alarm sound output speaker 11d sounds an alarm sound and notifies the occurrence of a fire. When the dweller depresses the push button 11g in a situation where a sound is output, the first control unit 11a controls the acoustic processing unit 11c to generate an alarm sound from the first alarm sound output speaker 11d. Stops the output of sound that alerts the occurrence of fire and the occurrence of fire.

  As shown in FIG. 3A, the communication terminal unit 12 is formed in a disk shape whose outer shape is larger in plan view than the residential fire alarm unit 11, and one surface side in the thickness direction is a ceiling construction surface. A pair of arc-shaped plug blade insertion holes 112f into which the pair of plug blades 111f of the residential fire alarm unit 11 are inserted on the other surface side in the thickness direction are formed. In addition, a fire alarm unit connection interface for receiving a fire occurrence signal generated by the fire alarm unit 11 for a house by connecting a plug blade 111f inserted into the plug blade insertion hole 112f inside the call terminal unit 12 A blade receiving terminal (not shown) is provided which constitutes a part of the section (fire alarm section connection I / F section) 12f and to which the plug blade 111f inserted from the plug blade insertion hole 112f is connected. The residential fire alarm unit 11 is attached to the other surface side of the call terminal unit 12 in such a manner that the plug blade 111f is inserted into the plug blade insertion hole 112f. Here, in the state where the residential fire alarm unit 11 is attached on the other surface side of the call terminal unit 12 (see FIG. 3B), the second speaker 12d is placed at a location that does not overlap with the residential fire alarm unit 11. A second microphone 12e is provided. The call terminal portion 12 is provided with a screw insertion portion (not shown) through which a mounting screw (not shown) can be inserted from the other surface side to the one surface side. The part 12 is screwed by the mounting screw in such a manner that the one surface side is in contact with the construction surface of the ceiling material.

  Here, as shown in FIG. 4, the call terminal unit 12 transmits the fire occurrence signal received from the fire alarm unit connection I / F unit 12f and the house fire alarm unit 11 to the interphone master unit 1. A communication processing unit 12c that transmits and receives audio signals to and from the intercom base unit 1, and a fire signal obtained from the residential fire alarm unit 11 via the fire alarm unit connection I / F unit 12f is a second signal line. An abnormality occurrence signal transmitted from the intercom base unit 1 through the second signal line Ls and transmitted from the interphone base unit 1 through Ls and from another call terminal unit 12 through the second signal line Ls. A communication line 12c that receives a fire signal from a signal line connection I / F unit 12g that receives a fire occurrence signal to be transmitted, a fire alarm signal from a fire alarm unit connection I / F unit 12f, and a later-described call processing unit 12h; Signal line And a second controller 12a including a CPU to be transmitted to the intercom master unit 1 via the connection I / F unit 12g and the second signal line Ls.

  The call terminal unit 12 outputs a sound based on a sound signal transmitted from the intercom base unit 1 via the second signal line Ls when a resident inputs a sound to the interphone base unit 1. The second speaker 12d, which is the second sound output means, the second microphone 12e, which is the second sound collecting means for collecting the sound input by the resident to the call terminal unit 12, and the interphone master unit 1. The call direction based on the audio signal transmitted from the second signal line Ls, the signal line connection I / F unit 12g, the communication processing unit 12c, and the second control unit 12a and the audio signal from the second microphone 12e. And a call processing unit 12h for performing switching and the like. Here, the signal line connection I / F portion 12g is provided with a terminal portion (not shown) including a screwed terminal portion, and the two-wire second signal line Ls is connected to the terminal portion. The It should be noted that the signal line connection I / F portion 12g of the call terminal portion 12 is provided with a pair of hooking blades (not shown) and can be attached with a conventional residential fire alarm portion (not shown). You may make it attach to a ceiling (not shown). In this case, the hooking blade of the calling terminal unit 12 is inserted into a pair of arcuate hooking blade insertion ports (not shown) provided in the hooking ceiling, and the calling terminal unit 12 is inserted into the hooking plug. By rotating the blade insertion opening in the arc direction, the hooking blade is hooked on the hooking ceiling. In this case, when attaching the telephone terminal unit 12 to the ceiling material, it is not necessary to use the mounting screw to fix the work, so that workability is improved.

  Further, the residential fire alarm unit 11 is configured such that the plug blade 111f of the communication terminal unit connection I / F unit 11f is inserted into the blade receiving terminal of the fire alarm unit connection I / F unit 12f. The fire alarm unit 11 for a house is detachably attached to the call terminal unit 12. Therefore, when only the fire alarm unit 11 for houses is broken, it is not necessary to replace the entire fire alarm device 100, so that the maintenance of the fire alarm device 100 is facilitated. In addition, when only the residential fire alarm unit 11 is broken, only the residential fire alarm unit 11 needs to be replaced, so that the cost of parts necessary for maintenance can be suppressed.

  Next, the operation of the security intercom system according to the embodiment will be described with reference to FIG.

  First, in the standby state (S0) of the security intercom system in which no fire has occurred in the dwelling unit and no call is made between the interphone master unit 1 and the door phone slave unit 2, the interphone master unit 1 is provided. By pressing the given first call path selection operation button 1j a plurality of times, one call terminal unit 12 that can make a call with the intercom base unit 1 is designated and called, or the second By pressing the call path selection operation button 1m, it is selected whether to call all the call terminal units 12 (S11).

  When the first call path selection operation button 1j is pressed to select and call one designated call terminal unit 12, the designated call terminal unit 12 is connected to the second speaker 12d. A ringing tone is generated (S12).

  Thereafter, a call can be made between the intercom base unit 1 and the designated call terminal unit 12 (S13).

  Here, in the intercom base unit 1, when the call end operation button 1n is pressed (S14), a state in which a call can be made between the intercom base unit 1 and the designated call terminal unit 12 ends (S16). . Further, when the call end operation button 1n is not pressed in the intercom base unit 1 and a predetermined time (for example, 5 minutes) has passed (S15), the call-ready state is also ended (S15). S16).

  On the other hand, when the second call path selection operation button 1m is pressed to call all the call terminal units 12 (S21), all the call terminal units 12 are connected to the second speaker 12d. A ringing tone is generated (S22).

  Thereafter, a call can be made between the intercom base unit 1 and all the call terminal units 12 (S23).

  Here, in the intercom base unit 1, when the call end operation button 1n is pressed (S24), the state where the intercom base unit 1 and all of the call terminal units 12 can talk is terminated (S26). . In addition, when the call end operation button 1n is not pressed on the intercom base unit 1 and a predetermined time (for example, 5 minutes) has elapsed (S25), the call-ready state is also ended (S25). S26).

  By the way, in embodiment, transmission / reception of the audio | voice signal between the intercom main unit 1 and the terminal unit 12 for a call is performed via the 2nd signal wire | line Ls, and the fire alarm part 11 for houses is connected to the interphone main unit 1. The fire occurrence signal is transmitted through the call terminal unit 12 and the second signal line Ls.

  Accordingly, a signal line (not shown) for transmitting and receiving audio signals between the interphone master unit 1 and the call terminal unit 11 and a fire occurrence signal from the house fire alarm unit 11 to the interphone master unit 1 are transmitted. Since it is not necessary to provide a separate signal line (not shown) for the purpose, workability can be improved.

  Further, in the security intercom system of the embodiment, a communication path is formed between the interphone master unit 1 and all the call terminal units 12, thereby making a call with a resident in the room where the call terminal unit 12 is installed. In this case, it is not necessary for the resident to know which room among the rooms where the call terminal unit 12 is installed, so that the usability can be improved.

1 Interphone main unit 1d First speaker (first sound output means)
1e First microphone (first sound collecting means)
2 Door phone slave unit 11 Residential fire alarm unit 11d Alarm sound output speaker 11f Call terminal unit connection interface unit 12 Call terminal unit 12d Second speaker (second sound output means)
12e Second microphone (second sound collecting means)
12f Fire alarm part connection interface part 12g Signal line connection interface part 111f Plug blade L1 First signal line Ls Second signal line

Claims (3)

  An intercom unit installed outside the dwelling unit, and an audio signal transmitted from the intercom unit via the first signal line while being connected to the intercom unit installed inside the dwelling unit via the first signal line. An intercom base unit having first sound output means for outputting sound based on the first sound collecting means for collecting sound input by a resident, and fire in the dwelling unit. Fire detection means to detect, and an alarm sound output means for outputting an alarm sound when the fire detection means detects the occurrence of a fire, and when the fire detection means detects a fire occurrence, a fire occurs to the intercom master unit A fire alarm unit for a house that transmits a signal and the interphone master when connected to the interphone master via the second signal line and a resident inputs a sound to the first sound collecting means of the interphone master. Transmitted sound A second sound output means for outputting sound based on the signal, and a second terminal for collecting speech of the dweller's voice, and a communication terminal unit capable of making a call with the interphone master unit. The call terminal unit has a signal line connection interface unit for transmitting the fire occurrence signal to the interphone main unit via the signal line, and the fire alarm unit for housing is used as an interphone. The transmission of the fire occurrence signal to the base unit is performed via the call terminal unit and the second signal line, and the transmission and reception of the audio signal between the intercom base unit and the call terminal unit is the second signal line. Security intercom system characterized by being performed via   By providing at least two each of the residential fire alarm unit and the call terminal unit, and forming a communication path composed of the second signal line between the intercom master and all the call terminal units The security intercom system according to claim 1, wherein a call can be made between the intercom base unit and all the call terminal units. The residential fire alarm unit includes a call terminal connection interface unit provided with a plug blade for connection to the call terminal unit, and the call terminal unit includes: A fire alarm unit connection interface unit having a blade receiving terminal into which the plug blade is inserted, wherein the fire alarm unit for a house is a blade of a fire alarm unit connection interface unit. 3. The housing fire alarm unit is detachably attached to the call terminal unit by being connected to the call terminal unit in a form inserted into a receiving terminal. The security intercom system described.

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