JPH07123162A - Interphone system for elevator and its inspection method - Google Patents

Abstract

PURPOSE:To provide an interphone system for an elevator in which the inspection is surely conducted without a maintenance personnel visiting its installed location. CONSTITUTION:An in-cage interphone 20 of an elevator is provided with an interphone control circuit 26 and a recording/reproduction section 30 recording/ reproducing an inspection tone from an external remote control section 40, the recording/reproducing section 30 records the inspection tone sent from the remote control section 40 and when the interphone control circuit 26 calls the remote control section 40, the section 30 reproduces the inspection signal and sends it to the remote control section 40. The remote control section 40 compares the sent inspection signal with the received and reproduced inspection tone to inspect the interphone system. Thus, one inspection personnel using the remote control section conducts the in-cage interphone call inspection from the remote control section, the call inspection of the remote control section from the in-cage interphone 20 and the talking state inspection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection means for an intercom system of an elevator.

[0002]

2. Description of the Related Art Generally, an intercom system for an elevator is a system for making a call between the inside and outside of an elevator car in an emergency. An intercom inside the car is inside the elevator car, and an external intercom outside the elevator. Is provided.

This will be described with reference to FIG. 10 in the figure
Is an elevator car (hereinafter simply referred to as a car), 20 is an intercom in the elevator car, 12 is an external intercom, 22 is an intercom speaker for outputting the sound transmitted from the external intercom to the inside of the car 10 during a call,
Reference numeral 24 is an intercom microphone for collecting the sound in the car 10 during a call.

In the above intercom system, when the user presses the external intercom call button 20a provided in the car 10, the external intercom 12 is called, and a call between the intercom 20 in the car and the external intercom 12 becomes possible. . Further, when the external intercom 12 does not respond to the call from within the car 10, the intercom 20 in the car automatically calls a remote management unit (not shown) different from the external intercom to talk with the remote management unit. It is possible.

[0005] In such an intercom system for an elevator, if it is not operated when necessary, an accident involving human life will be caused, so the intercom system is regularly inspected.

At least two inspectors 16a and 16b perform the inspection of the conventional intercom system.

That is, first, the car inspector 16a calls the external intercom 12 by pressing the external intercom calling button 20a. Next, the external inspector 16b operates the called external intercom 12, and the in-car inspector 16b
Make a call with a and check the call status at this time. If the call state is good, it is determined that the elevator intercom system is normal.

[0008]

However, in an elevator having a conventional intercom system,
At the time of inspection, two inspectors 16a, 16b
It cannot be inspected unless it is inside and outside). Therefore, if two inspectors cannot be secured at the same time, the opportunity must be re-inspected, and the efficiency of the inspection is poor and there is a high possibility that an inspection omission will occur. If an inspection omission occurs and the interval between regular inspections becomes long, the elevator intercom may not operate when necessary, which may cause a serious accident related to human life.

The present invention has been made in order to solve these problems, and an object of the present invention is to provide an intercom system for an elevator, which enables reliable inspections even if an inspector does not go to the site. .

[0010]

To achieve the above object, an elevator intercom system according to the present invention includes an elevator car intercom and remote operation means for remotely operating the in-car intercom. The intercom system in the car, wherein the intercom in the car records and reproduces the inspection signal transmitted from the remote operation means, and the recording / reproduction means when the inspection signal is transmitted from the remote operation means. Interphone control means for causing the reproduction means to record the inspection signal, reproducing the inspection signal recorded in the recording / reproduction means when the remote operation means is called, and transmitting the reproduced inspection signal to the remote operation part. , Are included.

Further, the intercom in the elevator car has an intercom speaker and an intercom microphone, and the recording / reproducing means is transmitted from the remote control means, is output from the intercom speaker, and is collected by the intercom microphone. It is characterized by recording the inspection signal.

Further, the intercom system of the elevator according to the present invention, that is, the intercom control means, the intercom speaker, the intercom microphone, and the inspection signal are recorded / recorded.
In an inspection method of an intercom system for an elevator, comprising: an inter-car intercom in an elevator having a recording / reproducing means for reproducing; and a remote operation means remotely operating the intercom in the car, wherein the remote operation means is the intercom control means. The inspection signal of the intercom system is transmitted to, the intercom control means causes the recording / reproducing means to record the inspection signal output from the interphone speaker and collected by the interphone microphone, and after the recording of the inspection signal, The intercom control means calls the remote control means,
It is characterized in that the inspection signal recorded in the reproducing means is reproduced and transmitted to the remote controlling means.

[0013]

According to the intercom system for an elevator according to the present invention, the intercom in the elevator car is provided with a recording / reproducing unit for recording and reproducing the inspection signal from the remote operation unit, and an intercom control circuit for controlling this. The inspection signal transmitted from the remote operation unit is recorded in the recording / reproducing unit, and when the intercom control circuit calls the remote operation unit, the inspection signal is reproduced and transmitted to the remote operation unit.

Therefore, one inspector can perform a call inspection of the intercom in the car from the remote operation unit and a call inspection of the remote operation unit from the intercom in the car without going to the site. The efficiency of inspection can be improved and the omission of inspection can be prevented.

Further, the inspection signal transmitted from the remote control unit is output from the intercom speaker to the inside of the car, collected by the intercom microphone, and recorded in the recording / reproducing unit.
When the intercom control unit calls the remote operation unit, this inspection signal is reproduced and transmitted to the remote operation unit. If this reproduction inspection signal and the first inspection signal are compared, the intercom speaker and the intercom will be operated at the same time as the call inspection. The microphone can be inspected.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a conceptual diagram showing an elevator according to an embodiment of the present invention.

In the figure, 10 is an elevator car, and 20 is a car.
An intercom in the car, 20a is an external intercom call button, 22 is an intercom speaker that outputs the sound transmitted from the outside into the car 10 during a call and inspection, 2
Reference numeral 4 denotes an intercom microphone that collects the sound in the car 10 during a call and inspection, and 12 denotes an external intercom for making a call with the intercom 20 in the car.

Reference numeral 40 denotes a remote control unit which remotely controls the intercom 20 inside the car and the external intercom 12 via the public line 18 which is an external communication means. 42 is a remote control speaker, 44 is a remote control microphone, and 16 is an inspector of the intercom system of the elevator.

Next, the construction of the intercom system for the elevator shown in FIG. 1 will be described with reference to FIG. The same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. The intercom 20 in the car includes an intercom speaker 22, an intercom microphone 24, an external intercom call button 20a, and an intercom inspection processing section 20b.
It consists of and. The intercom inspection processing unit 20b includes an intercom control circuit 26 and a recording (playback) / playback unit 30 that records and plays back an inspection signal (inspection sound).
And an intercom modem 28.

The remote control section 40 inputs the remote control circuit 48, the remote control modem 50, the remote control speaker 42, the remote control microphone 44, and the calling number of the intercom 20 in the car. The numeric keypad 46 of FIG. The intercom 20 in the car and the remote control section 40 are connected by the public line 18 between the intercom modem 28 and the remote control modem 50, and communication between them is possible.

In the above intercom system, when the user of the elevator wants to contact the outside from the inside of the car 10 in an emergency, the user presses the external intercom call button 20a provided in the car 10. At this time, if the external intercom 12 is in a normal state, the intercom 20 in the car and the external intercom 12 are in a call state, and the user can contact the operator of the external intercom 12 through the intercom microphone 24 and the intercom speaker 22. it can.

The external intercom call button 20 is also provided.
When the external intercom 12 is out of the hook or is out of order and cannot be called when a is pressed, the intercom control circuit 26 automatically causes the remote control unit 40, which also functions as a conventional remote management unit, to operate the public remote control unit 40. A call is made via the line 18 to bring the intercom 20 in the car and the remote control unit 40 into a call state. Therefore, the user can contact the operator of the remote control unit 40.

Next, the inspection procedure of the intercom system for the elevator according to this embodiment will be described with reference to FIGS. 1, 2 and 3.
Will be explained.

First, the inspector 16 uses the ten-key pad 46 of the remote control unit 40 to input the telephone number of the intercom 20 in the elevator car to be inspected. Then, the remote control circuit 48 transmits a calling signal of the intercom 20 in the car through the remote control modem 50 (S1).

The calling signal is transmitted to the intercom 20 in the car through the public line 18, and the intercom control circuit 26 receives the calling signal through the intercom modem 28 (S2).

Next, the intercom control circuit 26 confirms whether or not the external intercom 12 is disengaged from the hook or malfunctioning (normal) (S3). If there is a problem with the external intercom 12 and it is not possible to communicate with the intercom 20 in the car, the intercom control circuit 2
6 notifies the remote operation unit 40 of this (S4), finishes the inspection once, restores the external intercom 12 to a normal state, and then starts the inspection again.

If the external intercom 12 is in a normal state, the intercom control circuit 26 informs the remote control section 40 that the preparation for inspection is completed through the intercom modem 28 and the public line 18 by voice or other signals. . This signal is output from the remote control speaker 42 via the remote control modem 50 or displayed on a display not shown or the like to notify the inspector 16 of the intercom system.

At the same time, in the in-car intercom 20, the intercom control circuit 26 pushes the external intercom calling button 20a, that is, the in-car intercom 20 calls the external intercom 12. Further, the remote control unit microphone 44 and the intercom speaker 22 are brought into a call state via the public line 18 (S5).

At the same time, the intercom control circuit 26 activates the recording / playback unit 30 to prepare for recording (S).
6).

After the preparation for the inspection is completed, the inspector 16 of the elevator intercom emits an inspection sound by using the remote control unit microphone 44 (S7), and the inspection sound is generated by the remote control modem 50 and the public line 18. , Intercom modem 2
It is output from the intercom speaker 22 to the inside of the elevator car 10 via 8. The intercom microphone 24 collects the inspection sound output from the intercom speaker 22,
The recording / playback unit 30 is controlled by the intercom control circuit 26 to record this inspection sound (S8).

After the recording is completed, the line connecting the intercom 20 in the car and the remote control unit 40 is disconnected, and when a certain time elapses (S9), the intercom control circuit 26 causes the intercom modem 28 and the public line 18 to remotely connect. The operation unit 40 is called (S10).

When the remote control section 40 is called and the call between the intercom 20 in the car and the remote control section 40 becomes possible, the intercom control circuit 26 activates the recording / playback section 30, and the recorded check sound is output. It is reproduced (S11).

The reproduced check sound is intercom control circuit 26 and intercom modem 28 public line 1
8 and the remote control modem 50, and is transmitted to the remote control section 40 and output from the remote control section speaker 42. The inspector 16 of the elevator intercom compares the reproduced inspection sound with the inspection sound transmitted from the remote control unit 40, and confirms that the difference between the reproduced inspection sound and the inspection sound at the time of transmission is within an allowable range.
That is, it is determined whether it is normal. (S12). If the reproduced inspection sound is normal, it is determined that the intercom system of the elevator is normal (S13), the inspection work is terminated, and if the difference exceeds the allowable range, the intercom system of the elevator is abnormal. (S1
4) Complete appropriate inspections and other inspection work.

With the intercom system for the elevator of this embodiment having such a structure, it is checked whether the inside of the elevator car can be called from the remote operation unit at the time of inspection, and whether the remote operation unit can be called from the inside of the elevator car. It is possible to inspect whether or not the inspection can be performed by one inspector from a remote operation unit, which makes the inspection work efficient and prevents inspection omissions.

Furthermore, since the inspection sound transmitted from the remote control unit is recorded in the recording / reproducing unit via the interphone speaker and the interphone microphone, and is reproduced and transmitted to the remote control unit, the intercom speaker and the intercom microphone are The inspection of the operating state, that is, whether or not the call between the intercom in the car and the remote control unit can be normally performed can be performed simultaneously with the above inspection. It is also possible to detect an abnormality in the connection state between the external telephone and the intercom in the car.

The remote control unit 40 and the external intercom 12 may be combined.

(Embodiment 2) Next, an intercom system for an elevator according to an embodiment different from Embodiment 1 will be described.

FIG. 4 is a block diagram of an intercom system for an elevator according to the present embodiment. The same parts as those in the drawings already described are designated by the same reference numerals and the description thereof will be omitted.

Here, a feature of this embodiment is that the remote control unit 40 in the first embodiment is replaced by the public telephone 14.

The inspection method is as follows. First, an intercom inspector (not shown) inputs the telephone number (call signal) of the intercom 20 in the elevator car to be inspected using the public telephone 14, and then the intercom 20 in the car. To the public line 18

The intercom control circuit 26 receives this signal via the intercom modem 28, and transmits a signal such as voice requesting the transmission of the function signal to the public telephone 14. In response to this request signal, the intercom inspector uses the function buttons (*, #, etc.) of the public telephone 14 to send a predetermined function signal for controlling the intercom 20 in the car through the public line 18 to the intercom in the car. Send to 20.

This function signal is sent to the intercom modem 28.
It is received by the intercom 26 in the car through, and thereafter, the inspection is performed in the same manner as from S3 in FIG.

That is, after the confirmation of the call state of the external intercom 12, the inspector makes an inspection sound to confirm the intercom 20 in the car.
To the intercom 20 in the car, and the recording / playback unit 30 records it. After a certain period of time,
The intercom control circuit 26 calls the public telephone 14, reproduces the inspection sound recorded in the recording / reproducing section 30 and transmits the reproduction sound to the public telephone 14, and the inspector confirms the reproduction content and performs the inspection.

Therefore, according to the present embodiment, the remote operation section is not required, and the inspection work of the elevator intercom system similar to that of the first embodiment can be performed anytime and anywhere.

(Embodiment 3) Next, Embodiment 1 and Embodiment 2
A further improved example will be described.

The feature of this embodiment is that the intercom system is inspected in consideration of whether or not there is a user in the elevator car.

In the first and second embodiments, when checking the intercom system, it is not considered whether or not there is a user in the elevator car. However, during the inspection
Since the inspection sound is output from the intercom speaker 22 shown in FIG. 4 or the like, the user may be surprised or anxious.

Therefore, in the configuration of the intercom system for the elevator shown in FIGS. 2 and 4, the elevator operation signal is fetched into the intercom control circuit 26, and the intercom 2 in the car 2 is operated by the remote control unit 40 or the public telephone 14.
When 0 is called, the intercom control circuit 26 determines based on this elevator operation signal whether there is a user in the car 10 of FIG. 1 or whether the elevator will stop after a short time. Then, the inspection is permitted by selecting a time that does not cause an inconvenience to the elevator user even if the intercom system is inspected.

As a result, the intercom inspector 16
By waiting until the inspection becomes possible, or by trying the inspection again after a while, the inspection work can be performed without unduly astonishing the user.

(Fourth Embodiment) Next, still another embodiment of the intercom system for an elevator according to the present invention will be described with reference to FIG. It should be noted that the same parts as those of the drawings already described are designated by the same reference numerals and the description thereof will be omitted.

The intercom 20 in the car comprises an intercom speaker 22, an intercom microphone 24, an external intercom call button 20a, and an intercom inspection processing section 20b. Intercom inspection processing unit 2
0b is an intercom control circuit 32 having a CPU,
It is composed of a memory (1) 34 for recording inspection sounds and an intercom modem 28.

The remote control section 40 includes a remote control circuit 52 having a CPU, a remote control modem 50, and a car intercom 2 required for automatic inspection of the intercom system.
EE that records 0 telephone numbers, inspection schedule information, etc.
In order to confirm various data, a memory (2) 54 such as a PROM and a memory (1) 56 such as a RAM serving as a work area when operating the remote control unit, a ten-key pad 46 for inputting the calling number of the intercom 20 in the car, and various data Display 6
0 and a printer 58 that outputs data.

A feature of this embodiment is that the intercom system of the elevator is automatically inspected by the remote operation unit 40.

That is, in the memory (2) 54, the telephone number of the intercom 20 in the car, the inspection schedule information and the like are input and recorded in advance by using the ten-key pad 46, the display 60 and the like. It should be noted that the inspection schedule information takes into consideration a time period when the elevator is rarely used. And the remote control circuit 52 is a memory (2).
An automatic inspection is executed based on the inspection schedule information recorded in 54 and using the memory (1) 56.

Specifically, first, the remote operation control circuit 52 transmits a call signal to the intercom 20 in the car based on the inspection schedule recorded in the memory (2) 54 as in the first or third embodiment. And call. Next, the intercom control circuit 32 confirms the call state between the intercom 20 in the car and the external intercom 12.

In the present embodiment, as in the third embodiment, the elevator operation signal is taken into the intercom control circuit 32, and the time required for inspecting the intercom system does not cause a trouble to the user of the elevator. You have selected.

If the communication state with the external intercom 12 is normal, a predetermined inspection preparation is performed, and after the preparation is completed, an inspection signal of a predetermined frequency is transmitted from the remote operation section 40 to the intercom 20 in the car. The inspection signal is a remote control modem 50,
The signal is output from the intercom speaker 22 into the car 10 through the public line 18 and the intercom modem 28. The intercom microphone 24 collects this inspection signal, and the memory (1) 34 records this inspection signal.

When the recording of the inspection signal is completed, the line connecting the intercom 20 in the car and the remote control unit 40 is once disconnected. Then, after a lapse of a certain time, the intercom control circuit 32 calls the remote operation unit 40 via the intercom modem 28 and the public line 18.

When the remote control section 40 is called, the intercom control circuit 32 reads out the inspection signal recorded in the memory (1) 34, and reads it out.
And to the remote control unit 40 via the public line 18.
The remote control circuit 52 determines whether the intercom system of the elevator is normal or abnormal based on this inspection signal,
The result is output by the printer 58.

Therefore, if the inspection schedule or the like is recorded in the memory (2) in advance, the person who inspects the elevator intercom can perform the inspection only by confirming the output result from the printer. Can be inspected.

(Fifth Embodiment) Next, an embodiment in which a part of the configuration of the fourth embodiment is modified will be described with reference to FIG. A feature of this embodiment is that the elevator operation management unit 38 also serves as the intercom inspection processing unit 20b in the fourth embodiment.

That is, in the figure, 32e is an elevator control circuit having a CPU that also serves as an intercom control, 34e is an elevator operation control memory (1), and like the fourth embodiment, an inspection transmitted from the remote control section 40 is performed. The signal is recorded via the intercom speaker 22 and the intercom microphone 24. Further, if the elevator operation management unit 38 has a modem 28e, it also serves as a modem for intercom inspection processing.

The structure and operation of the remote control unit 40 for inspecting the intercom system of the elevator are the same as those in the fourth embodiment and FIG.

According to the structure of the present embodiment, the elevator control circuit also serves as the intercom control circuit, and the elevator operation signal is supplied to the elevator control circuit. Controlling the intercom system inspection is simplified because there is no need to supply a signal to the intercom control circuit. Further, since the elevator operation management unit also serves as the intercom inspection processing unit, it is not necessary to increase the number of parts and the cost can be reduced.

(Sixth Embodiment) Next, an example in which the configuration of the fifth embodiment is modified will be described with reference to FIG. The same parts in the drawings described above are designated by the same reference numerals and the description thereof will be omitted.

The feature of this embodiment is that the inspection schedule information of the intercom system of the elevator is recorded in advance in the memory (2) 36e such as EEPROM in the elevator operation management unit 38, and the elevator operation management unit 38 operates the elevator. It is to start the inspection at a suitable time according to the above.

That is, the elevator control circuit 32e transmits an inspection start signal to the remote control section 40 based on the inspection schedule information recorded in the memory (2) 36e. As a result, the remote operation control circuit 52 operates, and as in the fourth embodiment, the remote operation control circuit 52 transmits a call signal to the elevator operation management unit 38 that also serves as the intercom inspection processing unit, and calls the elevator operation management unit 38. Make a call.

Remote control unit 40 and elevator operation management unit 3
When 8 is in a call state and the inspection preparation is completed, the remote operation unit 40 sends an inspection signal of a predetermined frequency to the elevator operation management unit 38 via the remote operation modem 50 and the public line 18.
Send to. Then, this inspection signal is output from the intercom speaker 22 to the inside of the elevator car through the elevator modem 28e, the intercom microphone 24 collects it, and the memory (1) 34e records this inspection signal.

When the recording of the inspection signal is completed, the line connecting the elevator operation management unit 38 and the remote control unit 40 is once disconnected. Then, after a lapse of a certain time, the elevator control circuit 32e calls the remote control unit 40 through the elevator modem 28e and the public line 18.

When the remote control unit 40 is called, the elevator control circuit 32e calls the inspection signal recorded in the memory (1) 34e and calls it the elevator modem 28.
It is transmitted to the remote control unit 40 via e and the public line 18. Based on this inspection signal, the remote control circuit 52
It is determined whether the intercom system of the elevator is normal or abnormal, and the printer 58 outputs the result.

The ten-key pad 46 and the display 60 of the remote operation unit 40 are for starting the inspection from the remote operation unit 40 when the inspection start signal is not transmitted from the elevator operation management unit 38. Not necessarily required.

When the remote control unit 40 manages the inspection schedule, the elevator must be retried if the elevator is in use when the elevator operation management unit 38 is called to start the inspection. According to the configuration, since the elevator operation management unit 38 manages the inspection schedule, this procedure can be omitted, and the inspection can be performed more efficiently.

[0074]

According to the present invention, the intercom in the car of the elevator is provided with the recording / reproducing section for recording and reproducing the inspection signal from the remote operation section, and the intercom control circuit in the car for controlling the intercom. The inspection signal transmitted from the operation unit is recorded in the recording / reproducing means, and when the intercom control circuit in the car calls the remote operation unit, the inspection signal is reproduced and transmitted to the remote operation unit.

Therefore, the intercom call inspection in the car from the remote operation unit and the remote operation unit call inspection from the intercom in the car can be performed from the remote operation unit without going to the site.
Since it can be performed by a human inspector, the efficiency of inspection can be improved and inspection omission can be prevented.

Further, since the recording / playback unit records the inspection signal transmitted from the remote operation unit and output from the intercom speaker via the interphone microphone, this is performed when the intercom control unit in the car calls the remote operation unit. By reproducing the inspection signal and transmitting it to the remote control unit, and comparing the reproduction inspection signal with the inspection signal at the time of transmission, the intercom speaker and the intercom microphone can be inspected at the same time as the call inspection.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing an elevator according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of an intercom system according to the elevator shown in FIG.

FIG. 3 is a flowchart showing an inspection procedure of the intercom system of the elevator shown in FIGS. 1 and 2.

FIG. 4 is a configuration diagram of an elevator intercom system according to a second embodiment of the present invention.

FIG. 5 is a configuration diagram of an elevator intercom system according to a fourth embodiment of the present invention.

FIG. 6 is a configuration diagram of an intercom system for an elevator according to a fifth embodiment of the present invention.

FIG. 7 is a configuration diagram of an intercom system for an elevator according to a sixth embodiment of the present invention.

FIG. 8 is a schematic configuration diagram showing a conventional elevator.

[Explanation of symbols]

 10 Elevator car 12 External intercom 14 Public telephone 16 Inspector 18 Public line 20 In-car intercom 20a External intercom call button 20b Intercom inspection processing section 22 Intercom speaker 24 Intercom microphone 26 Intercom control circuit 30 Intercom modem 30 Recording / playback section 40 Remote Operation unit 42 Remote operation unit speaker 44 Remote operation unit microphone 46 Numeric keypad 48 Remote operation control circuit 50 Remote operation modem

Claims (3)

[Claims] 1. An intercom in a car of an elevator, and a remote control means for remotely operating the intercom in the car,
An intercom system for an elevator having, wherein the intercom in the car records and reproduces an inspection signal transmitted from the remote operation means, and recording / reproduction means, and when the inspection signal is transmitted from the remote operation means. An intercom that causes the recording / reproducing means to record the inspection signal, causes the recording / reproducing means to reproduce the inspection signal recorded when the remote operation means is called, and transmits the reproduced inspection signal to the remote operation unit. An intercom system for an elevator, comprising: a control unit. 2. The intercom in the elevator car has an intercom speaker and an intercom microphone, and the recording / reproducing means is transmitted from the remote control means, is output from the intercom speaker, and is collected by the intercom microphone. The elevator intercom system according to claim 1, wherein the inspection signal is recorded. 3. An intercom control unit, an intercom speaker, an intercom microphone, and an inspection signal are recorded / recorded.
A recording / reproducing means for reproducing, an intercom in a car of an elevator having: an intercom system of an elevator having: a remote operating means for remotely operating the intercom in the car, wherein the remote operating means is: The inspection signal of the intercom system is transmitted to the intercom control means, the intercom control means causes the recording / playback means to record the inspection signal output from the interphone speaker and collected by the intercom microphone, and recording the inspection signal. After completion, the intercom control means calls the remote operation means, reproduces the inspection signal recorded in the recording / reproducing means, and transmits the reproduction signal to the remote operation means. .