JP2002047863A - Radio signal communication device for opening/closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily comply with a change request of communication capacity between a remote control transmitter and a remote control receiver. SOLUTION: This radio signal communication device for an opening/closing device for controlling opening/closing of an opening/closing body has a permanent antenna and one or a plurality of antenna extension connectors capable of connecting an extension antenna unit. Communication capacity can be changed by connecting the extension antenna unit to the antenna extension connector.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio signal communication device for a switching device, for example, a shutter, a door, a window, an overhead door, a gate, a gate (a gate of a parking lot, etc.), a roll screen (for example, a light shielding film), a blind. The present invention can be applied to a remote control transmitter or a remote control receiver of a remote control system for remotely controlling an awning device or the like.

[0002]

2. Description of the Related Art Opening / closing control of an opening / closing body (in the case of an opening / closing body having a locking / unlocking function, locking / unlocking control is also a term of opening / closing control in addition to or instead of opening / closing control. Many opening / closing devices have been proposed which can be instructed by using a remote control transmitter.

In such a remote control system for a shutter, a remote control receiver for capturing and processing radio waves from a remote control transmitter is provided on a wall surface near the shutter, on a surface or inside a storage box of the shutter, or the like. .

FIG. 4 is a block diagram showing a configuration of a conventional remote control system. The remote control system includes a remote control transmitter 10 and a remote control receiver, and the remote control receiver includes a reception antenna 11 and a reception unit 13.

An electric signal obtained by capturing and converting a radio wave from the remote control transmitter 10 by the receiving antenna 11 is transmitted through a coaxial cable 12 of, for example, about 3 m to 8 m connected to the receiving antenna 11 and the receiving unit 13 by connectors. Via the receiving unit 13.

In the receiving unit 13, an electric signal from the receiving antenna 11 is demodulated by a demodulation unit 14, and the demodulated signal is decoded by a reception control unit 15 to instruct opening, closing or stopping of a shutter. An open / close control signal is formed and provided to a shutter control unit 17 via a cable 16 having connectors at both ends.

In the shutter control unit 17,
The shutter control unit 18 forms a motor drive signal for realizing opening, closing, or stopping of the shutter based on the content (open, closed, or stopped) of the opening / closing control signal from the receiving unit 13, and the motor drive circuit 19 According to the motor drive signal, a desired operation (forward rotation,
Reverse rotation, rotation stop, etc.).

Here, as the remote control receiver, there is a remote control receiver in which the receiving antenna 11 is provided externally to the receiving unit 13 as shown in FIG.
The receiving antenna 11 is, for example, a demodulator 14 or a reception controller 1
5 is mounted as a pattern (a planar antenna) such as a copper foil on a printed wiring board on which the substrate 5 is mounted.

The latter receiving antenna (built-in antenna) 11
In the case of using a shutter, the communication distance between the remote control transmitter and the remote control receiver can be short, and it is considered that the shutter will become mainstream in the future.

[0010]

However, the conventional remote control system has the following various problems.

[0011] In the conventional remote control receiver, the actual communication distance with the remote control transmitter depends considerably on the receiving sensitivity of the receiving antenna. Further, the direction in which communication with the remote control transmitter is possible also depends considerably on the directivity of the receiving antenna.

For this reason, depending on the mounting position of the remote control receiver, the distance that can be communicated may be shortened even if the receiving antenna is the same, and the direction in which communication is possible may be narrowed even if the receiving antenna is the same. There is.

There are also users who want to control the shutter by the remote control transmitter even from a distance longer than the distance specified by the remote control system.

If an external receiving antenna is applied, the position can be adjusted to one that satisfies the receiving distance and the receivable direction by appropriately selecting the position. However, a remote control receiver using a built-in antenna such as a planar antenna as a receiving antenna is difficult to cope with even when the communication distance or direction is unsatisfactory. Further, even when an external receiving antenna is applied, there is a limit in responding to the above-mentioned requirements and in solving the above-mentioned problems, and there is a limit to a demand for further receiving sensitivity. I can't respond.

There is a limit to improving the receiving sensitivity by the AGC function in the demodulation unit and the like, and the circuit configuration becomes complicated.

[0016] Conversely, with a permanent antenna, effective communication is executed depending on the capability of the receiving antenna, even if the instruction is from a place separated by a distance greater than the distance desired by the user.

The present invention has been made in consideration of the above points, and has been made to provide a wireless signal communication device of a switchgear capable of easily responding to a request for changing communication capability such as a communication distance and a direction. is there.

[0018]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a radio signal communication apparatus for a switching device according to the present invention has a permanent antenna and one or more antenna extension connectors to which an extension antenna unit can be connected. It is characterized by the following.

Here, the permanent antenna is a built-in antenna provided in the housing of the communication device, and the additional antenna unit can be connected so that the antenna expansion connector is located outside the housing of the communication device. Is preferred.

Preferably, an antenna extension connector is provided so that the extension antenna unit and the permanent antenna are connected in parallel to the communication circuit when the extension antenna unit is connected. It is also preferable that an antenna extension connector is provided so that the extension antenna unit is connected in series to the permanent antenna at the time of connection.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (A) First Embodiment Hereinafter, a first embodiment in which a wireless signal communication device of a switching device according to the present invention is applied to a remote control receiver of a remote control system for a shutter will be described with reference to the drawings. It will be described in detail.

FIG. 1 is a block diagram showing a remote control receiver (receiving unit) 20 according to the first embodiment.

Referring to FIG. 1, a remote control receiver 20 according to the first embodiment includes a built-in antenna 21, a demodulation circuit 22, a reception control circuit 23, a relay transmission circuit 24, and a power supply circuit 25, and an external antenna unit 30 It has a connectable antenna extension connector 26 and the like. FIG.
5 shows a state in which the external antenna unit 30 is connected to the antenna extension connector 26.

The built-in antenna 21 captures a radio wave radiated from a remote control transmitter (not shown) and gives it to the demodulation circuit 22 as an electric signal. The built-in antenna 21 may be detachable, but is a permanent antenna. Basically, the built-in antenna 21 can achieve a radio wave capturing function only with the built-in antenna 21.

The built-in antenna 21 may have any of the following forms. For example, on a printed wiring board on which a demodulation circuit 22, a reception control circuit 23, a relay transmission circuit 24, a power supply circuit 25, and the like are mounted, a planar shape is formed in the same manner as a wiring pattern (for example, a copper foil pattern). May be. Further, for example, it may be formed by joining metal pieces such as copper pieces or punching out a copper plate or the like (in this case, it is not necessary to provide them on a printed wiring board). Further, for example, it may be constituted by a rod such as a column or a cylinder (in this case, it is not necessary to provide the rod on a printed wiring board). In addition, any type such as a loop antenna and a dipole antenna may be used.

The demodulation circuit 22 includes, for example, the built-in antenna 2
1 and the like, an impedance matching circuit, a preamplifier circuit (which also has a filter function), a demodulation circuit body, and the like.
It demodulates an electric signal (radio frequency band signal) from the built-in antenna 21 or the like, obtains a baseband signal (digital signal) that a remote control transmitter (not shown) intends to transmit, and provides it to the reception control circuit 23. Note that when a received electric signal from an antenna is input to the demodulation circuit 22 and demodulation processing is performed, a driving signal from the demodulation circuit 22 causes L
The reception light emitting element 22a such as an ED is turned on or off.

The reception control circuit 23 controls each part of the remote control receiver 20, and is composed of, for example, a microcomputer. The reception control circuit 23
By decoding the demodulation signal from the demodulation circuit 22, the remote control transmitter at the transmission source can issue an instruction to the shutter based on whether or not the ID included in the demodulation signal is registered in the built-in ID memory 24. After confirming whether the shutter operation is performed, the operation content of the designated shutter, that is, the opening operation, the closing operation, or the stopping operation of the shutter is recognized, and the relay transmission circuit 24 is driven according to the recognition result. is there. When driving the relay transmission circuit 24, the reception control circuit 23 turns on or off the control operation light emitting element 23a such as an LED.

The reception control circuit 23 ignores the content of the instruction, for example, when the source remote controller cannot issue an instruction for the shutter.

The relay transmission circuit 24 transmits a shutter drive signal indicating a shutter opening operation, a closing operation or a stopping operation to a shutter driving unit (not shown). The relay transmission circuit 24 has a plurality of relays and relay contacts, and under the control of the reception control circuit 23,
A shutter drive signal indicating a shutter opening operation, a closing operation, or a stop operation is transmitted to a shutter driving unit (not shown) through a relay for a desired operation being driven to close a relay contact.

A connector 24b is provided in association with the relay transmission circuit 24. The connector 24b has one connector (not shown) of a signal line connecting the remote control receiver 20 and the shutter drive unit. Connected.

The transmission circuit of the shutter drive signal is:
A relay that does not use a relay may be used.

The remote control receiver (reception unit) 20 and the shutter drive unit may of course be integrated into one unit.

The power supply circuit 25 converts power supplied from the shutter drive unit via a power supply line into power for each unit in the remote control receiver 20 and supplies the power to each unit. The power supply circuit 25 turns on the power supply light emitting element 25a such as an LED when receiving power supply from the shutter drive unit side.

Further, a connector 25b is provided in association with the power supply circuit 25, and one connector (not shown) of the above-described power supply line is connected to the connector 25b.

The remote control receiver 20 may operate on an internal power supply such as a battery, or may use an external power supply and an internal power supply together.

The shutter drive unit (not shown) is constituted, for example, mainly by a motor for moving the shutter up and down. The shutter drive unit is provided to the motor in response to a shutter drive signal from the remote control receiver 20. (For forward rotation, reverse rotation, rotation stop, etc.)
The shutter is opened, closed, and stopped.

The remote control receiver 20 according to the first embodiment includes:
In addition to the above-described configuration similar to the related art, the antenna extension connector 26 connectable to the external antenna unit 30 is provided.
Having.

The antenna extension connector 26 is connected to the demodulation circuit 22 via a signal line 27.

The external antenna unit 30 as an additional antenna unit is connected to the antenna additional connector 26.
Can be connected.

Although the detailed configuration of the external antenna unit 30 is not shown, for example, any of the following configurations may be used.

The first one is composed of an antenna main body and a connector provided at an end thereof and engaging with the antenna extension connector 26. Second, the antenna body,
A cable extending therefrom (for example, a coaxial cable) and a connector provided at the end of the cable and engaging with the antenna extension connector 26 are provided. Third, an antenna body and a cable extended from the antenna body (for example, a coaxial cable) are used. In this case, the antenna extension connector 26 attaches the stripped cable end. It is something that can be done. Here, the antenna body of the external antenna unit 30 may be of any type such as a rod antenna, a loop antenna, a dipole antenna, or the like. The antenna body of the external antenna unit 30 may be one in which the antenna element can expand and contract, can rotate, and can change the direction of the main directional direction.

The antenna extension connector 26 is covered with, for example, a cover so as to prevent rainwater and dust from entering the remote control receiver 20 when the external antenna unit 30 is not attached. It is preferable to have a shape that can be crowned. Of course, the shape of the lid needs to be adjusted to the shape of the connector 26 for antenna addition (particularly, the shape of the opening). It is also preferable that the antenna extension connector 26 be recessed inside a housing or the like in order to prevent the antenna extension connector 26 from hindering a remote control operator or the like when the external antenna unit 30 is not attached.

The basic functions of the demodulation circuit 22 are as described above. The capture will be described in consideration of the case where the external antenna unit 30 is attached, as follows.

The demodulation circuit 22 includes the external antenna unit 3
An electric signal from 0 or a processed signal thereof may be combined with an electric signal from the built-in antenna 21 as a basic antenna or a processed signal thereof (combined diversity processing may be performed). . The demodulation circuit 2
2 may select an electric signal from the external antenna unit 30 instead of an electric signal from the built-in antenna 21 when an electric signal from the external antenna unit 30 is given.

In the former case (in the case of combining), for example, the electric signal from the external antenna unit 30 and the electric signal from the built-in antenna 21 may be combined at the input stage of the demodulation circuit 22. After that, the signals may be combined before the demodulation processing (in this case, a plurality of preamplifier circuits are provided), or may be combined at the demodulated baseband signal stage (in this case, a plurality of demodulation circuit bodies are also provided). Provided). In addition, the combination may be simple combination (superposition), or may be one that controls a combination ratio such as maximum ratio diversity.

For the synthesis or selection process as described above,
As a method of causing the demodulation circuit 22 to recognize that the external antenna unit 30 is provided, for example, a method of providing a sensor that outputs a mounting detection signal when a connector or the like corresponding to the antenna expansion connector 26 is engaged. Alternatively, the operator may operate a dip switch or the like to notify the user of the attachment of the external antenna unit 30, or the demodulation circuit 22 itself may detect the presence or absence of an electric signal from the external antenna unit 30. There may be.

The remote control receiver 20 of the first embodiment as described above basically uses only the built-in antenna 21 which is a permanent antenna without providing the external antenna unit 30.

Here, when there is a request to increase the receiving sensitivity at the time of installation, or when there is a request to increase the receiving sensitivity during use, the external antenna unit 3
0 is attached to the antenna extension connector 26.

As a result, the external antenna unit 30 becomes effective instead of the internal antenna 21, or both the internal antenna 21 and the external antenna unit 30 become effective. As a result, the ability to capture radio waves from the remote control transmitter is improved, and the reception sensitivity can be increased.

In the above, the case where the external antenna unit 30 is added in order to increase the reception sensitivity has been described. However, the external antenna unit 30 is widely used to change the reception sensitivity (including the case where the reception sensitivity is lowered as well as the case where it is increased). A unit 30 may be provided. Here, in the case where the receiving sensitivity is reduced, the receiving sensitivity may be lowered by rejecting the signal input from the built-in antenna 21 by the demodulation circuit 22 to make only the signal from the external antenna unit 30 effective. 2
For example, the receiving sensitivity may be reduced by removing the built-in antenna 21 by making the attachment 1 detachable with a coupling tool such as a screw. The built-in antenna 21
May be removed also when increasing the receiving sensitivity.

According to the remote control receiver of the first embodiment, since the antenna extension connector 26 is provided, by providing the external antenna unit 30, the communication capability between the remote control transmitter and the remote control receiver can be changed. Requests can be easily met.

(B) Second Embodiment Next, a second embodiment in which the wireless signal communication device of the switching device according to the present invention is applied to a remote control receiver of a remote control system for a shutter will be described in detail with reference to the drawings. Will be described.

FIG. 2 is a block diagram showing a remote control receiver (receiving unit) 20A according to the second embodiment. The same and corresponding parts as those in FIG. 1 according to the above-described first embodiment are shown in FIG. The same reference numerals are given. FIG. 2 also shows a state in which the external antenna unit 30 is added.

The remote control receiver 20 according to the first embodiment has a built-in antenna 21 and an external antenna unit 3.
The external antenna unit 30 can be added so that 0 is connected to the demodulation circuit 22 in parallel.

The remote control receiver 20 according to the second embodiment
In A, an antenna extension connector 26 is provided so that an external antenna unit 30 can be extended in series with respect to the built-in antenna 21. That is, the expansion of the antenna element is expanded. Except for this point, it is the same as the first embodiment.

When the external antenna unit 30 is added, the characteristics in the demodulation circuit 22 (for example, characteristics in an impedance matching circuit) may be switched.

Since the remote control receiver of the second embodiment also includes the antenna extension connector 26, the external antenna unit 30 is added to improve the communication capability between the remote control transmitter and the remote control receiver. Requests can be easily met.

(C) Third Embodiment Next, a third embodiment in which the wireless signal communication device of the switching device according to the present invention is applied to a remote control transmitter of a remote control system for a shutter will be described in detail with reference to the drawings. Will be described.

FIG. 3 is a block diagram showing a remote control transmitter 40 according to the third embodiment. FIG. 3 also shows a state in which the external antenna unit 50 is added.

In FIG. 3, a remote control transmitter 40 according to the third embodiment includes an operation section 41, a control circuit 42, and a transmission circuit 4.
3, a built-in antenna 44, a notification unit 45, a battery 46, and an antenna extension connector 47.

The operation unit 41 includes keys for instructing an opening operation, a stopping operation, a closing operation, and the like of the shutter, and controls an instruction signal of the opening, closing, or stopping operation of the shutter in accordance with a user operation. This is given to the circuit 42.

The control circuit 42 controls the remote control transmitter 40
, And is constituted by, for example, a microcomputer.

When the control circuit 42 receives an instruction signal for an open operation, a close operation or a stop operation from the operation unit 41, it assembles an original transmission signal (for example, serial transmission data) and supplies it to the transmission circuit 43. When receiving an instruction signal of an opening operation, a closing operation, or a stopping operation from the operation unit 41, the control circuit 42 notifies the notification unit 45 that the instruction has been received.
Is notified.

The transmission circuit 43 modulates the original transmission signal into a signal in a radio frequency band (radio transmission signal), and radiates the signal from a built-in antenna 44 or the like into space. The transmission circuit 43 includes a band-pass filter and a power amplifier as necessary. Although the modulation scheme of the original transmission signal is arbitrary, for example, an ASK modulation scheme or an FSK modulation scheme can be applied.

As described above, the built-in antenna 44 radiates a radio transmission signal into space, and is a permanent antenna. The built-in antenna 44 may have any of the following forms. For example, the control circuit 42
It may be a planar shape formed on a printed wiring board on which the circuit and the transmission circuit 43 are mounted in the same manner as a wiring pattern (for example, a copper foil pattern). Further, for example, it may be formed by joining metal pieces such as copper pieces or punching out a copper plate or the like (in this case, it is not necessary to provide them on a printed wiring board). Further, for example, it may be constituted by a rod such as a column or a cylinder (in this case, it is not necessary to provide the rod on a printed wiring board). In addition, any type such as a loop antenna and a dipole antenna may be used.

The notification section 45 is controlled by the control circuit 42 to
The notification operation is performed to make the user recognize that the instruction signal of the opening operation, the closing operation, or the stop operation from the operation unit 41 has been received. The notification unit 45 may be, for example, a light emitting element corresponding to each key of the operation unit 41, and may be a device that visually notifies by lighting or blinking (a visual notification by a character such as a liquid crystal display may be used). Alternatively, for example, a buzzer or a speaker may be audibly notified.

The battery 46 supplies an operating power to each part of the remote control transmitter 40.

The antenna extension connector 47 is connected to the built-in antenna 44, and is connected to the external antenna unit 50.
Can be added.

External antenna unit (expansion antenna unit) 5 connected to this antenna expansion connector 47
Reference numeral 0 denotes, for example, an antenna main body and a connector that is provided at the base end thereof and engages with the antenna expansion connector 47. The antenna body may be of any type, such as a rod antenna, a loop antenna, a dipole antenna, or the like, but a rod antenna would be preferable in consideration of what the remote control transmitter 40 is carried by the user. The external antenna unit 50
May be such that the antenna element can expand and contract.

The antenna expansion connector 47 is covered with, for example, a cover so that rainwater and dust can be prevented from entering the remote control transmitter 40 when the external antenna unit 50 is not attached. Is crowned. Of course, it is necessary to adjust the shape of the lid to the shape (particularly, the shape of the opening) of the connector for antenna addition 47. It is also preferable that the antenna expansion connector 47 be recessed inside a housing or the like in order to prevent the antenna expansion connector 47 from hindering a remote controller operator or the like when the external antenna unit 50 is not attached.

The characteristics (amplification factor) of the power amplification circuit in the transmission circuit 43 may be switched between a state where the external antenna unit 50 is added and a state where the external antenna unit 50 is not added.

In this case, as a method of causing the transmitting circuit 43 to recognize that the external antenna unit 50 is provided, for example, a mounting detection signal is output when a connector corresponding to the antenna expansion connector 47 is engaged. May be provided by providing a sensor for outputting an external antenna unit 5 by operating a dip switch or the like by an operator.
A method of notifying that 0 is attached may be used.

The remote control transmitter 40 according to the third embodiment having the above-described configuration basically uses only the built-in antenna 47 as an antenna without providing the external antenna unit 50. .

Here, when there is a request from the remote control transmitter 40 to increase the transmission capability, or when there is a request to increase the transmission capability during use, the external antenna unit 50 is used. Is an antenna expansion connector 47
Attached to.

According to the remote control transmitter of the third embodiment, since the connector 47 for antenna addition is provided, by adding the external antenna unit 50, the communication capability between the remote control transmitter and the remote control receiver can be improved. An improvement request can be easily met.

(D) Other Embodiments In the third embodiment described above, the built-in antenna 44 and the external antenna unit 50 are connected in series.
The built-in antenna 44 and the external antenna unit 50 may be provided in parallel.

In each of the above embodiments, the number of antennas that can be added (the number of connectors for adding antennas) is one, but a plurality of antennas may be added. In this case, a part of the additional antenna may be provided in parallel with the permanent antenna (an example of the built-in antenna in each of the above embodiments), and the other part may be connected in series. The number of permanent antennas is not limited to one.

Further, in each of the above embodiments, the permanent antenna is a built-in antenna, and the additional antenna is an external antenna. However, the permanent antenna may be an external antenna, and the additional antenna may be provided inside the housing of the communication device. It may be a built-in antenna provided.

For example, in the case where the permanent antenna is an external antenna, the tip of the antenna element is provided with a mounting structure so that an additional antenna element can be added to improve the communication capability. It may be achieved. The connector for adding antennas in the claims includes such a mounting structure.

In each of the above embodiments, the present invention is applied to a shutter remote control system.
Doors, windows, overhead doors, gates, gates (gates for parking lots, etc.), roll screens (for example, light shielding films),
The present invention may be applied to a remote control system of an opening / closing device that generally controls an opening / closing body such as a blind or an awning device.

Further, in each of the above embodiments, the present invention is applied to the remote control system (wireless communication system) for controlling the opening / closing body (shutter), but other wireless communication systems related to the opening / closing body are used. The present invention can be applied to any of the transmitters and receivers. For example, information on the opening / closing operation held by the opening / closing body control section (opening / closing position, number of times of opening / closing, obstacle information related to opening / closing, presence / absence of obstacle contact, etc.)
The present invention can also be applied to a wireless device in a communication system in which is transmitted to a wireless device (or a remote control transmitter) possessed by a maintenance person or a remote control operator and displayed. In this case, the transmission timing and the like may be arbitrarily set (the day of the week and time may be set, or the transmission may be instructed), and the transmission activation to the transmission-side wireless device is given from outside via a wired system. It may be something.

[0082]

According to the radio signal communication apparatus for a switchgear of the present invention, since a permanent antenna and one or more antenna extension connectors to which an extension antenna unit can be connected are provided, the extension antenna is added to the antenna extension connector. By connecting to a unit, it is possible to easily respond to a change request for communication capability.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a remote control receiver according to a first embodiment.

FIG. 2 is a block diagram illustrating a configuration of a remote control receiver according to a second embodiment.

FIG. 3 is a block diagram illustrating a configuration of a remote control transmitter according to a third embodiment.

FIG. 4 is a block diagram showing a conventional remote control system.

[Explanation of symbols]

20, 20A ... remote control receiver, 21, 44 ... built-in antenna (permanent antenna), 22 ... demodulation circuit, 26, 47 ...
Antenna extension connector, 30: external antenna unit (extension antenna unit), 40: remote control transmitter.

 ──────────────────────────────────────────────────の Continuing on the front page F term (reference) 2E042 AA01 CA15 CB01 CB02 CB05 CB06 2E052 AA01 AA02 AA04 AA05 BA04 CA06 EA14 EB01 GC10 GD00 GD03 GD09 KA13 KA25 KA27 2E250 AA10 BB08 BB65 BB06 FB65 A06 HA01 HA02 HA05 HA07 HA13 HA18 HA23 HA24 HA31 HA37 5K060 BB07 CC05 DD08 GG03 HH00

Claims (4)

[Claims] An opening / closing device for controlling the opening / closing of an opening / closing body, wherein a wireless signal transmitting device or a wireless signal receiving device of a wireless signal communication device, wherein a permanent antenna and an additional antenna unit can be connected.
Alternatively, a wireless signal communication device for a switchgear, comprising: a plurality of antenna extension connectors. 2. The communication system according to claim 1, wherein the permanent antenna is a built-in antenna provided in a housing of the communication device, and the extension antenna unit is connected so that the antenna expansion connector is located outside the housing of the communication device. The wireless signal communication device for a switchgear according to claim 1, wherein the wireless signal communication device is provided. 3. When the additional antenna unit is connected,
The radio of the switchgear according to claim 1 or 2, wherein the antenna extension connector is provided so that the extension antenna unit and the permanent antenna are connected in parallel to a communication circuit. Signal communication device. 4. When the additional antenna unit is connected,
The wireless signal communication device for a switchgear according to claim 1 or 2, wherein the additional antenna connector is provided so that the additional antenna unit is connected to the permanent antenna in series.