JP2021174572A - Control system and controller - Google Patents

Abstract

To obtain a control system and a controller that can easily select a frequency channel to be used.SOLUTION: A control system according to the present disclosure includes one or more terminal devices, and a controller determines whether to receive a wireless signal of another control system when each of a plurality of frequency channels is set as a channel used for wireless communication, and wirelessly communicates with the terminal device using a channel selected from the frequency channels for which no wireless signal has been received as the channel used.SELECTED DRAWING: Figure 7

Description

The present disclosure relates to control systems and controllers.

Patent Document 1 discloses a lighting fixture including a light source, a lighting circuit that controls lighting of the light source, and a wireless communication module that is connected to the lighting circuit and wirelessly communicates with another lighting fixture or a lighting control device. There is. The wireless communication module has a wireless communication control circuit that transmits a received signal to a lighting circuit, and a command receiving means that receives a command from the outside. The command receiving means is a switch that receives an operation. The address of the wireless communication module is set based on the operation of the switch.

Japanese Patent No. 6500559

In the lighting fixture of Patent Document 1, it is conceivable that there is another lighting control system in the surroundings. In this case, it may be necessary to select the frequency channel of the wireless communication module in consideration of the frequency channel used by other lighting control systems. Therefore, it may take time and effort to select the frequency channel.

The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to obtain a control system and a controller capable of easily selecting a frequency channel to be used.

In the control system according to the present disclosure, when one or more terminal devices and each of the plurality of frequency channels are set to the channels used for wireless communication, the radio signals of other control systems are transmitted. It is provided with a controller that determines whether or not to receive and wirelessly communicates with the terminal device using the selected channel selected from the frequency channels for which the radio signal was not received among the plurality of frequency channels as the used channel. ..

In the controller according to the present disclosure, when the communication unit that performs wireless communication and each of the plurality of frequency channels are set to the channels used in the wireless communication, the communication unit of the other control system It is determined whether or not to receive the radio signal, and the selected channel selected from the frequency channels for which the radio signal was not received among the plurality of frequency channels is used as the used channel and wirelessly communicates with the terminal device via the communication unit. It is provided with a control unit that performs communication.

In the control system according to the present disclosure, the controller determines a frequency channel used in another control system, and selects a channel used in wireless communication from unused frequency channels. Therefore, the frequency channel to be used can be easily selected.
The controller according to the present disclosure determines a frequency channel used in another control system, and selects a channel used in wireless communication from unused frequency channels. Therefore, the frequency channel to be used can be easily selected.

It is a block diagram which shows the structure of the control system which concerns on Embodiment 1. FIG. It is a block diagram which shows the structure of the controller which concerns on Embodiment 1. FIG. It is a block diagram which shows the structure of the lighting fixture which concerns on Embodiment 1. FIG. It is a block diagram which shows the structure of the sensor which concerns on Embodiment 1. FIG. It is a block diagram which shows the structure of the wall switch which concerns on Embodiment 1. FIG. It is a figure which shows the correspondence relationship of a wireless communication address and a frequency channel. It is a sequence diagram explaining the batch setting method of the address which concerns on Embodiment 1. FIG. It is a sequence diagram explaining the method of adding the terminal apparatus which concerns on Embodiment 1. FIG. It is a sequence diagram explaining the method of setting the address to the selected terminal device which concerns on Embodiment 1. FIG. It is a sequence diagram explaining the setting method of the system ID which concerns on Embodiment 1. FIG.

The control system and the controller according to the present embodiment will be described with reference to the drawings. The same or corresponding components may be designated by the same reference numerals and the description may be omitted.

Embodiment 1.
FIG. 1 is a block diagram showing a configuration of the control system 1 according to the first embodiment. The control system 1 includes a plurality of terminal devices, a controller 2, and a setting device 6. The plurality of terminal devices include a plurality of lighting fixtures 3, a sensor 4, and a wall switch 5. The plurality of luminaires 3 include luminaires 3-1 to 3-n. The control system 1 may have one or more lighting fixtures 3. The control system 1 is a lighting control system. The controller 2 is a lighting controller that controls the lighting fixture 3.

The setting device 6 is used by the operator for various settings. The setter 6 communicates with the controller 2 by, for example, infrared wireless communication 10. The setting device 6 transmits a channel setting command to the controller 2. The channel setting command includes an address batch setting command, an address addition command, a device selection address setting, a system ID setting command, and the like, which will be described later.

Further, the controller 2 communicates with the terminal device by the wireless communication 11. Each of the plurality of lighting fixtures 3, the sensor 4, and the wall switch 5 has a wireless communication function. The plurality of lighting fixtures 3, the sensor 4, and the wall switch 5 are individual devices. The wireless communication 11 between the controller 2 and the terminal device is, for example, wireless communication in the 920 MHz band or wireless communication in the 2.4 GHz band.

FIG. 2 is a block diagram showing a configuration of the controller 2 according to the first embodiment. The controller 2 includes a control unit 21, an address storage unit 22, a wireless communication unit 23, an infrared communication unit 24, a human detection sensor unit 25, a brightness sensor unit 26, an LED status display unit 27, and a power supply unit 28. The control unit 21 performs calculations for realizing the functions of the controller 2 and calculations necessary for controlling the luminaire 3. The address storage unit 22 stores a used channel, which is a frequency channel used in the wireless communication 11.

The wireless communication unit 23 performs wireless communication 11. The wireless communication unit 23 transmits and receives wireless signals to and from the terminal device. The infrared communication unit 24 performs infrared wireless communication 10 with the setting device 6.

The human detection sensor unit 25 detects the presence or absence of a person and transmits the detected information to the control unit 21. The brightness sensor unit 26 detects the brightness and transmits the detected information to the control unit 21. The control unit 21 controls the lighting fixture 3 via the wireless communication unit 23 based on the information received from the wireless communication unit 23, the infrared communication unit 24, the person detection sensor unit 25, and the brightness sensor unit 26.

The LED status display unit 27 displays, for example, the status of the controller 2 on the LED. The power supply unit 28 generates power for each unit of the controller 2. The control unit 21 controls the LED status display unit 27 and the power supply unit 28.

The control unit 21 is formed of, for example, a microcomputer. Further, the address storage unit 22 is formed of, for example, a non-volatile memory. As will be described later, when the control unit 21 sets the frequency channel to the channel used for wireless communication in the wireless communication unit 23 for each of the plurality of frequency channels, the wireless communication unit 23 uses the other control system. Determines whether to receive a radio signal. Further, the control unit 21 wirelessly communicates with the terminal device via the wireless communication unit 23, using the selected channel selected from the frequency channels for which the radio signals of the other control system have not been received among the plurality of frequency channels as the channels to be used. I do.

FIG. 3 is a block diagram showing the configuration of the lighting fixture 3 according to the first embodiment. The lighting fixture 3 includes a control unit 31, an address storage unit 32, a wireless communication unit 33, an LED light source unit 34, an LED control unit 35, and a power supply unit 38. The control unit 31 performs calculations for realizing the functions of the lighting fixture 3 and calculations necessary for controlling the LED light source unit 34. The address storage unit 32 stores a used channel, which is a frequency channel used in the wireless communication 11.

The wireless communication unit 33 performs wireless communication 11. The wireless communication unit 33 transmits and receives a wireless signal to and from the controller 2. The wireless communication unit 33 receives an address setting signal, a device ID monitor signal, a system ID setting signal, a dimming control signal, and the like, which will be described later, from the controller 2. The control unit 31 controls each unit of the lighting fixture 3 according to the wireless signal received by the wireless communication unit 33. Further, the control unit 31 transmits information about the lighting fixture 3 from the wireless communication unit 33 to the controller 2 in response to the wireless signal received by the wireless communication unit 33.

The LED control unit 35 controls the LED light source unit. The LED control unit 35 controls the electric power supplied to the LED light source unit 34 in response to a control signal from, for example, the control unit 31. The LED light source unit 34 has a light source. The light source is, for example, a light emitting element such as an LED. The power supply unit 38 generates a power source for each part of the lighting fixture 3.

The control unit 31 is formed of, for example, a microcomputer. Further, the address storage unit 32 is formed of, for example, a non-volatile memory.

FIG. 4 is a block diagram showing the configuration of the sensor 4 according to the first embodiment. The sensor 4 includes a control unit 41, an address storage unit 42, a wireless communication unit 43, an infrared communication unit 44, a human detection sensor unit 45, a brightness sensor unit 46, an LED status display unit 47, and a power supply unit 48. The control unit 41 performs an operation for realizing the function of the sensor 4. The address storage unit 42 stores a used channel, which is a frequency channel used in the wireless communication 11.

The wireless communication unit 43 performs wireless communication 11. The wireless communication unit 43 transmits and receives a wireless signal to and from the controller 2. The infrared communication unit 44 performs infrared wireless communication with, for example, the setting device 6.

The human detection sensor unit 45 detects the presence or absence of a person and transmits the detected information to the control unit 41. The brightness sensor unit 46 detects the brightness and transmits the detected information to the control unit 41. The control unit 41 transmits the information received from the human detection sensor unit 45 and the brightness sensor unit 46 to the controller 2 via the wireless communication unit 43.

The LED status display unit 47 displays, for example, the status of the sensor 4 on the LED. The power supply unit 48 generates power for each unit of the sensor 4. The control unit 41 controls the LED status display unit 47 and the power supply unit 48.

The control unit 41 is formed of, for example, a microcomputer. Further, the address storage unit 42 is formed of, for example, a non-volatile memory.

FIG. 5 is a block diagram showing the configuration of the wall switch 5 according to the first embodiment. The wall switch 5 includes a control unit 51, an address storage unit 52, a wireless communication unit 53, a switch input unit 54, an LED status display unit 57, and a power supply unit 58. The control unit 51 performs an operation for realizing the function of the wall switch 5. The address storage unit 52 stores a used channel, which is a frequency channel used in the wireless communication 11. The wireless communication unit 53 performs wireless communication 11. The wireless communication unit 53 transmits and receives a wireless signal to and from the controller 2.

A signal for controlling the lighting state of the luminaire 3 is input to the switch input unit 54 by turning the switch on and off. The signal for controlling the lighting state of the lighting fixture 3 is, for example, a lighting signal and a turning-off signal of the lighting fixture 3. The control unit 51 transmits the signal input from the switch input unit 54 to the controller 2 via the wireless communication unit 53. The controller 2 controls the lighting state of the lighting fixture 3 according to the signal received from the wall switch 5.

The LED status display unit 57 displays, for example, a status such as lighting or extinguishing of the lighting fixture 3 on the LED. The power supply unit 58 generates power for each part of the wall switch 5. The control unit 51 controls the LED status display unit 57 and the power supply unit 58.

The control unit 51 is formed of, for example, a microcomputer. Further, the address storage unit 52 is formed of, for example, a non-volatile memory.

In this way, all terminal devices are configured to be able to communicate wirelessly with the controller 2.

FIG. 6 is a diagram showing a correspondence relationship between a wireless communication address and a frequency channel. In order for the controller 2 to wirelessly communicate with a lighting control device such as a lighting fixture 3, a sensor 4, or a wall switch 5, it is necessary for the controller 2 and each device to use the same frequency channel. Hereinafter, among the plurality of frequency channels, the channel used in the wireless communication 11 is referred to as a used channel.

As shown in FIG. 6, each frequency channel corresponds to an address. Hereinafter, the frequency channel may be referred to as an address.

The initial value of the channel used is 33. That is, when the address is not set, the controller 2, the lighting fixture 3, and the lighting control device are in the state of address 0. The values shown in FIG. 6 are examples of address and frequency channel values.

FIG. 7 is a sequence diagram illustrating a method for collectively setting addresses according to the first embodiment. First, turn on the power of the controller 2, the lighting fixture 3, and the lighting control device that you want to set to the same address. Here, as the lighting fixture 3, the power of the lighting fixtures 3-1 and 3-2 is turned on. Further, the power of the sensor 4 and the wall switch 5 is turned on as the lighting control device.

At this time, the address is an initial value and becomes address 0. In addition, addresses other than address 0 can be used from 1 to 10. The worker sends an address batch setting command to the controller 2 in order to set the address. The address batch setting command is transmitted from the setting device 6 by infrared communication.

When the controller 2 receives the address batch setting command, it switches the channels used in order for addresses 1 to 10 so that it can receive radio signals in order for addresses 1 to 10. As a result, the controller 2 determines whether or not to receive the radio signal of the other control system when the frequency channel is set as the used channel for each of the plurality of frequency channels.

At this time, the controller 2 receives, for example, a signal for a controller of another control system to dimming and control the terminal device of the control system. Controllers of other control systems, for example, periodically broadcast dimming control signals to terminal devices of the same system.

At this time, the controller 2 switches the used channel at an interval equal to or longer than the communication interval of the other control system, and determines whether or not to receive the radio signal for each of the plurality of frequency channels. For example, when each controller periodically transmits a dimming control signal once every 0.5 seconds, the receivable state is maintained for 0.5 seconds or more for one frequency channel. As a result, the controller 2 can determine the address used by another controller depending on whether or not the radio signal is received.

The controller 2 selects one frequency channel from the frequency channels for which no radio signal has been received. The frequency channel selected here is called a selected channel. The controller 2 sets the selected channel to the channel used in the wireless communication 11. That is, the controller 2 selects the address to be used from the unused addresses. The controller 2 may select an address to be used in numerical order from among unused addresses. That is, among the unused addresses, the one with the smallest address number or the one with the largest address number may be selected as the address to be used.

Further, the controller 2 may perform wireless communication with the terminal device by using the frequency channel that has the least interference with the frequency channel that received the radio signal among the frequency channels that did not receive the radio signal as the used channel. .. The controller 2 compares, for example, the received powers of unused channels and selects a channel with less interference.

In the example of FIG. 7, it is assumed that the selected channel is address 1. The controller 2 transmits the selected channel to the terminal device. The controller 2 broadcasts the selected channel to a plurality of terminal devices. That is, the controller 2 broadcasts an address setting signal to each device at address 0. The address setting signal includes information on the address 1 which is the selected channel.

The terminal device sets the selected channel transmitted from the controller 2 to its own channel. When the terminal device receives the address setting signal, it stores the address 1 in its own address storage unit. The controller 2 also stores the address 1 in the address storage unit 22. After that, the controller 2 and the terminal device perform wireless communication at the address 1.

The controller 2 periodically broadcasts a dimming control signal to the address 1. As a result, the terminal device is controlled. The lighting fixtures 3-1 and 3-2 are dimmed and controlled according to the dimming control signal.

The controller 2 according to the present embodiment sets all usable frequency channels to the channels to be used in order. The controller 2 wirelessly communicates with the terminal device by using the selected channel selected from the frequency channels for which the radio signal has not been received among the plurality of frequency channels as the channel to be used.

As described above, in the present embodiment, the controller 2 determines the frequency channel used in the other control system, and automatically selects the channel used in wireless communication from the unused frequency channel. Therefore, the frequency channel to be used can be easily selected. In particular, in the present embodiment, it is not necessary to send and receive a beacon for searching for a peripheral controller. Therefore, the address can be selected without affecting the dimming control wireless communication.

Further, when the frequency channel is manually set by a DIP (Dual In-line Package) switch or the like, it may take time and effort, especially when the number of devices is large. Also, when setting the address manually, there is a possibility that the address number will be set incorrectly. Further, when resetting the address, for example, it may be necessary to lower the device installed on the ceiling and install the device again after the reset.

On the other hand, in the present embodiment, the controller 2 automatically transmits the selected channel to the terminal device. The terminal device automatically sets the received selected channel as the channel used for wireless communication. Therefore, the frequency channel of the terminal device can be easily set. In addition, it is possible to prevent an address setting error. In particular, this embodiment is effective in a lighting control system in which it is assumed that a large number of lighting fixtures 3 and lighting control devices are provided in the control system 1.

The controller 2 of the present embodiment determines whether or not to receive a radio signal when the frequency channel is set as the channel to be used for each of the plurality of frequency channels in response to the channel setting command transmitted by the setter 6. Determined. Not limited to this, the controller 2 may perform the above address setting operation in response to a signal from, for example, the wall switch 5.

FIG. 8 is a sequence diagram illustrating a method of adding a terminal device according to the first embodiment. The procedure for adding a device to the address used is shown according to the sequence of FIG. In FIG. 8, the address 1 is set in the controller 2 and the lighting fixtures 3-1 and 3-2. A new lighting fixture 3-3 is added to this state.

First, turn on the power of the lighting fixture 3-3 to be added. At this time, the address of the lighting fixture 3-3 is the initial value of address 0. The operator uses the setting device 6 to transmit an address addition command to the controller 2 by infrared communication.

When the controller 2 receives the address addition command, the controller 2 temporarily sets the address of the controller 2 to the address 0. Next, the controller 2 broadcasts an address setting signal to the terminal device at address 0. The address setting signal includes information on the address 1 which is the selected channel. When the luminaire 3-3 receives the information of the address 1, it stores the address 1 in its own address storage unit 32. Further, the controller 2 returns the channel used by the controller 2 to the address 1.

In this way, the controller 2 returns the channel used by the controller 2 to the initial value from the state in which the selected channel is set for the channel used by the controller 2 and the terminal device, and transmits the selected channel to the other terminal device. As a result, the selected channel can be notified to other terminal devices whose channel is initially used. Therefore, the selected channel can be set as the channel used by other terminal devices.

FIG. 9 is a sequence diagram illustrating a method of setting an address in the selected terminal device according to the first embodiment. In FIG. 7, all the devices are collectively set to one address. Not limited to this, it is also possible to select a device for setting an address. A method of selecting a target device and setting an address will be described according to the sequence of FIG.

First, the power of the controller 2, the lighting fixture 3, and the lighting control device is turned on. At this time, the address of each device becomes the initial value of address 0. The controller 2 at address 0 broadcasts the device ID monitor signal to the terminal device at address 0. The device ID monitor signal is a signal for acquiring a unique ID of each terminal device. The unique ID of the terminal device is called a device ID. The controller 2 may periodically transmit the device ID monitor signal.

When the terminal device receives the device ID monitor signal, the terminal device responds to the controller 2 with the device ID owned by the terminal device. In this way, the controller 2 monitors the device IDs of the plurality of terminal devices.

The operator uses the setter 6 to send a device list request to the controller 2 in order to select the device for which the address is to be set. When the controller 2 receives the device list request, it responds with the list of device IDs held by the controller 2. The operator selects the target device for address setting with the setting device 6 and transmits it to the controller 2 as an address selection setting command. In this way, the setting device 6 notifies the controller 2 of the terminal device for which the address is to be set based on the device ID.

In the example of FIG. 9, the lighting fixture 3-2 and the sensor 4 are the target devices. When the controller 2 receives the address selection setting command, as described with reference to FIG. 7, the controller 2 switches the channels used in order for addresses 1 to 10 so that the radio signals can be received in order for addresses 1 to 10. As a result, the controller 2 determines the unused address and selects the selected channel from the unused address.

Here, the selected channel is set to address 1. The controller 2 unicasts the selected channel to a predetermined terminal device among the plurality of terminal devices. The predetermined terminal device is the target device notified by the address selection setting command from the setting device 6. The controller 2 transmits the selected channel to the terminal device notified from the setting device 6.

When the target device receives the information of the address 1, the target device stores the address 1 in its own address storage unit. Further, the controller 2 stores the address 1 in its own address storage unit 22. As a result, the controller 2 and the target device perform wireless communication at the address 1. The controller 2 periodically broadcasts a dimming control signal to the address 1. As a result, the controller 2 controls the target device.

FIG. 10 is a sequence diagram illustrating a method of setting a system ID according to the first embodiment. When all the addresses 1 to 10 are used, the control system 1 can be further added by assigning an ID unique to the control system 1. The ID unique to the control system 1 is called a system ID. As a result, a plurality of control systems 1 can be constructed with the same address.

The method of setting the system ID will be described according to the sequence of FIG. It is assumed that the controller 2, the lighting fixture 3, and the lighting control device communicate with each other at the address 1. The operator uses the setting device 6 to transmit a system ID setting command to the controller 2. When the controller 2 receives the system ID setting command, the controller 2 generates a system ID from the unique ID owned by the controller 2 itself. The system ID may correspond to, for example, the device ID of the controller 2.

The controller 2 broadcasts the system ID setting signal to the lighting fixture 3 and the lighting control device having the same address. The system ID setting signal includes information on the system ID. When the terminal device receives the system ID information, it stores the system ID in its own address storage unit. Further, the controller 2 stores the system ID in the address storage unit 22.

After that, the controller 2 and the terminal device perform wireless communication only by a wireless signal having the same address and the same system ID. That is, the terminal device processes the signal when the frequency channel of the signal transmitted by the controller 2 is the channel used by the terminal device and the signal is addressed to the system ID stored by the terminal device.

As a result, the controller 2 can control the terminal device for which the system ID is set by using the same address as other systems.

The type of terminal device shown in FIG. 1 is an example. Other types of terminal devices may be added to the control system 1 depending on the application. Further, some terminal devices shown in FIG. 1 may be deleted. The control system 1 may include at least one terminal device. Further, the control system 1 may be a system that controls not only the lighting fixture 3 but also any device. Also in this case, according to the present embodiment, the frequency channel used in the control system can be easily selected.

The technical features described in this embodiment may be used in combination as appropriate.

1 Control system, 2 Controller, 3, 3-1 to 3-n Lighting equipment, 4 Sensor, 5 Wall switch, 6 Setting device, 10 Infrared wireless communication, 11 Wireless communication, 21 Control unit, 22 Address storage unit, 23 Wireless communication unit, 24 infrared communication unit, 25 person detection sensor unit, 26 brightness sensor unit, 27 LED status display unit, 28 power supply unit, 31 control unit, 32 address storage unit, 33 wireless communication unit, 34 LED light source unit, 35 LED control unit, 38 power supply unit, 41 control unit, 42 address storage unit, 43 wireless communication unit, 44 infrared communication unit, 45 person detection sensor unit, 46 brightness sensor unit, 47 LED status display unit, 48 power supply unit, 51 Control unit, 52 Address storage unit, 53 Wireless communication unit, 54 Switch input unit, 57 LED status display unit, 58 Power supply unit

Claims (13)

With one or more terminal devices,
For each of the plurality of frequency channels, when the frequency channel is set as the channel used for wireless communication, it is determined whether or not to receive a radio signal of another control system, and among the plurality of frequency channels, the said A controller that wirelessly communicates with the terminal device using the selected channel selected from the frequency channels for which no wireless signal was received as the channel used.
A control system characterized by being equipped with. The controller transmits the selected channel to the terminal device.
The control system according to claim 1, wherein the terminal device sets the selected channel transmitted from the controller to its own channel to be used. The controller is characterized in that it switches the channels used at intervals equal to or greater than the communication interval of the other control system, and determines whether or not to receive the radio signal for each of the plurality of frequency channels. The control system according to 1 or 2. The controller performs wireless communication with the terminal device by using the frequency channel that has the least interference with the frequency channel that received the radio signal among the frequency channels that did not receive the radio signal as the used channel. The control system according to any one of claims 1 to 3, wherein the control system is characterized. Equipped with a plurality of the terminal devices
The control system according to any one of claims 1 to 4, wherein the controller broadcasts the selected channel to the plurality of terminal devices. Equipped with a plurality of the terminal devices
The control system according to any one of claims 1 to 4, wherein the controller transmits the selected channel to a predetermined terminal device among the plurality of terminal devices by unicast. The controller is characterized in that the selected channel is set to the used channel of the controller and the terminal device, the selected channel is returned to an initial value, and the selected channel is transmitted to another terminal device. The control system according to any one of claims 1 to 6. The controller transmits the system ID to the terminal device,
Claims 1 to 7 include that the terminal device processes the signal when the frequency channel of the signal transmitted by the controller is the channel used and the signal is addressed to the system ID. The control system according to any one of the above. A setting device for transmitting a channel setting command to the controller is provided.
The controller is characterized in that, in response to the channel setting command, it is determined whether or not to receive the radio signal when the frequency channel is set to the used channel for each of the plurality of frequency channels. The control system according to any one of claims 1 to 8. The controller is provided with a setting device for notifying the predetermined terminal device.
The control system according to claim 6, wherein the controller transmits the selected channel to the terminal device notified from the setting device. The controller monitors the device IDs of the plurality of terminal devices, and the controller monitors the device IDs of the plurality of terminal devices.
The control system according to claim 10, wherein the setting device notifies the controller of a predetermined terminal device based on the device ID. The control system according to any one of claims 1 to 11, wherein the terminal device includes a lighting fixture. With the communication unit that performs wireless communication,
For each of the plurality of frequency channels, when the frequency channel is set as the channel to be used in the wireless communication, it is determined whether or not the communication unit receives a radio signal of another control system, and the plurality of frequency channels are determined. A control unit that wirelessly communicates with a terminal device via the communication unit using a selected channel selected from the frequency channels for which the radio signal was not received among the frequency channels as the used channel.
A controller characterized by being equipped with.

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