JP2015115653A - Communication system and communication terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication system capable of performing a communication with high immediacy while transmitting information of relatively large data amount, and a communication terminal used as a slave unit in the communication system.SOLUTION: A slave unit 2 includes: a first communication section 21 that performs a communication with a master unit 1 using a transmission signal; a second communication section 22 that performs a communication with the master unit 1 using a superposition signal superposed with the transmission signal; and a control section 23. In a first reply band following the a transmission band in which a data not to be replied is received, the control section 23 controls the first communication section 21 not to transmit any response data and controls the second communication section 22 to transmit a superposition signal to the master unit 1.

Description

  The present invention generally relates to a communication system and a communication terminal, and more particularly, to a communication system including a parent device that repeatedly transmits a transmission signal to a communication line and a child device that communicates with the parent device, and a child of the communication system. The present invention relates to a communication terminal used as a machine.

  2. Description of the Related Art Conventionally, communication systems in which a parent device (transmission unit) and a plurality of child devices (communication terminals) are connected to a communication line and communication is performed between each child device and the parent device have been widely used. As an example of this type of communication system, the master unit periodically monitors the status of the slave unit, and if there is a change in the slave unit state, the master unit performs another process to handle the status change. There is a system for sending a signal to a slave unit (see, for example, Patent Documents 1 to 3).

  However, the communication system configured as described above is a system used for simple control such as switching on / off of a lighting fixture in response to switching on / off, and the amount of data to be transmitted is relatively small. Few. Therefore, the communication system having the above configuration has a relatively low communication speed and is not suitable for transmitting information having a relatively large amount of data such as an analog amount.

  Therefore, apart from the slave unit (first communication terminal) that performs communication using the transmission signal transmitted from the master unit, the slave unit (second unit) that performs higher-speed communication using the superimposed signal superimposed on the transmission signal. A communication system including a communication terminal has been proposed (see, for example, Patent Document 4). Since the first communication terminal and the second communication terminal share a communication line (transmission path), the system described in Patent Document 4 can be easily realized by adding a slave unit to an existing communication system. In Patent Document 4, first communication terminals communicate with each other via a parent device, and second communication terminals communicate directly with each other via peer-to-peer (P2P) without passing through the parent device.

Japanese Patent No. 1180690 Japanese Patent No. 1195362 Japanese Patent No. 1144477 JP 2009-225328 A

  By the way, in the communication system described in Patent Document 4, the slave as the second communication terminal can only perform communication using the superimposed signal (the signal of the second protocol), and is transmitted like the first communication terminal. Communication using signals is not supported. However, the communication using the superimposed signal can transmit information having a larger amount of data than the transmission signal, but is performed only during a limited period (communication adaptation period) of the transmission signal. May not be able to transmit data, and there is a problem of lack of immediacy.

  The present invention has been made in view of the above-mentioned reasons, and is a communication system capable of highly-immediate communication while supporting transmission of information having a relatively large amount of data, and communication used as a slave unit in the communication system The purpose is to provide a terminal.

  The communication system of the present invention includes a master unit that repeatedly transmits a transmission signal to a communication line and a slave unit that communicates with the master unit, and the master unit and the slave unit are electrically connected to the communication line. In the communication system, the transmission signal is divided into a plurality of sections in the time axis direction for each frame, and transmission data is transmitted from the master unit to the slave unit in the plurality of sections. Including a transmission band and a reply band that is a time slot for receiving return data from the slave unit at the master unit. The slave unit communicates with the master unit using the transmission signal. A communication unit, a second communication unit that communicates with the base unit using a superimposed signal superimposed on the transmission signal, a control unit that controls the first communication unit and the second communication unit, And the control unit includes the first communication unit in the transmission band. The first communication unit is controlled so that the return data is not transmitted in the first reply band after the transmission band when the return-unnecessary data which is the transmission data is received. Is configured to control the second communication unit so that the superimposed signal is transmitted to the base unit in the first reply band after the transmission band that has received the return unnecessary data. .

  In this communication system, the slave unit includes a switch that switches an operation state of a load according to an operation input, and a display unit that switches a display state according to the operation state of the load. It is desirable to include data indicating the display state of the display unit.

  In this communication system, the control unit controls the second communication unit so that handset information indicating the state of the handset is transmitted to the base unit in the reply band using the superimposed signal Is more desirable.

  In this communication system, it is more preferable that the return-unnecessary data includes a dummy weight including data irrelevant to the operation of the slave unit.

  In this communication system, the slave unit is configured to detect at least one of the number of people and the position of the person in the monitoring area, and whether or not there is a person in the monitoring area in the detection result of the detecting unit. A determination unit that determines whether the signal is on or off by using the transmission signal from the first communication unit, and transmitting the data representing the determination result of the determination unit from the second communication unit. It is more desirable that data representing a detection result of the detection unit is transmitted using a signal.

  In this communication system, the transmission signal includes an interrupt band for detecting the interrupt signal from the slave unit by the master unit in the plurality of sections, and the master unit includes the interrupt band. When the interrupt signal is detected at, the address search data is transmitted as the transmission data in the first transmission band after the interrupt band, and the interrupt signal is transmitted in the first reply band after the transmission band. The return unit is configured to receive the return data from the slave unit that is a transmission source, and the control unit is configured to receive the base unit in the first reply band after the transmission band that has received the address search data. It is more desirable that the second communication unit be controlled so as to prohibit transmission of the superimposed signal.

  A communication terminal of the present invention includes a master unit that repeatedly transmits a transmission signal to a communication line, and a slave unit that communicates with the master unit, and the master unit and the slave unit are electrically connected to the communication line. The transmission signal is divided into a plurality of sections in the time axis direction for each frame, and the plurality of sections include a transmission band for transmitting transmission data from the master unit to the slave unit, and the slave unit A communication terminal used as the slave unit in a communication system including a reply zone which is a time slot for receiving return data from the base unit, and communicates with the base unit using the transmission signal Control for controlling the first communication unit, the second communication unit that communicates with the base unit using the superimposed signal superimposed on the transmission signal, and the first communication unit and the second communication unit The control unit has a first communication unit in front of the control unit. When the return unnecessary data which is specific transmission data in the transmission band is received, the first communication unit is controlled so that the return data is not transmitted in the first reply band after the transmission band, The first communication unit is configured to control the second communication unit so that the superimposed signal is transmitted to the base unit in the first reply band after the transmission band in which the return unnecessary data is received. It is characterized by.

  The present invention includes a first communication unit in which a slave unit performs communication using a transmission signal, and a second communication unit that performs communication using a superimposed signal superimposed on the transmission signal. In the first reply band after the received transmission band, the second communication unit is controlled so that the superimposed signal is transmitted to the parent device. Therefore, the present invention has an advantage that communication with high immediacy is possible while supporting transmission of information having a relatively large amount of data.

1 is a block diagram illustrating a schematic configuration of a communication system according to a first embodiment. FIG. 6 is an explanatory diagram of an operation of the communication system according to the first embodiment. FIG. 6 is an explanatory diagram of an operation of the communication system according to the first embodiment. 6 is a block diagram illustrating a schematic configuration of a communication system according to a first modification of the first embodiment. FIG. 6 is an explanatory diagram of an operation of a communication system according to Embodiment 2. FIG.

(Embodiment 1)
As shown in FIG. 1, the communication system 100 according to the present embodiment includes a parent device 1 and a child device 2, and the parent device 1 and the child device 2 are electrically connected to a communication line 10. is there. Base unit 1 repeatedly transmits a transmission signal to communication line 10. The slave unit 2 communicates with the master unit 1.

  The transmission signal is divided into a plurality of sections in the time axis direction for each frame. As shown in FIG. 2, the plurality of sections include a transmission band 103 for transmitting transmission data from the parent device 1 to the child device 2, and a time slot for receiving return data from the child device 2 by the parent device 1. A reply band 104 is included.

  The subunit | mobile_unit 2 has the 1st communication part 21, the 2nd communication part 22, and the control part 23, as shown in FIG. The first communication unit 21 communicates with the parent device 1 using the transmission signal. The 2nd communication part 22 communicates with the main | base station 1 using the superimposition signal superimposed on the said transmission signal. The control unit 23 controls the first communication unit 21 and the second communication unit 22.

  When the first communication unit 21 receives return unnecessary data that is specific transmission data in the transmission band 103, the control unit 23 does not transmit the return data in the first reply band 104 after the transmission band 103. Thus, the first communication unit 21 is controlled. In addition, the control unit 23 performs the second communication so that the superimposed signal is transmitted to the base unit 1 in the first reply band 104 after the transmission band 103 in which the first communication unit 21 has received the return unnecessary data. This is a configuration for controlling the unit 22.

  According to this configuration, the communication system 100 according to the present embodiment uses the first communication unit 21 in which the slave unit 2 communicates with the master unit 1 using the transmission signal, and the superimposed signal superimposed on the transmission signal. And a second communication unit 22 that communicates with the base unit 1. That is, since the handset 2 can perform both communication using a transmission signal and communication using a superimposition signal with the base unit 1, it can handle transmission of information with a relatively large amount of data. High-immediate communication is possible.

  Moreover, the control unit 23 of the handset 2 controls the first communication unit 21 so that the return data is not transmitted in the first reply band 104 after the transmission band 103 that has received the return unnecessary data, and the superimposed signal is transmitted. The second communication unit 22 is controlled so as to be transmitted to the parent device 1. That is, in the first reply band 104 after the transmission band 103 in which the return unnecessary data is transmitted, the superimposition signal is transmitted from the slave unit 2 to the master unit 1 without transmitting the return data. Therefore, the subunit | mobile_unit 2 can communicate using a superimposition signal using the return band 104 of a transmission signal, avoiding interference with a transmission signal (return data).

  In addition, the communication terminal according to the present embodiment is used as the slave unit 2 in the communication system 100 in which the master unit 1 and the slave unit 2 are electrically connected to the communication line 10 as described above. As shown in FIG. 1, this communication terminal (child device 2) includes a first communication unit 21, a second communication unit 22, and a control unit 23. The first communication unit 21 communicates with the parent device 1 using the transmission signal. The 2nd communication part 22 communicates with the main | base station 1 using the superimposition signal superimposed on the said transmission signal. The control unit 23 controls the first communication unit 21 and the second communication unit 22.

  As described above, when the first communication unit 21 receives return-unnecessary data that is specific transmission data in the transmission band 103 as described above, the control unit 23 transmits the data in the first reply band 104 after the transmission band 103. The first communication unit 21 is controlled so that the return data is not transmitted. Further, as described above, the control unit 23 causes the superimposition signal to be transmitted to the base unit 1 in the first reply band 104 after the transmission band 103 in which the first communication unit 21 has received the return unnecessary data. Further, the second communication unit 22 is controlled.

  Hereinafter, the communication system 100 according to the present embodiment and the communication terminal used as the slave unit 2 in the communication system 100 will be described in detail.

  In the present embodiment, the communication system 100 includes a master unit 1 and a plurality of slave units 2, and the master unit 1 and the plurality of slave units 2 are electrically connected to a two-wire communication line 10. It is connected. In the example of FIG. 1, the communication system 100 includes two slave units 2 including a first slave unit 201 and a second slave unit 202. Hereinafter, when the first slave unit 201 and the second slave unit 202 are not particularly distinguished, they are collectively referred to as “slave unit 2”.

  In the communication system 100 according to the present embodiment, each slave unit 2 receives a transmission signal (first protocol signal) transmitted through the communication line 10 and a superimposed signal (second protocol signal) superimposed on the transmission signal. It communicates with the base unit 1 properly.

  FIG. 1 shows an example in which the communication system 100 is applied to a lighting system for controlling the lighting fixture 3 in an office building or the like. In this example, one master unit 1 is provided in each area (for example, floor), and a plurality of slave units 2 are connected to the communication line 10 connected to each master unit 1.

  Moreover, the main | base station 1 is connected to the energy-saving controller (not shown) used as the high-order apparatus. The energy saving controller is provided for each area (for example, floor), and comprehensively monitors and controls an air conditioner (not shown) in addition to the lighting system to which the communication system is applied. The energy saving controllers in a plurality of areas are connected to a personal computer having a browser function via a network such as the Internet or a LAN (Local Area Network), and can be monitored from the personal computer.

  The slave unit 2 that is a communication terminal is classified into two types: a monitor slave unit that monitors user operation input and a control slave unit that controls the energization state of the lighting fixture 3. In the present embodiment, the first slave unit 201 is a monitoring slave unit, and the second slave unit 202 is a control slave unit. Specifically, the first slave unit 201 includes a switch 24 that switches the operation state of the load (relay 26) in accordance with an operation input, and the second slave unit 202 is electrically connected to the lighting fixture 3. The relay 26 is provided. That is, the second slave unit 202 includes the relay 26 as a load whose operation state is switched according to the operation of the first slave unit 201, and the lighting device 3 is turned on / off according to the on / off of the relay 26. To do.

  Furthermore, in this embodiment, the 1st subunit | mobile_unit 201 has the display part 25 from which a display state switches according to the operation state of load (relay 26). Here, the display unit 25 is configured by using a light emitting diode, and displays the operation state of the load by the emission color. For example, the display unit 25 emits green light when the relay 26 is off, and emits red light when the relay 26 is on.

  In the present embodiment, the first slave unit (monitoring slave unit) 201 and the second slave unit (control slave unit) 202 are connected to the same communication line 10 one by one. Will be described as an example.

  Note that at least one first slave unit 201 and two second slave units 202 may be provided, and a plurality of each may be provided. Further, here, the first slave unit 201 is integrated with the switch 24 by being housed in a common housing with the switch 24. However, the first slave unit 201 is not limited to this configuration, and may be separated from the switch 24. Good. Similarly, although the 2nd subunit | mobile_unit 202 is integrated with the relay 26 here, the separate body from the relay 26 may be sufficient.

  The base unit 1 is a so-called transmission unit and has a function of repeatedly transmitting a transmission signal to the two-wire communication line 10.

  The plurality of slave units 2 are connected in parallel to the master unit 1 via the communication line 10. The master unit 1 and the slave unit 2 are time-division multiplex transmission systems in which data transmission from the master unit 1 to the slave unit 2 and data transmission from the slave unit 2 to the master unit 1 are performed in a time division manner using transmission signals. Build up.

  As shown in FIG. 1, base unit 1 includes transmission unit 11, superimposition unit 12, (base unit side) control unit 13, and storage unit 14. The transmission unit 11 repeatedly transmits a transmission signal to the communication line 10 and communicates with the slave unit 2 using the transmission signal. The superimposing unit 12 communicates with the child device 2 using a superimposing signal described later. The control unit 13 controls the operations of the transmission unit 11 and the superposition unit 12. In the present embodiment, the main unit 1 has a microcomputer as a main component, and implements the functions of each unit by executing a program stored in the storage unit 14. The program may be provided through an electric communication line or may be provided by being stored in a storage medium such as a memory card.

  As shown in FIG. 1, the first slave unit 201 and the second slave unit 202 include an interface unit in addition to the first communication unit 21, the second communication unit 22, and the (slave unit side) control unit 23. 27 and the memory 28 are provided as a common configuration. In the first slave unit 201, the switch 24 is electrically connected to the interface unit 27, and in the second slave unit 202, the relay 26 is electrically connected to the interface unit 27.

  First communication unit 21 communicates with base unit 1 using a transmission signal. The 2nd communication part 22 communicates with the main | base station 1 using the superimposition signal mentioned later. The control unit 23 controls operations of the first communication unit 21, the second communication unit 22, and the interface unit 27. Here, the subunit | mobile_unit 2 has memorize | stored the own address allocated separately previously in each memory 28. FIG.

  In this embodiment, the subunit | mobile_unit 2 implement | achieves the function of each part by having a microcomputer as a main structure and running the program memorize | stored in the memory 28. FIG. The program may be provided through an electric communication line or may be provided by being stored in a storage medium such as a memory card.

  The master unit 1 stores in the storage unit 14 a control table in which the monitoring slave unit (first slave unit 201) 2 and the control slave unit (second slave unit 202) 2 are associated by an address. ing. However, for example, when the monitoring slave unit 2 has a plurality of circuit switches, each of the plurality of circuit switches in the slave unit 2 cannot be distinguished only by a terminal address unique to the slave unit 2. That is, all the switches of the plurality of circuits in the handset 2 correspond to the terminal address unique to the handset 2, and the only switch actually operated cannot be specified only by the terminal address.

  Therefore, in the monitoring slave unit 2, a load number is assigned to each switch so that the only actually operated switch can be specified, and an address with the load number added after the terminal address of the slave unit 2 is assigned. Used as an address (identifier) unique to the switch. Similarly, when the control slave unit 2 has a plurality of relays, a load number is assigned to each relay in the control slave unit 2 and an address in which the load number is added after the terminal address of the slave unit 2 Is an address (identifier) unique to the relay. In the control table, the switch-specific address and the relay-specific address are associated one-to-one or one-to-many.

  Below, the structure for the main | base station 1 and the subunit | mobile_unit 2 to communicate using a transmission signal first is demonstrated.

  Base unit 1 repeatedly transmits a time division transmission signal to communication line 10. As shown in FIG. 2, the transmission signal has a voltage waveform in a format divided into a plurality of sections in the time axis direction for each frame. That is, the transmission signal has seven sections (periods) of a spare interrupt band 101, a spare band 102, a transmission band 103, a reply band 104, an interrupt band 105, a short-circuit detection band 106, and a pause band 107. Is a time-division multiplexed signal of ± 24V.

  The spare interrupt band 101 is a period for the parent device 1 to detect the presence or absence of the secondary interrupt, and the spare band 102 is a period set to match the polarity of the waveform to the interrupt band 105 and the short-circuit detection band 106. The transmission band 103 is a period for the master unit 1 to transmit data to the slave unit 2. A reply band 104 is a time slot in which the base unit 1 receives return data from the handset 2, and an interrupt band 105 is a period for the base unit 1 to detect the presence or absence of an interrupt signal to be described later. A band 106 is a period for the base unit 1 to detect a short circuit. A pause zone 107 is a period used for data processing by a microcomputer or the like.

  Note that, when an interrupt signal is detected in the interrupt band 105, the base unit 1 communicates with the slave unit 2 that has generated the interrupt signal in the first transmission band 103 and the reply band 104 thereafter. For this reason, in this embodiment, each period starting from the interrupt band 105 and ending in the reply band 104 in the transmission signal is defined as one frame (F1, F2,...). However, since the spare interrupt band 101 and the spare band 102 are originally sections set as start pulses and the interrupt band 105 and the short-circuit detection band 106 are end pulses, the spare interrupt band 101 to the short-circuit detection band 106 are set. The period up to may be one frame. In this case, the pause band 107 is an interval between frames of the transmission signal, and the transmission signal is divided into a plurality of sections in the time axis direction for each period obtained by adding an interval to one frame.

  The base unit 1 normally transmits a transmission signal whose mode data is in the normal mode, and periodically changes the address data included in the transmission band 103 of the transmission signal to sequentially access the handset 2. I do. At the time of constant polling, the handset 2 whose address data included in the transmission band 103 matches its own address receives the data included in the transmission band 103, and the first reply band (of the same frame) thereafter At 104, the return data is transmitted to base unit 1. Here, the subunit | mobile_unit 2 transmits return data by the signal (signal sent by short-circuiting the communication line 10 via a suitable low impedance) synchronized with the reply band 104 of the transmission signal. In addition, the power supply of the internal circuit of the subunit | mobile_unit 2 is supplied by rectifying and stabilizing the transmission signal transmitted via the communication line 10. FIG. However, the power supply to the slave unit 2 is not limited to this configuration, and may be performed by a method (local power supply method) in which commercial power is supplied by rectifying and stabilizing each of the slave units 2.

  On the other hand, when the monitoring slave unit 2 detects an operation input to the switch 24, the monitoring slave unit 2 generates an interrupt signal in synchronization with the interrupt band 105 of the transmission signal. When base unit 1 detects an interrupt signal in interrupt band 105, base station 1 sends return request data for requesting return of the return data in order to receive return data from the transmission source of this interrupt signal in reply band 104. 103. Specifically, when the base unit 1 detects an interrupt signal, it transmits return request data composed of the upper bits of the address in the transmission band 103 of the transmission signal, and changes the address (upper bit) while periodically changing the address. Perform a search. If the address (upper bit) in the return request data matches the upper bit of its own address, the slave unit 2 that has generated the interrupt signal has the lower bit of its address in the first reply band 104 thereafter. Is sent to the base unit 1 as return data. Thereby, the main | base station 1 can acquire the address (low-order bit) of the subunit | mobile_unit 2 which generate | occur | produced the interruption signal.

  By the way, in the communication system 100 according to the present embodiment, the slave unit 2 is configured to be communicable with the master unit 1 using not only the transmission signal but also a superimposed signal superimposed on the transmission signal. Below, the structure for the main | base station 1 and the subunit | mobile_unit 2 to communicate using a superimposition signal is demonstrated.

  The superimposed signal is a signal having a sufficiently high frequency compared to the transmission signal, and has a sufficiently large amount of data that can be transmitted per frame (of the transmission signal). For this reason, the communication using the superimposed signal can increase the communication speed compared to the communication using the transmission signal, and is suitable for transmitting information having a relatively large amount of data such as an analog amount. Therefore, in the present embodiment, the slave unit 2 performs transmission of slave unit information other than on / off of the switch 24 using the superimposed signal. The slave unit information here is information including at least one of the number of operations of the switch 24, the communication status with the master unit 1, the software version of the master unit 1, and the software version of the slave unit 2. It is.

  Therefore, the first slave unit 201 can transmit information such as the number of operations of the switch 24 to the master unit 1 using the superimposed signal. For example, base unit 1 can transmit information for controlling relay 26 of second handset 202 to second handset 202 using the superimposed signal in accordance with information such as the number of operations of switch 24. Note that the slave unit information transmitted from the slave unit 2 to the master unit 1 by the superimposed signal may be information indicating the state of the slave unit 2, and the number of operations of the switch 24, the communication status with the master unit 1, and the software Other appropriate information is not limited to this version. Moreover, the main | base station 1 may perform transmission of the subunit | mobile_unit information as mentioned above with a superimposition signal. The slave unit information here is information other than whether the switch 24 is on or off. The number of operations of the switch 24, the communication status with the master unit 1, the software version of the master unit 1, and the slave unit 2 Information including at least one of software versions.

  Here, the subunit | mobile_unit 2 has a function which monitors a transmission signal in the 1st communication part 21, and analyzes the data transmission condition (henceforth "state") of a transmission signal. The subunit | mobile_unit 2 judges whether it exists in the superimposable zone suitable for superimposition of a superimposition signal from the analysis result of a state, and it becomes a transmission signal in the 2nd communication part 22 at the timing judged to be a superimposable zone. Superimpose the superimposed signal. That is, the slave unit 2 is configured to communicate in synchronization with a transmission signal transmitted from the master unit 1 to the communication line 10. Therefore, base unit 1 can use the transmission signal as a synchronization signal, and does not need to send out a synchronization signal only for synchronization in communication using the superimposed signal.

  In this embodiment, the subunit | mobile_unit 2 is used for transmission of a superimposition signal by making the reply band 104 into a superimposable band among transmission signals. The reply band 104 does not affect the communication of the first protocol even if the superimposed signal is superimposed, and the superimposed signal is not easily influenced by the transmission signal. Moreover, the reply band 104 has a longer time during which the voltage of the transmission signal is kept constant, and the ratio of the transmission signal to one frame is larger than that of the spare interrupt band 101, the spare band 102, and the pause band 107. It is suitable for superposition of superposition signals.

  In other sections (such as the transmission band 103), the time during which the transmission signal is stable at the high level or the low level is relatively short, and if the superimposed signal is superimposed, communication of the first protocol is likely to be affected. In addition, when a superimposed signal is superimposed on the other section, the superimposed signal is also easily affected by a signal (interrupt signal or transmission data) exchanged between the parent device 1 and the child device 2. Therefore, in the present embodiment, the section other than the reply band 104 is a section that is not used for superimposing the superimposed signal (hereinafter referred to as “non-superimposed band”).

  However, the reply band 104 is a section that is originally used for transmission of return data from the child device 2 to the parent device 1. Therefore, the slave unit 2 is configured to select a reply band 104 that does not transmit return data from the reply band 104 and use the reply band 104 as a superimposable band for transmission of a superimposed signal. That is, the reply band 104 is basically used for transmission of return data, but in the communication sequence between the parent device 1 and the child device 2, only transmission data transmission from the parent device 1 to the child device 2 is performed. There is a reply band 104 in which return data is not transmitted from the slave unit 2 to the master unit 1. The subunit | mobile_unit 2 avoids interference with the return data in the reply band 104, and a superimposition signal by transmitting a superimposition signal according to the reply band 104 in which transmission of return data is not performed in this way.

  In the present embodiment, when the first communication unit 21 receives return-unnecessary data that is specific transmission data in the transmission band 103, the control unit 23 returns in the first reply band 104 after the transmission band 103. The first communication unit 21 is controlled so that data is not transmitted. The control unit 23 controls the second communication unit 22 so that the superimposed signal is transmitted to the base unit 1 in the first reply band 104 after the transmission band 103 in which the first communication unit 21 received the return unnecessary data. To do.

  More specifically, in the present embodiment, the control unit 23 analyzes the transmission data received by the first communication unit 21 to determine whether the transmission data transmitted in the transmission band 103 is return unnecessary data or return request data. To determine. The return request data is data that the master unit 1 requests the slave unit 2 to transmit return data. On the other hand, the return-unnecessary data is data that the master unit 1 does not request the slave unit 2 to send return data. Based on the determination result, the control unit 23 controls the second communication unit 22 in the first reply band 104 thereafter and transmits the superimposed signal to the base unit 1 if the transmission data is return-free data. .

  Note that the rising and falling periods of the transmission signal are also not suitable for superimposing the superimposed signal due to the influence of harmonic noise or the influence of a transient response accompanying the signal voltage inversion. Therefore, handset 2 determines that the predetermined avoidance time (for example, 300 μs) after the switching (rise) of the sections in the reply band 104 is a non-overlapping band.

  Below, the communication sequence (procedure) of the communication system 100 which concerns on this embodiment is demonstrated with reference to FIG. 2 and FIG. Here, the operation when the first handset 201 receives an operation input from the user to the switch 24 and switches the relay 26 of the second handset 202 from OFF to ON will be described as an example. FIG. 2 is an explanatory diagram illustrating a transmission signal and a superimposed signal superimposed thereon, and FIG. 3 is a sequence diagram illustrating operations of the parent device 1, the first child device 201, and the second child device 202. . In FIG. 3, communication using the superimposed signal is indicated by a thick arrow.

  It should be noted that the time required for a series of processing after the user's operation input to the switch 24 until the operation state of the relay 26 is switched and the display state of the display unit 25 is determined is 15 cycles of the transmission signal (the first 1 frame F1 to 15th frame F15). However, in FIG. 2, only some frames (the first frame F1, the second frame F2, the fourth frame F4, the sixth frame F6, and the seventh frame F7) of the series of processes are illustrated, and other frames are illustrated. Is omitted.

  The first slave unit 201 receives an operation input from the user to the switch 24 and generates an interrupt signal in synchronization with the interrupt band 105 of the first frame F1 of the transmission signal (S1). The base unit 1 that has detected the interrupt signal in the transmission unit 11 switches the mode data included in the transmission band 103 of the transmission signal from the normal mode to the interrupt polling mode. In the interrupt polling mode, the base unit 1 transmits the first return request data composed of the upper bits of the address from the transmission unit 11 in the transmission band 103 of the transmission signal (S2), and the address (upper bits) is cycled. Address search is performed while changing the target. If the address (upper bit) in the return request data matches the upper bit of its own address, the first slave unit 201 that has generated the interrupt signal has its own in the reply band 104 of the first frame F1. The lower bits of the address are transmitted as return data to the base unit 1 (S3). As a result, the base unit 1 receives the address (lower bit) of the first handset 201 that generated the interrupt signal in the first frame F1 at the transmission unit 11 as the first return data.

  When the base unit 1 acquires the address of the handset 2 that has generated the interrupt signal, the base unit 1 designates the address and transmits the address from the transmission unit 11 to the first handset 201 in the transmission band 103 of the second frame F2. Second return request data is transmitted (S4). The second return request data is monitoring request data for requesting monitoring data indicating the state of the slave unit 2. When receiving the monitoring request data, the first slave unit 201 responds to the monitoring request data including the load number of the switch 24 corresponding to the operation input and the on / off status in the reply band 104 of the second frame F2. The return data is transmitted to the base unit 1 (S5).

  When the transmission unit 11 receives the second return data composed of the monitoring data, the base unit 1 transmits the transmission band of the third frame F3 to the second handset 202 corresponding to the monitoring data on the control table. In 103, the first return request data is transmitted from the transmission unit 11 (S6). The first return request data for the second handset 202 is monitoring request data for requesting monitoring data indicating the state of the handset 2. When the second slave unit 202 receives the monitoring request data, in response to this, the master unit uses the monitoring data including whether the relay 26 is turned on or off in the reply band 104 of the third frame F3 as the first return data. 1 (S7).

  When the transmission unit 11 receives the first return data (monitoring data) from the second slave unit 202, the master unit 1 sends the first slave unit 201 to the transmission band 103 of the fourth frame F4. Display control data for switching the display state of the display unit 25 is transmitted from the transmission unit 11 (S8). This display control data is return-unnecessary data that does not require a return data return from the slave unit 2 to the master unit 1.

  When receiving the display control data, the first slave unit 201 switches the display color of the display unit 25 from an off state (for example, green) to an on state (for example, red). However, at this time, the first slave unit 201 only tentatively switches the display state of the display unit 25, and determines the display state of the display unit 25 only after receiving the subsequent confirmation data. Further, the first slave unit 201 transmits the superimposition signal from the second communication unit 22 in the reply band 104 of the fourth frame F4 without transmitting the return data in the first communication unit 21. 1 (S9).

  Base unit 1 transmits second return request data from transmission unit 11 to second handset 202 in transmission band 103 of fifth frame F5 (S10). The second return request data for the second handset 202 is control data for controlling the relay 26 of the handset 2. Upon receiving the control data, the second slave unit 202 switches the relay 26 from OFF to ON in response to this, and sends the second return data to the master unit 1 in the reply band 104 of the fifth frame F5. Transmit (S11). The second return data from the second handset 202 is an ACK (acknowledgment) indicating that the control data has been normally received.

  From the sixth frame F6 to the thirteenth frame F13, the parent device 1 transmits dummy weights from the transmission unit 11 to the first child device 201 in each transmission band 103 (S12, S14). The dummy wait is data that is not related to the operation of the slave unit 2 and is return-free data that does not require return data to be returned from the slave unit 2 to the master unit 1. In the present embodiment, as an example, it is assumed that base unit 1 transmits dummy waits eight times.

  The sequence for transmitting the dummy wait is provided in order to secure the time required for the operation of the relay 26 of the second slave unit 202 and to check the state of the relay 26 after the operation of the relay 26 is completed. ing. In other words, a load such as the relay 26 that involves mechanical operation takes a certain amount of time until the operating state (off, on) completely changes after receiving control data. Is provided. Moreover, in the subunit | mobile_unit 2 which has loads, such as the relay 26, since voltage fluctuation | variation may arise at the timing when the operation state of load changes, time by dummy weight is prevented so that this voltage fluctuation | variation may not influence the next communication. It is desirable to earn.

  When the first slave unit 201 receives the dummy wait in the transmission band 103, the first communication unit 21 does not transmit the return data in the first reply band 104 after that, and the second communication unit 22 transmits a superimposition signal to the base unit 1 (S13, S15). That is, the first slave unit 201 transmits the superimposed signal to the master unit 1 in each reply band 104 from the sixth frame F6 to the thirteenth frame F13.

  In the subsequent 14th frame F14, the base unit 1 transmits the third return request data from the transmission unit 11 in the first transmission band 103 to the second handset 202 (S16). The third return request data for the second handset 202 is monitoring request data for requesting monitoring data indicating the state of the handset 2. When the second slave unit 202 receives the monitoring request data, in response to this, the master unit uses the monitoring data including whether the relay 26 is turned on or off in the reply band 104 of the fifteenth frame F15 as the third return data. 1 (S17).

  When the transmission unit 11 receives the third return data (monitoring data) from the second slave unit 202 in the transmission unit 11, the base unit 1 determines the operation state of the relay 26 (on / off) from the monitoring data, and the display unit 25. Compare with the display status of. At this time, if the operation state of the relay 26 matches the display state of the display unit 25, the base unit 1 transmits to the first handset 201 in the transmission band 103 of the 15th frame F15. The confirmation data for confirming the display state of the display unit 25 is transmitted from the unit 11 (S18). This confirmed data is return-unnecessary data that does not require a return data return from the child device 2 to the parent device 1.

  When receiving the confirmation data, the first slave unit 201 confirms the display color of the display unit 25 in an on state (for example, red). Further, the first slave unit 201 transmits the superimposition signal from the second communication unit 22 in the reply band 104 of the fifteenth frame F15 without transmitting the return data in the first communication unit 21. 1 (S19).

  Further, if the master unit 1 does not match the operation state of the relay 26 determined from the third return data (monitoring data) received from the second slave unit 202 and the display state of the display unit 25, The display state of the display unit 25 is changed according to the operation state of the relay 26.

  That is, base unit 1 changes the display color of display unit 25 to the off state when the display color of display unit 25 is on and relay 26 is off. In this case, the base unit 1 transmits display control data for switching the display state of the display unit 25 to the first slave unit 201 in the transmission band 103 of the 15th frame F15 instead of the fixed data. . Since the display control data is return-unnecessary data that does not require the return data to be returned from the slave unit 2 to the master unit 1, even in this case, the first slave unit 201 returns the reply band of the 15th frame F15. At 104, the superimposed signal is transmitted from second communication unit 22 to base unit 1.

  As described above, the communication system 100 performs a series of processes from the user's operation input to the switch 24 until the display on the display unit 25 is confirmed in 15 cycles from the first frame F1 to the 15th frame F15. Complete. At that time, each time the first slave unit 201 receives the return-unnecessary data from the master unit 1, the first slave unit 201 can transmit the superimposed signal from the second communication unit 22 to the master unit 1 in the reply band 104.

  2 and 3 exemplify the operation when switching the relay 26 of the second slave unit 202 from OFF to ON, control data and display control data are not changed even when the relay 26 is switched from ON to OFF. The communication sequence itself is the same as the above example except for the difference.

  According to the communication system 100 of the present embodiment described above, there is an advantage that communication with high immediacy is possible while supporting transmission of information having a relatively large amount of data. That is, in this communication system 100, the slave unit 2 includes a first communication unit 21 that communicates with the master unit 1 using a transmission signal, and a second communication unit 22 that communicates with the master unit 1 using a superimposed signal. have. Therefore, the slave unit 2 can perform both communication using the transmission signal and communication using the superimposition signal with the master unit 1, while supporting transmission of information with a relatively large amount of data. High-immediate communication is possible.

  Moreover, the control unit 23 of the handset 2 controls the first communication unit 21 so that the return data is not transmitted in the first reply band 104 after the transmission band 103 that has received the return unnecessary data, and the superimposed signal is transmitted. The second communication unit 22 is controlled so as to be transmitted to the parent device 1. That is, the slave unit 2 transmits a superimposition signal in accordance with the return band 104 where the return data is not transmitted, thereby avoiding interference with the transmission signal (return data) in the return band 104 and returning a reply. Communication can be performed using a superimposed signal using the band 104.

  Moreover, the subunit | mobile_unit 2 has the switch 24 which switches the operation state of load (relay 26) according to operation input like this embodiment, and the display part 25 which a display state switches according to the operation state of load. It is preferable. In this case, the return unnecessary data includes data (display control data) instructing the display state of the display unit 25. As a result, the slave unit (first slave unit 201) 2 having the switch 24 and the display unit 25 receives the data indicating the display state of the display unit 25, and uses the reply band 104 to send a superimposed signal. Can be sent.

  Further, as in the present embodiment, the control unit 23 sets the second communication unit 22 so that handset information indicating the state of the handset 2 is transmitted to the base unit 1 in the reply band 104 using the superimposed signal. It is preferable that the configuration be controlled. As a result, the slave unit 2 can efficiently use the superimposed signal to display information with a relatively large amount of data representing the state of the slave unit 2, such as the number of operations of the switch 24, the communication status with the master unit 1, and the software version. Can be sent to the main unit 1.

  Further, the return-unnecessary data may include a dummy weight made up of data irrelevant to the operation of the slave unit 2 as in this embodiment. According to this configuration, when the dummy weight is transmitted from the parent device 1 to the child device a plurality of times, the child device 2 uses the reply band 104 after the dummy weights for the plurality of times. Thus, information having a larger amount of data can be efficiently sent to the base unit 1 using the superimposed signal.

  By the way, as a first modification of the present embodiment, the communication system 100 includes, as shown in FIG. 4, a slave unit (third unit) having a detection unit 29 and a determination unit 30 as a monitoring slave unit 2. You may provide the subunit | mobile_unit 203) 2. The third slave unit 203 includes a detection unit 29 and a determination unit 30 instead of the switch 24 and the display unit 25 of the first slave unit 201. The detection unit 29 detects at least one of the number of people and the position of people in the monitoring area. The determination unit 30 determines whether the detection result is on or off depending on whether or not there is a person in the monitoring area.

  The detection unit 29 includes an image sensor (not shown) that captures the monitoring area, and detects the number of people and the position of the person in the monitoring area from an image obtained by the image sensor. Here, the third slave unit 203 is integrated with the detection unit 29 and the determination unit 30 by being housed in a common housing with the detection unit 29 and the determination unit 30, but the configuration is not limited to this. The unit 29 and the determination unit 30 may be separate.

  The 3rd subunit | mobile_unit 203 transmits the data showing the determination result (a distinction of ON and OFF) of the determination part 30 using the transmission signal from the 1st communication part 21. FIG. The third handset 203 transmits data representing the detection result of the detection unit 29 (at least one of the number of people and the position of people in the monitoring area) using the superimposed signal from the second communication unit 22. Is configured to do.

  Here, the communication sequence between the parent device 1 and the third child device 203 is basically the same as the communication sequence between the parent device 1 and the first child device 201 described above. Description is omitted. However, in the third handset 203, the data transmitted using the superimposed signal is data representing the detection result of the detection unit 29 (at least one of the number of people and the position of people in the monitoring area). Thus, it is different from the first slave unit 201.

  According to the communication system 100 of the first modified example, the master unit 1 receives not only the data indicating whether it is on or off from the slave unit (third slave unit 203) 2, but also the person in the monitoring area. Data representing at least one of the number and the position of the person can also be efficiently collected. Therefore, base unit 1 can determine the load control content according to, for example, the number of people in the monitoring area and the positions of the people. Specifically, in the communication system 100, when a plurality of lighting fixtures 3 are installed in the monitoring area, for example, it is possible to control to turn on only the lighting fixture 3 at a position where a person exists.

  As a second modification of the present embodiment, the control unit 23 of the slave unit 2 predicts in advance the timing at which the first communication unit 21 receives return unnecessary data in the transmission band 103 based on the communication sequence. It may be configured as follows. That is, since the communication sequence between the master unit 1 and the slave unit 2 is determined, it is known in which frame the return unnecessary data is transmitted from the master unit 1 in the transmission signal.

  For example, as described above, in a series of processes from the user's operation input to the switch 24 until the display on the display unit 25 is confirmed, the first slave unit 201 and the master unit 1 are the first. Communication from the frame F1 to the fifteenth frame F15 is performed. In this case, return unnecessary data is transmitted in the fourth frame F4, the sixth frame F6 to the thirteenth frame F13, and the fifteenth frame F15. Therefore, the control unit 23 of the first slave unit 201 uses the user's operation input to the switch 24 as a trigger to set the reply band 104 of the fourth frame F4, the sixth frame F6 to the thirteenth frame F13, and the fifteenth frame F15. The superimposition signal is transmitted to the base unit 1 by using it.

  According to the communication system 100 of the second modified example, the first slave unit 201 does not need to determine whether it is return unnecessary data every time transmission data is received from the master unit 1 in the transmission band 103. The processing load on the control unit 23 is reduced.

  In the present embodiment, a configuration in which the control slave unit (second slave unit 202) 2 having the load (relay 26) has the second communication unit 22 similarly to the monitoring slave unit 2 is illustrated. However, not only this structure but the 2nd communication part 22 may be abbreviate | omitted for the subunit | mobile_unit 2 for control. In other words, the control slave unit 2 only needs to be able to communicate with the master unit 1 using the transmission signal, and the configuration for communication using the superimposed signal can be omitted as appropriate.

(Embodiment 2)
In the communication system 100 of the present embodiment, the transmission signal includes an interrupt band 105 for detecting the interrupt signal from the slave unit 2 by the master unit 1 in the plurality of sections. When the base unit 1 detects the interrupt signal in the interrupt band 105, the base unit 1 transmits address search data as the transmission data in the first transmission band 103 after the interrupt band 105. Furthermore, the base unit 1 is configured to receive the return data from the handset 2 that is the transmission source of the interrupt signal in the first reply band 104 after the transmission band 103.

  Here, in the first reply band 104 after the transmission band 103 that has received the address search data, the control unit 23 controls the second communication unit 22 to prohibit transmission of the superimposed signal to the base unit 1. It is the structure which controls. Hereinafter, the same configurations as those of the first embodiment are denoted by common reference numerals, and description thereof will be omitted as appropriate.

  In short, in the communication system 100 according to the present embodiment, the control unit 23 of the slave unit 2 determines whether or not transmission data received in the transmission band 103 is address search data (hereinafter referred to as “search data”). If the transmission data is search data, transmission of the superimposed signal is prohibited.

  More specifically, in the communication system 100 according to the present embodiment, when interrupt signals are simultaneously generated in a plurality of slave units 2, the slave unit 2 does not transmit return data for transmission data from the master unit 1. A reply band 104 exists. However, in such a reply band 104, there is a possibility that a plurality of slave units 2 that have generated interrupt signals at the same time transmit a superimposed signal at the same time. Prohibit transmission of superimposed signal.

  Hereinafter, a communication sequence of the communication system 100 when an interrupt signal is simultaneously generated in a plurality of slave units 2 and the master unit 1 performs an address search will be described with reference to FIG. Here, the first slave unit 201 whose address is “8-0E” (binary notation “1000-00001110”) and the address “8-0F” (binary notation “1000-00001111”) An operation when an interrupt signal is generated with the fourth slave unit 204 will be described as an example. The fourth slave unit 204 has the same configuration as the first slave unit 201.

  When the base unit 1 detects the interrupt signal generated by the slave units 201 and 204 in the interrupt band 105 of the transmission signal (S20, S21), the base unit 1 sets the addresses of the slave units 201 and 204 that generate both interrupt signals. An address search for specifying is started. When the address search is started, the base unit 1 transmits search data including the upper 4 bits (here, “8”) of the address in the first frame F1 (S22). As a response (return data) to the search data, the first slave unit 201 returns the lower 8 bits “0E” of the address (S23), and the fourth slave unit 204 returns the lower 8 bits “0F” of the address. (S24). At this time, since the signal from the child device 201 and the signal from the child device 204 collide with each other, the parent device 1 cannot normally obtain the return data from any of the child devices 201 and 204. Therefore, when the base unit 1 detects that the collision of the signals from both the slave units 201 and 204 has occurred by the pulse width abnormality or the parity check method, the second search data is transmitted to the slave unit 2 in the second frame F2. Is transmitted (S25).

  Base unit 1 transmits search data including the upper 8 bits of the address (here, “8-0”) as the second search data. As a response (return data) to the second search data, the first handset 201 returns the lower 4 bits “E” of its own address (S26), and the fourth handset 204 is the lower 4 of its own address. The bit “F” is returned (S27). At this time, since the signal from the child device 201 and the signal from the child device 204 collide with each other, the parent device 1 cannot normally obtain the return data from any of the child devices 201 and 204. Therefore, when the base unit 1 detects that the collision of the signals from the two slave units 201 and 204 has occurred by the pulse width abnormality or the parity check method, the third search data is transmitted to the slave unit 2 in the third frame F3. Is transmitted (S28).

  Master unit 1 transmits search data including the entire address (here, “8-00”) as the third search data. If there is no response from slave unit 2, the lower 4 bits of the address are sequentially changed. Then, the fourth and subsequent search data are transmitted (S29). Here, if the base unit 1 changes the lower 4 bits of the address in the order of 0, 1, 2,..., The address “8” of the first handset 201 is included in the 17th search data. -0E "is included (S30). The first handset 201 returns the lower 8 bits “0E” of its own address as a response (return data) to the 17th search data (S31).

  Thereby, the parent device 1 can specify the address “8-0E” of the first one child device 201. Thereafter, base unit 1 continues the address search and specifies the addresses of the remaining handset 204. As described above, when an interrupt signal is generated simultaneously in the slave unit 201 having the address “8-0E” and the slave unit 204 having the address “8-0F”, the master unit 1 determines that the first slave unit is the first slave unit. It takes 17 cycles of the transmission signal to acquire the address from the machine 201.

  Here, for the third to sixteenth search data, neither the first slave unit 201 nor the fourth slave unit 204 returns a response (return data). Therefore, the third to sixteenth search data, that is, transmission data transmitted to the transmission band 103 of the third frame F3 to the sixteenth frame F16 corresponds to return unnecessary data. However, in the communication system 100 according to the present embodiment, the control unit 23 of the slave unit 2 prohibits transmission of a superimposed signal to the master unit 1 in the first reply band 104 after the transmission band 103 that has received the search data. Thus, the second communication unit 22 is controlled. Therefore, in the third frame F3 to the sixteenth frame F16, the slave unit 2 does not transmit the superimposed signal even though the return data is not transmitted in the reply band 104.

  According to the communication system 100 of the present embodiment described above, when an interrupt signal is simultaneously generated in a plurality of slave units 2, a reply band 104 that does not transmit return data for transmission data from the master unit 1. Even so, the handset 2 does not transmit the superimposed signal. Therefore, the plurality of slave units 2 that simultaneously generate the interrupt signals can avoid transmitting the superimposed signals at the same time, and can avoid collision between the superimposed signals.

  Other configurations and functions are the same as those of the first embodiment.

DESCRIPTION OF SYMBOLS 1 Base unit 10 Communication line 100 Communication system 103 Transmission band 104 Reply band 105 Interrupt band 2,201-204 Slave unit (communication terminal)
21 1st communication part 22 2nd communication part 23 Control part 24 Switch 25 Display part 26 Relay (load)

Claims (7)

A communication system in which a master unit that repeatedly transmits a transmission signal to a communication line, and a slave unit that communicates with the master unit, the master unit and the slave unit are electrically connected to the communication line,
The transmission signal is divided into a plurality of sections in the time axis direction for each frame, and the plurality of sections include a transmission band for transmitting transmission data from the master unit to the slave unit, and the slave unit Including a reply band that is a time slot for receiving return data from the master unit,
The slave unit includes a first communication unit that communicates with the master unit using the transmission signal, and a second communication unit that communicates with the master unit using a superimposed signal superimposed on the transmission signal. A control unit that controls the first communication unit and the second communication unit,
When the first communication unit receives return unnecessary data that is specific transmission data in the transmission band, the control unit does not transmit the return data in the first reply band after the transmission band. So that the superimposition signal is transmitted to the base unit in the first reply band after the transmission band in which the first communication unit has received the return unnecessary data. It is the structure which controls the said 2nd communication part. The communication system characterized by the above-mentioned. The slave unit includes a switch that switches an operation state of a load according to an operation input, and a display unit that switches a display state according to the operation state of the load,
The communication system according to claim 1, wherein the return unnecessary data includes data indicating a display state of the display unit. The control unit is configured to control the second communication unit so that handset information indicating a state of the handset is transmitted to the base unit in the reply band using the superimposed signal. The communication system according to claim 2. The communication system according to any one of claims 1 to 3, wherein the return-unnecessary data includes a dummy weight including data irrelevant to the operation of the slave unit. The slave is turned on or off depending on whether a detection unit detects at least one of the number of people and the position of the person in the monitoring area, and whether or not a person exists in the monitoring area in the detection result of the detection unit. And a determination unit for determining
Sending data representing the determination result of the determination unit using the transmission signal from the first communication unit,
The communication according to any one of claims 1 to 4, wherein the second communication unit is configured to transmit data representing a detection result of the detection unit using the superimposed signal. system. The transmission signal includes an interrupt band for detecting an interrupt signal from the slave unit by the master unit in the plurality of sections,
When the base unit detects the interrupt signal in the interrupt band, it transmits address search data as the transmission data in the first transmission band after the interrupt band, and the first after the transmission band. It is configured to receive the return data from the slave that is the transmission source of the interrupt signal in the reply band,
The control unit controls the second communication unit to prohibit transmission of the superimposed signal to the base unit in the first reply band after the transmission band that has received the address search data. It is a structure. The communication system of any one of Claims 1-5 characterized by the above-mentioned. A master unit that repeatedly transmits a transmission signal to a communication line; and a slave unit that communicates with the master unit, wherein the master unit and the slave unit are electrically connected to the communication line, and the transmission signal is 1 Each frame is divided into a plurality of sections in the time axis direction, and in the plurality of sections, a transmission band for transmitting transmission data from the master unit to the slave unit and return data from the slave unit are A communication terminal used as the slave unit in a communication system including a reply band that is a time slot received by the master unit,
A first communication unit that communicates with the base unit using the transmission signal; a second communication unit that communicates with the base unit using a superimposed signal superimposed on the transmission signal; A control unit that controls the communication unit and the second communication unit,
When the first communication unit receives return unnecessary data that is specific transmission data in the transmission band, the control unit does not transmit the return data in the first reply band after the transmission band. So that the superimposition signal is transmitted to the base unit in the first reply band after the transmission band in which the first communication unit has received the return unnecessary data. A communication terminal configured to control the second communication unit.

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