JP2016192663A - Communication device and communication system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication device that can suppress occurrence of a communication error and a communication system using the same.SOLUTION: A communication device 10 includes a transmitter (first transmitter) 11 for alternately switching the voltage value of a standby voltage Vt between a first voltage value and a second voltage value to transmit a communication signal (first communication signal) S1, and a controller (first controller) 12 for controlling the transmitter 11. The standby voltage Vt is a voltage applied between a pair of electric wires 51A, 51B. The second voltage value is smaller than the first voltage value. The communication signal S1 has communication data of plural bits. The controller 12 controls the transmitter 11 so that the time for which the voltage value of the standby voltage Vt is equal to or lower than a threshold value is at least a predetermined time with respect to a bit having the smallest bit width among the plural bits in the communication signal S1.SELECTED DRAWING: Figure 1

Description

  The present invention generally relates to a communication device and a communication system using the same, and more particularly to a communication device that communicates with another communication device using a pair of electric wires as a medium and a communication system using the communication device.

  Conventionally, an automatic fire alarm system configured by connecting a fire sensor to a sensor line derived from a fire receiver has been proposed (Patent Document 1).

  The fire receiver of the automatic fire alarm system described in Patent Document 1 is configured to output a control signal to a fire detector via a sensor line. The fire detector of the automatic fire alarm system is configured to execute an abnormality detection mode when receiving a control signal from the fire receiver.

JP 2002-8154 A

  In the automatic fire alarm system described in Patent Document 1, for example, when the wiring of the sensor line becomes long, the control signal waveform (the line capacity of the sensor line) is caused by the resistance component and the capacitance component of the sensor line (line capacitance of the sensor line). (Rising waveform and falling waveform). Therefore, in the fire receiver of the automatic fire notification system described in Patent Document 1, it is impossible to accurately output the control signal to the fire detector via the sensor line, and a communication error may occur.

  The objective of this invention is providing the communication apparatus which can suppress that a communication error generate | occur | produces, and a communication system using the same.

  The communication device according to the present invention is configured to switch a plurality of standby voltage values, which are voltages applied between a pair of electric wires, to a first voltage value and a second voltage value smaller than the first voltage value. A transmission unit that transmits a communication signal having bit communication data; and a control unit that controls the transmission unit. The control unit controls the transmission unit so that a time during which the voltage value of the standby voltage is equal to or less than a threshold is greater than or equal to a predetermined time with respect to a bit having a minimum bit width among the plurality of bits in the communication signal. Control.

  The communication system of the present invention includes a parent device having the function of the communication device and a child device that receives the communication signal from the parent device.

  In the communication apparatus of the present invention, it is possible to suppress the occurrence of a communication error.

  In the communication system of the present invention, it is possible to provide a communication system using a communication device capable of suppressing the occurrence of a communication error.

FIG. 1 is a schematic configuration diagram illustrating a part of a communication system including the communication apparatus according to the first embodiment. FIG. 2 is a block diagram illustrating a communication system including the communication apparatus according to the first embodiment. 3A to 3C relate to a communication system including the communication apparatus according to the first embodiment. FIG. 3A is a waveform diagram illustrating a waveform of a communication signal transmitted from the parent device, and FIG. 3B is a communication received by the child device. FIG. 3C is an enlarged view of a portion surrounded by a broken line in FIG. 3B. FIG. 4 is a waveform diagram showing a waveform of a communication signal transmitted from the parent device in a communication system including the communication apparatus according to the second embodiment.

(Embodiment 1)
Below, the communication apparatus 10 of Embodiment 1 is demonstrated, referring FIG. 1 and FIG.

  As illustrated in FIG. 1, the communication device 10 includes a first transmission unit 11 and a first control unit 12.

  The first transmitter 11 alternately switches the voltage value of the voltage Vt applied between the pair of electric wires 51A and 51B between a first voltage value V1 (see FIG. 3A) and a second voltage value V2 (see FIG. 3A). Thus, the communication signal S1 having a plurality of bits of communication data is transmitted. The second voltage value V2 is set smaller than the first voltage value V1. The first voltage value V1 is, for example, 24V, but is not limited to this value. The second voltage value V2 is, for example, 21V, but is not limited to this value. Hereinafter, for convenience of explanation, the voltage Vt applied between the pair of electric wires 51A and 51B is referred to as “standby voltage Vt”, the communication signal S1 is referred to as “first communication signal S1”, and the communication of the communication signal S1. The data may be referred to as “first communication data”.

  The first control unit 12 is configured to control the first transmission unit 11. The first control unit 12 determines that the voltage value of the standby voltage Vt is equal to or less than the threshold value Vs1 for the bit having the smallest bit width among the plurality of bits in the first communication signal S1 (1 bit in the example of FIG. 3A). The first transmission unit 11 is controlled such that the time T1 is equal to or longer than the predetermined time. The threshold value Vs1 is set to be smaller than the first voltage value V1 and larger than the second voltage value V2, for example. The threshold value Vs1 is set to a value of 22V, for example. Hereinafter, for convenience of explanation, the threshold value Vs1 is referred to as a “first threshold value Vs1”. The bit having the minimum bit width is not limited to 1 bit, and may be 2 bits or more.

  Below, the communication system 100 provided with the communication apparatus 10 is demonstrated based on FIG. 1 and FIG.

  The communication system 100 is, for example, an automatic fire notification system. The communication system 100 is applied to, for example, an apartment house (apartment).

  The communication system 100 includes, for example, one parent device 1 and a plurality of (16 in FIG. 2) child devices 2.

  The base unit 1 includes a first transmission unit 11 and a first control unit 12. That is, the base unit 1 has the function of the communication device 10. Details of each of the master unit 1 and the plurality of slave units 2 will be described later.

  In the present embodiment, for example, as shown in FIG. 2, one master unit 1 and 16 slave units 2 (slave units 101 to 116) are installed in one apartment house 90. Yes. Moreover, in this embodiment, the main | base station 1 and 16 units | sets of the subunit | mobile_unit 2 are electrically used, for example using a pair of electric wire 51A, 51B installed for every floor of the 1st floor-the 4th floor of the housing complex 90. It is connected. In short, in the housing complex 90, two sets of two sets (two-wire type) of electric wires 51A and 51B are provided.

  Moreover, in this embodiment, the termination | terminus resistor 3 is electrically connected to the termination | terminus of a pair of electric wire 51A, 51B installed for every floor. Note that the termination resistor 3 is not an essential component and may be omitted. In the following, for convenience of explanation, each of the 16 slave units 101 to 116 is simply referred to as “slave unit 2” unless particularly distinguished.

  The basic configuration of the communication system 100 is the same as a general automatic fire notification system.

  The communication system 100 is configured such that, for example, a fire occurrence is detected by the slave unit 2 and a fire occurrence notification (fire report) is made from the slave unit 2 to the master unit 1. In addition, the subunit | mobile_unit 2 is not restricted to the structure which detects generation | occurrence | production of a fire, For example, the structure containing a transmitter etc. may be sufficient. The transmitter means, for example, a device that has a push button switch and notifies the parent device 1 of the occurrence of a fire by manually operating the push button switch when a person detects a fire.

  By the way, as an automatic fire alarm system, there are generally a P-type (Proprietary-type) automatic fire alarm system and an R-type (Record-type) automatic fire alarm system. The P-type automatic fire notification system is configured such that the slave unit notifies the master unit of the occurrence of a fire by short-circuiting the pair of electric wires. The R-type automatic fire alarm system is configured such that a slave unit notifies the master unit of a fire by communication.

  The communication system 100 is based on a P-type automatic fire alarm system. In the present embodiment, in the housing complex 90 where the P-type automatic fire alarm system has been introduced, the existing wiring (the pair of electric wires 51A and 51B installed for each floor) is used as it is, and the master unit 1 and a plurality of units are used. Assume that the slave unit 2 is replaced. Note that the communication system 100 can also be employed as a newly introduced automatic fire alarm system.

  Below, the detail of each of the main | base station 1 and several subunit | mobile_unit 2 is demonstrated based on FIG. 1 and FIG. 3A-FIG. 3C. In the following description, only one slave unit 2 among the plurality of slave units 2 will be described, and the remaining slave units 2 have the same configuration as that of the single slave unit 2, and thus description thereof will be omitted. .

  The master unit 1 is configured to receive a fire occurrence notification (fire report) from the slave unit 2. The base unit 1 is configured to transmit the first communication signal S1 to the handset 2. For example, the parent device 1 is configured to operate the parent device 1 using a commercial power source as a main power source. The base unit 1 is installed, for example, in a management room of the apartment house 90. In addition, although the main | base station 1 uses the commercial power source as a main power supply, you may use not only this but a private power generation equipment etc., for example.

  The base unit 1 includes a first transmission unit 11 and a first control unit 12. Further, the base unit 1 includes, for example, an application unit 13, a resistor 14, a first reception unit 15, an operation unit 16, a display unit 17, a standby power supply 18, and a pair of connection terminals 19A and 19B. It has more. In base unit 1, a pair of electric wires 51A and 51B are electrically connected to a pair of connection terminals 19A and 19B.

  The first transmission unit 11 is configured to transmit the first communication signal S1 to the slave unit 2 by alternately switching the voltage value of the standby voltage Vt between the first voltage value V1 and the second voltage value V2. Yes. More specifically, the first transmission unit 11 is a voltage signal in which the standby voltage Vt changes with time by drawing current from a pair of output terminals 13A and 13B in the application unit 13 described later (see FIG. 3A). Is transmitted to the handset 2 as the first communication signal S1. The first transmitter 11 is electrically connected to the pair of connection terminals 19A and 19B.

  The first control unit 12 is configured to control the first transmission unit 11. Moreover, the 1st control part 12 is comprised so that the application part 13 and the display part 17 may be controlled separately. The first control unit 12 is electrically connected to the first transmission unit 11, the application unit 13, and the display unit 17.

  The first control unit 12 is, for example, a microcomputer (hereinafter referred to as “first microcomputer”). The first microcomputer includes a memory (hereinafter, “first memory”). A program (hereinafter referred to as “first program”) is stored in advance in the first memory. In the first program, for example, an operation mode for operating the parent device 1 is described. The first control unit 12 is not limited to the first microcomputer, and may be, for example, a microprocessor, a microcontroller, or the like. The first program is stored in advance in the first memory. However, the present invention is not limited to this. For example, the first program may be stored in the first memory using a storage medium (for example, a memory card) or an electric communication line. Good.

  The application unit 13 is configured to apply the standby voltage Vt between the pair of connection terminals 19A and 19B. The standby voltage Vt is a DC voltage.

  The application unit 13 includes a pair of output ends 13A and 13B. In the application unit 13, an output end (hereinafter referred to as “first output end”) 13A is an output end on the high potential side, and an output end (hereinafter referred to as “second output end”) 13B is an output end on the low potential side. .

  The first output terminal 13A is electrically connected to the connection terminal 19A via the resistor 14. Further, the first output end 13A is electrically connected to the first transmission unit 11 via the resistor 14. Further, the first output terminal 13A is electrically connected to the first receiving unit 15 via the resistor 14.

  The second output end 13B is electrically connected to the connection terminal 19B. The second output end 13B is electrically connected to the first transmission unit 11. Further, the second output end 13 </ b> B is electrically connected to the first receiving unit 15.

  The resistor 14 flows through the pair of wires 51A and 51B when the current flowing through the resistor 14 is converted into a voltage corresponding to the current (first function) and the pair of wires 51A and 51B is short-circuited. And a function of limiting current (second function). In short, the resistor 14 has a first function as a current-voltage conversion element and a second function as a current limiting element. The resistance value of the resistor 14 is, for example, 400Ω, but is not limited to this value, and may be 600Ω or the like. The resistor 14 is provided between the first output terminal 13A and the connection terminal 19A, but may be provided between the second output terminal 13B and the connection terminal 19B. The resistor 14 may be provided between the applying unit 13 and at least one of the pair of connection terminals 19A and 19B (connection terminal 19A in FIG. 1).

  The first reception unit 15 is configured to receive a fire occurrence notification (fire report) from the slave unit 2. The first receiving unit 15 is electrically connected to the first control unit 12. The first control unit 12 is configured to receive the fire report received by the first receiving unit 15. Details of the first receiving unit 15 will be described later.

  The operation unit 16 is configured to accept an operation input from a person, for example. The operation unit 16 is electrically connected to the first control unit 12. The first control unit 12 is configured to receive an instruction input by the operation unit 16.

  The display unit 17 is configured to display information such as a fire occurrence, for example. The display unit 17 is, for example, a liquid crystal display. For example, when a fire report is input from the first receiver 15, the first controller 12 controls the display unit 17 so that the display unit 17 displays information such as the occurrence of a fire. The display unit 17 may be configured to display not only information on the occurrence of a fire but also information on the location of the fire, for example. The display unit 17 may be configured to display information such as an instruction input by the operation unit 16. In this case, the first control unit 12 controls the display unit 17 so that the display unit 17 displays information such as the instruction when the instruction is input from the operation unit 16.

  The standby power source 18 is, for example, a storage battery.

  The base unit 1 is configured to operate the base unit 1 using the standby power source 18 as an emergency power source. Thereby, in the main | base station 1, it becomes possible to operate the main | base station 1 at the time of a power failure of a commercial power source, for example.

  The subunit | mobile_unit 2 is comprised so that notification of a fire outbreak may be performed with respect to the main | base station 1. Moreover, the subunit | mobile_unit 2 is comprised so that the 1st communication signal S1 from the main | base station 1 may be received. The subunit | mobile_unit 2 is installed in the dwelling unit etc. of the apartment house 90, for example.

  The subunit | mobile_unit 2 is the diode bridge 21, the power supply part 22, the sensor 23, the 2nd transmission part 24, the 2nd reception part 25, the 2nd control part 26, and a pair of connection terminal 27A, 27B, for example. It has. In the subunit | mobile_unit 2, a pair of electric wire 51A, 51B is electrically connected to a pair of connecting terminal 27A, 27B.

  The diode bridge 21 includes a pair of connection ends (hereinafter referred to as “first connection ends”) 21A and 21B and a pair of connection ends (hereinafter referred to as “second connection ends”) 21C and 21D.

  Of the pair of first connection ends 21A and 21B, the first connection end 21A on the high potential side is electrically connected to the connection terminal 27A. Of the pair of first connection ends 21A and 21B, the first connection end 21B on the low potential side is electrically connected to the connection terminal 27B.

  Of the pair of second connection ends 21 </ b> C and 21 </ b> D, the second connection end 21 </ b> C on the high potential side is electrically connected to the power supply unit 22. The second connection end 21 </ b> C on the high potential side is electrically connected to the second transmitter 24. Furthermore, the second connection end 21 </ b> C on the high potential side is electrically connected to the second receiving unit 25. Of the pair of second connection ends 21 </ b> C and 21 </ b> D, the second connection end 21 </ b> D on the low potential side is electrically connected to the ground of the slave unit 2.

  The power supply unit 22 is configured to generate a voltage (operating voltage) for operating the slave unit 2 from a voltage (hereinafter, “end-to-end voltage”) Vr between the pair of second connection ends 21C and 21D in the diode bridge 21. ing. The power supply unit 22 is electrically connected to the ground of the child device 2.

  For example, the sensor 23 is configured to detect the occurrence of a fire. The sensor 23 is electrically connected to the second control unit 26. The second control unit 26 is configured such that when the occurrence of a fire is detected by the sensor 23, the detection result of the sensor 23 is input. The sensor 23 is configured to detect the occurrence of a fire, but is not limited to this configuration, and may be configured to detect the generation of smoke, for example. The sensor 23 may be configured to detect fire and smoke, for example.

  The second transmission unit 24 is configured to notify the parent device 1 of the occurrence of a fire. Details of the second transmission unit 24 will be described later.

  The second receiving unit 25 is configured to receive the first communication signal S1 from the parent device 1. The second receiving unit 25 is electrically connected to the second control unit 26. The second control unit 26 is configured to receive the first communication signal S1 received by the second receiving unit 25. Details of the second receiving unit 25 will be described later.

  The second control unit 26 is configured to control the second transmission unit 24. The second control unit 26 is electrically connected to the second transmission unit 24.

  The second control unit 26 is, for example, a microcomputer (hereinafter, “second microcomputer”). The second microcomputer includes a memory (hereinafter “second memory”). A program (hereinafter, “second program”) is stored in advance in the second memory. In the second program, for example, an operation mode for operating the slave unit 2 is described.

  The second control unit 26 controls the second transmission unit 24 so that when the detection result of the sensor 23 is input, the second transmission unit 24 notifies the base unit 1 of the occurrence of a fire (fire report). To do.

  Further, when the first communication signal S1 is input from the second receiver 25, the second control unit 26 is configured to operate according to the first communication data of the first communication signal S1. Thereby, in the communication system 100, for example, by performing communication from the parent device 1 to the child device 2 using the first communication signal S1 during normal time (non-reporting time), the parent device 1 and the child device 2 It is possible to carry out automatic tests such as the communication status between the mobile stations and the operation of the slave unit 2. Further, in the communication system 100, not only the above-described automatic test is performed by performing communication from the parent device 1 to the child device 2 using the first communication signal S1 at the time of non-reporting. Various information can be transmitted to the child device 2. In other words, in the communication system 100, it is possible to add various functions by performing communication from the parent device 1 to the child device 2 using the first communication signal S1 at the time of non-reporting.

  The second control unit 26 is not limited to the second microcomputer, and may be a microprocessor, a microcontroller, or the like, for example. The second program is stored in advance in the second memory. However, the present invention is not limited to this. For example, the second program may be stored in the second memory using a storage medium (for example, a memory card) or an electric communication line. Good.

  The second transmission unit 24 includes a fire report circuit 41. The fire report circuit 41 is configured to generate a fire report.

  The fire alarm circuit 41 is electrically connected to the second control unit 26. The second control unit 26 controls the fire alarm circuit 41 so that the fire alarm circuit 41 generates a fire alarm when the detection result of the sensor 23 is input.

  The fire alarm circuit 41 steps down the voltage value of the voltage (standby voltage) Vt applied between the pair of electric wires 51A and 51B from, for example, the first voltage value V1 to the third voltage value V3 (see FIG. 3A). It is configured. The third voltage value V3 is set smaller than the second voltage value V2.

  More specifically, the fire alarm circuit 41 is configured to step down the voltage Vr at both ends corresponding to the standby voltage Vt by drawing current from the pair of second connection terminals 21C and 21D in the diode bridge 21. . The fire alarm circuit 41 is electrically connected to the second connection end 21 </ b> C on the high potential side in the diode bridge 21. The fire alarm circuit 41 is electrically connected to the ground of the slave unit 2.

  The fire alarm circuit 41 can change the voltage value of the standby voltage Vt from the first voltage value V1 to the third voltage value V3, for example, by reducing the voltage Vr at both ends. Thereby, in the 2nd transmission part 24, it becomes possible to notify to the main | base station 1 of fire occurrence. In other words, the child device 2 can notify the parent device 1 of the occurrence of a fire.

  The 1st receiving part 15 is comprised so that the notification of fire occurrence may be received from the subunit | mobile_unit 2 by detecting the voltage value of the voltage (standby voltage Vt) applied between a pair of connection terminals 19A and 19B. . More specifically, for example, when the voltage value of the standby voltage Vt changes from the first voltage value V1 to the third voltage value V3, the first receiving unit 15 notifies the fire occurrence from the slave unit 2 (fire report). Is configured to receive. Thereby, in the 1st control part 12, when a fire report is inputted from the 1st receiving part 15, it becomes possible to display information, such as a fire outbreak, on display part 17.

  The second receiving unit 25 is configured to receive the first communication signal S1 from the parent device 1 by detecting the voltage value of the both-end voltage Vr corresponding to the standby voltage Vt. More specifically, the second receiving unit 25 receives a voltage signal (see FIG. 3B) in which the both-end voltage Vr corresponding to the standby voltage Vt changed by the first transmitting unit 11 has changed over time. The communication signal S1 is received. In the following, for convenience of explanation, a voltage signal in which the voltage Vr at both ends changes with time is referred to as a “reception signal”.

  By the way, the first control unit 12 sets the standby voltage Vt to be equal to or lower than the first threshold value Vs1 (see FIG. 3A) for the bit having the minimum bit width among the plurality of bits in the first communication signal S1. The first transmitter 11 is controlled so that the time T1 is equal to or longer than the predetermined time. In the example of FIG. 3A, the bit having the smallest bit width is 1 bit.

  For a predetermined time, the voltage value of the both-ends voltage Vr is the threshold value Vs2 for all 1 bits (see FIG. 3C) of the plurality of bits in the received signal (see FIG. 3B) in which the maximum waveform rounding exists in the communication system 100. The following time T2 is set to be equal to or longer than the specified time. The specified time is the shortest time during which the second communication unit 25 can accurately receive the first communication data of the first communication signal S1. In the present embodiment, the specified time is set to 300 ms, for example. The threshold value Vs2 is set to a value of 21V, for example. Hereinafter, for convenience of explanation, the threshold value Vs2 is referred to as a “second threshold value Vs2”.

  Specifically, the predetermined time is, for example, for all 1 bits of the plurality of bits in the received signal received by the slave unit 2 (the slave units 104 and 116 in FIG. 2) farthest from the master unit 1 The time T2 is set to be equal to or longer than the specified time. In the present embodiment, the predetermined time is set to 300 ms, for example.

  In the communication system 100, even if the waveform (the rising waveform and the falling waveform) of the first communication signal S1 is lost due to the resistance component and the capacitance component of the pair of electric wires 51A and 51B, the second receiving unit 25 performs the first reception. It becomes possible to accurately receive the first communication data of the communication signal S1. Therefore, in the main | base station 1, it becomes possible to transmit 1st communication signal S1 correctly to the subunit | mobile_unit 2 via a pair of electric wire 51A, 51B, and it becomes possible to suppress that a communication error generate | occur | produces. . That is, the communication device 10 can suppress the occurrence of a communication error.

  For example, when the slave unit 2 notifies the master unit 1 of the occurrence of a fire (fire report), the slave unit 2 has a communication signal (hereinafter referred to as “second communication data”) having multi-bit communication data (hereinafter “second communication data”). 2 communication signal ") S2 may be transmitted to the base unit 1.

  The second transmission unit 24 further includes a transmission circuit 42. The transmission circuit 42 is electrically connected to the second connection end 21 </ b> C on the high potential side in the diode bridge 21. Further, the transmission circuit 42 is electrically connected to the ground of the slave unit 2.

  The transmission circuit 42 has the same function as the first transmission unit 11. The transmission circuit 42 alternately switches the voltage value of the voltage (standby voltage) Vt applied between the pair of electric wires 51A and 51B between the third voltage value V3 and the fourth voltage value, so that the child device 2 changes to the parent device. The second communication signal S2 is transmitted to 1. The fourth voltage value is set smaller than the third voltage value V3.

  More specifically, the transmission circuit 42 draws current from the pair of second connection terminals 21C and 21D in the diode bridge 21 so as to change the both-ends voltage Vr corresponding to the standby voltage Vt with time. It is configured. Thereby, in the transmission circuit 42, the voltage value of the standby voltage Vt can be switched alternately between the third voltage value V3 and the fourth voltage value, for example. Therefore, in the transmission circuit 42, the transmission circuit 42 can transmit the second communication signal S2 from the slave unit 2 to the master unit 1.

  The second control unit 26 is configured to control the transmission circuit 42. The second control unit 26 is electrically connected to the transmission circuit 42.

  The second control unit 26 controls the transmission circuit 42 so that the slave unit 2 transmits the second communication signal S2 to the master unit 1 when the detection result of the sensor 23 is input.

  The subunit | mobile_unit 2 is further provided with the memory | storage part 28, for example. The storage unit 28 is electrically connected to the second control unit 26. In the storage unit 28, for example, an identifier (address) assigned in advance to the child device 2 is stored.

  In the present embodiment, a unique identifier is assigned in advance to each of the plurality of slave units 2. The plurality of identifiers are associated one-to-one with the installation locations (for example, dwelling unit numbers) of the plurality of slave units 2. In the present embodiment, identifiers assigned in advance to each of the plurality of slave units 2 are stored in the first memory of the first control unit 12.

  When the detection result of the sensor 23 is input, the second control unit 26 reads the identifier stored in the storage unit 28, and the handset 2 has the second communication signal S2 having the second communication data corresponding to the identifier. Is transmitted to the base unit 1. The transmission circuit 42 is controlled. In short, the second communication signal S2 is a signal including information such as a fire occurrence location.

  The first receiving unit 15 is configured to receive the second communication signal S2 from the slave unit 2. The first controller 12 is configured to receive the second communication signal S2 received by the first receiver 15. Thereby, in the 1st control part 12, when 2nd communication signal S2 is input from the 1st receiving part 15, it becomes possible to display information, such as a fire outbreak place, on the display part 17. FIG. That is, in the communication system 100, when the fire occurs (when the alarm is issued), the master unit 1 communicates with the master unit 1 from the slave unit 2 using the second communication signal S2, so that the master unit 1 has a pair of electric wires 51A and 51B. It is possible to specify the reporting source not in units of groups but in units of two slave units.

  Although the subunit | mobile_unit 2 is comprised so that the 2nd communication signal S2 may be transmitted to the main | base station 1 when notifying the occurrence of a fire with respect to the main | base station 1 (at the time of alerting | reporting), it is not restricted to this structure. . The subunit | mobile_unit 2 may be comprised so that the 2nd communication signal S2 may be transmitted to the main | base station 1 except when notifying of the occurrence of a fire with respect to the main | base station 1 (at the time of non-reporting). In this case, the transmission circuit 42 alternately switches the voltage value of the voltage (standby voltage) Vt applied between the pair of electric wires 51A and 51B between the first voltage value V1 and the second voltage value V2, thereby 2 is configured to transmit the second communication signal S2 to the parent device 1. Thereby, in the communication system 100, various information is transmitted from the subunit | mobile_unit 2 to the main | base station 1 by communicating from the subunit | mobile_unit 2 to the main | base station 1 using the 2nd communication signal S2 at the time of non-reporting. Is possible. In other words, in the communication system 100, it is possible to add various functions by performing communication from the child device 2 to the parent device 1 using the second communication signal S2 at the time of non-reporting. That is, the communication system 100 is a P-type automatic fire alarm system, but uses the handset 2 that can adjust the voltage value of the voltage (standby voltage) Vt applied between the pair of electric wires 51A and 51B. The same function as that of the R type automatic fire alarm system is added.

  By the way, the subunit | mobile_unit 2 may be provided with the function of the communication apparatus 10 similarly to the main | base station 1. FIG. In this case, the second control unit 26 sets a time during which the voltage value of the standby voltage Vt is equal to or less than the first threshold value Vs1 for a bit having the minimum bit width among the plurality of bits in the second communication signal S2 for a predetermined time or more. As described above, the transmission circuit 42 of the second transmission unit 24 is controlled. Thereby, in the communication system 100, even if the waveform of the second communication signal S2 is lost due to the resistance component and the capacitance component of the pair of electric wires 51A and 51B, the first receiving unit 15 causes the second communication signal S2 to be It becomes possible to receive 2 communication data correctly. Therefore, in the subunit | mobile_unit 2, it becomes possible to transmit 2nd communication signal S2 correctly to the main | base station 1 via a pair of electric wire 51A, 51B, and it becomes possible to suppress that a communication error generate | occur | produces. .

  In addition, in the main | base station 1, although the operation part 16 and the display part 17 are provided in the different body, the operation part 16 and the display part 17 may be provided integrally.

  Moreover, although the subunit | mobile_unit 2 is provided with the memory | storage part 28, it does not need to be provided with the memory | storage part 28. FIG. In this case, in the slave unit 2, an identifier assigned in advance to the slave unit 2 is stored in the second memory of the second control unit 26.

  Moreover, although the communication system 100 is applied to an apartment house, it is not restricted to this, For example, you may apply to various buildings, such as a commercial facility, a hospital, a hotel, a multi-use building. Moreover, although the communication system 100 is an automatic fire alerting | reporting system, it is not restricted to this, For example, a lighting control system etc. may be sufficient.

  The communication device 10 according to the first embodiment described above transmits the communication signal S1 by switching the voltage value of the standby voltage Vt between the first voltage value V1 and the second voltage value V2 alternately (first transmission). Unit) 11 and a control unit (first control unit) 12 that controls the transmission unit 11. The standby voltage Vt is a voltage applied between the pair of electric wires 51A and 51B. The second voltage value V2 is smaller than the first voltage value V1. The communication signal S1 has a plurality of bits of communication data (first communication data). The control unit 12 transmits the transmission unit such that the time T1 at which the voltage value of the standby voltage Vt is equal to or less than the threshold value Vs1 is equal to or greater than a predetermined time for the bit having the minimum bit width among the plurality of bits in the communication signal S1 11 is controlled. Thereby, in the communication apparatus 10, it becomes possible to transmit the communication signal S1 correctly to the subunit | mobile_unit 2 via a pair of electric wire 51A, 51B, for example. Therefore, the communication device 10 can suppress the occurrence of a communication error.

  The communication system 100 according to the first embodiment described above includes the parent device 1 having the function of the communication device 10 and the child device 2 that receives the communication signal S1 from the parent device 1. Thereby, in the communication system 100, the communication system using the communication apparatus which can suppress that a communication error generate | occur | produces can be provided.

(Embodiment 2)
Below, the communication apparatus of Embodiment 2 is demonstrated based on FIG. The basic configuration of the communication apparatus according to the second embodiment is the same as that of the communication apparatus 10 according to the first embodiment. Therefore, in the communication device according to the second embodiment, the same components as those of the communication device 10 are denoted by the same reference numerals, and description and illustration thereof are omitted as appropriate. Moreover, in the communication apparatus of Embodiment 2, the 1st transmission part 11 transmits the communication signal (henceforth "3rd communication signal") S3 different from 1st communication signal S1, as shown in FIG. However, it is different from the communication device 10. Note that the communication apparatus of the second embodiment is applied to the parent device 1 in the communication system 100 of the first embodiment.

  The first control unit 12 determines that the third communication signal S3 includes a plurality of bits (first plurality of bits) of communication data (hereinafter “third communication data”) and a plurality of bits (second plurality of bits) of a synchronization code (preamble). ) To control the first transmitter 11. In addition, the first control unit 12 controls the first transmission unit 11 so that the bit rate of the synchronization code is lower than the bit rate of the third communication data.

  Thereby, in the main | base station 1 which comprises the function of the communication apparatus of Embodiment 2, the waveform rounding of a synchronous code is compared with the waveform rounding of 3rd communication data with respect to the resistance component and capacity component of a pair of electric wire 51A, 51B. Can also be suppressed. In other words, in the base unit 1 having the function of the communication device according to the second embodiment, it is possible to make the reliability of the synchronization code higher than the reliability of the third communication data. As a result, the slave unit 2 of the communication system 100 using the communication apparatus according to the second embodiment can receive the synchronization code even when the third communication data cannot be received. Therefore, in the slave unit 2 of the communication system 100 using the communication apparatus of the second embodiment, this synchronization code is sent to the master unit 1 by, for example, a plurality of slave units 2 notifying the occurrence of fire (fire report) in a time-sharing manner. Therefore, it can be used for synchronization in the case of performing it on the other hand. Moreover, in the subunit | mobile_unit 2 of the communication system 100 using the communication apparatus of Embodiment 2, when a 3rd communication data can be received, a synchronous code can be received without fail.

  As shown in FIG. 4, it is preferable that the first control unit 12 controls the first transmission unit 11 so that the bit string included in the communication data (third communication data) is not included in the synchronization code. For example, the first control unit 12 preferably controls the first transmission unit 11 such that a Manchester code is used for the third communication data. Thereby, in the subunit | mobile_unit 2 of the communication system 100 using the communication apparatus of Embodiment 2, it becomes possible to suppress misdetecting a synchronization with the 3rd communication data of 3rd communication signal S3. In other words, in the base unit 1 having the function of the communication apparatus according to the second embodiment, the reliability of the synchronization code can be further improved.

  As shown in FIG. 4, it is preferable that the first control unit 12 controls the first transmission unit 11 so that a plurality of bit rates are provided in the synchronization code. In this embodiment, the bit rate of the synchronization code is set to two bit rates of 1.2 kbps and 400 bps, for example. Thereby, in the subunit | mobile_unit 2 of the communication system 100 using the communication apparatus of Embodiment 2, when a single frequency noise (for example, noise of a 3 bit period) mixes in a pair of electric wire 51A, 51B, for example. Even if it exists, it becomes possible to suppress misdetecting a synchronous code. In other words, in the base unit 1 having the function of the communication apparatus according to the second embodiment, the reliability of the synchronization code can be further improved. In this embodiment, the bit rate of the synchronization code is set to 1.2 kbps and 400 bps, but these bit rate values are merely examples and are not particularly limited. In this embodiment, the synchronization code is set to two bit rates, but may be set to three or more bit rates.

  In the communication apparatus according to the second embodiment described above, the control unit (first control unit) 12 includes the first plurality of bits of communication data (third communication data) in which the communication signal S3 is a plurality of bits, and the first plurality of bits. The transmission unit 11 is controlled so as to have a second multi-bit synchronization code different from. Further, the control unit 12 controls the first transmission unit 11 so that the bit rate of the synchronization code is lower than the bit rate of the communication data. Thereby, in the communication device of the second embodiment, for example, the waveform rounding of the synchronization code can be suppressed more than the waveform rounding of the communication data with respect to the resistance component and the capacitance component of the pair of electric wires 51A and 51B. . In other words, in the communication device of the second embodiment, the reliability of the synchronization code can be made higher than the reliability of the communication data.

  In the communication apparatus according to the second embodiment, the control unit (first control unit) 12 includes a transmission unit (first transmission unit) so that the bit string included in the communication data (third communication data) is not included in the synchronization code. 11 is preferably controlled. Thereby, in the communication apparatus of Embodiment 2, it becomes possible to improve the reliability of a synchronous code more.

  In the communication apparatus according to the second embodiment, it is preferable that the control unit (first control unit) 12 controls the transmission unit (first transmission unit) 11 so that a plurality of bit rates are provided in the synchronization code. Thereby, in the communication apparatus of Embodiment 2, it becomes possible to further improve the reliability of the synchronization code.

DESCRIPTION OF SYMBOLS 1 Base machine 2 Slave machine 10 Communication apparatus 11 1st transmission part (transmission part)
12 1st control part (control part)
100 communication system

Claims (5)

Communication having a plurality of bits of communication data by alternately switching a voltage value of a standby voltage, which is a voltage applied between a pair of wires, between a first voltage value and a second voltage value smaller than the first voltage value A transmission unit that transmits a signal, and a control unit that controls the transmission unit,
The control unit controls the transmission unit so that a time during which the voltage value of the standby voltage is equal to or less than a threshold is greater than or equal to a predetermined time with respect to a bit having a minimum bit width among the plurality of bits in the communication signal. A communication device characterized by controlling. The control unit includes the synchronization signal so that the communication signal includes the communication data of the first plurality of bits which are the plurality of bits and a second plurality of bits of synchronization code different from the first plurality of bits. The communication apparatus according to claim 1, wherein the transmission unit is controlled such that a bit rate of a code is lower than a bit rate of the communication data. The communication apparatus according to claim 2, wherein the control unit controls the transmission unit so that a bit string included in the communication data is not included in the synchronization code. The communication device according to claim 2, wherein the control unit controls the transmission unit so that a plurality of bit rates are provided in the synchronization code. 5. A communication device comprising: a parent device having the function of the communication device according to claim 1; and a child device that receives the communication signal from the parent device. system.

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