WO2020165937A1 - Dispositif de réglage de résistance de terminal et système de réglage de résistance de terminal - Google Patents

Dispositif de réglage de résistance de terminal et système de réglage de résistance de terminal Download PDF

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Publication number
WO2020165937A1
WO2020165937A1 PCT/JP2019/004826 JP2019004826W WO2020165937A1 WO 2020165937 A1 WO2020165937 A1 WO 2020165937A1 JP 2019004826 W JP2019004826 W JP 2019004826W WO 2020165937 A1 WO2020165937 A1 WO 2020165937A1
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WIPO (PCT)
Prior art keywords
communication
communication device
unit
setting
terminating
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PCT/JP2019/004826
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English (en)
Japanese (ja)
Inventor
中條　崇
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東芝キヤリア株式会社
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Application filed by 東芝キヤリア株式会社 filed Critical 東芝キヤリア株式会社
Priority to PCT/JP2019/004826 priority Critical patent/WO2020165937A1/fr
Priority to JP2020571936A priority patent/JP7277488B2/ja
Publication of WO2020165937A1 publication Critical patent/WO2020165937A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/10—Monitoring; Testing of transmitters
    • H04B17/11—Monitoring; Testing of transmitters for calibration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details

Definitions

  • the present invention relates to a termination resistance setting device and a termination resistance setting system.
  • a communication system in which a plurality of slave units are connected to one master unit (management device) by a communication line via a bus.
  • the indoor unit serves as a child device and the outdoor unit or a central management device serves as a parent device.
  • the management device sequentially acquires and collectively manages information regarding the operation of each connected indoor unit (for example, set temperature information and sensor information). Further, in such an air conditioning system, the operation of a plurality of indoor units can be collectively controlled by the management device.
  • the terminating resistances for the master unit and the slave unit at appropriate positions for setting the terminating resistors, generally both ends of the communication line.
  • the installer or administrator of the air conditioning system is located near the end of the communication line in order to set the termination resistance. It was necessary to find out the indoor unit that is the slave unit.
  • many indoor units are often connected to a long communication line. Therefore, it is not easy to manually find the indoor unit located at the end of the communication line from among many indoor units.
  • the terminating resistor is set once, the number of slave units connected to the communication line may change due to, for example, the addition or removal of indoor units, or the communication line may be replaced with a different length or type. is there. In this case, since the appropriate position of the terminating resistor may change, it is necessary to set the terminating resistor again each time.
  • the problem to be solved by the present invention is to provide a termination resistance setting device and a termination resistance setting system that can easily set the termination resistance of a communication line at an appropriate position.
  • the termination resistance setting device of the embodiment has a communication unit and a termination resistance setting command unit.
  • the communication unit performs test communication with a plurality of communication devices connected by communication.
  • the terminating resistance setting command unit causes a terminating resistance to be set for any communication device of the plurality of communication devices, and when the test communication is not established, sets the terminating resistance for the communication device.
  • the communication terminal is released and the terminating resistor is set for any communication device different from the communication device.
  • the whole air-conditioning system 100 lineblock diagram concerning a 1st embodiment.
  • the block diagram which shows the function structure of the communication apparatus 20 which concerns on 1st Embodiment. 3 is a flowchart showing the operation of the communication device 10 according to the first embodiment.
  • the schematic diagram for demonstrating the characteristic of the acquired pulse signal The schematic diagram for demonstrating the characteristic of the acquired pulse signal.
  • the schematic diagram for demonstrating the characteristic of the acquired pulse signal The figure which shows an example of the measurement result information collected by the communication apparatus 10 which concerns on 2nd Embodiment.
  • FIG. 1 is an overall configuration diagram of an air conditioning system 100 according to the first embodiment.
  • the air conditioning system 100 shown in FIG. 1 is an air conditioning system installed in, for example, an office building.
  • an air conditioning system 100 includes an outdoor unit 1 which is an outdoor unit of an air conditioner, and an indoor unit of an air conditioner which is connected to the outdoor unit 1 by a communication line 30 and a refrigerant pipe.
  • the machine 2-1, the indoor unit 2-2, and the indoor unit 2-3 are included.
  • the indoor unit 2-1, the indoor unit 2-2, and the indoor unit 2-3 are simply referred to as "indoor unit 2" unless it is necessary to distinguish between them.
  • the outdoor unit 1 and each indoor unit 2 constitute a refrigeration cycle.
  • the air conditioning system 100 includes one outdoor unit 1 and a plurality of indoor units 2.
  • the outdoor unit 1 collectively controls the operations of the plurality of indoor units 2.
  • the number of indoor units 2 controlled by one outdoor unit 1 is set to three, but when the outdoor unit 1 having a large capacity is used, the number of indoor units is 10 or more. It is also possible to connect the indoor units 2, and actually, considerably more than three indoor units 2 are connected. Furthermore, different outdoor units 1 and a plurality of indoor units 2 connected to the outdoor unit 1 may be communicably connected.
  • the outdoor unit 1 includes a communication device 10 (terminating resistance setting device) that is a master device for communication.
  • Each of the indoor units 2-1 to 2-3 includes communication devices 20-1 to 20-3, which are slave units in communication.
  • the communication devices 20-1 to 20-3 are simply referred to as “communication device 20” unless it is necessary to distinguish between them.
  • the communication device 10 is provided in the outdoor unit 1.
  • the communication device 10 is not limited to this.
  • a centralized management device (not shown) that centrally manages the entire air conditioning system, etc. May be equipped with.
  • the outdoor unit 1 becomes the communication device 20 which is a slave unit.
  • the communication device 10 and the communication devices 20-1 to 20-3 are connected by a communication line 30 by a bus connection method. Since each indoor unit 2 is installed indoors and only the outdoor unit 1 is installed outdoors, the communication device 10 of the outdoor unit 1 is usually installed at one end position of the communication line 30. Even when the communication device 10 is used as the centralized management device, the centralized management device is often provided at the end of the building and is likely to be installed at one end position of the communication line 30.
  • the communication device 10 and the plurality of communication devices 20 have a communication function of communicating with each other.
  • the communication device 10 acquires, for example, the information indicating the operating status of the indoor unit 2 or the temperature and humidity information of the room in which the indoor unit 2 is installed by acquiring the signal output from the communication device 20.
  • the communication device 10 can control the operating state (for example, the operating state and the set temperature) of the indoor unit 2 by outputting a signal to the communication device 20.
  • the communication device 10 includes a terminating resistor 11 described later, and is always enabled. Therefore, the communication device 10 always has a function as a terminating device. Further, as will be described later, the communication device 10 also has a function of causing one communication device 20 at an appropriate position on the communication line 30 to set the other terminating resistance.
  • the communication device 20 includes a terminating resistance setting unit 21, which will be described later, including a terminating resistance.
  • the terminating resistance setting unit 21 sets or cancels the terminating resistance, that is, switches on/off based on the command output from the communication device 10. Therefore, the communication device 20 may or may not have a function as a terminating device.
  • the communication device 10 and the communication device 20 are both communication in a high-speed communication mode, which is a communication mode for performing high-speed communication, and in a low-speed communication mode, which is a communication mode for relatively low-speed communication. , And can be automatically switched to communicate (transmit and receive).
  • the termination resistors are released in the termination resistance setting units 21 of all the communication devices 20. Therefore, in the initial state, since all the communication devices 20 do not have the function as the terminating device, reflection of the signal transmitted by the communication line 30 is likely to occur at the end of the communication line 30, The signal waveform is easily disturbed. In particular, when communication is performed at high speed, each pulse signal becomes short, so that the influence of signal reflection becomes relatively large. To deal with this, in the initial state, both the communication device 10 and the communication device 20 operate in the low speed communication mode.
  • the communication device 10 performs control for suppressing reflection of a signal transmitted by the communication line 30 and enabling communication with the communication device 20 in the high-speed communication mode. Specifically, the communication device 10 operates as a terminating resistance setting device, and selects the communication device 20 at a position (mainly at the end of the communication line 30) suitable for providing a terminating resistance in the communication line 30. Then, the communication device 10 outputs, to the termination resistance setting unit 21 of the selected communication device 20, an instruction (hereinafter, referred to as “termination resistance setting instruction”) for switching the termination resistance setting unit 21 to the state in which the termination resistance is set. To do. As will be described later, the terminating resistance setting command is also used to search for the communication device 20 at a position suitable for providing the terminating resistance.
  • the termination resistance setting unit 21 of the selected communication device 20 switches to the state where the termination resistance is set according to the obtained termination resistance setting command.
  • the communication device 20 functions as a terminating device.
  • the terminal resistance is set in the specified communication device 20 so that signal reflection is suppressed and high-speed communication without disturbing the signal waveform. Will be able to do. By performing high-speed communication, it becomes possible to quickly transfer information required between the communication devices 10 and 20 during operation.
  • the communication device 10 outputs a termination resistance setting command to any one communication device 20 in a low-speed communication mode in which communication is possible without setting a termination resistance.
  • the terminating resistance is set in the communication device 20 that has acquired the terminating resistance setting command.
  • the communication device 10 first causes the communication device 20-1 to set a terminating resistor.
  • the communication device 10 instructs all communication devices 20 to switch the communication mode from the low-speed communication mode to the high-speed communication mode in the low-speed communication mode in which the setting of the terminating resistor is unnecessary (hereinafter, “communication”). It is called "speed switching command”.). As a result, in all the communication devices 20, the communication mode is switched to the high speed communication mode.
  • the communication device 10 switches the communication mode of its own communication device 10 from the low speed communication mode to the high speed communication mode. Then, the communication device 10 sequentially tries to establish communication with each communication device 20 in the high-speed communication mode.
  • the communication device 10 is a communication device in which the communication device 20-1 having the terminating resistance is located at an appropriate position for setting the terminating resistance. Judge that there is. However, as shown in FIG. 1, since the communication device 20-1 is not a communication device located at the end of the communication line 30, it is highly likely that communication will not be established.
  • the communication device 10 When the communication is not established (for example, when a communication error occurs with any of the communication devices 20), the communication device 10 is configured such that the communication device 20-1 having the terminating resistance sets the terminating resistance. It is determined that the communication device 20 is not located at an appropriate position for setting. Then, the communication device 10 causes the communication device 20-1 in which the terminating resistance is set in the low-speed communication mode to cancel the setting of the terminating resistance (hereinafter, referred to as “terminating resistance setting cancellation command”). Is output. As a result, the setting of the terminating resistor in the communication device 20-1 is released.
  • the communication device 10 outputs a termination resistance setting command to any one other communication device 20 (other than the communication device 20-1 which has already tried to set the termination resistance). For example, the communication device 10 outputs a termination resistance setting command to the communication device 20-2 to set the termination resistance. Then, similarly to the above, the communication device 10 attempts to establish communication with each communication device 20.
  • the communication device 20-2 is also not a communication device located at the end of the communication line 30, it is generally highly likely that communication will not be established.
  • the communication device 10 determines that the communication device 20-2 with the terminating resistance set is not a communication device located at an appropriate position for setting the terminating resistance. Then, the communication device 10 outputs a termination resistance setting cancellation command to the communication device 20-2 in which the termination resistance has been set in the low speed communication mode.
  • the communication device 10 issues a termination resistance setting command to any one communication device 20 (other than the communication devices 20-1 and 20-2, which has already tried to set the termination resistance). Output.
  • the communication device 10 since only the communication device 20-3 remains in the remaining communication devices 20, the communication device 10 outputs a termination resistance setting command to the communication device 20-3 to set the termination resistance.
  • the communication device 10 attempts to establish communication with each communication device 20. As shown in FIG. 1, since the communication device 20-3 is a communication device located at the end of the communication line 30, communication with all communication devices 20 is established.
  • the communication device 10 determines that the communication device 20-3 having the terminating resistance set therein is a communication device located at an appropriate position for setting the terminating resistance. That is, the communication device 10 determines the communication device 20-3, to which the terminating resistor is set when the communication is established, as the terminating resistor setting target. As described above, the communication device 10 repeatedly attempts to establish communication while sequentially setting the terminating resistance for each communication device 20, and based on the establishment of the communication, the communication device 10 is set to an appropriate position for setting the terminating resistance. Identify the communication device located. After that, the communication device 10 and each communication device 20 communicate with each other in the high-speed communication mode. The system administrator sets the addresses of the communication device 10 and the communication device 20 in advance by using the low-speed communication mode as necessary.
  • FIG. 2 is a block diagram showing a functional configuration of the communication device 10 according to the first embodiment.
  • the communication device 10 serving as a master device includes a terminating resistor 11 and a signal transmitting/receiving circuit 12.
  • the internal terminating resistor 11 is always connected to the communication line 30, which is a two-wire communication line, as shown in FIG. Therefore, the communication device 10 always functions as a terminating device.
  • the signal transmission/reception circuit 12 is a circuit that transmits/receives signals in communication with each communication device 20.
  • the signal transmission/reception circuit 12 also operates as a termination resistance setting device.
  • the signal transmission/reception circuit 12 identifies the communication device 20 located at an appropriate position (mainly the other end of the communication line 30) in setting the terminating resistance.
  • the signal transmission/reception circuit 12 outputs a command to each communication device 20 to control the setting state of the terminating resistor in each communication device 20.
  • the signal transmission/reception circuit 12 includes a control unit 120, a command unit 121, a communication unit 122, a clock unit 123, a storage unit 125, a determination unit 126, a communication speed switching unit 127, It is configured to include.
  • the control unit 120 controls processing by each functional block of the signal transmission/reception circuit 12. For example, the control unit 120 controls transmission/reception of signals in communication with each communication device 20. Further, for example, the control unit 120 controls the output of various commands from the command unit 121 to each communication device 20.
  • the control unit 120 is a processor such as a CPU (Central Processing Unit).
  • the control unit 120 may be realized by using hardware such as an LSI (Large-scale Integrated Circuit; large-scale integrated circuit) and an ASIC (Application Specific Integrated Circuit). Further, each functional block included in the signal transmission/reception circuit 12 may be realized by the control unit 120, which is a processor such as a CPU, executing a program stored in the storage unit 125.
  • the command unit 121 controls the output of various commands output to each communication device 20.
  • the command unit 121 outputs various commands to each communication device 20 via the communication unit 122.
  • the command unit 121 includes a termination resistance setting command unit 121a and a communication speed switching command unit 121b.
  • the termination resistance setting instruction unit 121a outputs a termination resistance setting instruction indicating an instruction for setting the termination resistance to any one communication device 20.
  • the termination resistance setting command unit 121a causes the communication device 20 that has output the termination resistance setting command to cancel the setting of the termination resistance.
  • a termination resistance setting cancellation command indicating a command for Then, the terminating resistance setting command unit 121a outputs the terminating resistance setting command to another arbitrary one communication device 20.
  • the termination resistance setting command unit 121a does not output the termination resistance setting cancellation command. That is, the terminating resistance setting command unit 121a determines the communication device 20 that has set the terminating resistance when the communication is established, as the terminating resistance setting target.
  • the terminating resistance setting command unit 121a sets the terminating resistance when at least one communication device 20 is added or removed when the terminating resistance is already set for the communication device 20 located at an appropriate position.
  • a cancellation command may be output. This is because the appropriate position for setting the terminating resistance may change due to the addition or removal of the communication device 20.
  • the signal transmitting/receiving circuit 12 is configured to newly identify the communication device 20 located at an appropriate position for setting the terminating resistance, and set the terminating resistance for the identified communication device 20. Specifically, when the indoor unit 2 is added or removed, the power supplies of all the outdoor units 1 and the indoor units 2 are temporarily cut off. When the power is turned on again, the communication device 10 of the outdoor unit 1 performs the terminating resistor resetting operation, so that the above processing can be performed.
  • the communication speed switching command unit 121b when the terminating resistance setting command unit 121a outputs the terminating resistance setting command, the communication speed indicating a command for switching the communication mode in communication with the communication device 10 of its own to the high speed communication mode.
  • the switching instruction is output to each communication device 20.
  • the communication unit 122 is a communication interface for making a communication connection with each communication device 20.
  • the communication unit 122 may be a functional unit including a transmission unit and a reception unit, which are configured by separate hardware.
  • the communication unit 122 Under the control of the control unit 120, the communication unit 122 outputs various signals (for example, pulse signals) to each communication device 20 via the communication line 30. It should be noted that the various signals also include the signals output from the instruction unit 121 and indicating the above-mentioned termination resistance setting instruction and communication speed switching instruction.
  • the communication unit 122 also acquires various signals (for example, pulse signals) output from the communication devices 20 via the communication line 30.
  • the communication unit 122 detects that communication with the communication device 20 has been established, a communication error has occurred, and the like. In addition, during normal operation, when the content of communication with each communication device 20 is operation data, the data is sent to the control unit 120, and the control unit 120 performs necessary processing.
  • the clock unit 123 is a timer that measures the elapsed time after the communication unit 122 attempts to establish communication with the communication device 20. When a predetermined time has passed since the communication unit 122 tried to establish communication with the communication device 20, the time counting unit 123 notifies each functional unit that the predetermined time has passed.
  • the storage unit 125 stores various programs and data tables used in the signal transmitting/receiving circuit 12.
  • the storage unit 125 is a non-volatile recording medium (non-temporary recording medium) such as a flash memory or an HDD (Hard Disk Drive).
  • the storage unit 125 may further include a volatile recording medium such as a RAM (Random Access Memory) or a register.
  • the storage unit 125 also stores the communication device information table t1.
  • the communication device information table t1 is two-dimensional tabular data composed of a column of two items of “identification number” and “address”.
  • the value stored in the item of the identification number is an identification number for identifying each communication device 20.
  • the identification numbers associated with the communication device 20-1, the communication device 20-2, and the communication device 20-3 are stored as “c1”, “c2”, and “c3” in the communication device information table t1. It
  • the communication device information table t1 is a table that associates the identification number assigned to each communication device 20 with the address of each communication device 20, which is necessary for the communication device 10 to communicate with each communication device 20. ..
  • the address of the communication device 20-1 assigned with the identification number “c1” is “aaa.bbb”.
  • the communication device 10 When the communication device 10 outputs a signal to a specific communication device 20, the communication device 10 refers to the communication device information table t1 and recognizes the address corresponding to the output communication device 20. Then, the communication device 10 outputs the signal by designating the recognized address as the output destination address. For example, the communication device 10 can output a signal to the communication device 20-1 assigned with the identification number “c1” by designating the address “aaa.bbb” and outputting the signal.
  • the determining unit 126 determines that the communication device 20 having the terminating resistance set at that time is located at an appropriate position for setting the terminating resistance. It is determined that the communication device is a communication device.
  • the determining unit 126 when the communication between the communication unit 122 and each of the communication devices 20 is not established at the time when the notification indicating that the predetermined time has elapsed is acquired from the time counting unit 123, the determining unit 126, for example, during communication.
  • the communication device 20 in which the terminating resistance is set at that time is determined not to be a communication device located at an appropriate position in setting the terminating resistance.
  • the communication speed switching unit 127 switches the communication mode to the high speed communication mode in which the communication speed in communication with each communication device 20 is high when the termination resistance setting command unit 121a outputs a termination resistance setting command. In addition, when the communication speed switching unit 127 acquires a notification indicating that the predetermined time has elapsed from the timer unit 123, the communication speed switching unit 127 switches the communication mode to the low speed communication mode in which the communication speed in communication with each communication device 20 is low. ..
  • FIG. 3 illustrates only the communication devices 20-2 and 20-3 as an example.
  • the description of each functional unit included in the communication device 20-3 is omitted.
  • the functional configuration of the communication device 20 will be described below with reference to the communication device 20-2 shown in FIG.
  • the communication device 20 is configured to include a termination resistance setting unit 21 and a signal transmission/reception circuit 22.
  • the signal transmission/reception circuit 22 is a circuit that transmits/receives signals in communication with the communication device 10. As shown in FIG. 3, the signal transmission/reception circuit 22 includes a control unit 220, a communication unit 221, a communication speed switching unit 222, a clock unit 223, and a storage unit 224.
  • the termination resistance setting unit 21 is configured to include a termination resistance.
  • the termination resistance setting unit 21 is controlled by the control unit 220 to be in a state in which the termination resistance is set (ON state). Switch.
  • the terminating resistance setting unit 21 is in a state (OFF (OFF)) in which the terminating resistor is not set by the control of the control unit 220. State).
  • the control unit 220 controls various processes performed by each functional block of the signal transmitting/receiving circuit 22 and the operation of the terminating resistance setting unit 21. For example, the control unit 220 controls the transmission and reception of signals in the communication between the communication unit 221 and each communication device 20.
  • the control unit 220 is a processor such as a CPU. Further, each functional block included in the signal transmission/reception circuit 22 may be realized by the control unit 220 executing a program stored in the storage unit 224.
  • the communication unit 221 is a communication interface for communication connection with the communication device 10 and each of the other communication devices 20.
  • the communication unit 221 may be a functional unit including a transmission unit and a reception unit, which are configured by separate hardware.
  • the communication unit 221 acquires various signals (for example, pulse signals) output from the communication device 10 or each communication device 20 (including its own communication device 20). It should be noted that the various signals include signals indicating the termination resistance setting command and the communication speed switching command, which are output from the communication device 10 described above.
  • the communication speed switching unit 222 switches the communication with the communication device 10 and each communication device 20 to the high-speed communication mode. Further, the communication speed switching unit 222 switches the communication with the communication device 10 and each communication device 20 to the low speed communication mode when the communication unit 223 receives the notification indicating that the predetermined time has elapsed from the time counting unit 223.
  • the clock unit 223 is a timer that measures the elapsed time after the communication unit 221 acquires the signal indicating the termination resistance setting command output from the communication device 10. When the predetermined time has elapsed, the timer unit 223 notifies each functional unit that the predetermined time has elapsed.
  • the storage unit 224 stores various programs used in the signal transmission/reception circuit 22.
  • the storage unit 224 is a non-volatile recording medium (non-temporary recording medium) such as a flash memory or an HDD.
  • the storage unit 224 may further include a volatile recording medium such as a RAM or a register.
  • control unit 120 substitutes 1 into the value of “i” indicating the number of the communication device 20 (step S001).
  • step S*** is represented by “S***”.
  • control unit 120 adds 1 to the value of “i”, and the processing is repeatedly executed.
  • the termination resistance setting command unit 121a outputs a termination resistance setting command to the i-th communication device 20-i (S002). Further, the communication speed switching command unit 121b outputs the communication speed switching command to all the communication devices 20 (that is, the first communication device to the nth communication device) (S003). Further, the communication speed switching unit 127 switches the communication mode of its own communication device 10 to the high speed communication mode in which the communication speed in communication with each communication device 20 is high. The terminating resistance setting command and the communication speed switching command in S002 and S3 are communicated in the low speed communication mode in order to surely transfer them to each communication device 20.
  • the communication unit 122 performs communication (test communication) with each communication device 20 (S005).
  • the determination unit 126 determines that the i-th communication device is a communication device located at an appropriate position for setting the terminating resistance, and the determination unit 126 The i communication device is determined as the device for which the terminating resistor is set (S007). In this case, the process shown by the flowchart in FIG. 4 ends.
  • the determination unit 126 waits for establishment of communication between the communication unit 122 and each communication device 20.
  • the determination unit 126 determines that the i-th communication device is not a communication device located at an appropriate position for setting the terminating resistance. Then, the communication speed switching unit 127 switches the communication mode of its own communication device 10 to the low speed communication mode in which the communication speed in communication with each communication device 20 is low (S009).
  • the communication device 20 acquires the termination resistance setting command via the communication unit 221 (YES in S101). Then, the terminating resistance setting unit 21 switches to the state in which the terminating resistance is set (ON state) (S102).
  • the communication device 20 determines whether or not the communication speed switching command is output from the communication device 10 (S105).
  • the communication speed switching unit 222 sets the communication speed switching command output from the communication device 10 to the communication unit.
  • the communication speed switching unit 222 switches the communication mode to the high speed communication mode in which the communication speed in the communication with the communication device 10 and each communication device 20 is high. (S106).
  • the communication speed switching unit 222 After that, the communication speed switching unit 222 has not passed the predetermined time since the communication mode was switched to the high-speed communication mode (that is, in the case where the timer 223 has not output the notification indicating the passage of the predetermined time). (No in S107), the communication speed is not switched. Then, when a predetermined time has passed since the communication mode was switched to the high-speed communication mode (that is, when a notification indicating that the predetermined time has passed is output from the time counting unit 223) (S107 Yes), the communication speed switching unit 222 determines The communication mode is switched to the low speed communication mode in which the communication speed in the communication with the communication device 10 and each communication device 20 is low. (S108). Although illustration is omitted, the communication device 10 and each of the communication devices 20 communicate with each other from S106 to YES in S107, and the communication device 10 determines whether the communication is finally established. To be done.
  • the termination resistance setting unit 21 acquires the termination resistance setting cancellation command output from the communication device 10 via the communication unit 221 (S103 YES), the termination resistance is not set (OFF state). (S104). Subsequently, it is determined whether or not the communication speed switching command is acquired in S105. Since the communication speed switching command does not come after the termination resistance setting cancel command, the result in S105 is NO, the process ends, and the process returns to the beginning. By repeating the above process between the communication device 10 and the communication device 20, finally, the communication device 10 and the communication device 20 can smoothly communicate with each other in the high-speed communication mode.
  • the communication device 10 includes the communication unit 122 that performs communication (test communication) with the plurality of communication devices 20 that are communicatively connected, and the plurality of communication devices. If a terminating resistor is set for any communication device 20 of the 20 and communication (test communication) is not established, the setting of the terminating resistor is canceled for the communication device 20 and an arbitrary value different from the communication device is set. And a terminating resistance setting command unit 121a for setting a terminating resistance to the communication device. As a result, the communication device 10 (termination resistance setting device) according to the first embodiment can easily set the termination resistance in the communication line 30 to an appropriate position.
  • the communication device 10 and each communication device 20 transmit and receive pulse signals that are test signals to each other, and based on the pulse widths of the pulse signals respectively acquired in the communication device 10 and each communication device 20, The communication device 20 located at an appropriate position for setting the terminating resistance is specified.
  • FIGS. 6 and 7 are schematic diagrams for explaining the characteristics of the acquired pulse signal.
  • the pulse signal will be described with the LO (ground) side given priority.
  • the moving distance until the pulse signal B is transmitted from the communication device 20-1 to the communication device 10 is longer than the moving distance until the pulse signal A is transmitted from the communication device 20-1 to the communication device 10.
  • the pulse signal B reaches the communication device 10 slightly later than the pulse signal A.
  • the communication device 10 recognizes two pulse signals (pulse signal A and pulse signal B) that are superimposed in a state where there is a time lag as one pulse signal. That is, as shown in FIG. 6, the communication device 10 recognizes that a pulse signal having one pulse width x (x>w) in which the pulse signal A and the pulse signal B are superimposed is acquired.
  • FIG. 7A shows a pulse signal recognized by the communication device 10 when a pulse signal having a pulse width w is output from the communication device 20-2.
  • the pulse signal B is transmitted from the communication device 20-1 to the communication device 10 as compared with the case where the pulse signal is output from the communication device 20-1.
  • the time difference between the two superimposed pulse signals (pulse signal A and pulse signal B) is smaller than that in the case of the pulse signal shown in FIG. Therefore, as illustrated in FIG. 7A, the communication device 10 recognizes that a pulse signal having one pulse width y (x>y>w) in which the pulse signal A and the pulse signal B are superimposed is acquired.
  • FIG. 7B shows a pulse signal recognized by the communication device 10 when a pulse signal having a pulse width w is output from the communication device 20-3.
  • the communication device 10 recognizes that the pulse signal having the pulse width z (x>y>w ⁇ z) has been acquired.
  • the reason why the pulse width shown in FIG. 7B is not the same as the pulse width w of the pulse signal at the time of being output from the communication device 20-3 is, for example, a cause other than reflection (for example, signal attenuation). This is because the pulse width may change slightly.
  • the pulse width of the pulse signal output from the communication device 20 closer to the communication device 10 is recognized by the communication device 10 as a longer pulse width.
  • the pulse width of the pulse signal output from the communication device 20-3 farthest from the communication device 10 is the shortest.
  • the pulse width is often recognized by the communication device 10.
  • the communication device 10 outputs a termination resistance setting command to any one communication device 20 in a low-speed communication mode in which setting of a termination resistance is unnecessary.
  • the communication device 10 first causes the communication device 20-1 to set a terminating resistor.
  • the communication device 10 outputs a pulse signal (test signal) to each of the communication devices 20 and its own communication device 10. Then, each communication device 20 and the communication device 10 acquires the pulse signal output from the communication device 10. Then, each of the communication devices 20 and 10 measures and records the pulse width of the acquired pulse signal.
  • the communication device 10 outputs a pulse signal output command to the communication device 20-1.
  • the communication device 20-1 outputs pulse signals to all the communication devices 20 and its own communication device 10.
  • each of the communication devices 20 and 10 acquires the pulse signal output from the communication device 20-1.
  • each communication device 20 and communication device 10 measures and records the pulse width of the acquired pulse signal.
  • the communication device 10 sequentially outputs the pulse signal output command to the communication device 20-2 and the communication device 20-3.
  • the pulse widths of the pulse signals output from the communication devices 20-2 and 20-3 are measured and recorded in the communication devices 20 and 10 respectively.
  • the communication device 10 When the transmission and reception of the pulse signal and the measurement of the pulse width by the communication device 10 and all the communication devices 20 are completed, the communication device 10 outputs a measurement result output command to each communication device 20. As a result, the measurement result information indicating the measurement result of the pulse width recorded by each communication device 20 is output from each communication device 20 to the communication device 10. Thereby, the communication device 10 acquires the measurement result information output from each communication device 20.
  • FIG. 8A is a diagram showing an example of measurement result information collected by the communication device 10 according to the second embodiment.
  • the “communication device (outdoor unit)” is the communication device 10
  • the “first communication device” is the communication device 20-1
  • the “second communication device” is the communication device 20-2
  • the “third device” corresponds to the communication device 20-3, respectively. It is assumed here that the pulse width of the pulse signal output by the communication device 10 and each communication device 20 is “50 [us (microseconds)]”.
  • the pulse width measured when the own communication device 10 acquires the pulse signal output from the communication device 10 is “100 [us]”. It is shown. Since the pulse width of the output pulse signal is 50 [ ⁇ s], it is recognized as a pulse signal having a pulse width twice as long as the pulse signal actually output at the time of acquisition. .. Further, for example, in the measurement result information table tb1 illustrated in FIG. 8A, the pulse width measured when the communication device 20-2 acquires the pulse signal output from the communication device 20-1 is “90 [us]”. Is shown.
  • the communication device 10 outputs a termination resistance setting cancellation command to the communication device 20-1 in which the termination resistance has been set. As a result, the setting of the terminating resistor in the communication device 20-1 is released. Then, the communication device 10 causes the communication device 20-2 to set the terminating resistance. Then, the communication device 10 acquires the measurement result information from each of the communication devices 20 by the same processing as described above.
  • the measurement result information collected by the communication device 10 is stored in the storage unit 125 as a measurement result information table tb2 as shown in FIG. 8B, for example.
  • the communication device 10 cancels the setting of the terminating resistor set in the communication device 20-2. Subsequently, the communication device 10 causes the communication device 20-3 to set the terminating resistance. Then, the communication device 10 acquires the measurement result information from each of the communication devices 20 by the same processing as described above.
  • the measurement result information collected by the communication device 10 is stored in the storage unit 125 as a measurement result information table tb3 as shown in FIG. 8C, for example.
  • the measurement result information table tb1 illustrated in FIG. 8A is a table in which the measurement results of the pulse width when the terminating resistance is set in the communication device 20-1 are collected.
  • the measurement result information table tb2 shown in FIG. 8B and the measurement result information table tb3 shown in FIG. 8C are set when a terminating resistor is set in the communication device 20-2 and when a terminating resistor is set in the communication device 20-3, respectively. It is a table in which the measurement results of the pulse width in the case of being performed are aggregated.
  • the communication device 10 specifies the maximum value of each pulse width when the terminating resistance is set in each communication device 20. That is, the communication device 10 detects the maximum value of the pulse width values included in the measurement result information table tb1, the maximum value of the pulse width values included in the measurement result information table tb2, and the pulse width values included in the measurement result information table tb3. Specify the maximum value.
  • the third communication device (communication device 20-3) outputs a pulse signal and the third communication device of its own acquires it.
  • the pulse width in the case is the maximum value, and the value is “110 [ ⁇ s]”.
  • the maximum value of the pulse width is “90 [ ⁇ s]” as shown in FIG. 8B.
  • the maximum pulse width is “55 [ ⁇ s]” as shown in FIG. 8C.
  • the communication device 10 specifies the communication device 20 to which the terminating resistance is set when the maximum value of these pulse widths is the minimum, as the communication device located at an appropriate position for setting the terminating resistance. That is, in the example shown in FIGS. 8A to 8C, the minimum value among the maximum values of the pulse widths is “55 [ ⁇ s]”, so the communication device 10 sets the communication device 20-3 shown in FIG. It is specified as a communication device located at an appropriate position when setting the terminating resistance.
  • the measured pulse width itself is used as the measurement result, but the present invention is not limited to this.
  • the degree of delay in rising of the pulse signal that is, a value obtained by subtracting 50 ⁇ s, which is the pulse width of the output pulse signal, from the measured pulse width
  • the measurement result may be used as the measurement result.
  • all the communication devices 20 are sequentially set with terminating resistors, all the measurement result information is collected, and the terminating resistors are set based on the measurement result information.
  • the communication device 20 located at an appropriate position is specified above.
  • the terminating resistors are set to all the communication devices 20 sequentially (in a brute force manner) in this way, as the number of communication devices 20 increases, the measurement time exponentially increases and the system load increases. Is assumed. Therefore, for example, a threshold may be set in advance for the maximum value of the pulse width, and the processing may be terminated when the maximum value of the pulse width becomes less than the predetermined value.
  • the communication device 10 may specify the communication device 20 in which the terminating resistance is set at the time of ending the process, as the communication device positioned at an appropriate position in setting the terminating resistance.
  • the communication device 10 includes a terminating resistor 11 and a signal transmission/reception circuit 12s.
  • the terminating resistor 11 is always connected to the communication line 30, which is a two-wire communication line.
  • the communication device 10 functions as a terminating device.
  • the signal transmission/reception circuit 12s is a circuit that transmits/receives signals in communication with each communication device 20.
  • the signal transmission/reception circuit 12s also operates as a termination resistance setting device.
  • the signal transmission/reception circuit 12s is a signal transmission/reception circuit provided in the communication device 10 which is considered to be located closest to one end of the communication line 30 as described above.
  • the signal transmission/reception circuit 12s identifies the communication device 20 located at an appropriate position for setting the terminating resistance.
  • the signal transmission/reception circuit 12s outputs a command to each communication device 20 to control the setting state of the terminating resistor in each communication device 20.
  • the signal transmission/reception circuit 12s includes a control unit 120, a command unit 121s, a communication unit 122, a measurement result information collection unit 124, a storage unit 125, and a determination unit 126. To be done.
  • the control unit 120 controls processing by each functional block included in the signal transmission/reception circuit 12s. For example, the control unit 120 controls transmission/reception of signals in communication with each communication device 20. Further, for example, the control unit 120 controls the output of various commands to each communication device 20 by the command unit 121s.
  • the command unit 121s controls the output of various commands output to each communication device 20.
  • the command unit 121s outputs various commands to each communication device 20 via the communication unit 122.
  • the command unit 121s includes a termination resistance setting command unit 121a, a measurement mode setting command unit 121c, a pulse signal output command unit 121d, and a measurement result output command unit 121e.
  • the termination resistance setting command unit 121a outputs a termination resistance setting command indicating a command for setting the termination resistance to each communication device 20. Further, the terminating resistance setting command unit 121a outputs a terminating resistance setting cancel command indicating a command for canceling the setting of the terminating resistance to the communication device 20 which is the target of outputting the terminating resistance setting command. ..
  • the measurement mode setting command unit 121c indicates to each communication device 20 a command for switching to the measurement mode, which is an operation mode for measuring the pulse width of a pulse signal that is a test signal that is output on a trial basis. Output the measurement mode setting command.
  • the pulse signal output command unit 121d outputs a pulse signal output command to each communication device 20, which indicates a command for outputting a pulse signal to the communication device 10 of itself and each communication device 20.
  • the signal output from each communication device 20 in response to the pulse signal output command is a test signal (pulse signal) that is output on a trial basis.
  • the pulse signal output command may be transmitted by broadcast or multicast.
  • the measurement result output command unit 121e outputs a measurement result output command indicating a command for outputting measurement result information to each communication device 20.
  • the communication unit 122 is a communication interface for making a communication connection with each communication device 20.
  • the communication unit 122 may be a functional unit including a transmission unit and a reception unit, which are configured by separate hardware.
  • the communication unit 122 Under the control of the control unit 120, the communication unit 122 outputs various signals (for example, pulse signals) to each communication device 20 via the communication line 30. It should be noted that various signals also include signals output from the instruction unit 121 and indicating the above-mentioned termination resistance setting instruction, measurement mode setting instruction, pulse signal output instruction, and measurement result output instruction.
  • the communication unit 122 is preset so that when outputting a pulse signal (test signal) to each communication device 20, a pulse signal having a predetermined pulse width (for example, 50 ⁇ s) is output accurately. ing.
  • the communication unit 122 also acquires various signals (for example, pulse signals) output from each communication device 20.
  • the measurement result information collecting unit 124 acquires the pulse signal output from each communication device 20 via the communication unit 122.
  • the measurement result information collecting unit 124 measures the pulse width of the acquired pulse signal.
  • the measurement result information collecting unit 124 causes the storage unit 125 to store the measured value of the pulse width of the pulse signal output from each communication device 20.
  • the measurement result information collecting unit 124 stores the measurement value in the storage unit 125 by writing the measurement value in the above-described measurement result information table tb1 to measurement result information table tb3 stored in advance in the storage unit 125.
  • the above-mentioned measured value means each measured value included in the column of “communication device 10 (outdoor unit)” in the column of “reception” (that is, “100[ ⁇ s]”, “85 [ ⁇ s]”, “75 [ ⁇ s]”, and “55 [ ⁇ s]”).
  • the measurement result information collecting unit 124 acquires the measurement result information output from each communication device 20 via the communication unit 122.
  • the measurement result information collecting unit 124 stores the measurement result information output from each communication device 20 in the storage unit 125.
  • the measurement result information collecting unit 124 stores the measurement result information in the storage unit 125 by writing the measurement result information in the above-described measurement result information table tb1 to measurement result information table tb3 stored in advance in the storage unit 125.
  • the above-mentioned measurement result information is a measurement value group of each column included in the column of “reception” (that is, the column of “first communication device 20-1”). Measurement value group, the measurement value group in the “second communication device 20-2” column, and the measurement value group in the “third communication device 20-3” column).
  • the storage unit 125 stores various programs and data tables used in the signal transmission/reception circuit 12s.
  • the determination unit 126 determines which communication device 20 is located at an appropriate position for setting the terminating resistance, based on the measurement result information collected by the measurement result information collection unit 124. Specifically, the determination unit 126 is suitable for setting the terminating resistance of the communication device 20 in which the terminating resistance is set when the maximum value of the pulse width is the minimum among the collected measurement result information. It is specified as the communication device at the position.
  • FIG. 10 is a block diagram showing a functional configuration of the communication device 20 according to the second embodiment.
  • the functional configurations of the communication devices 20 are the same, and FIG. 10 illustrates only the communication devices 20-2 and 20-3 as an example.
  • the communication device 20 is configured to include a termination resistance setting unit 21 and a signal transmission/reception circuit 22s.
  • the signal transmission/reception circuit 22s is a circuit that transmits/receives signals in communication with the communication device 10.
  • the signal transmission/reception circuit 22s includes a control unit 220, a communication unit 221, a storage unit 224, an operation mode switching unit 225, a measurement unit 226, and a measurement result output unit 227.
  • the termination resistance setting unit 21 is configured to include a termination resistance.
  • the termination resistance setting unit 21 switches to the state (ON state) in which the termination resistor is set under the control of the control unit 220. ..
  • the terminating resistance setting unit 21 is in a state (OFF (OFF)) in which the terminating resistor is not set by the control of the control unit 220. State).
  • the control unit 220 controls the processing by each functional block of the signal transmission/reception circuit 22 and the operation of the termination resistance setting unit 21. Thereby, for example, the control unit 220 controls transmission/reception of signals in communication between the communication device 10 and each of the other communication devices 20.
  • the communication unit 221 is a communication interface for communicatively connecting to the communication device 10 and each communication device 20.
  • the communication unit 221 may be a functional unit including a transmission unit and a reception unit, which are configured by separate hardware.
  • the communication unit 221 acquires various signals (for example, pulse signals) output from the communication device 10 or each communication device 20. It should be noted that the various signals also include signals that are output from the above-described communication device 10 and indicate the termination resistance setting command, the measurement mode setting command, the pulse signal output command, and the measurement result output command. The communication unit 221 also outputs various signals (for example, pulse signals) to the communication device 10 or each communication device 20. The communication unit 221 also outputs the measurement result information to the communication device 10.
  • various signals also include signals that are output from the above-described communication device 10 and indicate the termination resistance setting command, the measurement mode setting command, the pulse signal output command, and the measurement result output command.
  • the communication unit 221 also outputs various signals (for example, pulse signals) to the communication device 10 or each communication device 20.
  • the communication unit 221 also outputs the measurement result information to the communication device 10.
  • the storage unit 224 stores various programs used in the signal transmission/reception circuit 22s.
  • the storage unit 224 also stores measurement result information indicating the measurement result of the pulse width of the pulse signal measured by the communication unit 221.
  • the operation mode switching unit 225 switches the operation mode to the measurement mode when the measurement mode setting command output from the communication device 10 is acquired via the communication unit 221.
  • the measurement mode is an operation mode in which a pulse signal that is a test signal is transmitted and received between the communication device 10 and each communication device 20 and the pulse width of the acquired pulse signal is measured.
  • the measuring unit 226 acquires the pulse signals output from the communication device 10 and the communication devices 20 via the communication unit 221.
  • the measurement unit 226 measures the pulse width of the acquired pulse signal.
  • the measurement unit 226 stores the measured value of the pulse width of the pulse signal output from the communication device 10 and each communication device 20 in the storage unit 224 as the measurement result information.
  • the measurement result output unit 227 acquires the measurement result output command output from the communication device 10
  • the measurement result output unit 227 outputs the measurement result information stored in the storage unit 224 to the communication device 10 via the communication unit 221.
  • FIG. 11 is a flowchart showing the operation of the communication device 10 according to the second embodiment.
  • the communication device 20-1 is the first communication device
  • the communication device 20-2 is the second communication device.
  • the control unit 120 substitutes 1 into the value of “i” indicating the number of the communication device 20 (S201).
  • the value of “i” is stored and updated in the storage unit 125, for example. Then, every time the following processing of S202 to S212 is executed, the control unit 120 adds 1 to the value of “i”, and the repeated processing is executed.
  • the termination resistance setting instruction unit 121a outputs a termination resistance setting instruction to the i-th communication device (S202).
  • the control unit 120 substitutes 0 into the value of “j” indicating the numbers of the communication device 10 and the communication device 20 (S203).
  • the value of “j” is stored and updated in the storage unit 125, for example. Then, each time the processing of S204 to S210 described below is executed, the control unit 120 adds 1 to the value of “j” and the processing is repeated.
  • the measurement mode setting command unit 121c outputs a measurement mode setting command to each communication device 20 via the communication unit 122 (S204).
  • the communication unit 122 When the value of “j” is 0 (S205 Yes), the communication unit 122 outputs a pulse signal (test signal) to each communication device 20 (S206).
  • the pulse signal output command unit 121d outputs the pulse signal output command to each communication device 20 via the communication unit 122 (S207). ..
  • the measurement result information collection unit 124 measures the pulse width of each pulse signal acquired via the communication unit 122, and records the measured value in the measurement result information table stored in the storage unit 125 (S208).
  • the measurement result output command unit 121e outputs a measurement result output command to each communication device 20 via the communication unit 122 (S209).
  • the measurement result information collection unit 124 acquires the measurement result information output from each communication device 20 via the communication unit 122 (S210).
  • the control unit 120 adds 1 to the value of “j” and repeats the processing from S204 onward.
  • the determination unit 126 determines that the pulse width included in the acquired measurement result information. Of the measured values of 1, the maximum value is recorded in the storage unit 125 (S211). Then, the termination resistance setting instruction unit 121a outputs a termination resistance setting cancellation instruction to each communication device 20 via the communication unit 122 (S212).
  • the control unit 120 adds 1 to the value of “i” and repeats the processing from S202 above.
  • the determination unit 126 determines the minimum value of the plurality of maximum values recorded in the storage unit 125. Identify. Then, the determining unit 126 identifies the communication device 20 (hereinafter, referred to as “i-best communication device”) for which the terminating resistance is set when the minimum value is obtained (S213).
  • the termination resistance setting command unit 121a outputs the termination resistance setting command to the specified i-best communication device via the communication unit 122 (S214). This is the end of the process shown in the flowchart of FIG.
  • the operation of the communication device 20 will be described below with reference to the flowcharts of the operation of the communication device 20 according to the second embodiment shown in FIGS.
  • the operation of the communication device 20 when the communication device 10 outputs a termination resistance setting command to the communication device 20 and the operation of the communication device 20 when the communication device 10 outputs a termination resistance setting cancellation command to the communication device 20.
  • the operation is the same as that of the first embodiment, so the description is omitted.
  • FIG. 12 shows the operation of the communication device 20 when a measurement mode setting command is output from the communication device 10 to the communication device 20.
  • the operation mode switching unit 225 acquires the measurement mode setting command output from the communication device 10 via the communication unit 221 (S301).
  • the operation mode switching unit 225 switches the operation mode to the measurement mode (S302). This prepares the communication device 20 for measuring the pulse width.
  • the communication unit 221 When the communication unit 221 has not acquired at least one pulse signal of the pulse signals output from the communication device 10 and each communication device 20 (No in S303), the communication unit 221 has not acquired the pulse signal. Await. On the other hand, when the communication unit 221 acquires all pulse signals output from the communication device 10 and each communication device 20 (S303 Yes), the measurement unit 226 measures the pulse width of each acquired pulse signal, The measured value is recorded in the storage unit 224 as measurement result information (S304). Then, the operation mode switching unit 225 switches the operation mode from the measurement mode to the normal mode which is the normal mode (S305). This is the end of the process shown in FIG.
  • FIG. 13 shows the operation of the communication device 20 when a pulse signal output command is output from the communication device 10 to the communication device 20.
  • the communication unit 221 acquires the pulse signal output command output from the communication device 10 (S401).
  • the communication unit 221 outputs a pulse signal having a predetermined pulse width (for example, 50 [ ⁇ s]) to the communication device 10 and each communication device 20 (S402). This is the end of the process shown in the flowchart of FIG.
  • FIG. 14 shows the operation of the communication device 20 when a measurement result output command is output from the communication device 10 to the communication device 20.
  • the measurement result output unit 227 acquires the measurement result output command output from the communication device 10 via the communication unit 221 (S501).
  • the measurement result output unit 227 outputs the measurement result information recorded in the storage unit 224 to the communication device 10 via the communication unit 221. (S502). This is the end of the process shown in the flowchart of FIG.
  • the air conditioning system 100 determines the plurality of communication devices 20 that are communicatively connected, and the communication device 10 (setting device) that determines the communication device for setting the termination resistance. ), and have.
  • the communication device 20 includes a communication unit 221 that performs communication (test communication) with all of the plurality of communication devices (communication device 10 and communication device 20 ), and all of the plurality of communication devices (communication device 10 in communication (test communication)).
  • a measurement unit 226 that outputs the pulse width of the pulse signal (test signal) acquired from the communication device 20) and measurement result information indicating the pulse width measured by the measurement unit 226. Measurement result output unit 227 for outputting to a device).
  • the communication device 10 (setting device) has an instruction unit 121 for temporarily setting the terminating resistance for all of the plurality of communication devices 20, and each time the terminating resistance is provisionally set for each of the communication devices 20.
  • a measurement result information collecting unit 124 that collects measurement result information from all of the plurality of communication devices 20, and a communication device that sets a terminating resistance based on the plurality of measurement result information collected by the measurement result information collecting unit 124.
  • a determining unit 126 that determines 20.
  • the communication device 10 (master device) is installed at the end position of the communication line 30, and the communication device 10 (master device) always has a function as a terminating resistor in advance.
  • the configuration is not limited to this.
  • the communication devices installed at both ends of the communication line 30 are the communication devices 20 (slave devices), and one of the communication devices 20 (slave device) always has a function as a terminating resistor in advance. Even with such a configuration, the method of identifying the appropriate setting position of the terminating resistor according to the first embodiment and the second embodiment described above can be applied.
  • the termination according to the above-described first and second embodiments is performed. It is possible to apply a method of specifying an appropriate setting position of the resistance.
  • the communication device 10 collects the measurement result information while temporarily setting the terminating resistances for any two communication devices among the communication device 10 and each of the communication devices 20, and sets the terminating resistances. It suffices to identify two appropriate positions with.
  • FIG. 15 is an overall configuration diagram of an air conditioning system 200 according to a modified example of the embodiment.
  • the configuration of the air conditioning system 200 according to the modified example of the embodiment shown in FIG. 15 is different from the configuration of the air conditioning system 100 according to the first embodiment shown in FIG. 15 is that the communication device 10 is branched (at the position of the communication device 10) and that the communication device 20-4 and the communication device 20-5 are further provided.
  • the communication line 30 is branched as described above, the method of identifying the appropriate setting position of the terminating resistor according to the first embodiment and the second embodiment described above can be applied. ..
  • the signal reflection is targeted as a factor for changing the signal waveform of the pulse signal in order to simplify the description.
  • the signal waveform changes depending on the length of the communication line 30 and the number of intervening communication devices 20. For example, as the length of the communication line 30 increases, the resistance component may attenuate the amplitude of the pulse signal, or the capacitance component may change the gradient.
  • the pulse width becomes narrower so that the pulse width becomes narrower. Changes. As a result, the accuracy of identifying the appropriate setting position of the terminating resistor in the second embodiment described above becomes higher.
  • the signal used is a pulse signal having a value of 0 and 1, but the signal is not limited to this.
  • a pulse signal composed of values of 0 and 1 as described above. Then, the processing in each of the above-described embodiments may be executed.
  • the communication device 10 is configured to have both the function of setting the terminating resistance for the communication device 20 and the function similar to that of the communication device 20. This simplifies the circuit component for communication and the control process of communication.
  • the configuration is not limited to such a configuration, and, for example, by providing these two functions as separate devices, a device having only the function of setting the terminating resistance for the communication device 20 is separately provided. It may be configured.
  • a part or all of the communication device 10 and the communication device 20 in the above-described embodiment may be realized by a computer.
  • the program for realizing this function may be recorded in a computer-readable recording medium, and the program recorded in this recording medium may be read by a computer system and executed.
  • the “computer system” mentioned here includes an OS and hardware such as peripheral devices.
  • the “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, or a storage device such as a hard disk built in a computer system.
  • the "computer-readable recording medium” means that a program is dynamically held for a short time like a communication line when the program is transmitted through a network such as the Internet or a communication line such as a telephone line.
  • a volatile memory inside the computer system that serves as a server or a client in that case may hold the program for a certain period of time.
  • the program may be for realizing a part of the functions described above, and may be a program that can realize the functions described above in combination with a program already recorded in the computer system, It may be realized by using hardware such as PLD (Programmable Logic Device) and FPGA (Field Programmable Gate Array).

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Abstract

Un dispositif de réglage de résistance de terminal selon la présente invention comporte une unité de communication et une unité d'instruction de réglage de résistance de terminal. L'unité de communication exécute une communication de test avec une pluralité de dispositifs de communication qui sont connectés de manière communicative. Lorsque l'unité d'instruction de réglage de résistance de terminal amène l'un quelconque de la pluralité des dispositifs de communication à régler une résistance de terminal et que la communication de test n'est pas établie, l'unité d'instruction de réglage de résistance de terminal amène ce dispositif de communication à annuler le réglage de la résistance de terminal et ensuite amène l'un quelconque des autres dispositifs de communication à régler la résistance de terminal.
PCT/JP2019/004826 2019-02-12 2019-02-12 Dispositif de réglage de résistance de terminal et système de réglage de résistance de terminal WO2020165937A1 (fr)

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JP2020571936A JP7277488B2 (ja) 2019-02-12 2019-02-12 終端抵抗設定装置及び終端抵抗設定システム

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