Communication systems and communication methods

Abstract

A communication system is provided that allows monitoring of the status of wind and hydraulic equipment at any desired time while minimizing the power consumption of sensor devices. [Solution] The communication system includes a sensor device. The sensor device includes a receiver that sends a start signal to the measurement controller to switch the operating mode of the measurement controller from power-saving mode to start mode.

Description

Technical Field

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[0001] The present invention relates to a communication system and a communication method.

Background Art

[0002] Generally, based on signals detected by sensors attached to hydroelectric and wind power equipment including rotating equipment such as pumps and blowers, the state of the hydroelectric and wind power equipment is monitored.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] [[ID=​​​​​​​​​​​ Therefore, the present invention aims to provide a communication system and communication method that can monitor the status of a wind and hydraulic equipment at any desired time while suppressing the power consumption of the sensor device. [Means for solving the problem]

[0008] In one embodiment, a communication system is provided. The communication system comprises a sensor device electrically connected to a sensor that detects a sensor signal reflecting a physical quantity generated by the operation of a wind and hydraulic machine, and a monitoring device electrically connected to the sensor device, wherein the sensor device comprises a measurement controller that measures the physical quantity based on the sensor signal, and a receiver that sends a start signal to the measurement controller to switch the operating mode of the measurement controller from a power-saving mode to a start mode based on a call signal from the monitoring device.

[0009] In one embodiment, the communication system includes a relay that electrically connects the sensor device and the monitoring device, and the monitoring device sends the call signal to the receiver through the relay. In one embodiment, the measurement controller sends the measured physical quantity to the monitoring device, and then switches the operating mode back from the startup mode to the power saving mode. In one embodiment, the communication system includes a relay that electrically connects the sensor device and the monitoring device, and, if the sensor device is defined as a first sensor device, a second sensor device having the same configuration as the first sensor device, wherein the receiver of the second sensor device sends the activation signal to the measurement controller of the second sensor device based on a call signal sent from the monitoring device through the relay and the first sensor device, respectively.

[0010] In one embodiment, when the sensor device is defined as a first sensor device, the communication system includes a second sensor device having the same configuration as the first sensor device, the first sensor device sends a call signal to the receiver of the second sensor device based on measurement data created by the measurement controller of the first sensor device, and the receiver of the second sensor device sends the activation signal to the measurement controller of the second sensor device based on the call signal sent from the first sensor device. In one embodiment, when the sensor device is defined as a first sensor device, the communication system includes a second sensor device having the same configuration as the first sensor device, the monitoring device sends a call instruction signal to the receiver of the first sensor device, the first sensor device sends a call signal to the receiver of the second sensor device based on the call instruction signal, and the receiver of the second sensor device sends the activation signal to the measurement controller of the second sensor device based on the call signal. In one embodiment, the receiver corresponds to a low-power radio receiver that receives an OOK (On-Off Keying) modulated signal.

[0011] In one embodiment, a communication method using a communication system is provided. The communication method involves a measurement controller of a sensor device electrically connected to a sensor that detects a sensor signal reflecting a physical quantity generated by the operation of a wind and hydraulic equipment, measuring the physical quantity based on the sensor signal, and based on a call signal from a monitoring device electrically connected to the sensor device, a receiver of the sensor device sends a start signal to the measurement controller to switch the operating mode of the measurement controller from power-saving mode to start mode.

[0012] In one embodiment, the monitoring device sends the call signal to the receiver via a relay that electrically connects the sensor device and the monitoring device. In one embodiment, the measurement controller sends the measured physical quantity to the monitoring device, and then switches the operating mode back from the startup mode to the power saving mode. In one embodiment, when the sensor device is defined as a first sensor device, the communication system includes a second sensor device having the same configuration as the first sensor device, and a call signal is sent from the monitoring device through a relay that electrically connects the second sensor device and the monitoring device, and through the first sensor device, and based on the call signal, the receiver of the second sensor device sends the activation signal to the measurement controller of the second sensor device.

[0013] In one embodiment, when the sensor device is defined as a first sensor device, the communication system includes a second sensor device having the same configuration as the first sensor device, and based on the measurement data created by the measurement controller of the first sensor device, the first sensor device sends a call signal to the receiver of the second sensor device, and based on the call signal sent from the first sensor device, the receiver of the second sensor device sends the activation signal to the measurement controller of the second sensor device. In one embodiment, when the sensor device is defined as a first sensor device, the communication system includes a second sensor device having the same configuration as the first sensor device, the monitoring device sends a call instruction signal to the receiver of the first sensor device, the first sensor device sends a call instruction signal to the receiver of the second sensor device based on the call instruction signal, and the receiver of the second sensor device sends the activation signal to the measurement controller of the second sensor device based on the call instruction signal. In one embodiment, the receiver corresponds to a low-power radio receiver that receives an OOK (On-Off Keying) modulated signal. [Effects of the Invention]

[0014] According to the above means, the communication system can monitor the state of the wind and hydraulic equipment at any timing while suppressing the power consumption of the sensor device.

Brief Description of the Drawings

[0015] [Figure 1] It is a diagram showing an embodiment of the communication system. [Figure 2] Fig. 2(a) is a diagram showing an embodiment of the communication network between the sensor device and the monitoring device, and Fig. 2(b) is a diagram showing another embodiment of the communication network between the sensor device and the monitoring device. [Figure 3] It is a diagram showing the components of the sensor device and the repeater. [Figure 4] It is a diagram showing the communication flow when communicating between the sensor device and the monitoring device through the repeater. [Figure 5] It is a diagram showing another embodiment of the communication system. [Figure 6] It is a diagram showing the components of a plurality of sensor devices. [Figure 7] It is a diagram showing an embodiment of the communication flow when communicating a plurality of sensor devices with the monitoring device through the repeater. [Figure 8] It is a diagram showing another embodiment of the communication flow when communicating between a plurality of sensor devices and the monitoring device. [Figure 9] It is a diagram showing a state where the communication situation between the repeater and the receiver of the second sensor device is poor. [Figure 10] It is a diagram showing another embodiment of the communication flow when communicating between a plurality of sensor devices and the monitoring device. [Figure 11] It is a diagram showing another embodiment of the communication system. [Figure 12] It is a diagram showing the communication flow when communicating between the sensor device and the monitoring device in an emergency.

Embodiments for Carrying Out the Invention

[0016] Embodiments of the present invention will be described below with reference to the drawings. In the drawings described below, the same or corresponding components are denoted by the same reference numerals, and redundant descriptions are omitted. In the multiple embodiments described below, the configuration of one embodiment that is not specifically described is the same as that of the other embodiments, so redundant descriptions are omitted.

[0017] Figure 1 shows one embodiment of a communication system. In the embodiment shown in Figure 1, the communication system 1 includes a pump device 10 as an example of a hydraulic wind and water device, and a sensor 20 that detects signals (sensor signals) that reflect physical quantities (e.g., vibration, temperature, pressure, flow rate, etc.) generated by the operation of the pump device 10.

[0018] The pump device 10 includes a pump P for transferring liquid and a motor M for operating the pump P. The pump P is connected to a suction pipe SP at its suction port and to a discharge pipe DP at its discharge port. When the motor M is driven, the impeller (not shown) of the pump P rotates, causing the pump P to draw in liquid through the suction pipe SP and pressurize it. The pressurized liquid is then transferred to the outside through the discharge pipe DP.

[0019] Other examples of wind and hydraulic equipment include blowers, turbines, and compressors. Examples of sensors 20 include vibration sensors, temperature sensors, pressure sensors, and flow sensors.

[0020] The communication system 1 further includes a sensor device 30 electrically connected to the sensor 20, and a monitoring device 50 electrically connected to the sensor device 30. In the embodiment shown in Figure 1, the communication system 1 includes a repeater 40 that electrically connects the sensor device 30 and the monitoring device 50.

[0021] The monitoring device 50 is equivalent to a server device that monitors the status of the pump device 10, issues commands to the operation of the pump device 10, and manages the data based on the data sent from the sensor device 30. The repeater 40 connected to the monitoring device 50 is positioned to extend the communication network between the monitoring device 50 and the sensor device 30. By positioning the repeater 40, the monitoring device 50 can access the sensor device 30 of the remotely located pump device 10 via the repeater 40.

[0022] Figure 2(a) shows one embodiment of a communication network between a sensor device and a monitoring device, and Figure 2(b) shows another embodiment of a communication network between a sensor device and a monitoring device. As shown in Figure 2(a), the communication system 1 has a communication network formed between a sensor device 30, a repeater 40, and a monitoring device 50. As shown in Figure 2(b), the communication system 1 does not necessarily need to include a repeater 40, and may have a communication network formed between the sensor device 30 and the monitoring device 50.

[0023] As described above, it is necessary to communicate between the sensor device 30 and the monitoring device 50 while minimizing the power consumption of the sensor device 30 as much as possible. On the other hand, it is desirable that the monitoring device 50 acquires data from the sensor device 30 and monitors the status of the pump device 10 at any time without sacrificing communication responsiveness. Therefore, a configuration that allows monitoring of the status of the pump device 10 at any time while minimizing the power consumption of the sensor device 30 will be described below.

[0024] Figure 3 shows the components of the sensor device and the repeater. As shown in Figure 3, the sensor device 30 includes a measurement controller 32 that measures a physical quantity of the pump device 10 based on a sensor signal detected by the sensor 20, and a receiver 31 that sends a start signal to the measurement controller 32 to switch the operating mode of the measurement controller 32 from power-saving mode to start mode based on a call signal from the monitoring device 50. Power-saving mode is an operating mode that consumes less power than start mode.

[0025] In the embodiment shown in Figure 3, the sensor device 30 includes a communication device 33 that communicates with the repeater 40. If the communication system 1 does not include the repeater 40, the communication device 33 communicates with the monitoring device 50. The communication device 33 is a wireless communication device configured to send and receive data wirelessly.

[0026] The repeater 40 includes a communication device 41 electrically connected to the receiver 31 and the communication device 33, and an operation controller 42 that controls the operation of the communication device 41. The communication device 41, like the communication device 33, is a wireless receiver.

[0027] The motion controller 42 is configured to operate according to commands from the monitoring device 50 and to send and receive data to and from the sensor device 30 via the communication device 41. The motion controller 42 is, for example, a microcomputer and has at least a memory for storing a program and a processor for performing calculations according to the program.

[0028] The measurement controller 32 is, for example, a microcomputer and, like the operation controller 42, has at least memory and a processor. The measurement controller 32 is connected to the receiver 31 and the communication device 33 and is configured to operate based on signals sent from the receiver 31.

[0029] Furthermore, the measurement controller 32 is configured to send measurement data measured based on sensor signals to the monitoring device 50 via the communication device 33 (and the communication device 41 of the repeater 40). The measurement controller 32 is configured to be switchable between a power-saving mode and a startup mode. Normally, the measurement controller 32 is kept in power-saving mode to reduce its own power consumption.

[0030] Figure 4 shows the communication flow when a sensor device and a monitoring device communicate through a repeater. In the embodiment shown in Figure 4, the monitoring device 50 switches the operating mode of the measurement controller 32 from power saving mode to startup mode. As shown in step S101 of Figure 4, the monitoring device 50 sends a call signal to the receiver 31 of the sensor device 30 through the communication device 41 of the repeater 40 in accordance with a command from the user.

[0031] The call signal is a signal that instructs the measurement controller 32 to send a start signal from the receiver 31. The start signal is a signal that switches the operating mode of the measurement controller 32 from power-saving mode to start mode when the receiver 31 receives the call signal.

[0032] For example, receiver 31 corresponds to a low-power radio receiver (in other words, an LP Receiver) that receives OOK (On-Off Keying) modulated signals. Receiver 31 is configured to constantly receive call signals sent from monitoring device 50 via the communication device 41 of repeater 40.

[0033] Upon receiving a call signal, the receiver 31 sends a start signal to the measurement controller 32 (see step S102). When the measurement controller 32 receives the start signal from the receiver 31, it switches the operating mode from power-saving mode to start mode.

[0034] After being activated, the measurement controller 32 acquires sensor signals from the sensor 20, measures the physical quantities of the pump device 10 based on the sensor signals, and creates measurement data (see step S103).

[0035] After creating the measurement data, the measurement controller 32 sends the measurement data to the communication device 41 of the repeater 40 via the communication device 33 (see step S104). The repeater 40 sends the acquired measurement data to the monitoring device 50. The monitoring device 50 monitors the status of the pump device 10 based on the measurement data created by the sensor device 30.

[0036] After step S104, the measurement controller 32 switches its operating mode from the start mode to the power saving mode (see step S105). In this way, the measurement controller 32 switches the operating mode from the power saving mode to the start mode based on the start signal from the receiver 31, performs the necessary operations, and then switches the operating mode back from the start mode to the power saving mode.

[0037] According to this embodiment, the communication system 1 does not need to keep the measurement controller 32 running at all times, but is configured to be started at any time as needed to send measurement data to the monitoring device 50. Therefore, the communication system 1 can monitor the status of the pump device 10 at any time while keeping the power consumption of the sensor device 30 equipped with the measurement controller 32 low.

[0038] Figure 5 shows another embodiment of the communication system. In the embodiment shown in Figure 5, the communication system 1 comprises a plurality of sensors 20A, 20B and a plurality of sensor devices 30A, 30B electrically connected to these sensors 20A, 20B. For convenience of explanation, sensors 20A, 20B may be collectively referred to as sensor 20, and similarly, sensor devices 30A, 30B may be collectively referred to as sensor device 30.

[0039] In the embodiment shown in Figure 5, sensor 20A is attached to the pump device 10, and sensor 20B is connected to the discharge pipe DP. Sensor 20A is, for example, a vibration sensor, and sensor 20B is, for example, a pressure sensor or a flow sensor. Thus, as long as the sensor 20 can detect sensor signals resulting from the operation of the pump device 10, it does not necessarily have to be attached to the pump device 10 itself.

[0040] Figure 6 shows the components of multiple sensor devices. Sensor devices 30A and 30B have basically the same configuration. Specifically, sensor devices 30A and 30B are each equipped with receivers 31A and 31B, measurement controllers 32A and 32B, and communication devices 33A and 33B.

[0041] The repeater 40 is connected to both sensor devices 30A and 30B. The monitoring device 50 can access each of the sensor devices 30A and 30B through the repeater 40 and acquire measurement data from each of them. For the sake of explanation, sensor device 30A may be referred to as the first sensor device 30A and sensor device 30B as the second sensor device 30B.

[0042] Figure 7 shows one embodiment of the communication flow when multiple sensor devices and a monitoring device communicate through a repeater. As shown in step S201 of Figure 7, the monitoring device 50 sends a call signal to the receiver 31B of the second sensor device 30B through the communication device 41 of the repeater 40 and the communication device 33A of the first sensor device 30A.

[0043] In the embodiment shown in Figure 7, even if the communication between either the communication device 41 of the repeater 40 or the communication device 33A of the first sensor device 30A and the receiver 31B of the second sensor device 30B is poor, the monitoring device 50 can reliably send a call signal to the receiver 31B of the second sensor device 30B.

[0044] After step S201, the receiver 31B of the second sensor device 30B, which has received a call signal from at least one of the communication devices 41 and 33A, sends a start signal to the measurement controller 32B of the second sensor device 30B (see step S202).

[0045] Based on the activation signal from the receiver 31B, the measurement controller 32B switches the operating mode to activation mode and acquires the sensor signal from the sensor 20B. Subsequently, the measurement controller 32B creates measurement data based on the sensor signal (see step S203).

[0046] The measurement controller 32B sends the measurement data to the repeater 40 via the communication device 33B of the second sensor device 30B (see step S204), and the repeater 40 sends the measurement data to the monitoring device 50 via the communication device 41. After step S204, the measurement controller 32B switches the operating mode from startup mode to power saving mode (see step S205).

[0047] Figure 8 shows another embodiment of the communication flow when multiple sensor devices communicate with a monitoring device. In the embodiment shown in Figure 8, the monitoring device 50 can acquire measurement data from each of the sensor devices 30A and 30B simultaneously or at the same time. Here, "at the same time" does not necessarily mean "simultaneously," but includes a slight time difference (i.e., the same time series).

[0048] For example, consider a scenario where sensor 20A detects an abnormal signal. In this case, while there is a possibility of a malfunction in sensor 20A, there is also a possibility that an actual malfunction has occurred in the pump device 10, such as a blockage in pump P. Therefore, the measurement controller 32A is configured to activate the adjacent sensor device 30B when the measurement data exceeds (or falls below) a predetermined threshold, or when the measurement data indicates that the pump device 10 has stopped operating.

[0049] First, the measurement controller 32A of the first sensor device 30A is activated based on the activation signal from the receiver 31A, and then creates measurement data (first measurement data) based on the sensor signal (see step S301). Subsequently, the measurement controller 32A decides whether or not to send a call signal to the receiver 31B of the second sensor device 30B based on the measurement data.

[0050] When the measurement controller 32A decides to send a call signal to the receiver 31B, the measurement controller 32A sends the call signal to the receiver 31B of the second sensor device 30B through the communication device 33A of the first sensor device 30A (see step S302).

[0051] When receiver 31B receives a call signal, it sends a start signal to measurement controller 32B of the second sensor device 30B (see step S303). Measurement controller 32B switches the operating mode from power saving mode to start mode and creates measurement data (second measurement data) based on the sensor signal from sensor 20B (see step S304).

[0052] Measurement controllers 32A and 32B send the first measurement data and the second measurement data simultaneously or at the same time through communication devices 33A and 33B (see step S305).

[0053] In one embodiment, the measurement controller 32A may send the first measurement data at the time of step S302 (i.e., the timing when it sends a call signal to the receiver 31B of the second sensor device 30B), and then the measurement controller 32B may send the second measurement data.

[0054] With this configuration, the communication system 1 can monitor the precise status of the pump device 10 not only based on measurement data measured by one sensor device 30, but also based on multiple measurement data measured by multiple sensor devices 30.

[0055] Figure 9 shows a situation where communication between the repeater and the receiver of the second sensor device is poor. Figure 10 shows another embodiment of the communication flow when multiple sensor devices communicate with a monitoring device. As shown in Figure 9, we assume a situation where communication between the repeater 40 and the receiver 31B of the second sensor device 30B is poor. In this case, the monitoring device 50 cannot send a call signal directly to the receiver 31B through the communication device 41 of the repeater 40.

[0056] Therefore, as shown in step S401 of Figure 10, the monitoring device 50 sends a call instruction signal to the receiver 31A of the first sensor device 30A through the communication device 41 of the repeater 40. The call instruction signal is a signal that instructs the receiver 31 of a predetermined sensor device 30 to send a call signal. The receiver 31 that receives the call instruction signal is configured to send a call signal to the receiver 31 of the predetermined sensor device 30.

[0057] When receiver 31A receives a call instruction signal, receiver 31A switches the operating mode of measurement controller 32A to the start mode. Measurement controller 32A sends a call signal to receiver 31B of the second sensor device 30B via communication device 33A (see step S402).

[0058] Subsequently, the receiver 31B sends a start signal to the measurement controller 32B (see step S403), switching the operating mode of the measurement controller 32B from power-saving mode to start mode.

[0059] In the embodiments shown in Figures 9 and 10, the receiver 31A is configured to send a call signal to the receiver 31B via the measurement controller 32A. However, if the call signal can be sent to the receiver 31B via the communication device 33A, it is not necessarily required to activate the measurement controller 32A. In one embodiment, when the receiver 31A receives a call instruction signal, it may send the call signal directly to the receiver 31B via the communication device 33A, without going through the measurement controller 32A.

[0060] Figure 11 shows another embodiment of the communication system. As shown in Figure 11, the communication system 1 does not necessarily have to include two sensor devices 30, but may include at least three sensor devices 30 (i.e., sensor devices 30A, 30B, and 30C). Each sensor device 30 has basically the same configuration. Therefore, sensor device 30C is connected to sensor 20C and includes a receiver 31C, a measurement controller 32C, and a communication device 33C.

[0061] Figure 12 shows the communication flow when a sensor device and a monitoring device communicate in an emergency. In the embodiment described above, the communication flow for acquiring measurement data from the sensor device 30 at any time based on a command from the monitoring device 50 was explained, but in the embodiment shown in Figure 12, the communication system 1 is configured to forcibly switch the operating mode of the measurement controller 32 from power saving mode to startup mode.

[0062] As shown in step S501 of Figure 12, if the sensor 20 detects an abnormal signal, the sensor 20 sends the abnormal signal to the measurement controller 32. Upon receiving the abnormal signal, the measurement controller 32 forcibly switches the operating mode from power-saving mode to startup mode (see step S502) and sends the measurement data to the repeater 40 via the communication device 33 (see step S503). The repeater 40 sends the measurement data to the monitoring device 50 via the communication device 41. At this time, the monitoring device 50 receives the measurement data and may also issue an alarm.

[0063] The embodiments described above are intended to enable persons with ordinary skill in the art to implement the present invention. Various modifications of the above embodiments can be made naturally by those skilled in the art, and the technical idea of ​​the present invention can be applied to other embodiments as well. Therefore, the present invention is not limited to the embodiments described, but is to be interpreted in the broadest sense according to the technical idea defined by the claims. [Explanation of symbols]

[0064] 1. Communication System 10 Pumping device 20 (20A, 20B, 20C) Sensors 30 (30A, 30B, 30C) Sensor Devices 31 (31A, 31B, 31C) Receiver 32 (32A, 32B, 32C) Measurement Controller 33(33A,33B,33C) Communication equipment 40 Repeaters 41 Communication equipment 42. Operation Controller 50 Monitoring equipment P Pump M Motor SP suction pipe DP discharge pipe

Claims

1. It is a communication system, A sensor device electrically connected to a sensor that detects a sensor signal that reflects a physical quantity generated by the operation of a wind and hydraulic equipment, The sensor device is electrically connected to a monitoring device, The aforementioned sensor device, A measurement controller that measures the physical quantity based on the sensor signal, A communication system comprising: a receiver that sends a start signal to the measurement controller for switching the operating mode of the measurement controller from power-saving mode to start mode based on a call signal from the monitoring device.

2. The communication system includes a relay that electrically connects the sensor device and the monitoring device. The communication system according to claim 1, wherein the monitoring device sends the call signal to the receiver through the relay.

3. The communication system according to claim 1, wherein the measurement controller sends the measured physical quantity to the monitoring device, and then switches the operating mode again from the startup mode to the power saving mode.

4. The aforementioned communication system A relay that electrically connects the sensor device and the monitoring device, If the aforementioned sensor device is defined as the first sensor device, then the system includes a second sensor device having the same configuration as the first sensor device. The communication system according to claim 1, wherein the receiver of the second sensor device sends the activation signal to the measurement controller of the second sensor device based on the call signal sent from the monitoring device through the relay and the first sensor device, respectively.

5. If the aforementioned sensor device is defined as the first sensor device, the communication system includes a second sensor device having the same configuration as the first sensor device. The first sensor device sends a call signal to the receiver of the second sensor device based on the measurement data created by the measurement controller of the first sensor device. The communication system according to claim 1, wherein the receiver of the second sensor device sends the activation signal to the measurement controller of the second sensor device based on the call signal sent from the first sensor device.

6. If the aforementioned sensor device is defined as the first sensor device, the communication system includes a second sensor device having the same configuration as the first sensor device. The monitoring device sends a call instruction signal to the receiver of the first sensor device. The first sensor device sends a call signal to the receiver of the second sensor device based on the call instruction signal. The communication system according to claim 1, wherein the receiver of the second sensor device sends the activation signal to the measurement controller of the second sensor device based on the call signal.

7. The communication system according to claim 1, wherein the receiver corresponds to a low-power wireless receiver that receives an OOK (On-Off Keying) modulated signal.

8. A communication method using a communication system, A measurement controller of a sensor device electrically connected to a sensor that detects a sensor signal reflecting a physical quantity generated by the operation of a wind and hydraulic equipment measures the physical quantity based on the sensor signal. A communication method comprising sending a start signal to the measurement controller via a receiver of the sensor device, based on a call signal from a monitoring device electrically connected to the sensor device, to switch the operating mode of the measurement controller from power-saving mode to start mode.

9. The communication method according to claim 8, wherein the monitoring device sends the call signal to the receiver via a relay that electrically connects the sensor device and the monitoring device.

10. The communication method according to claim 8, wherein the measurement controller sends the measured physical quantity to the monitoring device, and then switches the operating mode back from the startup mode to the power saving mode.

11. If the aforementioned sensor device is defined as the first sensor device, the communication system includes a second sensor device having the same configuration as the first sensor device. A call signal is sent from the monitoring device through the relay that electrically connects the second sensor device and the monitoring device, and through the first sensor device, The communication method according to claim 8, wherein, based on the call signal, the receiver of the second sensor device sends the activation signal to the measurement controller of the second sensor device.

12. If the aforementioned sensor device is defined as the first sensor device, the communication system includes a second sensor device having the same configuration as the first sensor device. Based on the measurement data created by the measurement controller of the first sensor device, the first sensor device sends a call signal to the receiver of the second sensor device. The communication method according to claim 8, wherein the receiver of the second sensor device sends the activation signal to the measurement controller of the second sensor device based on the call signal sent from the first sensor device.

13. If the aforementioned sensor device is defined as the first sensor device, the communication system includes a second sensor device having the same configuration as the first sensor device. The monitoring device sends a call instruction signal to the receiver of the first sensor device. Based on the aforementioned call instruction signal, the first sensor device sends a call signal to the receiver of the second sensor device. The communication method according to claim 8, wherein, based on the call signal, the receiver of the second sensor device sends the activation signal to the measurement controller of the second sensor device.

14. The communication method according to claim 8, wherein the receiver corresponds to a low-power wireless receiver that receives an OOK (On-Off Keying) modulated signal.

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