JP4811224B2 - Data transmission / reception system - Google Patents

Description

  The present invention relates to a data transmission / reception system, and more particularly to a data transmission / reception system suitable for transmitting / receiving a large number of data acquired simultaneously.

  An example of a system for transmitting and receiving information wirelessly is described in Patent Document 1. In the wireless transmission / reception system described in this publication, in order to reduce power consumption by using a battery as a driving source, the master unit and the slave unit using the battery as a power source have a timer whose time coincides. And the subunit | mobile_unit operates a receiving part at regular time based on the time of a timer, and receives the signal from a main | base station. In addition, a signal is transmitted to the parent device at a designated time.

  In Patent Document 2, a vibration recording system for recording a vibration history only when vibration occurs in a building includes a vibration detection accelerometer, a memory, and an IC chip that drives the memory. It is described that the stored acceleration data is transmitted to the outside wirelessly. Further, in Patent Document 3, in order to easily collect physical quantities at many locations, a wireless transmitter is used between computers provided at various locations in a building and strain measurement means provided at beams and columns on each floor. Wireless transmission / reception.

JP 2004-356786 A Japanese Patent Laid-Open No. 2006-3202 JP 2001-338381 A

  Conventionally, when measuring the soundness of the entire building by measuring the distortion and acceleration of the building at a plurality of locations, a dedicated communication cable has been laid for each sensor. Therefore, when installing a large number of sensors, a large amount of time and labor are required for cable laying work. In addition, the measurement start time is shifted for each of a plurality of sensors, and simultaneous measurement is difficult.

  In order to solve such a problem, in Patent Document 1, a slave timer as a sensor unit is provided with a synchronization timer so as to synchronize with the master device so that the measurement time does not shift. However, when the power consumption of the sensor required for one measurement is large and the constant distortion monitoring is necessary as in the case of measurement of the distortion of a building, it is difficult to secure a power source for driving the sensor unit.

  On the other hand, in Patent Document 2, data is observed only when an earthquake or the like occurs without constantly monitoring the building, so that useless data collection and useless power consumption can be suppressed. However, when observing building damage due to earthquakes, etc., data from before the earthquake occurs is also important, and for earthquakes that do not know when they occur, constant observation is also necessary. In Patent Document 2, it is not considered to deal with such a situation.

  Furthermore, in Patent Document 3, data is transmitted to the outside wirelessly only when the wireless transmitter receives a wireless signal indicating a wireless transmission request from the data collection computer, thereby reducing the power consumption of the wireless transmitter. However, even the one described in Patent Document 3 does not sufficiently take into account the power consumption in a sensor that constantly measures strain data and the like.

  The present invention has been made in view of the above-described problems of the prior art. The purpose of the present invention is to continuously acquire data even if the power consumption of the sensor for data acquisition is large in a system for observing many distortions of buildings. In addition, it is to enable transmission and reception of acquired data. Another object of the present invention is to enable synchronous acquisition of data. Still another object of the present invention is to simplify cable laying. The present invention aims to achieve at least one of these objects.

A feature of the present invention that achieves the above object is a data transmission / reception system that acquires data at a remote location and wirelessly transmits the acquired data to a data processing device provided at a data processing location. A plurality of slave units connected to the data recording device and provided with sensors for measurement ; a power line for supplying power to a slave unit adjacent to the data recording device; and a signal line for transmitting and receiving signals; each parallel connected power lines and signal lines from the data acquisition device to the end of the slave unit by providing a power line and a signal line for connecting only between handset adjacent the handset, the data processing device, time information Is sent to each slave unit to synchronize the time of the timer of each slave unit, and the sample measurement command signal is sent to each slave unit. Measure the time from the start of measurement until the measurement result of each slave unit returns, and based on this measurement result, set the data measurement start command time to each slave unit so that the sensor of each slave unit can start synchronous measurement. There is to set.

In this feature, it is desirable to directly transmit / receive data processing locations and remote locations via a plurality of relay stations or not via relay stations, and for this transmission / reception, it is desirable to use an IEEE802.5.4 specification network. Further, the slave unit is configured to measure at least one of a strain sensor and an acceleration sensor that can detect a physical change of the building, a CPU that controls transmission and reception of signals detected by the sensor, and a plurality of slave units. A timer used for synchronization and a memory for storing measurement results, and the data recording device transmits and receives measurement data transmitted from each slave unit, memory for storing the measurement data, and transmission and reception of measurement data. It is preferable to have a CPU to be controlled, a power source that supplies power to a plurality of slave units in parallel , a data processing place, and an antenna that enables wireless transmission and reception.

  In this feature, the data recording device preferably transmits a measurement command from a signal line attached to the data recording device at a different timing to each slave device, and the data recording device receives the measurement command to the slave device. It is preferable that each slave unit can simultaneously start measurement by instructing a later measurement start time and changing this measurement start time in each slave unit.

  According to the present invention, data can be continuously acquired even when the power consumption of the sensor for data acquisition is large, and the acquired data can be transmitted and received. In addition, synchronous acquisition of data is possible. Furthermore, cable laying is simplified.

  Hereinafter, an embodiment of a data transmission / reception system 100 according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing an outline of the data transmission / reception system 100. FIG. 2 is a block diagram of the data transmission / reception system 100 shown in FIG. In the present embodiment, a case where a plurality of strain sensors 12 that detect strain and an acceleration sensor 14 that detects acceleration are arranged on each floor of a building 60 to transmit and receive data will be described as an example.

  On each floor of the building 60 (1F to 3F in FIG. 1), a plurality of slave units 10 each equipped with a strain sensor 12 for measuring strain or an acceleration sensor 14 for measuring acceleration are connected in series at predetermined locations on each floor. ing. Further, at one corner of each floor of the building 60, a data recording device 20 that records data measured by a plurality of slave units 10, 10,.

  A monitoring center 80 for centrally monitoring data observed in a plurality of buildings 60, 60,... Is provided outside the building 60 to be observed, and the buildings 60, 60,. A data processing device 30 for processing the observation data sent from is arranged. In data transmission / reception to the monitoring center 80, a data transmission / reception system between a plurality of buildings 60 is also used. Of the buildings 60 or relay centers that transmit data to the monitoring center 80, the building 60 or relay center that is closest to the monitoring center 80 is within a radio communication range of about 1 km from the monitoring center.

  Electricity is supplied from a commercial power source to the data recording devices 20 arranged on each floor of the observation target building 60. The data recording device 20 is provided with an antenna 24 so that communication with the data processing device 30 in the monitoring center 80 is possible. An antenna 34 is also attached to the data processing device 30 arranged in the monitoring center 80. The data processing devices 20 and 30 use wireless communication defined by the IEEE 802.15.4 standard. In the case of this standard, the communication speed is about 250 kb / s, and a frequency band of 2.4 GHz can be used.

  The data processing device 30 provided in the monitoring center 80 includes a transmission / reception circuit 32 and a computer. The transmission / reception circuit 32 includes a reception circuit 32a and a transmission circuit 32b, and is connected to a computer via an interface. The computer includes a CPU 36 that processes data and the like from the child device 10 transmitted and received via the transmission / reception circuit 32, a memory 38 that stores data, input / output means 37 such as a mouse and keyboard, and display means 42 such as a monitor.

  A specific state of connection between the child device 10a having the strain sensor 12 or the child device 10b having the acceleration sensor 14 and the data recording device 20 provided on each floor of the building 60 will be described with reference to FIG. In order to facilitate the laying of the communication cable 52 and the power cable 54, the data recording device 20 is connected to a plurality of slave units 10 arranged on the same floor, and records data of the plurality of slave units 10. . The data recording device 20 is supplied with 100V or 200V commercial power from the power source 28.

  Data transmitted and received by the antenna 24 attached to the data recording device 20 is signal-processed by a CPU 23 connected to the receiving circuit 22a or the transmitting circuit 22b via an interface. The data sent from the slave units 10a and 10b is signal-processed by the CPU 23 and then temporarily stored in the memory 25. The data temporarily stored in the memory 25 is sent to the data processing device 30 wirelessly from the transmission circuit 22b via the antenna 24. The receiving circuit 22a receives a command from the data processing device 30 wirelessly and operates the data recording device 20 and the slave unit 10.

  The slave units 10a and 10b arranged on the same floor as the data recording device 20 constitute a data network. That is, the slave unit 10a is connected to the adjacent slave unit 10b by one communication cable 52 and one power cable 54 through which a data signal is transmitted. Similarly, the slave unit 10b is connected to the other slave unit 10a by one communication cable 52 and one power cable 54.

  In this way, the slave units 10, 10,... Are connected using a single communication cable that connects only the slave units 10, 10 adjacent to each other and a single power cable. Form. The data recording device 20 and the child device 10a adjacent to the data recording device 20 are also connected by one communication cable 52a and a power cable 54a.

  Therefore, the data recording device 20 to the terminal slave unit 10 are connected in a daisy chain with the communication cables 52 and 52a and the power cables 54 and 54a connecting the slave units 10 and 10 and between the slave unit 10 and the data recording device 20. Has been. Thus, power is supplied from the data recording device 20 to each of the slave units 10, 10,. Further, mutual communication between the data recording device 20 and each of the slave units 10, 10,... Is possible, and measurement data can be transferred from the slave unit 10 to the data recording device 20.

  In the child device 10 a having the strain gauge 12 that is a strain sensor, the strain gauge 12 is connected to the strain amplifier 13. The strain amplifier 13 has a bridge circuit that converts a resistance measurement value of the strain gauge 12 into a voltage. When measuring with the strain gauge 12, a timer 16 is used. The timer 16 is used to control the measurement start time, the measurement time length, and the measurement data transfer time. The output of the strain amplifier 13 is calculated by the CPU 17 and stored in the memory 18. The strain gauge 12 is fixed to a column, beam, floor, or the like of the building 60 that is an observation target portion using an adhesive. The strain amplifier 13, the timer 16, and an amplifier (not shown) are accommodated in one housing and fixed to a wall or the like.

  In the slave unit 10b having the acceleration sensor 14, the acceleration sensor 14 is used instead of the strain amplifier 13 and the strain gauge 12 used in the slave unit 10a. The acceleration sensor 14 is fixed to a column, beam, floor, or the like that is an observation target. Similarly to the slave unit 10a, the slave unit 10b includes a CPU 17 that calculates data measured by the acceleration sensor 14, a memory 18 that stores data calculated by the CPU, and a timer 16 that is used to control measurement start time and measurement time length. .

  The operation of the data transmission / reception system of the present embodiment configured as described above will be described with reference to the flowchart shown in FIG. 3 and the time chart shown in FIG. FIG. 3 is a flowchart showing a processing flow of the data processing device 30, the data recording device 20, and the slave device 10a. FIG. 4A is a processing flow of the data processing device 30, and FIG. 4B is a processing flow of the data recording device 20 and the slave device 10a.

  The data processing device 30, the data recording device 20, and the child device 10 are activated for data measurement (steps 300 and 320). Then, the data processing device 30 transmits a power ON command 362 to the child device 10 (step 302). Upon receiving the power ON command 362 from the data processing device 30 (step 322), the data recording device 20 supplies power to the slave unit 10, and the power of each measuring device included in the slave unit 10 is turned ON (step 324). . When the power of the slave unit 10a is turned on, the power of the strain amplifier 13 is also turned on, and warming up and calibration are executed (step 326).

  At this time, in order to synchronize the time of the timer 16 included in each slave unit 10 and the time of the computer of the data processing device 30 in the following measurement, the data processing device 30 sends a timer time correction instruction 364 to the data recording device 20. Is transmitted to the slave unit 10 via the terminal (step 304). Receiving the timer time correction command 364, each slave unit 10 corrects the time of the timer 16 that it has (step 330). Thereby, the time when each child device 10 measured data can be determined.

  Next, a sample command signal 366 for data measurement is transmitted from the data processing device 30 to each child device 10 via the data recording device 20. Each slave unit 10 measures the time required from the time when the sample command signal 366 for data measurement is transmitted until the measurement is started (step 332). Each slave unit 10 starts data measurement based on the sample command signal 366 and transmits the sample measurement data signal 368 to the loopback data processing device 30. The data processing device 30 measures the time from when the sample command signal 366 is transmitted to the child device 10 until the sample measurement data 368 returns (step 306). The processes in steps 306 and 332 are executed for each slave unit 10. Thereby, the some subunit | mobile_unit 10,10, ... can be measured synchronizing.

  In step 332, since the time until the data measurement specific to each slave unit 10 is found from the difference between the command time of the sample command signal 366 in each slave unit 10 and the time when the data measurement is started, for each slave unit 10 In addition, a process for synchronizing the start timing of data measurement and a process for avoiding collision and congestion in the traffic for sending the measured data to the data processing device 30 are executed. That is, the data measurement start time and the data transmission time are calculated for each slave unit 10 (step 308). This calculation will be described later with reference to the time chart of FIG.

  Command data 370 such as the data measurement start time of each slave unit 10 calculated in step 308, the data measurement time length, and the time at which each slave unit 10 transmits the measurement data to the data processing device 30 is stored in the data processing device 30. Is transmitted to each slave unit 10 via the data recording device 20 (step 310). Each slave unit 10 receives the command data 370 from the data processing device 30 (step 334). The command data 370 is stored in the memory 18.

  The CPU 17 of each slave unit 10 that has received the command data 370 determines the data measurement start time according to the command content. Then, it is determined whether or not the time indicated by the timer 16 is the data measurement start time of the command data 370 commanded from the data processing device 30 (step 336). If it is before the designated data measurement start time, the measurement is waited (step 337). If the data measurement start time has been reached, the slave unit 10a having the strain sensor 12 starts measurement using the strain sensor 12 (step 338). Although not shown, if the slave device 10 b has the acceleration sensor 14, the measurement is started using the acceleration sensor 14. At the same time, the measurement data is temporarily stored in the memory 18.

  Next, the CPU 17 of each slave unit 10 determines whether or not the data transmission time in the command data 370 transmitted from the data processing device 30 has been reached (step 340). If it is before the designated data transmission time, data transmission is waited (step 341). If the designated data transmission time has been reached, the measurement data 372 is transmitted to the data recording device 20. The data recording device 20 temporarily stores the transmitted measurement data 372 in the memory 25. At the same time, the measurement data 372 is transmitted to the data processing device 30.

  The data processing device 30 receives the transmitted measurement data of strain and acceleration (step 312), and processes the measurement data so that it can be displayed on the display means 42 included in the data processing device 30 (step 314). The measurement data subjected to the data processing is displayed on the display means 42 (step 316) and provided to the data monitor.

The above is the outline of the data transmission / reception system 100. Data measurement using the slave unit 10 in steps 308 to 316 and steps 334 to 342 is continued almost without interruption. However, in order to accurately grasp the time until data measurement unique to each slave unit 10, steps 306, 332, etc. are executed periodically or by an interrupt operation. Steps 304, 328, and 330 for synchronizing the timer 16 and the computer time are also periodically executed. FIG. 4 shows a time chart of data transmission between the data recording device 20 and each slave unit 10. The horizontal axis indicates time. In the case of this embodiment, the data recording device 20 is connected with three slave units 10 in series, and dedicated channels ch1 to ch3 are assigned to the slave units 1 to 3, respectively. In order to make the time chart easy to understand, the measurement command is 1 ms or less, the time required for measurement is 5 ms, and the time required for data transmission from each channel is 2 ms or less. In FIG. 4, the signal content on the signal line 52 with the data recording device 20 is from the top to the third, and the bottom nine are the reception signal, measurement timing, and transmission signal in the slave units 1 to 3 in three stages. Is shown.

  First, the data recording device 30 instructs the slave units 1 to 3 to perform measurement. The measurement command signal is transmitted from the line 52 at intervals of 10 ms. Each slave unit 1 to 3 confirms that the transmitted signal is a signal to itself and measures it. That is, the subunit | mobile_unit 1 confirms that the command signal sent initially is a signal to self, and reads command content. In this example, the command signal to the handset 1 is “Start measurement after 30 ms”. Similarly, the subunit | mobile_unit 2 confirms that the 2nd command signal is a command signal to self, and the command content is "Start measurement after 20 ms elapses." The subunit | mobile_unit 3 confirms that the 1st and 2nd signal is not to self, and the 3rd is a command signal to self, and the content is "Start measurement after 10 ms elapses." These command signals are temporarily stored in the memories of the slave units 1 to 3.

  Each subunit | mobile_unit 1-3 will start a measurement, if the time instruct | indicated from the data recording device 20 reaches | attains based on the time information of the timer 16 which each has. The measured data is temporarily stored in the memory 18 included in each of the slave units 1 to 3. Since the measurement is completed, each of the slave units 1 to 3 transmits measurement data to the data recording device 20 using the line 52. In transmission, if the command signal from the data recording device 20 is transmitted in the idle time, the data transmission and the command signal do not collide.

  Then, the subunit | mobile_unit 1 transmits measurement data by making the start time into immediately after the command signal was sent to the line 52. FIG. Since the measurement data of the slave unit 1 has already been output and the communication line 52 is occupied for that time, the slave unit 2 has its own measurement data immediately after transmission of the measurement data of the slave unit 1 that is the idle time of the communication line 52. Send. Similarly, the subunit | mobile_unit 3 transmits self measurement data in the idle time of the communication time after the transmission measurement data of the subunit | mobile_unit 1 and the subunit | mobile_unit 2 are transmitted.

  When an abnormal situation occurs, an alarm is issued. The data recording device 30 issues an alarm signal when the power 28, the communication line 52, the power line 54, and the like are generated. At that time, the alarm signal 410 is transmitted from the line 52 during the idle time between the data recording command and the measurement data transmission so that the alarm signal is reliably transmitted to each of the slave units 1 to 3.

  According to the present embodiment, even if the command time of the measurement command is not broadcast, it is possible to reliably measure at the same time by each slave unit. In this embodiment, a command signal is sent from the data recording device to each slave unit for each measurement. Needless to say, a plurality of measurement instructions may be issued with a single command signal. However, even in that case, in order to prevent collision of measurement data transmission, each slave unit needs to adjust the transmission timing. For example, the slave unit 1, the slave unit 2, and the slave unit 3 are given priority. It is necessary to do so. Further, the number of slave units is not limited to 3, but may be 1 or 2 or 4 or more.

  According to the present embodiment, since the power of each slave unit is obtained from an adjacent slave unit or data recording device, wiring is easier than when power is obtained from a single power source. In addition, since the command signal and the measurement data signal are also transmitted and received through the signal lines of the adjacent slave units, a long wiring is not necessary and the wiring is facilitated. Further, when the slave units are added, the signal lines and the power supply lines need only be wired from the adjacent slave units, which facilitates the wiring confirmation and can greatly reduce the time required for wiring. In particular, even when there is a restriction on complicated floor arrangement and wiring routing, it is only necessary to perform wiring between adjacent slave units, and signal interference can be prevented. If the same connector can be connected between the power supply line and the signal line when connecting to the adjacent slave unit or the like, wiring is further facilitated.

  In the above embodiment, IEEE 802.15.4 is used as wireless communication. However, in addition to IEEE802.5.4, mobile communication, wireless LAN such as IEEE802.11b, 11a, 11g, and 11n, IEEE802. 16 fixed wireless access, WAN (Wide Area Network), MAN (Metropolitan Area Network), Bluetooth such as IEEE 802.15, short-range wireless, small power wireless, ultra-wide band wireless (UWB), other weak wireless, semi-radio A millimeter wave, millimeter wave, optical LAN, or the like can also be used. The communication means may be any communication means that can perform wireless transmission and can also use a relay station or the like.

The schematic diagram of one Example of the data transmission / reception system which concerns on this invention. The block diagram of the data transmission / reception system shown in FIG. The flowchart which shows data recording. The time chart explaining transmission / reception between a data recording device and a subunit | mobile_unit.

Explanation of symbols

10, 10a, 10b Child machine 12 Strain gauge 13 Strain amplifier 16 Timer 17 CPU
18, 25, 39 Memory 20 Data recording device 22 Transmission / reception circuit 23, 38 CPU
24, 34 Antenna 28 Power supply 30 Data processor 32 Transmission / reception circuit 36 Computer 37 Input means 42 Display means 52 Signal line 54 Power line 100 Data transmission / reception system 410 Alarm signal

Claims (6)

In a data transmission / reception system that acquires data at a remote location and wirelessly transmits the acquired data to a data processing device provided at the data processing location, the data recording device and the data recording device connected to the data recording device are connected to the remote location for measurement. A plurality of slave units provided with sensors, a power line for supplying power to the slave units adjacent to the data recording device, and a signal line for transmitting and receiving signals, and between the adjacent slave units for the plurality of slave units A power line and a signal line for connecting only the power line and the signal line from the data recording device to the slave unit at the end are connected in parallel, and the data processing device transmits time information to each slave unit. The time of the timer of each slave unit is synchronized, and the sample measurement command signal is transmitted to each slave unit. Measure the time from the start of the measurement until the measurement result of each slave unit returns, and based on this measurement result, set the data measurement start command time to each slave unit so that the sensor of each slave unit can start synchronous measurement. A data transmission / reception system characterized by setting . 2. The data transmission / reception system according to claim 1, wherein the data processing location and the remote location are transmitted / received via a plurality of relay stations, and a network conforming to the IEEE 802.15.4 specification is used for the transmission / reception.   The data transmission / reception system according to claim 1, wherein a network of IEEE802.15.4 specification is used for transmission / reception between the data processing place and a remote place. The slave unit includes at least one of a strain sensor and an acceleration sensor that can detect a physical change of a measurement target, a CPU that controls transmission and reception of signals detected by the sensor, and measurement of a plurality of slave units And a memory for storing a measurement result, and the data recording device includes measurement data transmitted from each slave unit, a memory for storing the measurement data, and the measurement data. 4. A CPU for controlling transmission / reception of data, a power supply for supplying power to a plurality of slave units in parallel , a data processing location, and an antenna for enabling wireless transmission / reception. The data transmission / reception system described. 5. The data transmission / reception system according to claim 4, wherein the data recording device transmits a measurement command from a signal line attached to the data recording device at a different timing to each slave unit. The data recording device is characterized by instructing the slave unit a measurement start time after the measurement command reception has elapsed, and changing the measurement start time in each slave unit so that each slave unit can start measurement simultaneously. The data transmission / reception system according to claim 5.

Images