JP2021040194A - Data logger terminal, communication system, and communication method - Google Patents

Abstract

To provide a data logger terminal, a communication system, and a communication method that can reduce a data communication time at a low power consumption when compared to a conventional one.SOLUTION: A data logger terminal 100 includes: sensors 108-110; a processor 101 that extracts some data or creates new data from data measured by the sensors according to a predetermined number of pieces of data and a recording condition; a memory 103 that has a second recording area 132 where the extracted or created data is recorded; and a wireless communication unit 106 that transmits the data recorded in the second recording area to a tablet terminal 200 by a first wireless communication method with lower power consumption than a second wireless communication method.SELECTED DRAWING: Figure 1

Description

The present invention relates to data logger terminals, communication systems and communication methods.

Data logger terminals are used for equipment management in factories, impact detection during luggage transportation, and acquisition of environmental data outdoors. For example, when transporting a package, a data logger attached to the package records the temperature and acceleration at regular intervals. The data recorded in the data logger terminal is transmitted to the server via the smartphone or tablet terminal, the data is accumulated and analyzed, and the result is notified to the user.

There is known a sensor terminal capable of preferentially transmitting important information to a server without having to calculate complicated parameters (see, for example, Patent Document 1). Further, a management device capable of reading stored measurement data at high speed is known (see, for example, Patent Document 2).

JP-A-2007-193511 Japanese Unexamined Patent Publication No. 2012-127741

When the data logger terminal is attached to the luggage, the data logger terminal may be placed out of the reach of the user, for example, the luggage may be piled up high. In this case, since the battery of the data logger terminal cannot be easily replaced, the data logger terminal is required to operate with low power consumption.

When transmitting the data recorded in the data logger terminal to the tablet terminal, low-speed wireless communication is used to operate the data logger terminal with low power consumption, but the data recorded in the data logger terminal is used in the tablet. There is a problem that it takes a long time to send to the terminal. On the other hand, if the data logger terminal performs high-speed wireless communication used in a computer network or the like, the power consumption becomes high, and there is a problem that the battery of the data logger terminal runs out in a short period of time.

An object of the present invention is to provide a data logger terminal, a communication system, and a communication method capable of shortening a data communication time as compared with the conventional one with low power consumption.

In order to achieve the above object, the data logger terminal disclosed in the specification extracts a part of data from the data measured by the sensor or new data according to the sensor and a predetermined number of data and recording conditions. A second wireless communication system used between a data processing unit that creates data, a recording unit that has a recording area for recording data extracted or created by the data processing unit, and a wireless communication terminal and an information processing device. It is a first wireless communication method having a lower power consumption, and is characterized by including a wireless communication unit that transmits data recorded in the recording area to the wireless communication terminal.

In order to achieve the above object, the communication system disclosed in the specification is a communication system including a data logger terminal and a wireless communication terminal, and the data logger terminal includes a sensor and a predetermined number of data and records. A recording unit having a data processing unit that extracts a part of data from the data measured by the sensor or creates new data according to conditions, and a recording area that records the data extracted or created by the data processing unit. And, the data recorded in the recording area is transmitted to the wireless communication terminal by the first wireless communication system having lower power consumption than the second wireless communication system used between the wireless communication terminal and the information processing device. The wireless communication terminal has a first wireless communication unit, and the wireless communication terminal performs wireless communication with the first wireless communication unit by the setting unit for setting the number of data and the recording conditions, and the first wireless communication method. It is characterized by having two wireless communication units and a first display unit that displays data acquired from the data logger terminal via the second wireless communication unit.

In order to achieve the above object, the communication method of the communication system disclosed in the specification is a communication method of a communication system including a data logger terminal and a wireless communication terminal, and the wireless communication terminal is a data number and recording conditions. The data logger terminal transmits the setting information of the above to the data logger terminal, and the data logger terminal extracts a part of data from a plurality of data measured by the sensor or creates new data according to the setting information received from the wireless communication terminal. Then, a plurality of data measured by the sensor are recorded in the first recording area of the recording medium, the extracted or created data is recorded in the second recording area of the recording medium, and the wireless communication terminal and information are recorded. It is a first wireless communication method that consumes less power than the second wireless communication method used with a processing device, and is characterized by transmitting only the data recorded in the second recording area to the wireless communication terminal. To do.

According to the present invention, the data communication time can be shortened as compared with the conventional case with low power consumption.

It is a block diagram of the communication system provided with the data logger terminal. It is a figure which shows the data and the size which can be recorded in a raw data recording area. It is a timing chart which shows the processing executed in the communication system. (A) is a diagram showing the structure of the data recorded in the first example of the data recording process, and (B) is a diagram showing an example of the data recorded in the first example. It is a flowchart which shows the 1st example of a data recording process. It is a figure which shows the structure of the data recorded in the 2nd example of a data recording process. It is a flowchart which shows the 2nd example of the data recording process. (A) is a diagram showing the structure of data recorded in the third example of the data recording process, and (B) is a diagram showing a data logger terminal attached to the object. It is a flowchart which shows the 3rd example of the data recording process. It is a figure which shows the structure of the data recorded in the 4th example of a data recording process. It is a flowchart which shows the 4th example of the data recording process. It is a figure which shows the structure of the data recorded in the 5th example of a data recording process. It is a flowchart which shows the 5th example of the data recording process.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram of a communication system including a data logger terminal. The communication system 1 of FIG. 1 includes a data logger terminal (hereinafter, “data logger”) 100, a tablet terminal (hereinafter, “tablet”) 200 as a wireless communication terminal, and a server 300 as an information processing device. In FIG. 1, the number of the data logger 100, the tablet 200, and the server 300 is one, but there may be more than one.

The data logger 100 includes a processor 101 as a data processing unit that controls the operation of the data logger 100, a RAM 102 that temporarily stores various data, a memory 103 such as an EEPROM as a recording unit that stores measured values of the sensor, and data. A display device 104 such as an LED indicating the operating state of the logger 100, a time acquisition unit 105 for acquiring the time, a communication unit 106 for wireless communication with the tablet 200, an antenna 107 connected to the communication unit 106, and a data logger. It has an acceleration sensor 108 that measures the acceleration of 100 X-axis, Y-axis, and Z-axis, a temperature sensor 109 that measures the ambient temperature, a pressure sensor 110 that measures atmospheric pressure, and a replaceable battery. It is provided with a power supply unit 111. Each sensor makes measurements at regular intervals. The processor 101 is connected to the RAM 102, the memory 103, the display device 104, the time acquisition unit 105, the communication unit 106, the acceleration sensor 108, the temperature sensor 109, and the barometric pressure sensor 110 via the bus 112. The power supply unit 111 supplies electric power to the processor 101, RAM 102, memory 103, display device 104, time acquisition unit 105, communication unit 106, acceleration sensor 108, temperature sensor 109, and pressure sensor 110.

The processor 101 performs calculations using the measured values of the respective sensors, and creates data to be recorded in the summary data recording area described later.

The memory 103 has a raw data recording area (hereinafter, “first recording area”) 131 for recording the values measured by the acceleration sensor 108, the temperature sensor 109, and the pressure sensor 110 as they are, and the data recorded in the first recording area 131. Summary data recording area (hereinafter referred to as "second recording") that records data extracted from the data in descending order or in ascending order, and data such as mean value and standard deviation obtained as a result of calculation on the data recorded in the first recording area 131. Region ") 132 and.

The display device 104 indicates the operating state of the data logger 100, such as sensing, data writing, energy saving mode, and normal mode, in color. For example, it is red during sensing, green during data writing, yellow in energy saving mode, and white in normal mode.

The time acquisition unit 105 includes a GPS receiver, a real-time clock (RTC), a crystal oscillator, software, and the like. When the time acquisition unit 105 is a GPS receiver, time information is acquired from the received radio waves. When the time acquisition unit 105 is an RTC or a crystal oscillator, the elapsed time is counted by a clock. The time acquisition unit 105 holds the recording start time and calculates the time from the count interval and the number of counts. When the time acquisition unit 105 is software, the time information is acquired from the tablet 200 via the communication unit 106.

The communication unit 106 is a Bluetooth (registered trademark) (including Bluetooth Low Energy) or a specified low power wireless (IEEE802.15.4 compliant), and communicates with the tablet 200, for example, a low-speed wireless communication unit having a transmission speed of 1 Mbps or less. is there. The communication unit 106 transmits only the data read from the second recording area 132 to the tablet 200.

The processor 101 can detect the inclination of the data logger 100 by detecting the gravitational acceleration of the X-axis, the Y-axis, and the Z-axis with the acceleration sensor 108.

When the operation mode of the data logger 100 is the energy saving mode, the power supply unit 111 applies power only to a portion that receives data from each sensor that is a part of the acceleration sensor 108, the temperature sensor 109, the pressure sensor 110, and the processor 101. Supply. In this case, since power is not consumed for wireless communication and data writing / reading, it is possible to suppress battery exhaustion.

When the processor 101 receives data from the acceleration sensor 108, the temperature sensor 109, and the pressure sensor 110, an interrupt is applied and the operation mode of the data logger 100 is switched to the normal mode. When the data logger 100 is in the normal mode, the power supply unit 111 supplies power to the processor 101, RAM 102, memory 103, display device 104, time acquisition unit 105, communication unit 106, acceleration sensor 108, temperature sensor 109, and pressure sensor 110. To do.

The tablet 200 includes a processor 201 that controls the operation of the tablet 200, a memory 202 that stores programs, applications, data, and the like, a display device 203 that displays data, and a first communication unit 204 that wirelessly communicates with the data logger 100. The antenna 205 connected to the first communication unit 204, the second communication unit 206 that wirelessly communicates with the server 300, and the power supply unit 207 having a battery are provided. The power supply unit 207 supplies electric power to the processor 201, the memory 202, the display device 203, the first communication unit 204, and the second communication unit 206. The processor 201 is connected to the memory 202, the display device 203, the first communication unit 204, and the second communication unit 206 via the bus 208. The processor 201 functions as a setting unit.

The first communication unit 204 is, for example, Bluetooth (registered trademark) or a specified low power radio, and is a low-speed wireless communication unit for communicating with the data logger 100.

The second communication unit 206 is, for example, a wireless LAN (Local Area Network), and is a high-speed wireless communication unit for communicating with the server 300, for example, having a transmission speed of 10 Mbps or more. The second communication unit 206 has a higher transmission speed and higher power consumption than the first communication unit 204.

The processor 201 reads out the data measured by the acceleration sensor 108, the temperature sensor 109, and the barometric pressure sensor 110 and recorded in the second recording area 132. The memory 202 stores the data read from the second recording area 132. The display device 203 can display the data read from the second recording area 132 and notify the user.

Further, the processor 201 sets the data logger 100 based on the input of the setting application of the data logger 100 stored in the memory 202. For example, the number of data to be read from the data logger 100, the recording conditions for recording the data in the second recording area 132, and the like are set.

The processor 201 transmits the data read from the second recording area 132 to the server 300 via the second communication unit 206, and aggregates the data in the server 300.

The server 300 includes a processor 301 that controls the operation of the server 300, a memory 302 that stores programs, applications, data, and the like, a display device 303 that displays data, a communication unit 304 that wirelessly communicates with the tablet 200, and a power supply. It has a part 305. The power supply unit 305 supplies power to the processor 301, the memory 302, the display device 303, and the communication unit 304. The processor 301 is connected to the memory 302, the display device 303, and the communication unit 304 via the bus 306.

The communication unit 304 is, for example, a wireless LAN and is a high-speed communication unit that communicates with the tablet 200. The processor 301 receives the data read from the second recording area 132 from the tablet 200 via the first communication unit 204. The processor 301 aggregates and analyzes data from a plurality of tablets 200, displays the analysis result on the display device 303, and notifies the user.

FIG. 2 is a diagram showing the types and sizes of data that can be recorded in the first recording area 131. The temperature is measured by the temperature sensor 109, the pressure pressure is measured by the pressure sensor 110, and the acceleration and impact are measured by the acceleration sensor 108.

The impact indicates the maximum value of the acceleration (norm) applied to the data logger 100 and the number of times the acceleration exceeds the threshold value. The acceleration is used when detecting the inclination of the data logger 100. The values measured by the acceleration sensor 108, the temperature sensor 109, and the barometric pressure sensor 110 are temporarily stored in the RAM 102, and are stored in the memory 103 when the time reaches the recording interval.

In the data logger 100, not only the data measured by each sensor is recorded in the first recording area 131 of the memory 103, but also the data created based on the data measured by each sensor is recorded in the second recording area 132. Will be done.

The details of the data created based on the data measured by each sensor will be described later, but for example, a predetermined number of data extracted from the data recorded in the first recording area 131 in descending order or the first It is data such as an average value and a standard deviation obtained based on the data recorded in the recording area 131.

Only the data read from the second recording area 132 is transmitted to the tablet 200.

FIG. 3 is a timing chart showing the processing executed by the communication system 1. First, the data logger 100 starts communication with the tablet 200 (S1). The tablet 200 sets the number of data to be read from the data logger 100 and the recording conditions for recording the data in the second recording area 132, and transmits the setting information to the data logger 100 (S11). The recording conditions include an initial value of each sensor, a threshold value for determining whether or not to record data of each sensor, and the like. When the data logger 100 acquires the time from the tablet 200, the tablet 200 also transmits the time to the data logger 100 in S11.

The data logger 100 sets the setting information received from the tablet 200 to itself (S2). Further, the data logger 100 sets the time to itself as needed (S2). When the time is acquired from the tablet 200, the acquired time is set in the data logger 100. When the time acquisition unit 105 is an RTC or a crystal oscillator, the current time is calculated by adding the result of multiplying the index incremented for each data recording interval and the data recording interval to the time from the tablet 200. When the data is recorded, the current time may be recorded in the first recording area 131 and the second recording area 132 together with the data.

Next, the data logger 100 erases all the data in the first recording area 131 and the second recording area 132 (S3). The data logger 100 disconnects from the tablet 200 and restarts in the energy saving mode (S4). The data logger 100 records the data measured by each sensor in the memory 103 (S5). The details of the data recording process of S5 will be described later.

Next, the data logger 100 resumes communication with the tablet 200, reads out the data in the second recording area 132, and transmits the data to the tablet 200 (S6). After that, the procedure returns to S4.

The tablet 200 receives the data from the data logger 100 (S12), displays the data on the display device 203, and notifies the user (S13). In S13, the result of analysis of the received data by the processor 201 may be displayed on the display device 203. Further, the tablet 200 transmits data to the server 300 (S14).

When the server 300 receives the data from the tablet 200 (S15), the server 300 displays the data on the display device 303 and notifies the user (S16). In S16, the result of analysis of the received data by the processor 301 may be displayed on the display device 303.

FIG. 4A is a diagram showing a structure of data recorded in the first example of the data recording process of S5. FIG. 4B is a diagram showing an example of data recorded in the first example of the data recording process.

In the first example, a part of the measurement data is recorded in the second recording area 132 as useful data. As shown in FIG. 4A, the measurement data measured by the acceleration sensor 108, the temperature sensor 109, or the pressure sensor 110 and the time of data measurement are recorded in the first recording area 131.

In the second recording area 132, among the measurement data recorded in the first recording area 131, a predetermined number (for example, 50) of measurement data are recorded in a list structure in descending order of value. The data order, list structure, and number of measurement data are set in advance in S2.

In the second recording area 132, the specific measurement data is associated with the index of the measurement data, the address of the data of the previous size, the address of the data of the next size, and the measurement time of the data. It has been recorded. The index is incremented at each data recording interval (eg, 1 second) and associated with the measured data at each data measurement. In FIG. 4A, the measurement data is recorded in the second storage area 132 in the order of the index, the measurement data of the index 001 is arranged in the first stage, the measurement data of the index 002 is arranged in the second stage, and the measurement data of the index 002 is arranged in the third stage. The measurement data of the index 003 is arranged in. It is sufficient that at least one of the index and the time is recorded.

For example, as shown in FIG. 4B, it is assumed that three measurement data are recorded in descending order of value, and the measurement data values are larger in the order of index 002> 003> 001. Since the value of the measurement data of the index 001 is the smallest, the reservation indicating that the data of the previous size does not exist in the "address of the data of the previous size (previous pointer)" column in the first row A value, that is, a reserved value indicating that it is the first data is input, and the next largest index after the measurement data of index 001 is entered in the "address of data of the next size (rear pointer)" field in the first row. The address of the measurement data of 003 is input.

Since the value of the measurement data of the index 002 is the largest, the address of the measurement data of the index 003 is entered in the "address of the data of the previous size" field in the second row, and "one" in the second row. In the "Address of data of later size" field, a reserved value indicating that the data of the next size does not exist, that is, a reserved value indicating that the data is the last data is input.

Since the value of the measurement data of the index 003 is an intermediate value, the address of the measurement data of the index 001 is entered in the "Address of the data of the previous size" column in the third row, and "One" in the third row. The address of the measurement data of the index 002 is entered in the "Address of data of later size" field.

When the measurement data increases, the measurement data is added sequentially below the third stage, and based on the comparison between the measurement data, the "address of the data of the previous size" column and "the next one" The address in the "Size data address" column is changed as appropriate. Therefore, the data is not rearranged in the second recording area 132, and the order of the size of the measurement data is the column of "address of the data of the previous size" and "data of the next size". It can be judged from the "Address" column. For example, when the index of the increasing data is 004 and the magnitude relation of the measured data is 002> 004> 003> 001, the address of the data having the size immediately before the index 002 is rewritten to 004 and one of the indexes 003. The address of the data of the back size is rewritten to 004. The data is not sorted, but the address is updated as the data grows.

FIG. 5 is a flowchart showing a first example of the data recording process. The processor 101 shifts the operation mode of the data logger to the normal mode (S18), and determines whether or not there is a free area in the second recording area 132 (S19). If there is no free area in the second recording area 132 (NO in S19), this process ends. When there is a free area in the second recording area 132 (YES in S19), the processor 101 shifts the operation mode to the energy saving mode (S20), and appropriately acquires measurement data from each sensor (S21). After that, the processor 101 shifts the operation mode to the normal mode (S22), records the acquired measurement data in the first recording area 131 (S23), and determines whether or not the measurement data exists in the second recording area 132. Determine (S24). If the measurement data does not exist in the second recording area 132 (NO in S24), the processor 101 records the acquired measurement data as the initial data in the second recording area 132 (S27), and returns to S19.

When the measurement data exists in the second recording area 132 (YES in S24), the processor 101 compares the acquired measurement data with the measurement data recorded in the second recording area 132 (S25), and the magnitude of the value is large or small. The measurement data acquired in order are recorded in the second recording area 132 in a list structure (S26), and the process returns to S19.

FIG. 6 is a diagram showing a structure of data recorded in the second example of the data recording process of S5. In the second example, the mean value and standard deviation of the measurement data are recorded in the second recording area 132.

As shown in FIG. 6, the measurement data and the measurement time of the acceleration sensor 108, the temperature sensor 109 or the barometric pressure sensor 110 are recorded in the first recording area 131. In the second recording area 132, the average value and standard deviation of the measurement data recorded in the first recording area 131 are recorded.

In the second recording area 132, the index, the average value, the standard deviation, and the time are recorded in association with each other. For example, the index of the measurement data acquired first is input to the index. At least one of the index and the time may be recorded.

The index of the data used for calculating the average value and the standard deviation of the measured data and the number of measured data can be set in advance in S2 of FIG. For example, when the data recording interval is 1 second and the mean value and standard deviation are calculated every 1000 pieces from the measurement data 15 minutes after the start of recording, "900" is used as the index for starting calculation and "900" is used as the number of measured data. "1000" is set.

If the index to start the calculation and the number of measurement data are not set, for example, the processor 101 records the mean value and standard deviation calculated for each block (for example, 100) from the first acquired measurement data in the second record. Record in area 132.

FIG. 7 is a flowchart of a second example of the data recording process. Since the steps of S18 to S23 are the same as the steps of S18 to S23 of FIG. 5, the description thereof will be omitted.

After S23, the processor 101 determines whether or not the number of measurement data to be calculated is specified (S30). When the number of measurement data is specified (YES in S30), the processor 101 determines whether or not the specified number of measurement data has been acquired (S31). If the specified number of measurement data has been acquired (YES in S31), the processor 101 calculates the mean value and the standard deviation, records them in the second recording area 132 (S33), and returns to S19. If the acquired measurement data does not reach the specified number (NO in S31), the process returns to S21.

When the number of measurement data to be calculated is not specified (NO in S30), the processor 101 determines whether or not the acquired measurement data has reached one block (S32). When the number of acquired measurement data reaches one block (YES in S32), the process proceeds to S33. On the other hand, if the measurement data does not reach one block (NO in S32), the process returns to S21.

FIG. 8A is a diagram showing a structure of data recorded in the third example of the data recording process of S5. FIG. 8B is a diagram showing an example of a data logger 100 attached to an object such as a luggage.

The acceleration sensor 108 detects the acceleration of the XYZ axes. When a change in acceleration equal to or greater than the threshold value with respect to the gravitational acceleration is detected, the processor 101 can determine that the load has fallen or rolled over. The threshold value is, for example, 0.9 G. In the third example, the acceleration measured by the acceleration sensor 108 when a change in acceleration equal to or greater than the threshold value is detected is recorded in the second recording area 132.

As shown in FIG. 8A, the acceleration of the XYZ axes measured by the acceleration sensor 108 and the measurement time of the acceleration are recorded in the first recording area 131. In the second recording area 132, the index of the measurement data when the acceleration change of the threshold value or more is detected, the acceleration of the XYZ axes, and the time are recorded in association with each other. It is sufficient that at least one of the index and the time is recorded.

As shown in FIG. 8B, when the acceleration of the XYZ axes when the data logger 100 is attached to the luggage is 0.009 G [x], 0.065 G [y], and 1.083 G [z], respectively. It can be seen that the surface of the + Z axis faces upward.

On the other hand, when the load rolls over 90 ° with respect to the + Y axis and the accelerations of the XYZ axes are -0.967G [x], 0.021G [y], and 0.087G [z], respectively, the -X axis You can see that the face is facing up.

If the load rolls over 90 ° with respect to the + Y axis and the accelerations on the XYZ axes are 0.049G [x], 0.058G [y], and -0.955G [z], respectively, the surface of the -Z axis. Turns up, and it can be seen that the luggage has rolled over 180 ° from the initial state.

In this way, by recording the acceleration and index / time of the XYZ axes when a change in acceleration exceeding the threshold value is detected in the second recording area 132, it is possible to determine at what time the luggage has fallen or rolled over. it can. Further, by setting the initial value of the acceleration of the XYZ axis of the acceleration sensor 108 in the memory 103 in advance, the inclination of the data logger 100 can be detected.

FIG. 9 is a flowchart showing a third example of the data recording process. Since the steps of S18 to S23 are the same as the steps of S18 to S23 of FIG. 5, the description thereof will be omitted.

After S23, the processor 101 determines whether or not a change in acceleration equal to or greater than the threshold value is detected based on the acceleration of the XYZ axes measured by the acceleration sensor 108 (S35). Here, it is determined whether or not the luggage has rolled over.

If no acceleration change exceeding the threshold value is detected (NO in S35), the process returns to S21. When a change in acceleration equal to or higher than the threshold value is detected (YES in S35), the processor 101 records the acceleration and index / time of the XYZ axes when the change in acceleration equal to or higher than the threshold value is detected in the second recording area 132. (S36) and return to S19.

FIG. 10 is a diagram showing a structure of data recorded in the fourth example of the data recording process of S5. In the fourth example, the air pressure applied to the data logger 100 attached to the luggage and the ambient temperature of the data logger 100 are recorded in the second recording area 132. Thereby, for example, the temperature control of the baggage and the movement control of the baggage can be performed.

As shown in FIG. 10, the measurement data and time measured by the temperature sensor 109 or the barometric pressure sensor 110 are recorded in the first recording area 131.

In the second recording area 132, the temperature at the start of measurement, the temperature when the threshold value is exceeded or falls below the threshold value, the index, and the time are recorded. Further, when the amount of change between the immediately measured atmospheric pressure and the current atmospheric pressure exceeds the threshold value, a movement flag “0x01” indicating that the load has moved is recorded in the second recording area 132. When the amount of change between the immediately preceding atmospheric pressure and the current atmospheric pressure does not exceed the threshold value, the immobility flag "0x00" indicating that the load is not moving is recorded in the second recording area 132. The temperature, the moving flag / immobility flag, the index, and the time are stored in association with each other, and at least one of the index and the time may be recorded. The timing of recording in the second recording area 132 is, for example, when the temperature exceeds or falls below the threshold value. By doing so, only useful data can be recorded in the second recording area 132.

In the example of temperature control of luggage in the freezer, the temperature threshold is set to 0 ° C., the temperature at the time when the temperature exceeds 0 ° C. and its index are recorded in the second recording area 132, and then the temperature is 0 ° C. The temperature and index when the temperature is lower than that are recorded in the second recording area 132. By doing so, it is possible to determine the time when the temperature around the luggage exceeds 0 ° C., so that the data logger 100 can be used for quality control and the like. In the above case, the data logger 100 at room temperature may pass the threshold value when it drops to the room temperature in the freezer at the start of recording, but the data is ignored.

Further, when the amount of change in the ambient air pressure when the temperature exceeds 0 ° C. exceeds the threshold value, the movement flag "0x01" and the index or time are recorded in the second recording area 132, so that the luggage is stored in the freezer at what timing. You can determine if you have moved outside. Further, since the movement flag / immobility flag and the index or time are recorded in the second recording area 132, it is possible to determine when the luggage was moved into the freezer and the period during which the luggage is stored in the freezer.

Since the atmospheric pressure may change only for a short time due to the influence of air conditioning or the like, if the movement flag "0x01" is not recorded in the second recording area 132 for a certain period of time or more, the tablet 200 or the server 300 will move the luggage. You may judge that it is not.

FIG. 11 is a flowchart showing a fourth example of the data recording process. Since the steps of S18 to S23 are the same as the steps of S18 to S23 of FIG. 5, the description thereof will be omitted.

After S23, the processor 101 determines whether or not the temperature measured by the temperature sensor 109 exceeds the threshold value (S40). In S40, it may be determined whether or not the temperature has fallen below the threshold value.

If the temperature does not exceed the threshold value (NO in S40), the process returns to S21. When the temperature exceeds the threshold value (YES in S40), the processor 101 determines whether or not the amount of change in atmospheric pressure exceeds the threshold value (S41). When the atmospheric pressure changes beyond the threshold value (YES in S41), the processor 101 determines that the load is moving, sets the movement flag "0x01" (S42), and sets the temperature and the movement flag and the index or The time and time are recorded in the second recording area 132 (S43), and the process returns to S19.

If the amount of change in atmospheric pressure does not exceed the threshold value (NO in S41), the processor 101 determines that the load has not moved, sets the immobility flag "0x00" (S44), and sets the temperature, immobility flag, and index. Alternatively, the time and time are recorded in the second recording area 132 (S43), and the process returns to S19.

FIG. 12 is a diagram showing a structure of data recorded in the fifth example of the data recording process of S5. In the fifth example, the impact data measured by the acceleration sensor 108 is recorded in the second recording area 132. The impact data indicates the maximum value of the acceleration applied to the data logger 100 during the recording interval (eg, 1 second) and the number of times the acceleration exceeds the threshold during that time.

As shown in FIG. 12, the acceleration and time measured by the acceleration sensor 108 are recorded in the first recording area 131.

In the second recording area 132, the index, the maximum value of the acceleration during the recording interval, the number of times the acceleration exceeds the threshold value during that period, and the time are recorded. The index, the maximum value of acceleration, the number of times the threshold is exceeded, and the time are stored in association with each other. At least one of the index and the time needs to be recorded. The timing of recording in the second recording area 132 is, for example, when the acceleration exceeds the threshold value. That is, data is written to the second recording area 132 only when an impact equal to or greater than the threshold value is applied to the data logger 100.

FIG. 13 is a flowchart showing a fifth example of the data recording process. Since the steps of S18 to S23 are the same as the steps of S18 to S23 of FIG. 5, the description thereof will be omitted.

After S23, the processor 101 determines whether or not the acceleration measured by the acceleration sensor 108 exceeds the threshold value (S46). If the acceleration does not exceed the threshold value (NO in S46), the process returns to S21. When the acceleration exceeds the threshold value (YES in S46), the processor 101 records the maximum value of the acceleration, the number of times the threshold value is exceeded, and the index or time in the second recording area 132 (S47), and S19. Return to.

As described above, according to the present embodiment, the processor 101 shifts the data created from the data recorded in the first recording area 131 to the second recording area 132 according to the predetermined number of data and recording conditions. Only the recorded and created data is transmitted to the tablet terminal 200 by Bluetooth or a specific low power wireless, which has a lower data transmission speed and lower power consumption than the wireless LAN.

Therefore, the data communication time can be shortened as compared with the case where all the data recorded in the data logger 100 is transmitted to the tablet 200. Further, since Bluetooth or a specific low power wireless is used as a communication method with the tablet 200, power consumption can be reduced as compared with the case of using a wireless LAN.

In particular, in the data logger 100 attached to luggage or the like, there is a possibility that the battery cannot be easily replaced, and it is necessary to avoid running out of the battery. Since the data logger 100 has different uses and functions from general communication devices such as computers and tablets, it is useful to shorten the data communication time and reduce the power consumption.

Since data such as the mean value and standard deviation processed by the data logger 100 is transmitted to the tablet 200, the amount of data to be transmitted can be reduced as compared with the case where the data acquired from the sensor is transmitted to the tablet 200 as it is. And the data communication time can be shortened.

Further, since only the data recorded in the second recording area 132 can be aggregated in the tablet 200 or the server 300, the aggregated data and the analysis result of the aggregated data can be displayed and notified to the user.

The present invention is not limited to the above-described embodiment, and can be variously modified and implemented without departing from the gist thereof.

1 communication system, 100 data logger terminals,
101, 201, 301 processors, 102 RAM,
103 non-volatile memory, 104, 203, 303 display device,
105 Time acquisition unit, 106, 304 communication unit, 107 antenna,
108 accelerometer, 109 temperature sensor, 110 barometric pressure sensor,
111 power supply, 131 raw data recording area,
132 Summary data recording area, 200 tablets,
202, 302 memory, 204 1st communication unit,
206 Second Communication Department, 300 Server

Claims (5)

With the sensor
A data processing unit that extracts some data from the data measured by the sensor or creates new data according to a predetermined number of data and recording conditions.
A recording unit having a recording area for recording data extracted or created by the data processing unit, and a recording unit.
A first wireless communication method that consumes less power than the second wireless communication method used between a wireless communication terminal and an information processing device, and wireless communication that transmits data recorded in the recording area to the wireless communication terminal. Department and
A data logger terminal characterized by being equipped with. The data processing unit extracts a part of the data from the data measured by the sensor in descending order of the value, and determines the magnitude relationship between the extracted data and the data other than the extracted data. The data logger terminal according to claim 1, wherein the value of the indicated front-back pointer and at least one of the index and the time are recorded in the recording area. The data processing unit is characterized in that an average value and a standard deviation are created from a plurality of data measured by the sensor, and the average value and the standard deviation are recorded in the recording area together with at least one of an index or a time. The data logger terminal according to claim 1. A communication system including a data logger terminal and a wireless communication terminal.
The data logger terminal is
With the sensor
A data processing unit that extracts some data from the data measured by the sensor or creates new data according to a predetermined number of data and recording conditions.
A recording unit having a recording area for recording data extracted or created by the data processing unit, and a recording unit.
A first wireless communication method that consumes less power than the second wireless communication method used between the wireless communication terminal and the information processing device, and transmits data recorded in the recording area to the wireless communication terminal. It has one wireless communication unit and
The wireless communication terminal is
A setting unit that sets the number of data and the recording conditions,
The first wireless communication unit and the second wireless communication unit that performs wireless communication by the first wireless communication method,
A communication system including a first display unit that displays data acquired from the data logger terminal via the second wireless communication unit. A communication method for a communication system including a data logger terminal and a wireless communication terminal.
The wireless communication terminal transmits the setting information of the number of data and the recording condition to the data logger terminal, and then
The data logger terminal extracts a part of data from a plurality of data measured by the sensor or creates new data according to the setting information received from the wireless communication terminal.
A plurality of data measured by the sensor are recorded in the first recording area of the recording medium, and the extracted or created data is recorded in the second recording area of the recording medium.
In the first wireless communication method, which consumes less power than the second wireless communication method used between the wireless communication terminal and the information processing device, only the data recorded in the second recording area is sent to the wireless communication terminal. A communication method of a communication system characterized by transmitting.

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