JP5839552B2 - Wireless metering meter position detection method - Google Patents

Description

  The present invention relates to a technique for specifying the position of meters equipped with a wireless meter reading system, and more specifically, a signal transmitted from a meter equipped with a wireless meter reading system is received by a receiving means, and the meters using the received signal. The present invention relates to a method for specifying the position.

  The wireless meter reading system is a system developed to measure a gas meter or the like using wireless. Conventionally, for example, in a meter reading operation of a gas meter, a meter reader has to go to the place where the gas meter is installed and visually check the counter of the gas meter. However, by attaching a slave unit having a wireless communication function to the gas meter, the meter reading of the gas meter can be performed even from a position away from the gas meter using a master unit that cooperates with the information processing terminal. The meter reader can read the meter only by operating the master unit. This is effective, for example, in that it eliminates the trouble of meter reading of a gas meter installed in a building room, and can improve work efficiency.

  For example, Patent Document 1 discloses a technique related to a wireless meter reading system. GPS (Global Positioning System) is installed in the master unit, and the master unit's current location data that is constantly updated by GPS and the location data of the slave units installed in each unit registered in the master unit in advance Select the metering slaves according to the current position. And the meter-reading data transmitted from the selected subunit | mobile_unit can be received sequentially, and a meter-reading can be performed automatically. In this way, it is possible to greatly reduce the workload of the meter reader. Some techniques using the wireless meter reading system have been studied.

JP 2001-222785 A

  However, a new problem is pointed out because the wireless meter reading system has a function of meter reading even from such a remote position. As a result of using and operating a wireless meter-reading meter in the method disclosed in Patent Document 1, it is difficult to confirm the position of the main body of meters to be metered. Since the meters to be metered can be metered wirelessly, it is allowed to be placed at a position where it is difficult to visually check or a temporary storage place for luggage is installed in front of the meter meter. As a result, there are cases where a wall is provided in front of the meter-reading meter for the convenience of the user in each room.

  If only meter reading is performed, these situations will not be a problem as long as a wireless meter reading system is used. However, for example, gas meters have legal definitions that must be replaced periodically. This is because it is necessary to periodically calibrate the gas meter. Moreover, since the subunit | mobile_unit of the wireless meter-reading system attached to a gas meter also needs a battery for communication, since it is built in, it is also necessary to replace | exchange this regularly. For this reason, it is necessary to be able to confirm the installation position of the gas meter when replacing the gas meter. There are similar circumstances for other meters.

  However, on-site operation reduces the opportunity for the meter reader to visually check the gas meter itself by operating the wireless meter reading system, and as mentioned above, luggage is temporarily placed in front of the gas meter or walls are installed. Even if it does, it will not interfere with the meter reading, so it will not actively check the position of the gas meter. Furthermore, the situation that the information necessary when the meter reader changes and takes over is not sufficiently transmitted, which makes it difficult to specify the position of the gas meter. However, when replacing the gas meter, there is a situation where it is desired to perform the replacement work in a short time. However, if searching for a hidden gas meter is also within the work range of the replacement worker, the work load on the replacement worker increases and the work efficiency deteriorates.

  When the conventional meter reading was performed, this problem was not caused because it was a visual meter reading. However, it was time to replace the gas meter equipped with the wireless metering system after the introduction of the wireless metering system began. It was discovered for the first time that there was such a problem. Therefore, the applicant has devised specifying a position using a specific low-power radio. This is because the wireless meter reading system performs wireless communication using a specific low power radio wave band. However, since the wireless meter reading system is based on the premise that the battery will not be replaced for a long time with power saving, it is set to send a short answer back signal for a short time with an interval of several tens of seconds with respect to the signal of the master unit. It has become. Therefore, it is difficult to specify the position using the existing technology using this answerback signal.

  Therefore, in order to solve such a problem, an object of the present invention is to provide a wireless metering meter position detection method capable of finding a gas meter using a wireless metering system in the field.

  In order to achieve the above object, a wireless metering meter position detection method according to an aspect of the present invention has the following characteristics.

(1) A slave unit that notifies the meter reading data using radio, a master unit that sends a transmission command signal so as to transmit a notification signal to the slave unit, and the notification signal notified from the slave unit is acquired. Receiving means connected to an antenna for receiving, storage means for acquiring data of the notification signal from the receiving means and recording the received intensity, and a display means for indicating the received intensity, as a first specific procedure, A plurality of receiving means including the antenna are arranged, the transmission command signal is output from the master unit, the notification signal corresponding to the transmission command signal is received by the receiving means, and each antenna is received by the display means. display received signal strength to identify the direction that exists in the slave machine, referring to the position of the antenna the signal strength is the highest, by repeating the first specific procedure, approximate slave machine Position to grasp the, as a second specifying step, the directional antenna comprising a cylindrical body for enhancing the directivity, connected to said receiving means, arranging a plurality of said receiving means with the directional antenna, the parent The transmission command signal is output from the machine, the notification signal corresponding to the transmission command signal is received by the receiving means, the signal strength received by the directional antenna is displayed by the display means, and the slave unit is displayed. When the position where the slave is present cannot be specified in the second specifying procedure, the second specifying is performed with reference to the position of the directional antenna having the highest signal strength. It is characterized in that the position of the slave unit is grasped by repeating the procedure.

  With the wireless metering meter position detection method according to one aspect of the present invention having such characteristics, the following operations and effects can be obtained.

  The aspect described in the above (1) is notified from the slave unit that notifies the meter reading data using radio, the master unit that sends a transmission command signal so as to transmit a notification signal to the slave unit, and the slave unit Wireless meter reading position detecting means comprising a receiving means connected to an antenna for obtaining a notification signal, a storage means for obtaining data of the notification signal from the receiving means and recording the received intensity, and a display means for indicating the received intensity It is a method, and it is possible to find the position of the target meter using the first specific procedure and the second specific procedure.

  As a first specifying procedure, a plurality of receiving means equipped with antennas are arranged, a transmission command signal is issued from the master unit, a notification signal corresponding to the transmission command signal is received by the receiving means, and a signal received by each antenna by the display means The strength is displayed and the direction where the handset exists is specified. For example, when there are three receiving means including the first antenna, receiving means including the second antenna, and three receiving means including the third antenna, the electric fields received by the receiving means are measured by arranging these receiving means side by side. The display means displays the intensity. As a result, it can be seen that the antenna having the highest signal detection strength among the three antennas is located near the slave unit. For example, if the signal detection intensity received by the first antenna is the highest, it means that there is a nearer meter to detect than the other two. Then, it can confirm that there is a meter in the direction of the closer antenna by arranging an antenna on the basis of the 1st antenna installation point, and repeating the 1st specific procedure.

  Next, as a second specific procedure, a directional antenna having a cylindrical body for enhancing directivity is connected to the receiving means, a plurality of receiving means having the directional antenna are arranged, and a transmission command signal is sent from the master unit. A notification signal corresponding to the transmission command signal is received by the receiving means, the signal strength received by each directional antenna is displayed by the display means, and the position where the slave unit exists is specified. By using the directional antenna, the accuracy of specifying the position of the slave unit is increased, so that the location can be easily specified. However, if an antenna with high directivity is used from the beginning, the efficiency of specifying the position of the meter is poor, so operation after narrowing the position to some extent is desirable.

  By such a wireless meter-reading meter position detection method, it is possible to specify the approximate position of the meter even in a case where the target meter is surrounded by a wall and shielded. When exchanging a meter whose wall has been closed, it is desirable to remove the wall by drilling a minimum part, etc., and to recover immediately after exchanging the meter. For this reason, it is possible to quickly identify the position of the wireless meter-reading meter and start the replacement work, thereby reducing the work burden on the replacement worker and contributing to shortening the replacement time. .

It is the figure which modeled the mode of the wireless meter-reading meter and information processing terminal of this embodiment. It is the schematic of the radio wave receiver of this embodiment. It is a block diagram regarding the intensity | strength indicator of this embodiment. It is a side view of a directional antenna of this embodiment. It is a flowchart regarding the direction specification procedure of this embodiment. It is a flowchart regarding the specific position specifying procedure of the present embodiment. It is a schematic plan view at the time of experiment of this embodiment. It is sectional drawing of a mode that the directional antenna of this embodiment was put in order.

  First, an embodiment of the present invention will be described.

  FIG. 1 schematically shows the relationship between the wireless meter-reading meter 10 and the information processing terminal 20 of the present embodiment. The wireless meter reading meter 10 is obtained by attaching a wireless communication device 14 to a normal gas meter 11. Conventionally, the meter reading of the gas meter 11 has been carried out by a method in which the meter reading person visually confirms the number displayed on the counter window 12 and grasps the amount of gas used. However, by attaching the wireless communication device 14 to the gas meter 11, meter reading can be performed by communication with the information processing terminal 20.

  The information processing terminal 20 is a dedicated terminal for meter reading that includes a liquid crystal screen 22, a keyboard 23, and a print output unit 24, and includes a wireless communication module 21. The wireless communication module 21 can communicate with the wireless communication device 14 using a specific low power radio wave band. The meter reading data from the gas meter 11 is acquired by the information processing terminal 20 in the form that the wireless meter reading meter 10 answers the communication command from the information processing terminal 20, and the data is stored in a storage area (not shown). Further, it is possible to output data from the print output unit 24 as necessary.

  FIG. 2 shows a schematic diagram of the radio wave receiver 30. The radio wave receiver 30 is a handy type specific low power radio device that is a handy radio device 31 and includes an antenna 32. An intensity indicator 35 is connected to the radio receiver 30, and the intensity indicator 35 includes a radio wave intensity display lamp 36 and a radio wave intensity display screen 37. The radio wave intensity display lamp 36 is a display unit using an LED lamp, and displays the received radio wave intensity step by step. On the radio wave intensity display screen 37, the radio wave intensity is displayed with numbers. The backlight switch 38 is a switch for turning on the backlight of the radio wave intensity display screen 37. The reset switch 39 is a switch for resetting the display.

  FIG. 3 shows a block diagram relating to the intensity indicator. The radio wave intensity display lamp 36 includes four lamps, a blue lamp 36a, a green lamp 36b, a yellow lamp 36c, and a red lamp 36d, and is turned on when a predetermined radio wave intensity is exceeded. The radio wave intensity display lamp 36 and the radio wave intensity display screen 37 are connected, and the data processing unit 40 connected to the radio wave intensity display screen 37 controls the radio wave intensity display lamp 36 and the radio wave intensity display screen 37. The backlight switch 38 is connected to the radio wave intensity display screen 37, and the reset switch 39 is connected to the data processing unit 40.

  The data processing unit 40 is connected to an amplification processing unit 41 and a power switch 43, and the amplification processing unit 41 is connected to an input 47 via a DC / DC converter 42, a power switch 43 and a switching circuit 48. The amplification processing unit 41 is also connected to the dry cell voltage monitoring circuit 45 via the switching circuit 48. An input 47 is a part for inputting a signal from the handy radio 31. The input 47 and the handy radio 31 are electrically connected so that signals can be transferred. The power switch 43 is connected to a battery case 44, and a battery (not shown) is accommodated in the battery case 44. A dry battery voltage monitoring circuit 45 is connected to the circuit connected to the power switch 43 to monitor the voltage of the battery stored in the battery case 44. The battery level is designed to be displayed using a radio wave intensity display lamp 36 when a confirmation button (not shown) is pressed.

  FIG. 4 shows a side view of the directional antenna. The directional antenna 50 is provided with an antenna portion 51 in the center of a metal cylindrical body 52. The antenna unit 51 includes a connection line 53, and the connection line 53 is connected to the handy radio 31 instead of the antenna 32. By connecting the directional antenna 50 to the handy radio 31, the radio waves detected by the handy radio 31 can be given directivity, so that the range can be easily specified.

  The configuration of the wireless metering meter position detection method of the present embodiment is as described above, and the operation procedure will be described next.

  FIG. 5 shows a flowchart regarding the direction specifying procedure. FIG. 6 shows a flowchart regarding the detailed position specifying procedure. The direction specifying procedure corresponding to the first specifying procedure is means for specifying a rough position of the wireless meter-reading meter 10. In a case where the wireless meter reading meter 10 cannot be visually confirmed when the meter reader goes to the site, the wireless meter reading meter 10 is detected using the radio wave receiver 30.

  First, in S10, a plurality of radio wave receivers 30 as receiving means are arranged side by side. The direction specifying procedure corresponds to the first specifying procedure. In the present embodiment, four sets of radio wave receivers 30 are prepared and arranged in a horizontal row. FIG. 7 shows a schematic plan view of the experiment. For convenience, the four radio wave receivers 30 are referred to as a first radio wave receiver 30a, a second radio wave receiver 30b, a third radio wave receiver 30c, and a fourth radio wave receiver 30d, respectively. Then, the process proceeds to S11.

  In S11, a transmission command signal from the parent device is transmitted. The information processing terminal 20 that is the master unit instructs the wireless communication device 14 of the wireless meter-reading meter 10 to output a signal. The signal from the master unit is sent out continuously for about 20 seconds. At this time, a repeater may be required depending on the system, but the description thereof is omitted here. In short, it is sufficient if there is a process in which an instruction from the information processing terminal 20 is transmitted to the wireless meter-reading meter 10 and a notification signal is returned as an answer back signal. Then, the process proceeds to S12.

  In S12, a notification signal is transmitted from the slave unit. When a transmission command signal is sent from the information processing terminal 20 which is a parent device, a notification signal is issued from the wireless communication device 14 provided in the wireless metering meter 10 which is a child device so as to respond thereto. The notification signal at this time is only a signal that is returned at intervals of 1 minute, 0.5 seconds each. Then, the process proceeds to S13.

  In S13, the notification signal is received by the receiving means. The radio wave receiver 30 serving as a receiving means receives signals at positions where the first radio wave receiver 30a to the fourth radio wave receiver 30d are arranged, and converts the signals as electric field strength. The signal appropriately amplified by the amplification processing unit 41 is converted into electric field strength by the data processing unit 40. Then, the process proceeds to S14.

  In S14, the signal intensity is displayed on the display means. The display means is a radio wave intensity display screen 37 provided in the radio wave receiver 30, which converts it into electric field intensity (bB) and displays it on the radio wave intensity display screen 37 and the radio wave intensity display lamp 36. As a result, the electric field strengths of the radio waves received by the first radio wave receiver 30a to the fourth radio wave receiver 30d are displayed on the respective radio wave intensity display lamps 36 and the radio wave intensity display screen 37. Then, the process proceeds to S15.

  In S15, it is determined whether the meter position can be specified. Since the electric field strength of each of the first radio wave receiver 30a to the fourth radio wave receiver 30d is displayed in S14, the antenna having the strongest electric field intensity is identified by comparing these, and the radio wave receiver is based on this antenna. Review the arrangement of 30 again. In FIG. 7, the radio wave intensity display lamp 36 and the radio wave intensity display screen 37 of the second radio wave receiver 30b indicate the strongest electric field intensity, and therefore the wireless meter meter 10 is in the vicinity thereof. Further, the electric field strength of the first radio wave receiver 30a is higher than that of the third radio wave receiver 30c. Therefore, it can be seen that the wireless meter-reading meter 10 is located near the second radio wave receiver 30b between the first radio wave receiver 30a and the second radio wave receiver 30b. In addition, since the electric field strength changes in proportion to the square of the distance from the wireless communication device 14, it is possible to grasp a certain distance. If the position of the wireless meter-reading meter 10 can be specified in this state, the specifying means is terminated, and if it cannot be specified, the process proceeds to S10.

  In S10, the position of the radio wave receiver 30 is changed, but the first radio wave receiver 30a to the fourth radio wave receiver 30d are referred to based on the measurement results of the first radio wave receiver 30a to the fourth radio wave receiver 30d performed last time. The handy radio 31 is moved. And it becomes possible to grasp | ascertain the approximate position of the wireless meter-reading meter 10 by repeating a measurement again.

  Next, specification of the detailed position will be described. The detailed position specifying procedure corresponds to the second specifying procedure. In S21, a directional antenna is connected. An antenna 32 as shown in FIG. 2 is attached to the handy radio 31 of the radio wave receiver 30. However, this type of dipole antenna has poor directivity and is not suitable for specifying a fine position. Therefore, in order to further enhance the directivity, a directional antenna 50 as shown in FIG. By doing so, instead of receiving a signal from the opening direction of the cylindrical body 52, it is possible to block signals from other directions.

  In S22, a plurality of directional antennas are arranged side by side. Since the directional antenna 50 is connected to the handy radio 31 by the connection line 53, it is possible to operate such that a plurality of the directional antennas 50 are arranged side by side on the wall. FIG. 8 is a cross-sectional view showing the directional antennas 50 arranged vertically. The first directional antenna 50a, the second directional antenna 50b, and the third directional antenna 50c are arranged vertically. The first directional antenna 50a is connected to the first radio wave receiver 30a, the second directional antenna 50b is connected to the second radio wave receiver 30b, and the third directional antenna 50c is connected to the third radio wave receiver 30c. ing. In such a state, the directional antenna 50 is held. Then, the process proceeds to S23.

  In S23, a transmission command signal is transmitted from the parent device. By transmitting a transmission command signal from the information processing terminal 20 that is the parent device, the wireless communication device 14 included in the wireless metering meter 10 that is the child device is instructed to answer back. Then, the process proceeds to S24. In S24, a notification signal is transmitted from the slave unit. In response to the signal from the information processing terminal 20, a notification signal is issued from the wireless communication device 14. Then, the process proceeds to S25.

  In S25, the notification signal is received by the receiving means. A notification signal from the wireless communication device 14 is received by the radio wave receiver 30 as a receiving means. As shown in FIG. 8, the radio wave receiver 30 uses three of the first radio wave receiver 30 a to the third radio wave receiver 30 c, and signals received by the directional antennas 50 are respectively received by the radio wave receiver 30. get. Then, the process proceeds to S26.

  In S26, the signal intensity is displayed on the display means. In the radio wave intensity display lamp 36 and the radio wave intensity display screen 37 which are display means, data which is appropriately amplified by the amplification processing unit 41 and converted into electric field strength by the data processing unit 40 is shown. As a result, the electric field strengths of the radio waves received by the first radio wave receiver 30a to the third radio wave receiver 30c are displayed on the respective radio wave intensity display lamps 36 and the radio wave intensity display screen 37. Then, the process proceeds to S27.

  In S27, it is determined whether the meter position can be specified. Of the first directional antenna 50a to the third directional antenna 50c, the second directional antenna 50b closest to the wireless meter-reading meter 10 receives the strongest signal, and the radio wave intensity display lamp of the second radio wave receiver 30b. 36 and the radio wave intensity display screen 37 show values higher than those of the other radio wave receivers 30. For this reason, it can confirm that the wireless meter-reading meter 10 exists near the 2nd directional antenna 50b. If the meter height can be specified, the process is terminated as it is. If the meter height cannot be specified, the process proceeds to S22, and the detailed position specifying procedure is performed again with reference to the position of the second directional antenna 50b.

  Since the wireless metering meter position detection method of the present embodiment has the above-described configuration, the following operations and effects are achieved.

  First, the wireless metering meter position detection method of the present embodiment makes it easy to specify the position of the wireless metering meter 10. The wireless metering meter position detection method of the present embodiment includes a wireless communication device 14 that notifies wireless metering data using wireless communication, and an information processing terminal 20 that transmits a transmission command signal so as to transmit a notification signal to the wireless communication device 14. A radio wave receiver 30 connected to the antenna 32 for acquiring a notification signal notified from the radio communication device 14, and a data processing unit 40 that acquires data of the notification signal from the radio wave receiver 30 and records the reception intensity. , A wireless metering meter position detection method provided with a radio wave intensity display lamp 36 indicating reception intensity and a radio wave intensity display screen 37, and the position of the target wireless metering meter 10 is determined using the first specifying procedure and the second specifying procedure. It is possible to find out.

  As a first identification procedure that is a direction identification procedure, a plurality of radio wave receivers 30 provided with an antenna 32 are arranged, a transmission command signal is issued from the wireless communication device 14, and a notification signal corresponding to the transmission command signal is received by the radio wave receiver 30. Then, the signal strength received by each antenna 32 is displayed on the radio wave intensity display lamp 36 and the radio wave intensity display screen 37, and the direction in which the wireless communication device 14 exists is specified. And as a 2nd specific procedure which is a detailed position specific procedure, the directional antenna 50 provided with the cylindrical body for improving directivity is connected to the radio wave receiver 30, and the radio wave receiver provided with the directional antenna 50 30 are arranged, a transmission command signal is issued from the information processing terminal 20, a notification signal corresponding to the transmission command signal is received by the radio wave receiver 30, and each directivity is received by the radio wave intensity display lamp 36 and the radio wave intensity display screen 37. The signal strength received by the antenna 50 is displayed, and the position where the wireless communication device 14 exists is specified.

  The wireless communication device 14 used in the wireless meter-reading meter 10 obtains power saving and returns a signal for a very short time at a predetermined interval, as shown in the problem. Accordingly, by measuring the electric field strength received by each of the plurality of radio wave receivers 30, the approximate position of the wireless meter-reading meter 10 can be specified. With this configuration, even when the information processing terminal 20 sends a signal to the wireless communication device 14 using a repeater, the position of the wireless metering meter 10 can be specified by the same processing. Since there is a weak reply signal from the repeater side and a stronger reply signal is returned from the wireless communication apparatus 14 side, the sampling period is shortened and sampling is performed a plurality of times to obtain the strongest value. The intensity is displayed on the radio wave intensity display lamp 36 and the radio wave intensity display screen 37.

  Even in the case where the wireless metering meter 10 is installed on the other side of the plywood wall 100 as shown in FIG. 7 described above, the first radio wave receiver 30a to the fourth radio wave receiver 30d transmit radio waves respectively. Receive. Then, the worker refers to the numerical values shown on the respective radio field intensity display lamps 36 and the radio field intensity display screen 37, which of the first radio wave receiver 30a to the fourth radio wave receiver 30d is closest to the wireless metering meter 10. Determine whether. By repeating this first specific procedure a plurality of times as necessary, the approximate position of the wireless meter-reading meter 10 can be grasped.

  Further, the detailed position can be specified by the second specifying procedure. The direction of the radio wave that can be acquired by the antenna unit 51 is reduced by the directional antenna 50. Therefore, it can be grasped in more detail than the first specific procedure as to which height of the plywood wall 100 the wireless metering meter 10 is installed. In FIG. 8, the directional antennas 50 are arranged vertically, but the detailed position can be determined by arranging the directional antennas 50 at arbitrary positions. For example, even if they are arranged in a horizontal row or arranged obliquely, the directivity antenna 50 closest to the gas meter 11 does not change in that it receives the strongest radio wave, so it is the same as when arranged vertically. In addition, the position of the wireless meter-reading meter 10 can be specified. In short, since the directivity of the reception range is enhanced by the directional antenna 50, if the detailed position of the wireless metering meter 10 can be specified using this, there is no need to be particularly concerned with the arrangement. And the detailed position of the wireless meter-reading meter 10 can be grasped | ascertained by repeating a 2nd specific procedure.

  As indicated in the problem, there are cases where the location of the wireless metering meter 10 is lost because wireless communication is possible, and in some cases, a wall such as the plywood wall 100 is made before that. There is also. In this case, an operator who has performed an exchange operation of the gas meter 11 cannot search for the wireless meter-reading meter 10.

  Since the plywood wall 100 is a facility on the customer side, it cannot be removed easily. Moreover, since it is necessary to repair the damaged part at the burden of the operator side, there is a demand for keeping the damaged part to a minimum. Even in such a case, the wireless metering meter 10 can be found smoothly by the wireless metering meter position detection method shown in the present embodiment. After discovery, the plywood wall 100 can be drilled with the minimum necessary, the wireless metering meter 10 can be replaced, and then the plywood wall 100 can be repaired. Although it is desirable, this can be realized by the method of detecting the position of the wireless meter-reading meter.

  Regarding the radio wave intensity display lamp 36, the voltage of the dry battery stored in the battery case 44 is monitored by the dry battery voltage monitoring circuit 45, and the voltage level of the dry battery is displayed by switching the switching circuit 48. Can also be used.

  Although the invention has been described according to the present embodiment, the invention is not limited to the embodiment, and by appropriately changing a part of the configuration without departing from the spirit of the invention. It can also be implemented.

  For example, the information processing terminal 20 and the radio wave receiver 30 do not prevent the unit from being integrated as necessary. In addition, the radio receiver 30 also does not interfere with the configuration in which the functions of the first radio receiver 30a to the fourth radio receiver 30d are integrated and only the antenna 32 can be arranged separately. Further, although it has been described that the four radio wave receivers 30 are used for the direction specifying procedure and the three radio wave receivers 30 are used for the detailed position specifying procedure when specifying the wireless communication device 14, this number is changed. I will not prevent it. However, it is desirable to have a simple configuration that is assumed to be used by field workers.

DESCRIPTION OF SYMBOLS 10 Wireless meter meter 11 Gas meter 12 Counter window 14 Wireless communication apparatus 20 Information processing terminal 30 Radio wave receiver 31 Handy radio 32 Antenna 35 Strength indicator 36 Radio wave intensity display lamp 37 Radio wave intensity display screen 50 Directional antenna 51 Antenna part 52 Cylinder Body 53 connection line

Claims (1)

A handset that notifies the meter reading data wirelessly;
A master unit that sends a transmission command signal so as to transmit a notification signal to the slave unit;
Receiving means connected to an antenna for acquiring the notification signal notified from the slave unit, storage means for acquiring data of the notification signal from the receiving means and recording the reception intensity, and indicating the reception intensity Display means,
As the first specific procedure,
Arranging a plurality of the receiving means provided with the antenna,
The transmission command signal is issued from the master unit,
The notification signal corresponding to the transmission command signal is received by the receiving unit, the signal strength received by each antenna is displayed by the display unit, and the direction in which the slave unit exists is specified,
By referring to the position of the antenna having the highest signal strength, by repeating the first specific procedure, grasp the approximate position of the slave unit,
As a second specific procedure,
A directional antenna provided with a cylindrical body for enhancing directivity is connected to the receiving means, and a plurality of the receiving means provided with the directional antenna are arranged,
The transmission command signal is issued from the master unit,
The notification signal in response to the transmission command signal is received by the receiving unit, the signal strength received by the directional antenna is displayed by the display unit, and the position where the slave unit exists is specified,
When the position where the slave is present cannot be specified by the second specifying procedure, the child specifying unit repeats the second specifying procedure with reference to the position of the directional antenna having the highest signal strength. Knowing the position of the machine,
A method for detecting the position of a wireless meter-reading meter.

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