JP2001251692A - Radio meter-reading system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio meter-reading system capable of eliminating any complicated frequency management without incorporating plural kinds of frequency transmitting parts into a slave set. SOLUTION: Each of slave sets 3a, 3b, 3c and 3d is provided with at least a means for measuring a call signal communication speed. When the slave set 3a, 3b, 3c or 3d recognizes that the communication speed of the received call signal is the preset specified speed, the slave set confirms whether or not it is its own number, then a radio line is established with a master set 2A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless meter reading system in which a master unit can remotely read a meter by wireless communication with a slave unit provided in a meter such as a gas meter or a water meter.

[0002]

2. Description of the Related Art In a conventional wireless meter reading system, in order to prevent a malfunction due to interference, for example, a communication area in which a radio wave reaching area where a radio wave of a base unit reaches is divided into a plurality of communication areas. A dedicated frequency is set for each communication area and wireless communication is possible only there. For this reason, in order for the master unit to wirelessly communicate with the slave units in a plurality of communication areas, it is necessary to provide the master unit with a plurality of frequency transmission units.

For example, in FIG. 9, when a master unit A communicates with a slave unit a in a communication area 1, the communication is performed at a frequency F1, and the same master unit A communicates with a slave unit c in another communication area 2. When performing, it was performed at the frequency F2.

[0004]

As described above, if the frequency differs according to the communication area, a slave unit having a different frequency must be used for each communication area. A wireless system that mounts several types and switches the frequency for each communication area is also employed.

However, in this radio communication system, the cost is greatly increased, and as the number of communication areas increases, the frequency management of the slave unit becomes complicated and troublesome.

In view of the above circumstances, a first object of the present invention is to provide a wireless meter reading system which does not need to incorporate a plurality of types of frequency transmitting units in a slave unit and does not need to perform complicated frequency management. Is to do.

[0007] Further, for example, if a malfunction such as interference occurs with another slave unit during wireless communication with a specific slave unit, there is a possibility that wireless meter reading cannot be performed.

Accordingly, a second object of the present invention is to provide a wireless communication system capable of setting for performing wireless communication at various communication speeds different for each communication area.

In some cases, a trouble occurs in the slave unit and the communication speed normally used cannot be used.

Therefore, a third object of the present invention is to set a different communication speed again and perform wireless communication even if a trouble occurs in the slave unit and the communication speed normally used cannot be used. An object of the present invention is to provide a wireless communication system that can be used.

Further, for example, even if the communication speed is changed to another communication speed when the communication speed normally used cannot be used due to some trouble in the slave unit, for example, In some cases, it is necessary to perform cumbersome operations such as opening the inside of the casing of the machine and actually adjusting various fine electric circuits, etc., and it is difficult and inconvenient for those who are unfamiliar with operations without electrical knowledge It may also involve complicated operations.

Accordingly, a fourth object of the present invention is to provide a simple and simple method of electrically inputting a predetermined external signal even if a trouble occurs in the slave unit and the communication speed normally used cannot be used. It is an object of the present invention to provide a wireless communication system that can perform wireless communication by newly setting another communication speed even if the operation is unfamiliar with the operation.

Further, for example, when a trouble occurs in the slave unit and the communication speed normally used cannot be used, it is necessary to go to the place where the slave unit is installed and change it. It takes time and effort to restore the wireless line so that meter reading can be performed, resulting in a decrease in work efficiency.

Therefore, a fifth object of the present invention is to provide a wireless communication system which eliminates the inconvenience of having to stop by a handset and change / set the communication speed every time the communication speed is changed. is there.

[0015] In addition, in addition to the slave unit that attempts to wirelessly communicate with the master unit, the wireless communication reachable area from the master unit may include:
If there is another slave unit having the same ID number but a different communication area, there is a possibility that a trouble may occur that another slave unit having the same ID number is operated without notice.

Accordingly, a sixth object of the present invention is to prevent a malfunction such as performing wireless communication between another slave unit having the same ID number and the like and the master unit, and to prevent unrelated slave units within the same area. It is an object of the present invention to provide a wireless meter reading system that enables a machine to shorten a determination time until a transmission / reception operation is stopped, thereby realizing a highly reliable wireless meter reading.

In addition, a meter reader or the like forgets the communication speed of a certain child device during a meter reading operation with a mobile parent device, and wonders which of several communication speeds is correct. In such a case, for example, it is necessary to perform operations such as contacting the headquarters to check the communication speed with the child device, and the workability is poor.

Therefore, a seventh object of the present invention is to read and confirm the data relating to the communication speed of a slave unit even when the master unit has forgotten the communication speed of the slave unit. It is an object of the present invention to provide a wireless meter reading system that can promptly cope with such a situation and can reliably perform wireless communication with all the slaves.

[0019]

According to a first aspect of the present invention, there is provided a master unit, a slave unit, and a scale connected to the slave unit, wherein a call signal is transmitted from the master unit to the slave unit. In a wireless meter reading system that establishes a wireless line with a slave unit that matches the calling signal and performs wireless meter reading of the measuring device with the master unit, at least the slave unit measures the communication speed of the calling signal. Means, when the slave unit recognizes that the communication speed of the received call signal is a specific communication speed set in advance, confirms whether the communication speed is its own ID number, A wireless line is established with the master unit.

According to a second aspect of the present invention, in the first aspect of the present invention, the communication speed is set differently for each communication area.

According to a third aspect of the present invention, in the first or second aspect, at least one of the master unit and the slave unit is set to perform wireless communication at various communication speeds or the communication speed is changed. The communication speed changing unit for performing the communication is provided, and the wireless communication is performed at the communication speed set by the communication speed changing unit.

According to a fourth aspect of the present invention, in the first aspect of the present invention, at least one of the master unit and the slave unit sets a specific communication speed based on an external signal. A signal input unit is provided so that when an external signal is input, wireless communication is performed at the communication speed.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the master unit and the slave unit include a communication speed to be subsequently used by wireless communication between the master unit and the slave unit. It is configured to transmit and receive data and perform subsequent wireless communication at the communication speed.

According to a sixth aspect of the present invention, in the wireless communication performed between the master unit and the slave unit in the invention according to any one of the first to fourth aspects, it is included in the communication content. By confirming and recognizing the designated data of the communication speed, the wireless communication is thereafter performed at the designated communication speed.

According to a seventh aspect of the present invention, in the first aspect of the invention, at least one of the master unit and the slave unit is provided with an external starting unit, and the external starting unit is provided with the external starting unit. Only when this signal is received, the master unit or the slave unit can perform wireless communication at a common communication speed.

[0026]

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows the configuration of a wireless meter reading system according to a first embodiment of the present invention. In this embodiment, a main unit 2 is connected to a portable terminal 1 which is portable.
The wireless communication with the slave unit 3 is performed by the control signal from.

The slave unit 3 is connected to a meter 4 of a measuring device. The meter unit 4 can collect meter information from the meter 4 by wireless communication from the master unit 2 and can send information of the slave unit 3 to the master unit 2. By transmitting the information and collecting the information by the base unit 2 or responding to the handy terminal 1, wireless meter reading can be performed from a remote place.

Next, a wireless meter reading system according to a second embodiment of the present invention will be described. In this embodiment shown in FIG. 2, a telephone line L is used, the base unit 2 is connected to a terminal network control device 5 of a terminal of the telephone line L, and a control signal transmitted from a center (not shown) is used. The base unit 2 issues a call signal for a communication request to the slave unit 3 to call, and collects meter information of the meter 4 of the measuring device connected to the slave unit 3. In this way, by responding to the center, wireless meter reading is performed by using wireless communication remotely.

Next, a wireless device used in the wireless meter reading system according to the present invention will be described. FIG. 3 is an embodiment showing a wireless device 6 provided in the master unit 2 and the slave unit 3 according to the present invention. In the wireless device 6, the communication speed changing unit 6
A, an external signal input unit 6B, a communication speed storage unit 6C,
An external activation unit 6D, a wireless transmission / reception unit 6E, and a control unit 6F are provided.

The communication speed changing unit 6A is provided with, for example, a switch, a dip switch, a rotary switch, a reed switch, and the like.
F detects and recognizes the communication speed of the set condition as its own communication speed.

The external signal input unit 6B transmits a setting input signal (data communication) from the external signal input unit 6B to the control unit 6F.
Recognizes that the communication speed that matches the content of the setting input signal can be set as its own communication speed. Also, the communication speed for a specific slave unit can be set.

The communication speed storage unit 6C stores the communication speed used for wireless transmission / reception, and can perform rewriting / reading under the control of the control unit 6F. The communication speed storage unit 6C stores and manages the communication speed transmitted by the own station, the communication speed received by the own station, or the communication speed of wireless transmission / reception to / from a specific slave unit.

A reed switch is used for the external activation unit 6D. When a signal from the external activation unit 6D is detected by the control unit 6F, the signal is input while the signal is being input or for a predetermined time after the signal is input. During the interval, wireless communication at a specific communication speed is enabled.

The radio transmission / reception section 6E performs radio transmission / reception with the outside under the control of the control section 6F.

The control unit 6F detects the setting condition of the communication speed changing unit 6A and stores the set communication speed in the communication speed storage unit 6A.
The communication speed is set in the communication speed storage unit 6C according to a setting signal input from the external signal input unit 6B or stored in the communication speed storage unit 6C.

Further, the control section 6F has a function of measuring the communication speed of the calling signal, and the radio transmission / reception section 6E
And fetches wireless communication data, and measures the communication speed of the call signal from the fetched wireless communication data. The control unit 6F checks whether or not the measured communication speed matches the communication speed stored in the communication speed storage unit 6C. The communication speed is used to check whether or not the ID number is its own ID number, and whether or not the wireless communication is the wireless communication for the own station is identified. Therefore, if this is different, the power supply to the wireless transmission / reception unit is immediately cut off, and if they match, transmission / reception of the wireless communication is performed according to the communication procedure, or the respective transmission is performed according to the contents stored in the communication speed storage unit 6C. Wireless communication is performed with a wireless station.

The control unit 6F includes an external activation unit 6D
When an external signal is recognized, it is necessary to prepare for the exchange of wireless communication sent at a specific communication speed while recognizing the external signal or for a certain period of time after recognizing it. Or wireless transmission.

Next, the control operation of the slave unit 3 shown in FIGS. 1 and 2 will be described with reference to the flowchart shown in FIG.

In the first step S1, the slave unit 3 performs a wireless communication receiving operation by intermittent driving in order to receive external wireless communication with low power consumption. For that purpose, a timer for the intermittent reception interval is set.

In the second step S2, it is monitored whether or not the timer for the intermittent reception interval has expired.

In the third step S3, if this time has elapsed, power is supplied to receive wireless communication.

In the fourth step S4, the radio transmitting / receiving section 6E
By starting power supply to the wireless communication unit 6E
For example, wireless data of a wireless frequency used by the wireless station is fetched.

In a fifth step S5, the control section 6F measures the communication speed of the fetched wireless data.

In the sixth step S6, the control unit 6F determines whether or not the communication speed has to be recognized by the own station. If the control unit 6F determines that the communication speed is not the one to be recognized, the control unit 6F cuts off the power supply to the wireless transmission / reception unit 6E to reduce power consumption, and again performs the first step S1
Prepare for the next wireless communication starting with.

In the seventh step S7, the fifth step S5
From the contents of the wireless data such as the communication speed captured by the own station, it is determined whether the communication speed is to be recognized by the own station, and if the communication speed matches, the ID of the own device is used at that communication speed It is checked whether it is a number or not, and it is determined whether or not it matches its own ID number stored in advance. If the communication speed and the ID number do not match those of the own device, the power supply to the wireless transmission / reception unit 6E is turned off in order to reduce the power consumption, and again from the first step S1. Prepare for the next wireless communication that will begin.

In the eighth step S8, the transmission I
If the D number matches the self-ID number at the communication speed, the slave unit 3 transmits a response signal to the master unit to establish a wireless line with the master unit. Prior to this, carrier sense is performed for a certain period.

In the ninth step S9, if transmission becomes possible as a result of the carrier sense, the radio transmission / reception unit 6E is controlled to transmit a response signal in order to establish a radio channel with the transmitting station.

In the tenth step S10 and the eleventh step S11, when the establishment of the wireless line with the master unit 2 is completed, mutual communication is performed according to the request communication from the master unit 2, and Collect information.

In the twelfth step S12, the wireless line with the master unit 2 is terminated, the power supply to the wireless transmission / reception unit 6E is stopped, and the next wireless communication starting from the first step S1 is prepared again.

Next, a wireless meter reading system according to the present invention will be described with reference to FIG. FIG. 5 is a block diagram showing a usage mode in consideration of a communication area when the wireless metering system according to the present invention is actually used.

In the radio wave reach area X (communication area 1 / communication area 2) of the master unit 2A, the slave units 3a to 3c
In the radio wave reach area Y (communication area 3 / communication area 4) of the master unit 2B, there are slave units 3c and 3d. Here, for example, the ID numbers of the child devices 3a to 3d are respectively 30 to child devices 60, and the communication speed is 200, 200, 300, 200 (b) in the order of the child devices 3a to 3d.
ps).

Now, suppose that base unit 2A transmits the communication speed of the wireless transmission data at 200 bps with the ID number of the call signal set to ID30 in order to acquire information from child unit 3a.

At this time, in response to the call signal transmitted from master device 2A at a communication speed of 200 bps, slave device 3b has the communication speed of its own station, but since the ID number is different, the response to the call signal is However, the handset 3c does not respond to the call signal because the communication speed of the handset 3c is different from that of the own station.

On the other hand, only the slave unit 3a transmits a response signal for establishing a wireless line because the communication speed of the slave unit is the same as that of the slave unit and the ID number also matches. Thereafter, transmission and reception of wireless data are performed in accordance with the request communication from master device 2A.

Next, the master unit 2B includes a slave unit 3c operating at a communication speed of 300 bps and a slave unit 3d operating at a communication speed of 200 bps within the wireless area of its own station. When wireless communication is performed, the effect on other slave units can be reduced by using different communication speeds.

For example, even if a call signal is transmitted at a communication speed of 300 bps in an attempt to call the slave unit 3c from the master unit 2B, the slave unit in the same radio wave reach area Y but in another communication area is transmitted. The device 3d can stop the reading operation when the communication speed is measured, because the wireless communication speed is different from its own wireless communication speed of 200 bps. Also, suppose that the same ID exists in the radio wave reach area Y from the base unit 2B.
Even if there is a slave unit with a number, wireless communication can be performed without causing a malfunction by changing the communication speed.

Further, this time, when the terminal is called from the slave unit to the master unit, the communication speed 3 at the time of the calling signal from the master unit is used.
Communication speed different from 00 bps, for example, 600 bps
By transmitting from the slave unit to the master unit, the wireless communication with the target master unit is established without causing other slave units within the radio wave reach area from the slave unit to malfunction. Becomes possible.

Next, the operation timing of each slave unit described with reference to FIG. 5 will be described with reference to FIG.

A call signal from master unit 2A, ie, ID
When the number is ID30 and the communication speed is 200 bps, the reception control of the slave unit 3c immediately shuts off the wireless reception circuit because the transmitted communication speed is different from the communication speed of its own station of 300 bps.

On the other hand, since the communication speed of the slave unit 3b is equal to the communication speed of the own station, it is next determined whether or not the content is the ID number of the own station. In the case of the slave 3b, since this is different, the wireless receiving circuit is shut off. Here, when confirming its own ID number, it is more convenient for each slave unit to take in at least two transmission ID numbers from the master unit and make a determination. As a result, the reliability of the confirmation work for the ID number is improved.

Since the communication speed is equal to the communication speed of the own station and the content thereof matches the ID number of the own station, slave unit 3a confirms that the calling signal from master unit 2A has ended, A response signal for establishing a wireless line with the device 2A is transmitted. Thereafter, the master unit 2A and the slave unit 3a perform wireless transmission and reception, and the master unit 2A can collect information of the measuring device connected to the slave unit 3a.

Further, after transmitting the response signal from the child device 3a, the communication speed used by the peripheral device for collecting the radio information such as the radio request signal from the parent device 2A and the radio information response signal from the child device 3a. It can also be performed at a different communication speed. Thereby, for example, in FIG. 6, the reception signal 3b-2 of the slave unit 3b does not perform the operation of determining the own station ID number as in the reception signal 3b-1, but performs wireless reception in a short time. Circuit can be interrupted.

As a method for this purpose, besides this,
For example, for each ID number continuously transmitted from the base unit 2A, the communication speed information is transmitted after the ID number,
It may be transmitted at the end of the ID number transmitted continuously. Alternatively, the information can be included in the wireless transmission / reception communication after receiving the response signal from the child device, or the information can be included in the response signal from the child device, and designated from the child device to the parent device. .

Next, another example according to the present invention will be described with reference to the drawings. In this example shown in FIG. 7, it is assumed that the parent device 7 and the child device 8 are initially performing wireless communication at a communication speed of 200 bps. Then, the currently used communication speed is changed to the communication speed to be used in the future (that is, 20 communication speeds).
To change the communication speed from 0 bps to 500 bps), in the wireless communication transmitted from the master unit 7 to the slave unit 8, data (communication speed change request) including communication speed data relating to the changed communication speed is transmitted.

The slave unit 8 receives the data including the communication speed, and checks the communication speed included in the data.
When it is recognized, the subsequent wireless communication with the master unit 7 is performed only at the communication speed of 500 bps.

As a result, the master unit 7 and the slave unit 8 establish a new communication speed based on the data included in the wireless communication.
A call signal is transmitted and received at 00 bps, and a series of wireless meter reading operations from establishment of a wireless line to communication of meter reading end are performed.

Next, still another example according to the present invention will be described with reference to the drawings. In the example shown in FIG. 8, in the wireless communication performed between the master unit 7 and the slave unit 8, (communication speed designation request) data including (designated communication speed) data related to the designated communication speed included therein. , And thereafter, wireless communication is performed at the designated communication speed.

For example, first, a calling signal is transmitted from the master unit 7 to the slave unit 8 at a communication speed of 200 bps. On the other hand, from the slave 8 that has received this, a response signal is transmitted to the master 7 in order to respond to this, and the wireless line is established.

When the wireless line is established in this way, it is assumed that, for example, the communication content of the wireless communication transmitted from the base unit 7 includes (communication speed designation request) data. Then, the slave unit 8 that has received the signal transmits a (communication speed designation response) signal in order to respond to this.
Send to. Further, at the same time, the slave unit 8 that has confirmed and recognized the (communication speed designation request) data receives the wireless communication from the master unit 7 thereafter, so that the communication speed 500
Change to wait at bps.

On the other hand, when the master unit 7 receives a (communication speed designation response) signal from the slave unit 8, the communication speed becomes 200 bp.
The communication speed is changed from the communication at s to the communication at 500 bps.

As described above, when the communication speed is 200 bps
Is changed to 500 bps, so that
Even if another slave unit that stands by at a communication speed of 200 bps receives a communication of 500 bps, it can quickly determine that the communication speed is different from 200 bps, so that a malfunction does not occur. .

Next, still another example according to the present invention will be described. In this example, the slave unit is provided with an external activating unit, and only when a signal from the external activating unit is received, the slave unit and the master unit can perform wireless communication at a common communication speed, for example, at 700 bps. It is composed. Note that the external start unit may not be provided only in the slave unit as in this example, but may be provided in both units.

Therefore, according to the wireless meter reading system having such a configuration, for example, it is assumed that a certain slave unit is currently waiting at a communication speed of 200 bps. Here, it is assumed that the meter reader turns on the reed switch attached to the slave unit with a magnet.

Then, the slave unit has a common 70
It waits for a fixed time at a communication speed of 0 bps.
Within a certain period of time, the meter reader operates the parent machine to
At a communication speed of ps, a communication signal (a signal requesting to notify the “original communication speed” of the slave unit that has been set in advance) is transmitted to the slave unit.

As a result, the slave transmits a reply that the "original communication speed" is 200 bps to the master as a (answer) signal. As a result, the communication speed of the slave unit that has been forgotten here can be confirmed by the master unit. Such a check operation can be similarly performed between each slave unit and the master unit. Therefore, it is possible to easily check the "original communication speed" set for each slave unit.

[0076]

As described above, according to the present invention, at least the slave unit has means for measuring the communication speed of the calling signal, and the slave unit sets the communication speed of the received calling signal in advance. When it is recognized that the communication speed is a specific communication speed, it is checked whether or not the communication speed is its own ID number.
It is configured to establish a wireless line with the master unit, and distinguishes it from other slave units by using different communication speeds instead of using multiple types of frequencies. This eliminates the need for a built-in frequency transmitting unit, which is advantageous for cost reduction and device size reduction.

On the other hand, at this time, if the communication speed of the slave unit that does not perform communication with the master unit is not a recognizable communication speed, it is possible to immediately confirm that it is not the wireless communication with the slave unit of the own station. In the case of a wireless communication system using a plurality of communication frequencies as in the past, it is necessary to confirm communication at each frequency. Can be shortened, and power consumption can be saved. Thus, an inexpensive and low power consumption type wireless communication system can be realized.

Further, according to the second aspect of the present invention,
The communication speed is set to be different for each communication area, and the communication area is divided so that wireless meter reading can be performed at the same communication speed only in the same communication area. During wireless communication with a specific slave unit close to the boundary of the device, malfunctions such as interference with the slave unit in another communication area can be prevented and wireless meter reading cannot be performed. As a result, a highly reliable wireless communication system can be realized.

Further, according to the third aspect of the present invention, at least one of the master unit and the slave unit is provided with a communication speed changing unit for setting or changing the communication speed for performing wireless communication at various communication speeds, The wireless communication is performed at the communication speed set by the communication speed changing unit. Therefore, for example, if a malfunction such as interference occurs with another slave unit during wireless communication with a specific slave unit, the malfunction is performed by operating the communication speed changing unit provided in the master unit. The change to another communication speed that the other handset that caused it can not recognize,
Since the measurement can be performed directly on the spot and immediately, the workability of the wireless meter reading system can be improved. In particular, when the communication speed changing unit is configured by a reed switch, another communication speed is easily changed from the outside of the casing of the radio station such as the master unit and the slave unit by an on / off cycle by a magnet or the like. Since the setting can be changed, the casing structure of these radio stations is simplified.

According to the present invention, at least one of the master unit and the slave unit is provided with an external signal input unit for setting a specific communication speed based on an external signal. The wireless communication is performed at the communication speed. For example, the transmission communication speed and the reception communication speed of the slave unit can be individually changed by a wired electric signal operation. Therefore, it is possible to change the communication speed with the slave unit by wire if necessary, so even if the communication speed normally used cannot be used due to some trouble in the slave unit, for example, Even without opening the inside of the casing etc. and actually tweaking various electric circuits etc., it is possible to set a new communication speed by operating a wired external signal and perform wireless communication, and handling is possible. A simple and highly reliable wireless communication system can be realized.

According to the fifth aspect of the present invention, the master unit and the slave unit transmit and receive data including the communication speed to be subsequently used by the wireless communication between them, and use the wireless communication thereafter to transmit and receive data at the communication speed thereafter. This is convenient because every time the communication speed is changed, there is no need to stop by the location of the slave unit and change / set the communication speed.

Further, according to the invention of claim 6, for example, in addition to the slave unit that is to wirelessly communicate with the master unit, the slave unit having the same ID number is located in the wireless communication reachable area from the master unit. Even if exists separately, by changing the subsequent communication speed to another different one, it is possible to prevent wireless communication with another slave unit having the same ID number thereafter, so that
Thereafter, the malfunction of the slave unit can be prevented. This allows
It is also possible to reduce the time required to stop the transmission / reception operation for unrelated slaves in the same area, thereby realizing a highly reliable wireless metering system and reducing power consumption.

According to the seventh aspect of the present invention, at least one of the master unit and the slave unit is provided with an external start unit, and only when a signal from the external start unit is received, is the master unit or the slave unit set. Are configured to enable wireless communication at a common communication speed.For example, even when the master unit forgets the communication speed of a certain slave unit, this function The original communication speed can be read and confirmed by the communication speed, and it is possible to quickly cope with such a situation, so that wireless communication with all the slaves can be reliably performed. At this time, for example, by recognizing the external starting unit from outside the casing of the master unit or the slave unit using a magnetic force or the like like a reed switch, the casing structure of the master unit or the slave unit is simplified.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a wireless meter reading system according to a first example of the present invention.

FIG. 2 is a schematic configuration diagram showing a wireless meter reading system according to a second example of the present invention.

FIG. 3 is a configuration block diagram showing a wireless device according to the present invention.

FIG. 4 is a flowchart showing control of the slave unit.

FIG. 5 is an explanatory diagram showing a radio wave reaching area and a communication area in a wireless area of a master unit and a slave unit using the system.

FIG. 6 is a timing chart showing the operation of the slave unit.

FIG. 7 is an explanatory diagram showing a flow of a wireless meter reading system according to another example of the present invention.

FIG. 8 is an explanatory diagram showing a flow of a wireless meter reading system according to still another example of the present invention.

FIG. 9 is an explanatory diagram showing a relationship between a communication area between a parent device and a child device and a radio wave reach area using a conventional system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Handy terminal 2 Base unit 3 Remote unit 4 Meter of measuring device 5 Network control device for terminal 6 Wireless device 6A Communication speed change unit 6B External signal input unit 6D External start unit 7 Main unit 8 Remote unit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Norio Nakane 2-2-1 Nishiki, Naka-ku, Nagoya City, Aichi Prefecture Inside Ricoh Elemex Co., Ltd. (72) Inventor Akira Shimizu 2-Nishiki 2, Naka-ku, Nagoya City, Aichi Prefecture No. 13 Ricoh Elemex Co., Ltd. F-term (reference) 2F073 AA07 AA08 AA34 AB02 BB01 BC02 CC11 DE12 GG01 GG07 GG08 5K048 AA06 AA09 AA16 BA36 CA03 CA13 DB01 DC01 DC07 EA16 EB10 HA01 HA02

Claims (7)

[Claims] An apparatus comprising: a master unit and a slave unit; and a weighing device connected to the slave unit, transmitting a calling signal from the master unit to the slave unit,
In a wireless meter reading system for establishing a wireless line with a slave unit that matches the calling signal and performing wireless meter reading of the measuring device with the master unit, at least the slave unit measures the communication speed of the calling signal. When the slave unit recognizes that the communication speed of the received call signal is a specific communication speed set in advance, it checks whether the communication speed is its own ID number or not, and A wireless meter reading system configured to establish a wireless line with a master unit. 2. The wireless metering system according to claim 1, wherein the communication speed is set to be different for each communication area. 3. A communication speed changing unit for setting or changing the communication speed for wireless communication at various communication speeds is provided in at least one of the master unit and the slave unit, and the communication speed changing unit sets the communication speed. The wireless meter reading system according to claim 1, wherein wireless communication is performed at a communication speed. 4. An arrangement in which at least one of the master unit and the slave unit is provided with an external signal input unit for setting a specific communication speed based on an external signal, and performs wireless communication at the communication speed when an external signal is input. The wireless meter reading system according to any one of claims 1 to 3, wherein: 5. The wireless communication device according to claim 1, wherein the master unit and the slave unit transmit and receive data including a communication speed to be subsequently used by wireless communication therebetween, and perform wireless communication thereafter at the communication speed. Any one of claims 1 to 4
Wireless meter reading system according to the item. 6. In a wireless communication performed between a master unit and a slave unit, by confirming and recognizing communication speed designation data included in the communication contents, the wireless communication is thereafter performed at the designated communication speed. The wireless meter reading system according to any one of claims 1 to 4, wherein the wireless meter reading system is configured to perform communication. 7. An external activating unit is provided in at least one of the master unit and the slave unit. Only when a signal from the external activating unit is received, the master unit or the slave unit performs wireless communication at a common communication speed. The wireless metering system according to any one of claims 1 to 6, wherein the wireless metering system is configured to be enabled.