JPH07184276A - Radio system for automatic metering - Google Patents

Abstract

PURPOSE:To eliminate interference from other system by setting a communication channel for radio communication and a communication time for synchronization matching with a clock circuit. CONSTITUTION:A clock circuit 17 is a circuit to implement time management of a radio equipment and a time synchronization matching communication time and communication channel setting circuit 18 is a circuit to set a time synchronization matching communication time and a communication channel for time synchronization matching communication. Then the communication channel and the time synchronization matching communication time in the radio communication between a master radio equipment 27 and a slave radio equipment 28 are distributed to avoid interference with radio communication of other systems by using a call code. That is, when the communication time as the time synchronization matching communication time is distributed to 24 hours (each due time), for example, '' a remainder when a numeral of a call code (12 digits) is divided by 24'' is set for the communication time, then the time synchronization matching communication time is set at random for each radio equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic meter-reading system for collecting data such as the amount of gas, water, electricity, etc. used from a terminal device to a center device by using a telephone line, and more specifically, to a terminal. The present invention relates to a wireless system for automatic meter reading, which is partially wireless so that devices can be connected via a wireless line.

[0002]

2. Description of the Related Art A wireless system for automatic meter reading of this type calls a terminal network control device from a center device through a telephone line in a no-ringing communication system, and further, the terminal network control device calls a terminal device through a wireless line. And collects data from the terminal device to the center device via a reverse route, or calls the terminal network control device from the terminal device via a wireless line in response to a call request from the terminal device, The terminal network control device calls the center device via a telephone line and collects data from the terminal device in the center device.

In such a wireless system for automatic meter reading,
A wireless device is connected to each of the terminal device and the terminal network control device, so that the terminal device and the terminal network control device communicate with each other via a wireless line using each wireless device. More specifically, a master unit of a wireless device that is a wireless device for network control (hereinafter referred to as a master wireless device) is connected to a network control device for a terminal connected to a telephone line,
In addition, a slave unit (hereinafter referred to as a slave wireless device) of a wireless device, which is a wireless device for a terminal, is connected to the terminal device, and the terminal network control device and the terminal device are wirelessly connected via a master wireless device and a slave wireless device, respectively. Communicate.

As described above, in the automatic meter-reading wireless system using the wireless line, it is difficult to use a commercial power supply of 100 V AC as an operating power supply for the parent wireless device and the child wireless device due to the installation conditions, etc. Is a requirement.

As described above, as a communication method of the automatic meter reading wireless system using the battery-powered master wireless device and the slave wireless device, both the master wireless device and the slave wireless device are used in order to reduce battery consumption as much as possible. Built-in clock synchronized with
Only when the predetermined wireless communication time has come, the wireless device is activated to perform wireless communication between both wireless devices, thereby reducing battery consumption.

[0006] In such a method, it is premised that the clocks built in the master radio device and the clocks built in the slave radio device are completely the same when performing wireless communication, but the clocks are independent. Therefore, since a time lag occurs when it is used for a long time, a means for correcting this time lag is required. As a method of correcting such a time lag, for example, a method of performing wireless communication for clock synchronization between the parent wireless device and the child wireless device at a rate of about once a day has been conventionally considered.

Such clock synchronization communication between the master radio device and the slave radio device is indispensable for battery-powered radio communication, and if the clock synchronization cannot be achieved, the time lag increases. However, there is a possibility that wireless communication will be disabled. Therefore, it is a key point of the wireless system for automatic meter reading to reliably perform this clock synchronization communication.

By the way, the radio used in the radio system for automatic meter reading uses a specific low power radio having a relatively large transmission output (transmission output 10 mW or less), but the radio reachable distance is about 100 even in a general urban area. Gas meter wireless device for wireless system for automatic meter reading,
When installed in a general home for meter reading of water, electricity, etc., there may be a plurality of wireless devices within the wireless coverage area.

[0009]

As described above, when clock synchronization communication is performed between the parent wireless device and the child wireless device at a rate of, for example, about once a day, a plurality of wireless devices are within the wireless coverage area. When the device exists, there is a problem in that wireless communication of other systems may collide with each other, and it may not be possible to accurately perform clock synchronization between the parent wireless device and the child wireless device.

The present invention has been made in view of the above,
The purpose is that even if there are multiple wireless devices within the wireless coverage area, there is no interference with other systems, and reliable clock synchronization communication can be performed, which in turn ensures wireless communication. An object of the present invention is to provide a wireless system for automatic meter reading.

Another object of the present invention is to provide an automatic meter-reading wireless system capable of easily synchronizing the clocks of a parent wireless device and a child wireless device when the wireless device is installed.

Still another object of the present invention is to provide an automatic meter reading wireless system capable of appropriately correcting a slight time lag occurring between clocks of a parent wireless device and a slave wireless device.

[0013]

In order to achieve the above object, an automatic meter reading wireless system of the present invention connects a center device to a terminal network control device via a telephone line, and connects the terminal network control device to the terminal network control device. The network control radio equipment and the terminal radio are called while the connected network control radio equipment calls the terminal equipment via the terminal radio equipment connected to the terminal equipment and collects data from the terminal equipment to the center equipment. A wireless system for automatic meter reading, which is built in each device and performs wireless communication for data collection at a predetermined time based on the time of clock circuits synchronized with each other and synchronized wireless communication of the clock circuits, the network control The wireless device for a terminal and the wireless device for a terminal respectively include a communication channel for performing the wireless communication and a clock circuit for performing the wireless communication based on the data of the call code individually set. And summarized in that comprises means for setting the communication time for performing period adjustment.

In the automatic meter reading wireless system of the present invention, the center device is connected to the terminal network control device via a telephone line, and the network control wireless device connected to the terminal network control device is connected to the terminal device. The terminal device is called up via the terminal wireless device connected to the terminal device, the data is collected from the terminal device to the center device, and the network control wireless device and the terminal wireless device each have a built-in clock circuit synchronized with each other. Is a wireless system for automatic meter reading that performs wireless communication for data collection and synchronized wireless communication for synchronizing the clock circuit at a predetermined time based on the time of, and storage means for storing the clock synchronized communication time for each customer. And setting means for setting the clock synchronization communication time for each customer stored in the storage means to the wireless device of the customer, and the clock synchronization set by the setting means. Becomes a signal time, and summarized in that and a radio communication execution means combined clock synchronization for implementing the wireless communication combined clock synchronization between the network control wireless device and the terminal for the wireless device.

Further, in the automatic meter reading radio system of the present invention, the center device is connected to the terminal network control device via the telephone line, and the network control radio device connected to the terminal network control device is connected to the terminal device. The terminal device is called up via the terminal wireless device connected to the terminal device, the data is collected from the terminal device to the center device, and the network control wireless device and the terminal wireless device each have a built-in clock circuit synchronized with each other. A wireless system for automatic meter reading, which performs wireless communication for data collection and wireless communication for synchronizing the clock circuit at a predetermined time based on the time Storage means for storing the time when the meter-reading request is received by the no-ringing communication as the clock synchronization communication time, and the clock synchronization communication stored in the storage means Becomes a time, and summarized in that and a radio communication execution means combined clock synchronization for implementing the wireless communication combined clock synchronization between the network control wireless device and the terminal for the wireless device.

Furthermore, in the automatic meter reading radio system of the present invention, the center device is connected to the terminal network control device via the telephone line, and the network control radio device connected to the terminal network control device is connected to the terminal. The terminal device is called via the terminal wireless device connected to the device, the data is collected from the terminal device to the center device, and the clocks are respectively incorporated in the network control wireless device and the terminal wireless device and synchronized with each other. A wireless system for automatic meter reading, which performs wireless communication for data collection and synchronized wireless communication for synchronizing the clock circuit at a predetermined time based on the time of the circuit, wherein the network control wireless device uses a centering device to perform no ringing communication. Storage means for storing the meter reading and calling date and time data transmitted at the time of the meter reading request as the clock synchronization communication time, and the clock synchronization data stored in the storage means. Becomes a communication time, it is summarized in that and a radio communication execution means combined clock synchronization for implementing the wireless communication combined clock synchronization between the network control wireless device and the terminal for the wireless device.

In the automatic meter reading radio system of the present invention, the center device is connected to the terminal network control device via a telephone line, and the network control radio device connected to the terminal network control device is connected to the terminal device. The terminal device is called via the specified terminal wireless device, the data is collected from the terminal device to the center device, and the time of the clock circuits which are built in the network control wireless device and the terminal wireless device respectively and are synchronized with each other. A wireless system for automatic meter reading that performs wireless communication for data collection and synchronized wireless communication of the clock circuit at a predetermined time based on the above, wherein the network control wireless device is a test communication request from a master setter. In response, the transmission data with the information for identifying the number of transmissions is continuously transmitted, and the wireless device for the terminal responds to the test communication request from the setting device for the slave unit and transmits it. The carrier sense operation for detecting the carrier is started, the transmission data from the network control wireless device is received, the final transmission data is identified from the transmission count information included in the received transmission data, and the final transmission data is detected. The gist of the present invention is to have a means for returning a response after a predetermined time after the reception, setting the response completion time point as the start time point of the time interval until the next wireless communication, and thereby performing clock synchronization when the wireless device is installed.

Further, in the automatic meter reading radio system of the present invention, the center device is connected to the terminal network control device via a telephone line, and the network control radio device connected to the terminal network control device is connected to the terminal device. The terminal device is called up via the terminal wireless device connected to the terminal device, the data is collected from the terminal device to the center device, and the network control wireless device and the terminal wireless device each have a built-in clock circuit synchronized with each other. A wireless system for automatic meter reading, which performs wireless communication for data collection and synchronized wireless communication for synchronizing the clock circuit at a predetermined time based on the time, and the wireless device for network control is a test from the setter for the master unit. In response to the communication request, the transmission data with the information for identifying the number of transmissions is continuously transmitted, and the terminal wireless device responds to the test communication request from the slave setter. , Starts the carrier sense operation for detecting the transmission carrier, receives the transmission data from the network control wireless device, and transmits the final data from the partner wireless device based on the transmission count information included in the received transmission data. Time is calculated, and a response is returned after a specified time from the end time of the last transmission data transmission, and the completion time of this response is set as the start time point of the time interval until the next wireless communication. The gist of the present invention is to have a means for performing clock synchronization.

Further, in the automatic meter reading radio system of the present invention, the center device is connected to the terminal network control device via a telephone line, and the network control radio device connected to the terminal network control device is connected to the terminal device. The terminal device is called up via the terminal wireless device connected to the terminal device, the data is collected from the terminal device to the center device, and the network control wireless device and the terminal wireless device each have a built-in clock circuit synchronized with each other. A wireless system for automatic meter reading, which performs wireless communication for data collection and wireless communication for synchronizing the clock circuit at a predetermined time based on the time, and the wireless device for network control identifies the number of transmissions. Has a means for transmitting the transmission data added, the terminal wireless device starts a carrier sense operation for detecting a transmission carrier from the network control wireless device, The transmission data from the control wireless device is received, the final transmission data is identified from the transmission count information included in the received transmission data, the time from the start of reception to the completion of reception of the final transmission data is measured, and the measured time The gist is to have a means for correcting the time from to the next wireless communication.

Further, in the automatic meter reading radio system of the present invention, the center device is connected to the terminal network control device via a telephone line, and the network control radio device connected to the terminal network control device is connected to the terminal. The terminal device is called via the terminal wireless device connected to the device, the data is collected from the terminal device to the center device, and the clocks are respectively incorporated in the network control wireless device and the terminal wireless device and synchronized with each other. A wireless system for automatic meter reading, which performs wireless communication for data collection and synchronized wireless communication of the clock circuit at a predetermined time based on the time of the circuit, wherein the network control wireless device identifies the number of transmissions. The terminal wireless device starts a carrier sense operation for detecting a transmission carrier from the network controlling wireless device, which has means for transmitting the transmission data to which the information is added. At the same time as receiving the transmission data from the network control wireless device, measuring the time from the reception start to the reception completion, and the time from the transmission count information included in the received transmission data until the final transmission data is transmitted. It is a gist to have a means for calculating and calculating the time from the calculated time until the next wireless communication is performed.

[0021]

In the wireless system for automatic meter reading according to the present invention, the network control wireless device and the terminal wireless device are provided with a communication channel and a clock circuit for performing wireless communication based on the data of the call code set individually. Set the communication time for synchronization.

Further, in the wireless system for automatic meter reading of the present invention, the clock synchronization communication time for each customer is stored, the clock synchronization communication time for each customer is set in the customer's wireless device, and this setting is made. When the clock synchronization communication time is reached, clock synchronization wireless communication is carried out between the network control wireless device and the terminal wireless device.

Further, in the automatic meter reading wireless system of the present invention, the network controlling wireless device stores the time when the meter reading request is received from the center device by the no ringing communication which is regularly performed as the clock synchronization communication time, and this memory is stored. When the clock synchronization communication time comes, the clock synchronization wireless communication is performed between the network control wireless device and the terminal wireless device.

Furthermore, in the automatic meter reading wireless system of the present invention, the network controlling wireless device stores the meter reading and calling date and time data transmitted at the time of the meter reading request by the no ringing communication as the clock synchronization communication time. When the stored clock synchronization communication time comes, clock synchronization wireless communication is performed between the network control wireless device and the terminal wireless device.

In the automatic meter reading wireless system of the present invention, the network control wireless device responds to the test communication request from the master setter and continuously transmits the transmission data to which the information for identifying the number of transmissions is added. In response to the test communication request from the slave setter, the terminal wireless device starts a carrier sense operation for detecting the transmission carrier and receives the transmission data from the network control wireless device. Then, the final transmission data is identified from the transmission count information included in the received transmission data, the response is returned after a predetermined time has elapsed after the final transmission data is received, and the response completion time point starts the time interval until the next wireless communication. At this time, clock synchronization is performed when the wireless device is installed.

Further, in the automatic meter reading wireless system of the present invention, the network controlling wireless device responds to the test communication request from the master setter and transmits the transmission data to which the information for identifying the number of transmissions is added. Continuously transmitting, the terminal wireless device responds to a test communication request from the slave setting device, starts a carrier sense operation for detecting a transmission carrier,
Receive the transmission data from the network control wireless device, calculate the time until the final data is transmitted from the partner wireless device from the transmission count information including the received transmission data,
A response is returned after a predetermined time from the final transmission data transmission end time, and the response completion time point is set as the start time point of the time interval until the next wireless communication, whereby the clock synchronization at the time of installing the wireless device is performed.

Further, in the automatic meter-reading wireless system of the present invention, the network control wireless device has means for transmitting transmission data to which information for identifying the number of transmissions is added, and the terminal wireless device is for network control. The carrier sense operation for detecting the transmission carrier from the wireless device is started, the transmission data from the network control wireless device is received, and the final transmission data is identified from the transmission count information included in the received transmission data. The time from the start of reception to the completion of reception of the final transmission data is measured, and the time from the measured time to the next wireless communication is corrected.

Further, in the automatic meter reading wireless system of the present invention, the network controlling wireless device has means for transmitting the transmission data to which the information for identifying the number of transmissions is added, and the terminal wireless device controls the network controlling. The carrier sense operation for detecting the transmission carrier from the radio device for reception is started, and the transmission data from the radio device for network control is received, and at the same time, the time from the start of reception to the completion of reception is measured and the reception is performed. The time until the final transmission data is transmitted is calculated from the transmission count information included in the transmission data, and the time from the calculated time to the next wireless communication is corrected.

[0029]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the overall configuration of a wireless system for automatic meter reading according to the first embodiment of the present invention. The wireless system for automatic meter reading shown in FIG. 1 is installed in a general household, for example, and collects meter reading data from a meter 29, which is a terminal device for metering the usage of gas, water, electricity, etc., in the center device 21. Yes, the meter 29 is connected to the slave wireless device 28, is connected from the slave wireless device 28 to the master wireless device 27 via a wireless line, and connects the master wireless device 27 to the terminal network controller (T-NCU) 26. It is connected to the exchange 24 via. The center device 21 is connected to the exchange 24 via a center network control unit (C-NCU) 22 or an automatic incoming call network control unit (MA-NCU) 23. No ringing trunk 2 in the exchange 24
5 is connected.

Further, the center device 21 includes a storage device 10
The storage device 10 stores a clock synchronization communication time setting file 211 for each customer, a meter reading date / time setting file 212 by no ringing communication for each customer, and a meter reading / calling date / time setting file 213 for each customer. I'm supposed to get it.

In the thus constructed device, when the center device 21 wants to collect meter reading data from the meter 29, the center device 21 sends the data through the center network control device 22, the exchange 24, and the no ringing trunk 25. When no ringing arrives at the terminal network control device 26 and the terminal network control device 26 requests meter reading data to the parent wireless device 27, the parent wireless device 27 sends meter reading data to the meter 29 via the child wireless device 28. A request is made, and as a result, the meter reading data from the meter 29 is routed in the opposite direction to the center device 21.
Will be collected in.

In the case of collecting data or transmitting information to the center device 21 by calling the terminal from the meter 29, when the meter 29 makes a call request to the child wireless device 28, the child wireless device 28 sends a call to the parent device. The wireless device 27 is called, and the master wireless device 27 causes the terminal network control device 26, the exchange 24,
The center device 21 receives a call through the automatic incoming call network control device 23, whereby the meter reading data or information from the meter 29 can be transmitted to the center device 21.

FIG. 2 is a block diagram showing a detailed internal structure of the parent wireless device 27 and the child wireless device 28 shown in FIG. The parent wireless device 27 and the child wireless device 28 are shown in FIG.
It has the same circuit configuration as shown in FIG.

As shown in FIG. 2, the parent wireless device 27 and the child wireless device 28 have an antenna 11 for a wireless device, and the antenna 11 passes through a wireless section (RF) circuit 12 and a modulation / demodulation circuit (modem). It is connected to 13. Modulation / demodulation circuit 13
Is supplied with transmission data from the CPU 14 and also supplied with reception data to the CPU 14. Further, a clock circuit 17, a clock synchronization communication time / communication channel setting circuit 18, a call code setting circuit 19 and an interface circuit 20 are connected to the CPU 14. Further, the battery 16 which is the operating power source of the wireless device is directly connected to the CPU 14, but is connected to the wireless circuit 12 and the modulation / demodulation circuit 13 via the power switch 15, whereby the wireless circuit 12 and the modulation / demodulation circuit are connected. The supply of the operating voltage from the battery 16 to the circuit 13 is controlled by the CPU 14.

The radio section circuit 12 is, for example, 400 MH.
This is a circuit for performing FM modulation / demodulation and the like in the z radio frequency band.
The modulation / demodulation circuit 13 modulates a digital signal from the CPU 14 into an analog signal in a voice band (300 Hz to 3.4 kHz band) such as a binary FSK signal or an MSK signal, or vice versa.

The clock circuit 17 is a circuit for managing the time of the wireless device. For example, the clock circuit 17 has a time period for carrying out a carrier sensing operation for periodically detecting whether or not there is a transmission from the partner wireless device ( Cycle), and in the case of the parent wireless device 27, clock synchronization communication time / communication channel setting circuit 1
The clock synchronization communication time of 8 is set, and at this communication time, the clock circuit 17 outputs an activation signal to the CPU 14.

The clock synchronization communication time / communication channel setting circuit 18 is a circuit for setting the clock synchronization communication time and a communication channel for performing the clock synchronization communication. The call code setting circuit 19 is a circuit for setting the identification code of the wireless device. In addition, when the radio of the low power security standard (RCR STD-30) is used, it is necessary to preset the ID number, which is a 12-digit number given by the RCR (Radio System Development Center), for each radio device. is there.

The interface circuit 20 is used for the master wireless device 2
In the case of No. 7, it is an interface circuit for connecting to the terminal network controller 26, and in the case of the slave radio apparatus 28, it is an interface circuit for connecting to the meter 29. The level conversion of the data signal from 29 is performed.

Further, the CPU 14 has a function of always stopping its operation and starting the operation by a start signal from the clock circuit 17, and also from the meter 29 or the terminal network controller 26 via the interface circuit 20. It has a function of starting operation when receiving a message.

Next, the operation of the first embodiment configured as described above will be described with reference to the operation explanatory view of FIG.

In a device utilizing radio, it is legally obligatory to give each call code to the radio device. For example, when a radio of “low power security standard (RCR STD-30)” is used in the radio system for automatic meter reading, a 12-digit number is set as a calling code.

Therefore, in the first embodiment, the parent wireless device 2
This call code is used in order to disperse the communication channel and the clock synchronization communication time in the wireless communication performed between the wireless communication device 7 and the slave wireless device 28 and to avoid interference with the wireless communication of other systems.

That is, as the clock synchronization communication time, for example, when the communication time is distributed every 24 hours (every hour), as shown in FIG. 3, "the number of the calling code (12 digits) is divided by 24". The communication time is set to "communication time (remainder)", and thereby the clock synchronization communication time is set randomly for each wireless device.

As the communication channel, the "remainder (surplus) when the number of the calling code (12 digits) is divided by the number of communication channels n" is set to the communication channel. For example, when the radio of the low power security standard (RCR STD-30) is used, there are 48 communication channels that can be used. Therefore, as shown in FIG.
The remainder (surplus) obtained by dividing a two-digit number by 48 "is set as the communication channel, whereby the communication channel is randomly set for each wireless device.

Then, using the communication channel and the clock-synchronized communication time set in this way, clock-synchronized communication is performed as shown in FIG. 3, whereby a plurality of wireless devices are within the same wireless coverage area. Even if it exists
It is possible to communicate without interfering with each other.

Next, referring to the operation explanatory view shown in FIG.
A second embodiment of the present invention will be described.

The wireless system for automatic meter reading, the parent wireless device 27 and the child wireless device 28 according to the second embodiment.
The circuit configurations of both wireless devices are the same as those shown in FIGS. 1 and 2, respectively.

In the embodiment shown in FIG. 4, the clock synchronization communication time setting file 211 for each consumer stored in the storage device 10 connected to the center device 21 as shown in FIG. The clock synchronization communication time, which is stored in the file 211 and is different for each customer, is set in the parent wireless device 27 installed in the customer. That is, the center device 21 receives an incoming call to the parent wireless device 27 via the terminal network control device 26 of the consumer by no ringing communication, whereby the parent wireless device 27 sets the time in the clock synchronization communication time setting file 211. Set the synchronization communication time. Then, the parent wireless device 2
7 calls the slave radio apparatus 28 at the set clock synchronization communication time and performs clock synchronization communication, thereby matching the times of the clock circuits 17 of both the master radio apparatus 27 and the slave radio apparatus 28. Is.

That is, as shown in FIG. 4, the center device 21 activates the center network control device 22 to make a clock synchronization communication time and communication channel setting request, and the center network control device 22 switches from the center network control device 22 to the exchange 24. No ringing is received by the terminal network control device 26 via the no ringing trunk 25, and a meter activation request is issued to the terminal network control device 26. Then, when the terminal network controller 26 further requests the master wireless device 27 to activate, the master wireless device 27 returns a pseudo meter reading response to the center network controller 22,
The center network control device 22 transmits the clock synchronization communication time (for example, y hour) setting data stored in the clock synchronization communication time setting file 211 for each customer to the parent wireless device 27. As a result, the parent wireless device 27 receives the clock synchronization communication time setting data and returns a response signal to the center network control device 22, whereby the center network control device 22 ends the communication.

As a result, since the clock synchronization communication time which is different for each consumer is set in the parent wireless device 27,
When the set clock synchronization communication time comes, the parent wireless device 27 calls the child wireless device 28 to perform the clock synchronization communication, whereby the parent wireless device 27
And the time of each clock circuit 17 of the slave wireless device 28 is perfectly synchronized and becomes a coincident time.

Since the clock synchronization communication time stored in the clock synchronization communication time setting file 211 for each customer is different for each customer, a plurality of wireless devices exist in the same wireless coverage area. Even in such cases, communication can be performed without mutual interference.

Next, referring to the operation explanatory view shown in FIG.
A third embodiment of the present invention will be described.

The automatic meter reading wireless system, the parent wireless device 27 and the child wireless device 28 according to the third embodiment.
The circuit configurations of both wireless devices are the same as those shown in FIGS. 1 and 2, respectively.

In the embodiment shown in FIG. 5, the clock synchronization communication time setting file 211 for each customer stored in the storage device 10 connected to the center device 21 as shown in FIG. As in the case of the second embodiment, the clock synchronization communication time different for each customer stored in the file 211 is set in the parent wireless device 27 installed in the customer. In the second embodiment, the center device 21 accesses the parent wireless device 27 by no ringing communication, so that the clock synchronization communication time stored in the clock synchronization communication time setting file 211 for each customer is transmitted to the parent wireless device 27. While the wireless device 27 is set, in the third embodiment, the parent wireless device 2
7 makes a test call request, calls the center device 21 from the parent wireless device 27 through the terminal network control device 26, the exchange 24, and the automatic incoming call network control device 23, thereby connecting to the center device 21. In addition, the clock synchronization communication time setting data is read from the clock synchronization communication time setting file 211 for each consumer, and the read clock synchronization communication time setting data is transmitted to the parent wireless device 27 for setting. It is different.

That is, as shown in FIG. 5, the parent wireless device 27 makes a test call request to the terminal network control device 26, whereby the terminal network control device 26 is switched to the exchange 24, the automatic termination network control device. When an incoming call arrives at the center apparatus 21 via 23, the center apparatus 21 sends the clock synchronization communication time setting data (for example, y hour) stored in the clock synchronization communication time setting file 211 for each consumer to the parent wireless device 27.
Send to. As a result, the parent wireless device 27 receives the clock synchronization communication time setting data and returns a response signal to the center network control device 22, whereby the center network control device 22 ends the communication.

As a result, since the clock synchronization communication time different for each consumer is set in the parent wireless device 27,
When the set clock synchronization communication time comes, the parent wireless device 27 calls the child wireless device 28 to perform the clock synchronization communication, whereby the parent wireless device 27
And the time of each clock circuit 17 of the slave wireless device 28 is perfectly synchronized and becomes a coincident time.

Since the clock synchronization communication time stored in the clock synchronization communication time setting file 211 for each customer is different for each customer, a plurality of wireless devices exist in the same wireless arrival area. Even in such cases, communication can be performed without mutual interference.

Next, with reference to the operation explanatory view shown in FIG.
A fourth embodiment of the present invention will be described.

The automatic meter-reading wireless system and the parent wireless device 27 and the child wireless device 28 according to the fourth embodiment.
The circuit configurations of both wireless devices are the same as those shown in FIGS. 1 and 2, respectively.

In the embodiment shown in FIG. 6, the meter reading date / time setting file 212 by no ringing communication for each customer stored in the storage device 10 connected to the center device 21 as shown in FIG. The master wireless device 27 installed in the customer is set as the clock synchronization communication time based on the collection date and time of the meter reading data performed by the center device 21 at the meter reading date and time by the no ringing communication which is stored in the file 212 and is different for each customer. To be set to.

That is, in the collection processing of the meter reading data by the center device 21 to each customer by the no ringing communication, a telephone by the no ringing communication is made from the center device 21 to each customer where each meter 29 is installed. Since the meter reading data is collected over time, the no-ringing communication time naturally becomes a different time.
Therefore, by storing the time when the meter reading data by this no-ringing communication is stored in the parent wireless device 27 and using this time as the clock synchronization communication time, the clock synchronization communication time is dispersed, and thereby the same wireless arrival is achieved. Even when a plurality of wireless devices exist in the area, communication can be performed without mutual interference.

That is, in FIG. 6, when the center device 21 makes a meter reading request to the center network control device 22 by no ringing communication, the center network control device 22 sends the terminal data through the exchange 24 and the no ringing trunk 25. Since no ringing arrives at the network control device 26 and the master radio device 27 is activated from the terminal network control device 26, the master radio device 27 indicates the time when the meter reading by the no ringing communication from the center device 21 is performed. It is stored as the clock synchronization communication time. Then, thereafter, clock synchronization communication is performed between the parent wireless device 27 and the child wireless device 28 at the stored clock synchronization communication time, whereby each clock circuit 1 of the parent wireless device 27 and the child wireless device 28 is performed.
The time of 7 is a time that is completely synchronized and coincides.

Next, referring to the operation explanatory view shown in FIG.
A fifth embodiment of the present invention will be described.

The automatic meter reading wireless system, the parent wireless device 27 and the child wireless device 28 according to the fifth embodiment.
The circuit configurations of both wireless devices are the same as those shown in FIGS. 1 and 2, respectively.

In the embodiment shown in FIG. 7, a meter reading / calling date and time setting file 213 for each customer stored in the storage device 10 connected to the center device 21 as shown in FIG.
The meter reading / calling date and time set for each customer is used as the clock synchronized communication time.

More specifically, in the automatic meter reading wireless system, in order to reliably perform meter reading, when the meter reading is performed by no ringing communication, the next time set in the meter reading / calling date / time setting file 213 for each customer. (Next month) The meter reading and calling date and time is set in the meter 29, and the function of transmitting terminal reading data to the center device 21 by performing terminal calling communication from the meter 29 according to the set meter reading and calling date and time is the meter reading by no ringing communication. Used in conjunction with data collection. Therefore, the parent wireless device 27 uses the meter-reading calling date and time data transmitted from the center device as the clock synchronization communication time.

That is, when the no-ringing communication is performed, the meter-reading call date and time is updated, and therefore the meter-reading call is not issued for the current month, but if the no-ringing communication meter-reading is performed, the meter-reading is performed because the customer is on the phone. If is not performed, the meter reading can be performed by the terminal calling communication.

In FIG. 7, the center device 21 first activates the center network control device 22 to perform the meter reading at the meter reading date and time by the no ringing communication stored in the meter reading date and time setting file 212 by the no ringing communication for each customer. The center network control device 22 receives a non-ringing call to the terminal network control device 26 via the exchange 24 and the no ringing trunk 25, and the terminal network control device 26 requests activation of the parent wireless device 27. When the parent wireless device 27 returns the pseudo meter reading response to the center network control device 22, the center network control device 22 sends the meter reading and calling date and time setting data stored in the meter reading and calling date and time setting file 213 for each customer. Since the data is transmitted to the wireless device 27, the parent wireless device 27 stores the meter-reading / calling date / time setting data as the clock synchronization communication time. After that, the stored clock synchronization communication time is used to perform the clock synchronization communication between the parent wireless device 27 and the child wireless device 28.

Next, a wireless system for automatic meter reading according to the sixth embodiment of the present invention will be described with reference to FIG.

As described above, the automatic meter-reading wireless system is premised on the fact that the clock circuits incorporated in the master wireless device 27 and the slave wireless device 28 are synchronized with each other. From the shipment to the installation at the customer, the parent wireless device 27 and the child wireless device 28
Since wireless communication is not performed between the parent wireless device 27 and the child wireless device 28, the clock circuits incorporated in the parent wireless device 27 and the child wireless device 28 are not synchronized with each other. If the wireless devices are not synchronized with each other, wireless communication cannot be performed between the wireless devices, as described above. Therefore, when the wireless devices are installed, the clock circuits of the parent wireless device 27 and the child wireless device 28 respectively are installed. Need to be in sync. Therefore, in the sixth embodiment, when the wireless devices are installed in customers, the clock circuits built in both wireless devices are synchronized with each other.

FIG. 8 is a block diagram showing the overall configuration of the automatic meter reading wireless system according to the sixth embodiment.
The wireless system for automatic meter reading shown in the same figure removes the storage device 10 from the wireless system for automatic meter reading shown in FIG. 1, and sets the master wireless device 27 and the slave wireless device 28 to the master unit setting device 30 and the slave unit, respectively. The configuration and operation are the same as those in FIG. 1, and the same components are designated by the same reference numerals.

FIG. 9 is a block diagram showing the configurations of the parent wireless device 27 and the child wireless device 28 used in the automatic meter reading wireless system of FIG. The parent wireless device 27 and the child wireless device 28 shown in the figure are different only in that the clock synchronization communication time / communication channel setting circuit 18 and the call code setting circuit 19 are removed from the wireless device shown in FIG.

The parent device setting device 30 and the child device setting device 31 shown in FIG. 8 are the interface circuits 20 of the parent wireless device 27 and the child wireless device 28 shown in FIG. 9, respectively.
And a test communication request command is sent to each of the CPU 1 through the interface circuit 20.
4 to supply. Then, the parent wireless device 2
When receiving the test communication command from the master setter 30, the device 7 starts test transmission and further adds information for identifying the number of transmissions to the test transmission data. When the slave wireless device 28 receives the test communication command from the slave setter 31, the slave wireless device 28 starts the carrier sense operation, receives the test transmission from the master wireless device 27, and further transmits the transmission count information in the reception data. The last transmission time is detected from and the response after this is returned. Then, the time point at which the response is returned is set as the time counting start time point until the next wireless communication, so that the parent wireless device 27 and the child wireless device 28 are synchronized with each other.

FIG. 10 is an explanatory view of the transmission time on the transmission side and the carrier sense timing on the reception side in the sixth embodiment.

In the automatic meter reading radio system, when a specific low power radio (transmission output of 10 mW or less) that does not require a radio station license is used as the type of radio, the transmission time T ₁ and the transmission suspension time T of the radio device are legally regulated. ₂ has a time limit. For example, low power security standard (R
In the case of CR STD-30), the transmission time T ₁ is 3 seconds or less, and the transmission pause time T ₂ is 2 seconds or more.

Therefore, as shown in FIG. 10, when the transmission side continuously repeats transmission → pause → transmission ... Under the precondition that pause time T ₂ <transmission time T ₁ , carrier sense on the reception side is performed. When the cycle T ₃ is set as follows, the carrier to be sensed twice allows the receiving side to detect the transmission carrier.

Pause time T ₂ <Carrier sense cycle T ₃ <Transmission time T ₁ Next, referring to the operation explanatory diagram shown in FIG. 11 and the transmission message format of the parent wireless device shown in FIG. 12, a sixth embodiment will be described. The operation of transmitting a test communication request command from the master setter 30 to the master wireless device 27 will be described.

First, when the master setter 30 transmits a test communication request command, the command is supplied to the CPU 14 via the interface circuit 20 of the master wireless device 27 to activate the CPU 14 and have the format shown in FIG. The test transmission data is transmitted a predetermined number of times (n times in this embodiment).

Of the test transmission data shown in FIG. 12, the bit sync signal, frame sync signal, and paging signal are those legally defined when the specific low power radio is used, and the subsequent parts are the following. This is a portion that can be freely set by the user side, and in addition to data to be wirelessly transmitted, transmission count information, test transmission data, etc. are set in this portion.

As described above, after the master wireless device 27 has transmitted the test transmission data a predetermined number of times (n times), it waits for a response from the slave wireless device 28. If there is no response from the slave radio device 28, the above-described test transmission operation is repeated again.

Next, from the slave setter 31 to the slave wireless device 2
8 to send a test communication request command. This test communication request command is sent from the slave setter 31 to the slave wireless device 2
8 is supplied to the CPU 14 of the slave wireless device 28 via the interface circuit 20 of FIG.
The PU 14 is activated, the carrier sense operation is started, and the slave wireless device 28 receives the test transmission data from the master wireless device 27.

When the slave wireless device 28 receives the test transmission data from the master wireless device 27, the slave wireless device 28 identifies the transmission count information in the test transmission data, and the final transmission data (transmission message n in this embodiment) is thereby identified. ) Is received, a transmission pause time T ₂ is waited for, and then a response is transmitted.

After the completion of the response transmission, the counting of the time until the next wireless communication with the parent wireless device 27 is started, and the test communication response response is sent to the slave setter 31, and a series of The test communication operation is ended, and the CPU 14 also stops operating.

Also, the master wireless device 27 starts counting the time until the next wireless communication with the slave wireless device 28 is performed after the completion of the response reception, and the master unit setting device 3
A test communication response response is sent to 0, the series of test communication operations are ended, and the CPU 14 also stops operating.

As described above, the end point of the test communication becomes the start point of time counting until the next wireless communication of the parent wireless device 27 and the child wireless device 28, and the two can be synchronized with each other.

Next, the operation of the seventh embodiment will be described with reference to the operation explanatory view shown in FIG.

The circuit configurations of the automatic meter reading wireless system and the wireless devices of the parent wireless device 27 and the child wireless device 28 in the seventh embodiment are the same as those shown in FIGS. 8 and 9, respectively.

In addition, the seventh embodiment is based on the parent wireless device 2
Although the test communication operation and the wireless transmission message in 7 are the same as those in the sixth embodiment described above, only the method of determining the test reception completion time on the receiving side is different.

That is, in the case of the above-described sixth embodiment, reception is performed up to the final message (transmission message (n)), but in the seventh embodiment, the normal message is received to the final message (transmission). The only difference is that the reception time T ₄ up to the message (n) is obtained from the calculation of the following equation.

[0091]

[Number 1] T ₄ = (number of times of transmission of n- normal reception _{message) (T 1 + T 2)} × Accordingly, in this seventh embodiment, if the final message (send message (n)) is normally in the radio communication Even if it cannot be received, the response transmission can be performed from the child radio device 28.

In the sixth and seventh embodiments described above, a dedicated master unit setting device 30 and a slave unit setting device 31 are provided, whereby a test communication request command is sent and a test communication response response is received. However, since the communication operation by this setting device is performed via the interface circuit 20 of the wireless device, even if the meter 29 is provided with the same function as that of the slave device setting device 31, the same operation is performed. It can be carried out. Further, the same effect is obtained by providing the center device with the same function as that of the parent device setting device 30 so that the message sent from the terminal network control device 26 by the no ringing communication from the center device becomes a test communication request. be able to.

Next, the eighth embodiment will be described with reference to FIGS.

As described above, the wireless system for automatic meter reading is based on the premise that the clock circuits incorporated in the parent wireless device 27 and the child wireless device 28 are synchronized, but in reality, the wireless device is A slight time lag occurs between the clocks of the parent wireless device and the child wireless device due to the influence of the installed temperature environment and the like. Therefore, in this embodiment, a means for correcting this time shift will be described.

The basic idea in this embodiment is that, first, the transmission data is transmitted from the parent wireless device, which is the side that starts the wireless communication, a plurality of times, and the transmission number information for identifying the transmission number is added to the transmission data. . Then, the slave wireless device, which is the side receiving the wireless communication, measures the time until the transmitting side completes the transmission from the transmission count information in the received data, and corrects the time until the next wireless communication from this measurement result. Is.

The overall structure of the automatic meter-reading wireless system in the eighth embodiment is the same as that shown in FIG. 1, and the parent wireless device 27 and the child wireless device used in the automatic meter-reading wireless system. The structure of 28 is the same as that shown in FIG.

The transmission time on the transmission side and the carrier sense timing on the reception side in this embodiment are the same as those shown in FIG. That is, as shown in FIG.
When the transmission side continuously repeats transmission → pause → transmission ... If carrier sense cycle T ₃ on the reception side is set as follows under the precondition that pause time T ₂ <transmission time T ₁ , By performing the sensing twice, the transmitting side can be detected on the receiving side.

Pause time T ₂ <Carrier sense cycle T ₃ <Transmission time T ₁ FIG. 14 shows the relationship between the clock error and the transmission time of the clock built into the wireless device in this embodiment and the concept of the clock synchronization method. It is an explanatory view shown.

As shown in FIG. 14, assuming that the clock in the wireless device causes an error of ± ΔT during the wireless communication cycle T (see FIG. 15), for example, even if the worst combination of the clock errors occurs, the transmission side can It can be seen that reception is possible if transmission is performed within ± 2ΔT before and after the transmission time. In addition, the correction of the clock cycle on the transmitting side and the receiving side should be performed within ± 2 of the transmission time beforehand on the receiving side.
With setting the information of the [Delta] T, by measuring the time T _a of the receiving side from the "start of reception to the reception completion,
The correction time is calculated by the following formula, and the synchronous correction can be performed with this correction time.

Correction time = T _a -2ΔT Next, the operation of the eighth embodiment will be described with reference to the operation explanatory view shown in FIG.

In the present embodiment, for example, as shown in FIG. 16, a two-way transmission such that the parent wireless device 27 transmits to the child wireless device 28 and then the child wireless device 28 returns a response. Consider the communication procedure. In addition, the wireless transmission message from the parent wireless device 27 in this case is as shown in FIG.
It has the same format as shown in.

FIG. 15 shows the operation of measuring the "time T _a from the start of reception to the completion of reception" in the slave radio apparatus 28 on the receiving side, as described above.

As shown in FIG. 15, while the master wireless device 27 starts transmitting, the slave wireless device 28 reaches the reception time and starts the carrier sense. are operated, by counting the time until the time when the transmission count information in the received message becomes "n" of the final, it is possible to measure the "time T _a from the start of reception to the reception completed".

Therefore, by applying the measured time T _a to the above equation (correction time = T _a −2ΔT), the clock correction time can be obtained.

Next, a ninth embodiment of the present invention will be described with reference to the operation explanatory view shown in FIG.

The overall structure of the automatic meter-reading wireless system in the ninth embodiment is the same as that shown in FIG. 1, and the parent wireless device 27 and the child wireless device used in the automatic meter-reading wireless system are the same. The configuration of 28 is the same as that shown in FIG. 9, and the communication procedure and the format of the wireless transmission message are the same as those in FIGS. 16 and 12, respectively.

This ninth embodiment also describes a means for correcting the time lag occurring in the clocks of the parent wireless device and the child wireless device as in the case of the eighth embodiment, and the basic idea is the eighth. is the same as in example, the method of calculating the "time T _a from the start of reception until the transmission completed" on the receiving side are different.

That is, in the present embodiment, as shown in FIG. 17, the time T ₅ from the start of carrier sensing until the normal reception of a telegram (in the present embodiment, the transmission telegram is transmitted) as shown in FIG. The time until the reception of (3) is completed is measured.

At the same time, the reception time T ₄ from the normal message reception to the final message (transmission message (n)) is calculated by the following equation.

[0110]

[Number 2] T ₄ = and _{(T 1 + T 2) ×} (n- transmission times of normal reception message), by adding the time T ₅ and the time T _4, from the following equation "start reception It is possible to calculate the time T _a ”until the completion of transmission.

T _a = T ₄ + T ₅ Therefore, this time T _a is calculated by the above equation (correction time = T _a −
By applying it to (2ΔT), the clock correction time can be obtained.

The merit of this embodiment is that the clock correction time can be obtained even if the final message (transmission message (n)) cannot be normally received by wireless communication.

As in the above-described eighth and ninth embodiments, for example, the parent wireless device 27 transmits to the child wireless device 28, and then the child wireless device 28 returns a response. In such a case, there is a possibility that the first plurality of transmissions from the parent wireless device 27 and the responses from the child wireless device 28 may collide with each other. Since it can be detected, after detection,
Collision can be prevented by returning the response from the slave radio device 28 after the transmission pause time T ₂ .

Next, a tenth embodiment of the present invention will be described with reference to FIGS. 18 and 19.

The entire structure of the automatic meter-reading wireless system in the tenth embodiment is the same as that shown in FIG. 1, and the parent wireless device 27 and the child wireless device used in the automatic meter-reading wireless system. The configuration of 28 is the same as that shown in FIG. 9, and the format of the wireless transmission message is also the same as that of FIG. 12 described above.

This tenth embodiment also corrects the time lag occurring in the clocks of the parent wireless device and the child wireless device as in the case of the eighth embodiment, but in general, wireless communication by automatic meter reading is performed. Is about once per month, the wireless communication cycle T is very long, and the clock error ΔT increases in proportion to the wireless communication cycle T. It becomes necessary to perform the transmission for the number of times.

Therefore, in order to prevent this, as shown in FIG. 18, by performing unidirectional communication for clock synchronization from the parent wireless device 27 on the transmitting side, for example, once a day, It is possible to prevent an increase in clock error.

Even in the one-way communication in this case, as shown in FIG. 19, the clock of the child radio device 28 on the receiving side can be corrected by the same method as in the eighth embodiment.

Next, referring to FIG. 20, the eleventh aspect of the present invention.
An example will be described.

In the eleventh embodiment, in the one-way communication for clock synchronization in the tenth embodiment described above, the time is corrected by the same method as in the ninth embodiment.

That is, in the present embodiment, as shown in FIG. 20, the time T ₅ from the time when the reception time comes to the time when carrier sensing is started to the time when a message is normally received (in the present embodiment, the transmission message is transmitted). The time until the reception of (3) is completed is measured.

At the same time, the reception time T ₄ from the normal message reception to the final message (transmission message (n)) is calculated by the following equation.

[0123]

Equation 3] _{T 4 = (T 1 + T} 2) × ( number of times of transmission of n- normal reception message) Then, by adding the time T ₅ and the time T _4, from the following equation "start reception It is possible to calculate the time T _a ”until the completion of transmission.

T _a = T ₄ + T ₅ Therefore, this time T _a is calculated by the equation (correction time = T _a −
By applying it to (2ΔT), the clock correction time can be obtained.

[0125]

As described above, according to the present invention,
Since the wireless communication channel and the clock synchronization communication time are distributed, even when there are multiple wireless devices within the wireless coverage area, without interfering with other systems,
It is possible to reliably perform clock synchronization communication.

Further, according to the present invention, the master setter sends a test communication request command, and the network control wireless device starts the test transmission while adding the transmission count information to the test transmission data. The wireless device for detection detects the final transmission time from the transmission count information in the received data, then returns a response, and the time at which this response is returned is the time counting start time until the next wireless communication. When the device and the wireless device for the terminal are installed, both clocks can be easily synchronized.

Further, according to the present invention, the transmission count information is added to the transmission data from the network control radio unit to perform plural transmissions according to the clock error occurring during the radio communication cycle, and the terminal. The wireless device for the network measures the time from the start of reception to the completion of the transmission on the transmitting side based on the number of times of transmission in the received data, and the time of the internal clock is corrected from this measurement result. Even if there is a slight time lag in the clocks of the wireless devices, this can be corrected appropriately and the clocks of both can be synchronized.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of a wireless system for automatic meter reading according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a detailed internal configuration of a parent wireless device and a child wireless device shown in FIG.

FIG. 3 is an operation explanatory view showing the operation of the first embodiment of the present invention.

FIG. 4 is an operation explanatory view showing the operation of the second embodiment of the present invention.

FIG. 5 is an operation explanatory view showing the operation of the third embodiment of the present invention.

FIG. 6 is an operation explanatory view showing the operation of the fourth embodiment of the present invention.

FIG. 7 is an operation explanatory view showing the operation of the fifth embodiment of the present invention.

FIG. 8 is a block diagram showing an overall configuration of a wireless system for automatic meter reading according to a sixth embodiment of the present invention.

9 is a block diagram showing configurations of a parent wireless device and a child wireless device used in the wireless system for automatic meter reading of the sixth embodiment shown in FIG.

FIG. 10 is a timing explanatory diagram of transmission time on the transmission side and carrier sense on the reception side in the sixth embodiment of the present invention.

FIG. 11 is an operation explanatory view showing the operation of the sixth embodiment of the present invention.

FIG. 12 is a diagram showing a transmission message format of a parent wireless device according to a sixth embodiment of the present invention.

FIG. 13 is an operation explanatory view showing the operation of the seventh embodiment of the present invention.

FIG. 14 is an explanatory diagram showing a relationship between a clock error and a transmission time of a clock incorporated in a wireless device and an idea of a clock synchronization method according to an eighth embodiment of the present invention.

FIG. 15 is an operation explanatory view showing the operation of the eighth embodiment of the present invention.

FIG. 16 is an explanatory diagram showing a communication procedure between a parent wireless device and a child wireless device according to an eighth embodiment of the present invention.

FIG. 17 is an operation explanatory view showing the operation of the ninth embodiment of the present invention.

FIG. 18 is an explanatory diagram showing a communication procedure between a parent wireless device and a child wireless device according to the tenth embodiment of the present invention.

FIG. 19 is an operation explanatory view showing the operation of the tenth embodiment of the present invention.

FIG. 20 is an operation explanatory view showing the operation of the eleventh embodiment of the present invention.

[Explanation of symbols]

 10 storage device 11 antenna 12 radio section circuit 13 modulation / demodulation circuit 14 CPU 17 clock circuit 20 interface circuit 21 center device 22 center network control device 24 switch 26 terminal network control device 27 parent radio device 28 slave radio device 29 meter

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location G08C 17/00 (72) Inventor Jun Fujiwara 2-3, Nakase, Mihama-ku, Chiba-shi, Chiba Tokyo Gas Co., Ltd. Information Technology Research Institute (72) Inventor Toshihiko Kawai 70 Yanagicho, Sachi-ku, Kawasaki-shi, Kanagawa, Toshiba Yanagimachi Co., Ltd. ) Inventor Tetsuya Oki 70 Yanagimachi, Saiwai-ku, Kawasaki City, Kanagawa Prefecture

Claims (8)

[Claims] 1. A center apparatus is connected to a terminal network control apparatus via a telephone line, and a network control wireless apparatus connected to the terminal network control apparatus is connected to a terminal radio apparatus connected to the terminal apparatus. Call the terminal device, collect data from the terminal device to the center device, and collect the data at the predetermined time based on the time of the clock circuits which are built in the network control wireless device and the terminal wireless device, respectively. A wireless system for automatic meter reading that performs wireless communication for collection and synchronized wireless communication of the clock circuit, wherein the network control wireless device and the terminal wireless device are each set to call code data set individually. An automatic system characterized by having means for setting a communication channel for performing the wireless communication and a communication time for synchronizing the clock circuit on the basis of the automatic communication. Radio system for the needle. 2. A center device is connected to a terminal network control device via a telephone line, and a network control wireless device connected to the terminal network control device is connected to a terminal wireless device connected to the terminal device. Call the terminal device, collect data from the terminal device to the center device, and collect the data at the predetermined time based on the time of the clock circuits which are built in the network control wireless device and the terminal wireless device, respectively. A wireless system for automatic meter reading, which performs wireless communication for collection and synchronized wireless communication of the clock circuit, comprising storage means for storing clock synchronization communication time for each customer, and demand stored in the storage means. Setting means for setting the clock synchronization communication time for each house in the customer's wireless device, and when the clock synchronization communication time set by the setting means comes, the network control wireless device and the terminal Wireless systems for automatic meter reading, characterized by having a combined clock synchronous radio communication means for executing wireless communication combined clock synchronization with the use wireless devices. 3. A center device is connected to a terminal network control device via a telephone line, and a network control radio device connected to the terminal network control device is connected to a terminal radio device connected to the terminal device. Call the terminal device, collect data from the terminal device to the center device, and collect the data at the predetermined time based on the time of the clock circuits which are built in the network control wireless device and the terminal wireless device, respectively. An automatic meter-reading wireless system for performing wireless communication for collection and wireless communication for synchronizing the clock circuit, wherein the network control wireless device receives a meter-reading request from the center device by no ringing communication that is regularly performed. Is stored as the clock synchronization communication time, and when the clock synchronization communication time stored in the storage means comes, the network control wireless device and the terminal Wireless systems for automatic meter reading, characterized by having a combined clock synchronous radio communication means for executing wireless communication combined clock synchronization with the line device. 4. A center device is connected to a terminal network control device via a telephone line, and a network control wireless device connected to the terminal network control device is connected to a terminal wireless device connected to the terminal device. Call the terminal device, collect data from the terminal device to the center device, and collect the data at the predetermined time based on the time of the clock circuits which are built in the network control wireless device and the terminal wireless device, respectively. An automatic meter reading wireless system that performs wireless communication for collection and wireless communication for synchronizing the clock circuit, wherein the network control wireless device is a meter reading call date and time data transmitted from the center device when a meter reading request is made by no ringing communication. Storage means for storing as the clock synchronization communication time, and when the clock synchronization communication time stored in the storage means,
A wireless system for automatic meter reading, comprising: clock synchronization wireless communication execution means for performing clock synchronization wireless communication between a network control wireless device and a terminal wireless device. 5. A center device is connected to a terminal network control device through a telephone line, and a network control wireless device connected to the terminal network control device is connected to a terminal wireless device connected to the terminal device. Call the terminal device, collect data from the terminal device to the center device, and collect the data at the predetermined time based on the time of the clock circuits which are built in the network control wireless device and the terminal wireless device, respectively. An automatic meter reading wireless system that performs wireless communication for collection and wireless communication for synchronizing the clock circuit, in which a network control wireless device responds to a test communication request from a master setter to determine the number of transmissions. The transmission data with the information for identification is continuously transmitted, and the terminal wireless device responds to the test communication request from the slave setter to detect the carrier for detecting the transmission carrier. The sense operation is started, the transmission data from the network control wireless device is received, the final transmission data is identified from the transmission count information included in the received transmission data, and the response is made after a predetermined time has elapsed after the final transmission data is received. The wireless system for automatic meter-reading, further comprising means for performing clock synchronization when the wireless device is installed, by making the response completion time the starting time of the time interval until the next wireless communication. 6. A center device is connected to a terminal network control device through a telephone line, and a network control wireless device connected to the terminal network control device is connected to a terminal wireless device connected to the terminal device. Call the terminal device, collect data from the terminal device to the center device, and collect the data at the predetermined time based on the time of the clock circuits which are built in the network control wireless device and the terminal wireless device, respectively. An automatic meter reading wireless system that performs wireless communication for collection and wireless communication for synchronizing the clock circuit, in which a network control wireless device responds to a test communication request from a master setter to determine the number of transmissions. The transmission data with the information for identification is continuously transmitted, and the terminal wireless device responds to the test communication request from the slave setter to detect the carrier for detecting the transmission carrier. Start the sensing operation, receive the transmission data from the network control wireless device, calculate the time from the partner wireless device until the final data is transmitted from the transmission count information included in the received transmission data, A response is returned after a lapse of a predetermined time from the transmission end time of the final transmission data, and the response completion time point is set as the start time point of the time interval until the next wireless communication, thereby providing means for performing clock synchronization at the time of installing the wireless device A wireless system for automatic meter reading, which is characterized in that 7. A center device is connected to a terminal network control device via a telephone line, and a network control wireless device connected to the terminal network control device is connected to a terminal wireless device connected to the terminal device. Call the terminal device, collect data from the terminal device to the center device, and collect the data at the predetermined time based on the time of the clock circuits which are built in the network control wireless device and the terminal wireless device, respectively. An automatic meter reading wireless system for performing wireless communication for collection and wireless communication for synchronizing the clock circuit, wherein the network control wireless device includes means for transmitting transmission data to which information for identifying the number of transmissions is added. The wireless device for terminals starts carrier sense operation for detecting the transmission carrier from the wireless device for network control, and receives the transmission data from the wireless device for network control. , The final transmission data is identified from the transmission count information included in the received transmission data, the time from the start of reception to the completion of reception of the final transmission data is measured, and the time from the measured time to the next wireless communication is calculated. A wireless system for automatic meter reading, characterized by having a correcting means. 8. A center device is connected to a terminal network control device via a telephone line, and a network control wireless device connected to the terminal network control device is connected to a terminal wireless device connected to the terminal device. Call the terminal device, collect data from the terminal device to the center device, and collect the data at the predetermined time based on the time of the clock circuits which are built in the network control wireless device and the terminal wireless device, respectively. An automatic meter reading wireless system for performing wireless communication for collection and wireless communication for synchronizing the clock circuit, wherein the network control wireless device includes means for transmitting transmission data to which information for identifying the number of transmissions is added. The wireless device for terminals starts carrier sense operation for detecting the transmission carrier from the wireless device for network control, and receives the transmission data from the wireless device for network control. At the same time, the time from the start of reception to the completion of reception is measured, and the time until the final transmission data is transmitted is calculated from the transmission count information included in the received transmission data. A wireless system for automatic meter reading, comprising means for correcting the time until wireless communication is performed.