JPH02121597A - Telemeter system - Google Patents

Abstract

PURPOSE:To reduce a time required for collection of gauge examination data by performing a terminal call during periods between intermittent receiving periods by using an area address common to all terminal equipments provided in an area to be communicated, releasing the intermittent reception for all terminal equipment, and creating a continuous receiving state. CONSTITUTION:When central equipment 1 sends a call signal containing an area address, all terminal equipments (2-1)-(2-n) is set to continuous receiving states after the lapse of time which is the sum of an intermittent receiving period and prescribed time and, at the same time, 2nd timers 9 to which different time is set are simultaneously actuated. Every time the 2nd timers 9 time-up, data communication is successively started and, upon completion of the data communication, each terminal equipment is restored to the initial state. As a result, the processing time required for telemeter communication comes to the sum of the data communication time Tt plus marginal time alpha of each terminal equipment multiplied by the number of N-set of terminal equipment and the intermittent receiving period. Therefore, the telemeter communication processing time can be reduced sharply.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a telemeter system that collects meter reading data and the like by performing wireless data communication in the dark between one central device and a plurality of terminal devices.

[Prior art] Conventionally, in the wireless telemeter system used in gas-saving facilities, which consists of one central unit and N terminal units, the terminal units installed in each dwelling unit are powered by batteries. Therefore, in order to be able to operate for a long period of time without replacing the parts, the receiver is operated at a predetermined period, for example every 5 minutes, for a predetermined period of time. It uses an intermittent reception method.

Data collection for such a telemake system is carried out, for example, by moving a central device mounted on a vehicle to the meter-reading area on the first day of monthly inspections, and then transferring data to multiple terminal devices installed in the meter-reading area in advance. The terminals are sequentially called using the individual addresses included in the call signal from the central device, and the terminal devices that have received a signal matching the individual address included in the calling signal from the central device are caused to sequentially transmit measurement data to the central device.

[Problems to be Solved by the Invention] However, in such a conventional telemaking system, the maximum intermittent reception cycle, for example, 5 minutes, is required for each terminal device that uses an intermittent reception method. Adding the data communication time, it takes a long time, and it is difficult to collect data on both sides by sequentially calling a large number of terminal devices.
There was a problem that it took a long time.

The present invention has been made in view of these conventional problems, and is intended to enable telemeter communication by calling a large number of terminal devices in the shortest possible time when the terminal employs an intermittent reception method. The purpose is to provide a telemeter system.

[Means for Solving the Problems] First, the present invention consists of one central device and a plurality of terminal devices, each of the central device and the terminal devices is equipped with a transmitting/receiving section for bidirectional data communication, and the terminal device Each of the devices waits a predetermined number of times to receive a ringing signal from the central device.
The present invention is directed to a telemeter system that performs intermittent reception in which the receiver is activated by power supply from a battery for a predetermined time every J and enters a reception state.

Regarding such a telemaking system, in the invention of claim 1, a data processing control section provided in the terminal device performs a predetermined process that includes a call signal from the central device within a predetermined period of time when the receiving section is operating. When receiving a signal that matches the area address set for each predetermined area, the intermittent reception operation is canceled and the reception operation continues thereafter, and when the reception of the calling signal from the central device stops, Starts a timer that has a predetermined set time that is different from other terminal devices.
, when the set time of this timer has elapsed, data communication with the central device is started, and this data communication ends ゛Q initial state (
The configuration is configured to restore the open-hole reception state).

In addition, in the invention of claim 2, the data processing control section provided in the terminal device sets the settings for each predetermined region included in the call 8 from the central device within a predetermined time when the receiving section is operating. When receiving a signal that matches the specified area address, the intermittent reception is canceled and the reception operation continues after that, and in the continuous reception state, the individual address preset for each terminal device included in the call signal from the central device is sent. When a signal matching the data is received, data communication is started with the central device, and this data communication termination port is configured to be restored to the initial state (intermittent reception state).

[Operation] In the telemeter system of the present invention having such a configuration, terminal calls using an area address common to all terminal devices installed in the area to be communicated are made during the intermittent reception cycle. By doing so, it is possible to cancel intermittent reception on all terminal devices and create a continuous reception state.

In this way, when all terminal devices are in the continuous reception state and the call from the central device is stopped, the timers installed in each terminal device with different set times start all at once.
Data communication between the terminal device and the central device is started in the order in which the timer reaches the set time, and when the data communication ends, the terminal device is restored to its initial state.

Data communication can be started by setting up a timer by sending data from the terminal device to the central unit when the timer is set up, or by maintaining the state of receiving 5 questions for a predetermined number of times after setting up the timer, and then transmitting data to the central unit during the timer set-up. If there is an individual call from the server, the data will be sent to the central unit.

Of course, if you don't mind a little more battery consumption,
In a continuous reception state after a general call to a local address, the central device may sequentially call the terminal devices using individual addresses for data communication.

As a result, the processing time for the central device to call N terminal devices and perform data communication can be (intermittent time period) + N·(data communication time). For example, intermittent time period - 5 minutes, number of terminals N = 50
In the case of 0 units and data communication time - 1Qsec, what conventionally required a maximum of 42 hours, with the present invention,
1;>Kunhanchoma's short story I1. 'You can hang out in the bay for a while.

[Example] FIG. 1 is an explanatory diagram showing the system configuration of the present invention.

In FIG. 1, 1 is a central device, and in this embodiment, the central device 1 is taken as an example of a mobile station mounted on a vehicle. 2-1.2-2゜...2-n is a terminal device, and the terminal devices 2-1 to 2-n are installed in each residential unit.For example, taking a gas meter reading system as an example, the terminal devices 2-1 to 2-n are used as measurement loads. A gas make and a gas cutoff valve are used as control loads.

In the telemeter system of the present invention composed of the central device 1 and the terminal devices 2-1 to 2-n, for example, the central device 1 as a mobile station is connected to the terminal device 2-n on the meter reading day once a month. Groups 1 to 2-n go to pre-installed areas and conduct telemeter communications wirelessly, which will be explained later.

FIG. 2 is a block diagram showing an embodiment of the terminal device shown in FIG. 1.

In FIG. 2, the device 2 is the transmitting/receiving antenna 3.
, a transmitting/receiving section 4, a data processing control section 5, a power supply control section 6, a power supply section 7 using a battery as a power source, a first timer 8, a second timer 9, and an 81 measuring device 10 such as a gas meter.

That is, the first timer 8 controls the intermittent reception of the terminal device 2, and the timer output of the timer 8 is determined by the timer output from the power supply section 7 to the transmitting/receiving section 4 and the data processing control section for a predetermined time every predetermined period. 5. For example, the timer 8 generates a timer output of 100 m5 every 5 minutes, and the power supply control section 6 supplies power to the transmitting/receiving section 4 and the data processing control section 5 from the power supply section 7 for 100 m5 every 5 minutes.
The data processing section 11 5 switches the transmitting/receiving section 4 to the receiving side and performs a receiving operation during the power feeding period of 100 m5.

The data processing control unit 6 performs intermittent reception control using the first timer 8, and when the transmitting/receiving unit 4 enters the receiving operation state,
In this receiving operation state, when a signal matching the area address set for each predetermined area included in the calling signal from the central device 1 is received, the power control unit 6 operates based on the timer output of the first timer 8. Intermittent reception is canceled and the reception operation can continue from now on. That is, timer 8
Even after the reception operation time of 100 m5 set by the timer output has elapsed, the power supply control unit 6 continues to supply power to the transmitting/receiving unit 4 and the data processing control unit 5 in response to an intermittent reception cancellation command from the data processing control unit 5. I will start doing it.

When the data processing control unit 5 cancels intermittent reception and creates a continuous reception state by receiving a signal matching the area address included in the paging signal from the central device 1, at the same time the reception of the paging signal is stopped, the second timer 9 is started. The second timer 9 is the terminal device 2-1 shown in FIG.
~2-n different setting times TI, T2, ・
...Tn is set. For example, the set time of the second timer 9 is set in the order of terminal devices Q2-1 to Q2-n]! , r question T
It is set to become longer in sequence: I<T-2<K3...<ln.

Furthermore, between the set times (Ti) and (Ti+1) of the second timer 9 set to terminal devices 2-i and 2-(i+1>), the data communication time from the terminal device to the central device is T.
[, If the margin 1!1 is α, then (Ti+1>-(Ti
)=Tt+α, the time is set so that the time difference is as follows.

When the data processing control section 5 starts the timer 9, the power supply section 7
In order to reduce current consumption, the power supply control unit 6 is controlled to stop power supply to the transmitting/receiving unit 4 and data processing control unit 5.

In this way, the second timer 9 sends J,
When the set time is reached and a timer output occurs due to time-up, the power supply control section 6 supplies power to the transmission/reception section 4 and the data processing control section 5 from the power supply section 7 . At that time, the data processing control section 5 starts communication of the measurement data being received from the measurement devices 10 to the central device 1, and after the communication of this measurement data is completed, the data processing control section 5 returns to the initial state, that is, the intermittent reception state. It will be restored to .

As soon as the second timer 9 times up, the transmission data of the measurement data from the device 10 to the central device 1 is created by, for example, creating a transmission code consisting of (area address) + (individual address) + (measurement data). and then send it out.

FIG. 3 is a block diagram showing an embodiment of the central device 1 shown in FIG.
6. Consists of a display unit 17 such as a CRT or printer.

That is, the central processing unit 1 moves to a communication area covering the terminal devices 2-1 to 2-n as shown in FIG. When a collection operation is performed, the data processing control unit 14 switches the transmitting/receiving unit 13 to the transmitting side, and adds a predetermined margin time to the intermittent reception cycle set in the terminal device shown in FIG. 2, for example, 5 minutes. All terminal devices 2-1 according to time
~2-n and transmits a calling signal including an area address for receiving (nff) connection status.The calling signal sent from this central device includes 1~-- which indicates the area address in the carrier signal. The signal to which the main signal is added is used.

When the data processing control unit 14 finishes transmitting the calling signal including the area address to the terminal device, it switches the transmitting/receiving unit 13 to the receiving side, and in the state of switching to the receiving side, the data processing control unit 14 terminates the transmission of the calling signal including the area address to the terminal device. The data processing control section 14 reads the transmitted data using IW, and the received and decoded continuation data is stored in the storage section 15, and at the same time, the display section 17 prints it out or displays it on a CRT.

Next, the control operation of the terminal device of the present invention shown in FIG. 2 will be explained with reference to the flowchart shown in FIG. 4.

First, in the terminal device shown in FIG. 2, based on the timer output of the first timer 8, the power supply control section 6 sends the transmission/reception section from the power supply section 7 for a predetermined period of time, for example, 100 m5, every 5 minutes, for example, in an intermittent reception cycle. 4 and the data processing control section 5. Upon receiving this power supply, the data processing control section 5 switches the transmitter/receiver section 4 to the receiving side, creating a so-called intermittent reception state.

That is, when it is determined in step S1 of FIG. 4 that the intermittent reception cycle has been reached, the transmitter/receiver 4 and the data processing controller
becomes operational and creates a receiving mode, and step S
In step 2, the presence or absence of a paging signal from the central device 1 is checked based on the presence or absence of carrier signal detection.

If no call is made from central device 1,
Since the carrier detection in step S2 is not obtained, the terminal device 2 causes the power supply control unit 6 to control the transmission/reception unit 4 and the data processing control unit 5 after the intermittent reception time of 100 m5 set by the first timer 8 has elapsed. Even if the power supply is cut off, the process returns to step S1 and the next intermittent reception station is started! J, who is checking to see if he has reached v1, groans.

On the other hand, as shown in FIG. 1, there is a central device 1 as a mobile station using a vehicle in the area where the terminal devices 2-1 to 2-n are installed, and the central device 1 is directed to the terminal devices 21 to 2-n in the area where the terminal devices 2-1 to 2-n are installed. Assume that the Ilf output signal including the address is sent at a time equal to the intermittent reception period directly at the terminal device plus a predetermined time.

The call number 13 from the central unit 1 consists of a combination of a carrier signal and, for example, a 1 to 1 signal indicating an area address.

Therefore, in step S1 of FIG. 4, I? The transmitting/receiving section 4 and the data processing control section 5 are activated when the Sl missed reception cycle is reached, and the transmitting/receiving section 4 is switched to the receiving side in step S2.
Then, carrier detection is performed based on the reception of the paging signal from the central device 1, and the process proceeds to step S3, where a signal matching a preset area address is received from the tone signal transmitted as the area address following the carrier signal. Then, the process proceeds to step S4, where it is checked whether a signal matching a unique individual address preset in the terminal device has been received.

When this first call signal is sent by the central device 1, since the call signal includes only the area address,
In step S4, reception of a signal that matches the individual address is not determined, and the process proceeds to step S5, where the previous intermittent reception is canceled and continuous reception is set. When the continuous reception state is set in step S5, the data processing control unit 5 determines whether reception of the activation call signal from the central device 1 has ended in step S6, and starts the second timer 9 in step S7.

In this embodiment, the timer 9 indicates the end of reception of the calling signal.
Although the activation signal g is used as the activation signal g, another activation signal g may be sent.

From such steps S1 to 87 (the central device 1
jing that matches the area address included in the ejection from g
The control for canceling intermittent reception and continuous reception based on the reception of , and the activation control for the second timer 9 are performed simultaneously by the plural terminal devices 2-1 to 2-n shown in FIG. It will be held in

Next, in step S8, it is monitored whether or not the second timer started in step S7 has timed up, and when it is determined that the second timer has timed up, the communication process for the h-1 measurement data from step S9 onwards is started. move on.

Here, the setting time of the second timer 9 provided in the terminal devices 2-1 to 2n shown in FIG. 1 is TI.

Since the time settings are different in the order of T2, .

When the time up of the second timer 9 is determined in step S8, the process proceeds to step S9, and this time measurement t! For example, h1 measurement of a gas meter is performed using the instrument 10, and step SI
A transmission code consisting of the area address, individual address, and measurement data is created in step O, and in step S11, the transmitter/receiver section 4 is switched to the communication mode, and in step S12, transmission to the central device 1 is started. Furthermore, in this embodiment, 51 measurements are performed after the timer 9 times up, but if the data is transmitted using measurement data that has been measured in advance at predetermined intervals, the communication time can be further shortened.

When transmission to the central device 1 is started in step S12, it is determined in the next step S13 whether or not a certain period of time has elapsed since the start of transmission, and if it is within a certain period of time, the transmission data sent from the central device 1 is received in step S14. Checks whether reception of a confirmation signal is detected based on .

That is, in step S12, data is transmitted from the terminal device to the central device 1, and when it is confirmed that the transmitted data from the terminal device has been normally received on the central device 1 side, the central device 1 transmits data to the terminal device. A confirmation signal will be sent in response.

Therefore, if a confirmation signal from the central device 1 is detected in step S14 within one fixed day set in step S13, it is assumed that the transmission data has been sent normally, and the state returns to the initial state of step S1, that is, the intermittent reception state. Recover. Also,
Even if a confirmation signal is not obtained from the central device 1 within a certain period of time, if the certain period of time is exceeded in step S13, the process is forcibly returned to step S1 and the initial state is restored.

In the telemeter system shown in FIG. 1 by controlling the response of the terminal devices based on the calling signal from the central device 1 as shown in the flowchart of FIG. Terminal device 2-
1 to 2-n all release the intermittent reception after a predetermined time has been added to the intermittent reception cycle and enter the continuous reception state, and simultaneously start the second timer with different time settings, and set the time to a different time. Each time the second timer with 1 times out, data communication is sequentially started with the central device 1, and when the data communication is finished, the initial state is restored. The processing time required for this bundling and telemeter communication between the central device 1 and the plurality of terminal devices 2-1 to 2-n is the sum of the number of terminals N, the data communication time Tt for each terminal, and the margin time α. The intermittent time is the time added to the intermittent reception cycle, and the processing time required for telemeter communication can be significantly reduced compared to the conventional case where terminal devices are sequentially called to perform data communication.

On the other hand, in the flowchart of FIG. 4, when it is desired to individually measure data or remotely control appropriate terminal devices from the central device 1, a call signal consisting of a carrier signal, an area address, an individual address, or a control code is used. A call signal is sent with the addition of

In this way, from the center g''L;l 1, the terminal device 2 with 11 constant
When a paging signal for both data side or terminal control is sent to the terminal, carrier detection is performed in step S2, and step S3 is performed.
Step S
4) When a signal matching the individual address is received in step S4, that is, the own address is determined, the process proceeds to step 315 to check whether or not a cutoff code has been detected. If the block is detected, step S16
Then proceed to perform cutoff control of the gas cutoff valve.

On the other hand, if the cutoff code is not detected in step S5, the detection of the open code is checked in step S17, and if the release code is detected, the opening control of the gas cutoff valve is performed in step S15.

On the other hand, step S15. If neither the cutoff code nor the release code is detected in step S17, the process advances to step S9, where the measuring device 10 measures data, and in step 310, a transmission code consisting of the area address, individual address, and h1 measurement data is created, and in step S11. The transmitting/receiving unit 4 is switched to the transmitting side, and in step S12 it transmits the IT test data to the central device, and after detecting the confirmation signal from the central device 1h) in step S14 or waiting for the elapse of a certain period of time in step S13. It will now be restored to its initial state.

FIG. 5 is a flowchart showing the control process of the central device 1 shown in FIG. 3 for performing simultaneous storage for the terminal devices shown in FIG. 4.

That is, in the control process of the central device 1 shown in FIG.
First, in step S1, as shown in FIG.
While moving to the installation area 1 to 2-n, a calling signal including a preset area address is sent out, and the sending of this calling signal is continued for a certain period of time in step S2, that is, a certain period of time is added to the intermittent period of the terminal device. It continues to be sent over time. By transmitting this area address signal for a certain period of time, the terminal devices 2-1 to 2-2 are sent as shown in steps 81 to S5 in FIG.
-n, the intermittent reception is canceled based on the determination of the area address, and the state is switched to continuous reception.

Subsequently, proceeding to step S3 and transmitting a start signal 1,
After receiving the transmission of the activation signal in step S3,
When the activation signal is detected in step S6 of the terminal device in the figure, the second timer 9 is activated.

When the transmission 8 of the activation signal g is completed in step S3, step S
Proceeding to step 4, the central device 1 switches to receiving mode. Subsequently, when data from the terminal is received in step S5, the received data is analyzed in step S6. That is, since the data received from the terminal is composed of the area address, individual address, and measurement data, at least three of these data are analyzed, and in step S7, the measurement data is stored in the storage unit 15 along with the area address and the individual address. In the memory department.

Next, in step S8, it is determined whether all terminals have finished on the body side, and the processes of steps 85 to S7 are repeated until t1 of all terminals is determined.
When it is determined that the measurement has ended, the process proceeds to step S9, where the torso side data stored in the storage unit 15 is converted into a file, and the process proceeds to step SIO.
Then, the printer provided as the display section 17 prints out the information.

FIG. 6 shows the collection of h1 measurement data specifying a specific terminal device and/or terminal 1i111 in the central device of FIG. 3.
3 is a flowchart showing the processing operation of 3fl.

Immediately, when data collection or control is performed with the central device 1 specifying a specific terminal device, a calling signal including an area address and an individual address is transmitted in step S1, and the transmission of this calling signal is fixed in step S2. Continue until the time has elapsed. That is, in step S2, the transmission of the ejection signal is continued until the period of intermittent reception plus a predetermined time has elapsed.

By transmitting the calling signal including the area address and the individual address in step S1, the terminal device transmits the individual address in step 87'1 as shown in flowchart p-I in FIG. It is determined that a signal matching the above is received, and the process proceeds to step S15 and subsequent steps.

Of course, if the terminal device is controlled in step S1, a control code will be transmitted in addition to the area address and individual address.

Subsequently, in step S3, the central device switches to the reception mode, and when terminal data is received in step S4, the process proceeds to step S3.
The received data is analyzed in Step 5 and stored in the storage section 15 in Step S6, then the stored data in the storage section 15 is converted into a file in Step S7, and the series of processing is completed by printing 1 to 1 in Step S8.

In addition, 5th. In the operation flow of the central device 1 shown in FIG. 6, the sending of a confirmation signal when receiving data from a terminal is omitted, but the confirmation signal is sent when the reception of data sent from the terminal is completed. Of course, it is also possible to do so.

Next, a second embodiment of the present invention will be described.

In this second embodiment, a plurality of terminal devices 2-1 to 2
-n receives the discharge signal including the area address from the central device 1 and starts the second timers 9 all at once, and when the second timers 9 time up sequentially, as in the previous embodiment, IF measurement data is not transmitted to the central device 1, but a fixed reception time Tr is set, and when a call is received from the central device 1 with a call signal including an individual address during this reception time Tr, the IF measurement data is not transmitted to the central device 1. It is characterized by transmitting data to a central device.

That is, in the terminal control of the first embodiment shown in the flowchart of FIG. 3, as shown in FIG. .2-2
The setting ff,' by the second timer 9 which is different from TI
, T2 is set, and the setting time T2 of the terminal device 2-2
is the data communication time -' in the setting time T1 of the terminal device 2-1.
l- is the time obtained by adding a predetermined margin [1] to α, thereby preventing a collision between the transmissions of the terminal devices 2-1 and 2-2.

However, in order to prevent transmission collisions between terminal devices, if the second tl:'j interval is set by adding the margin time α, the number of installed terminal devices N (multiplying this by the margin time α) (Processing 11, which is the main part of the telemeter communication of the entire screw 1 and S), will take about 3 degrees longer.Therefore, in the second embodiment, as shown in FIG. 8, for example, the terminal device 2- 1
and 2-2, each different second timer l
Set TI, T2 between h, set time -rl, -1
'2 is timed up when constant reception ■) between -'r
This reception port makes a call from the central device 1 using an individual address specifying the terminal device 2-1, 2-2 during 17il Tr, and calls from the central device 1 within the reception time lr. Based on the individual call, h1 measurement data is sent to the central unit 1 as shown by the broken line.

By the processing operation of the terminal device according to the second embodiment shown in FIG. 8, the processing time required to collect body side data from the entire terminal device can be further shortened compared to the 7A51 embodiment shown in FIG. 7. Can be done.

FIG. 9 is an explanatory diagram showing a third embodiment of the present invention, which corresponds to the second embodiment of the invention.

That is, in the third embodiment of the present invention, the second timer 9 of the terminal device 2 shown in FIG. If the intermittent reception of all the terminal devices is canceled and the reception continues for a period of time equal to the signal cycle plus a predetermined time, when the paging signal is sent out, the reception continues. When a call signal including an individual address sent from the central device 1 is received and a signal matching the individual address set for itself is received, the body side data is sent to the central device 1 to enter the initial state, that is, the intermittent reception state. Let it be restored.

For example, in Figure 0, terminal device 2-1.22.2-3
For example, if the central device 1 sends out the area address for a predetermined interval [11] in the intermittent reception period of the floor device, the sending of the call number 1z including the area address ends. tlkoma: All terminals at 1t1) Devices 2-1 to 2-
3 is the continuous reception state by dividing the intermittent reception by Vft.

Next, the central device 1 sends out a discharge signal including the area address and the individual address to the terminal devices 2-12-2 and 2-3 in this order, and upon receiving this paging signal g, *'w1: the terminal device 2-1.
．． 2-2.2-3 performs the 51 measurement data transmission operation following the reception operation, and when the data transmission is completed, the initial state is restored.

In the third embodiment shown in FIG. 9, there is no need to provide the second timer 9 in each terminal device, and the timer 9
Since there is no need to control the terminal side based on the above, the configuration and control chain of the terminal side device JR'1 can be made simpler.

In addition, the above-mentioned 1. In both the second and third embodiments, for example, during meter reading once a month, δ1 measurement data is sequentially transmitted from the terminal device 2-1 to terminal device 2-n. As a result, the operating time of the terminal device 2-n, which transmits the data last, becomes longer than the operating time of the terminal device 2-1, which transmits the measurement data first, and the degree of battery depletion increases. -1 is the least, terminal equipment [
η2−n becomes the largest.

Therefore, it is desirable that the terminal device 2-n transmits data first, and the terminal device 2-1 transmits data last.

To achieve this, in the first and second embodiments, the setting time of the second timer 9 of 32G in the terminal device shown in FIG. good. For example, if the setting port 21 of the second timer 9 of the terminal device 2-1 was set to T1 during this month's meter reading, the central device 1 will set +1. '1 switching signal is output to the terminal device 2-1, and the setting time of the second timer 9 is set to the terminal device 2-r this time for the next inspection. 1-
All you have to do is switch to J-un.

On the other hand, in the third embodiment shown in FIG. 9, by reversing the order in which the central device 1 calls the terminal devices, the battery consumption state of the terminal devices as a whole can be approximately equalized. can be kept.

[Effects of the Invention] According to the present invention as described above, the number of terminal devices adopting the intermittent reception method is n,” r J , 'υ is
The data communication time due to the terminal is multiplied by the intermittent period.
Since the processing time is as short as + and '1, it is possible to collect data using efficient premeter communication.
Furthermore, the number of terminal devices under the jurisdiction of one central device can be increased.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram of the present invention; FIG. 2 is a block diagram showing a first embodiment of the terminal device of the present invention; FIG. 3 is a block diagram showing an embodiment of the central device of the present invention. ; Fig. 4 is a flowchart showing the control operation of the terminal device in Fig. 2; Fig. 5 is a flowchart showing the simultaneous calling process of all terminals by the central processing unit in Fig. 3; Fig. 6 is a flowchart showing the control operation of the terminal device in Fig. 3; A flowchart showing the calling process of a specific terminal by the central processing unit; Fig. 7 is an explanatory diagram showing the correlation between the timer time and transmission of the terminal device in the first embodiment; An explanatory diagram showing the mutual relationship between the timer time and the transmission time according to the second embodiment of the present invention: Fig. 9 is an explanatory diagram showing the communication control between the central device and the terminal device according to the third embodiment of the present invention.1: Central device 2-1 to 2-n: Terminal device 3.12: Transmission/reception antenna 4.13: Transmission/reception section 5.14: Data processing control section 6: Power supply 1 plug 1j section 7: Power supply section 8: First timer ( (for intermittent reception control) 9: Second timer (-for general paging transmission) 10: i'
RL side device 15: Storage section 16: Operation section 17: Display section

Claims (1)

[Claims] 1. Consisting of one central device and a plurality of terminal devices, each of the central device and the terminal devices is equipped with a transmitter/receiver unit for bidirectional data communication, and each of the terminal devices is , in a telemeter system that performs intermittent reception in which a receiving unit is activated for a predetermined time every predetermined period to receive a call signal from the central device, the terminal device is configured to operate the receiving unit; When a signal matching the area address set for each predetermined area included in the calling signal from the central device is received within a predetermined time period, the intermittent reception is canceled and the reception operation is continued thereafter. , and at the time when reception of the call signal from the central device stops, a timer having a set time different from that of other terminal devices is started, and data communication with the central device is started after the set time of the timer has elapsed. A telemeter system comprising: a data processing control section that restores the initial state after the end of the data communication. 2. Consisting of one central device and a plurality of terminal devices, each of the central device and the terminal devices is equipped with a transmitter/receiver unit for bidirectional data communication, and each of the terminal devices is
In a telemeter system that performs intermittent reception in which a receiving unit is activated for a predetermined period of time every predetermined cycle to receive a call signal from the central device, the terminal device has a receiving unit that is activated. When a signal matching the area address set for each predetermined area included in the calling signal from the central device is received within a predetermined time, the intermittent reception is canceled and the reception operation continues thereafter, and the When receiving a signal matching an individual address preset for each terminal device included in a paging signal from the central device in the continuous reception state, data communication is started with the central device, and the data communication is terminated. A telemeter system characterized by being provided with a data processing control section that later restores the initial state.