JP3476378B2 - Wireless telemeter system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal network control unit (hereinafter abbreviated as T-NCU) connected to a center side network control unit via a public telephone line, and a wireless main unit connected to the T-NCU. The present invention relates to a wireless telemeter system configured by a microcomputer (hereinafter abbreviated as a main terminal) and a wireless slave device (hereinafter abbreviated as a sub terminal) connected to a microcomputer meter for gas, water and the like.

[0002]

2. Description of the Related Art A conventional radio telemeter system performs a synchronous intermittent reception operation and determines whether an incoming radio wave is from a pair of radio units at an early stage. An ID (hereinafter, abbreviated as group ID) for discriminating whether or not it is a target station group is added with a small number of bits. Here, the intermittent reception operation means that the transmission and reception timings are intermittently synchronized with each other in order to suppress power consumption during wireless communication between the main terminal and the sub terminal. . The main terminal and the sub terminal have the same time data, and simultaneously perform the receiving operation in a predetermined cycle.

Further, in the conventional system, the group ID is always added to the transmission message even in the communication state in which the sub terminal and the main terminal transmit and receive each other. Therefore, on the receiving side, it was possible to discriminate at an early stage whether or not the pair of wireless units. This will be described with reference to FIG.

FIG. 17 is a diagram showing the structure of a message format of transmission data. With reference to FIG. 17, the message format of the transmission data includes a group ID, a wireless header, a reception call code (hereinafter referred to as “reception ID”), and specific data.

As shown in FIG. 17, if a group ID consisting of 8 bits is added to the beginning of a message, it is possible to determine whether the wireless unit is a pair by reading the group ID at an early stage. .

However, since the synchronization signal is not received at the time of receiving the group ID, a bit or frame synchronization shift occurs, resulting in a data error. Therefore, it is necessary to set the 8-bit configuration as one block, receive a group ID composed of a plurality of blocks, and make a majority decision on the received data.

From the above, the group I of at least 5 blocks has a modulation rate of 1200 pps in binary FSK modulation.
When D is received, by adding the group ID, it is possible to basically determine whether it is a pair of wireless units in about 33 ms.

FIG. 18 is a diagram showing a format of a wireless header. As shown in FIG. 18, the wireless header includes a bit synchronizing signal, a frame synchronizing signal, and a calling code of the transmitting side.

FIG. 19 is a diagram showing a conventional reception timing. In the conventional format, the receiving side operation is in the continuous reception state when the carrier of the target frequency is present at the start of the intermittent reception and the group ID and the transmission ID in the radio header match. In addition, if the reception IDs match, all data is received and the communication state is entered. That is, it was necessary to set only the transmission message length to the receiving state.

On the other hand, generally, in wireless communication, an error is likely to occur in "0" or "1" bit after consecutive "1" or "0" bits. This is because the input voltage of the waveform shaping circuit in the wireless communication unit is biased. Since the wireless communication unit is in the state of receiving the random signal due to the white noise even when there is no radio wave of the target frequency, it is not known when the bias occurs.

For this reason, a bit synchronization signal in which "1" and "0" are alternately arranged is usually placed at the beginning of the transmission data. As a result, accurate synchronization and demodulated data were obtained on the receiving side.

However, in the conventional system, it is necessary to receive a plurality of blocks in order to accurately receive the group ID when there is no bit synchronization signal.

[0013]

However, in the conventional method, the reception time at the time of activation is lengthened by the time when the group ID is added. Even after the link is established between the main terminal and the sub terminal, the communication time is the group ID.
It was longer than it was without. In addition, Group I
Since the reception from D is started, a bit error is likely to occur and it takes time to recognize.

[0014] Here, the Association of Rad
io Industries and Businesses) presents a standard for wireless equipment (STD-16A), it is assumed that the terminal on the transmission side uses binary FSK modulation and the modulation rate is 1
If data is transmitted at 200 bps, 131 bits or more are usually required for the sync signal and 63 or 126 bits for the calling code according to the format of the communication data.
Therefore, at least 161 (= 1/1
200 bps x (131 bits + 63 bits) x 100
For the time of 0) ms, it was necessary to continue the reception state every time a radio wave arrived.

The present invention has been made in order to solve the above-described problems, and in order to quickly determine the presence of a pair of wireless units, even if the group ID is added to the transmission data, the transmission time is almost eliminated. An object of the present invention is to provide a wireless telemeter system capable of improving the recognition of reception of a group ID without extending the link, improving link establishment at the time of intermittent reception, and improving the efficiency of system operation.

It is an object of the present invention to provide a wireless telemeter system capable of quickly discriminating a pair of wireless units and improving system operation efficiency.

[0017]

Means for Solving the Problems A radio tape according to the first invention
Les meter system, the OLT, and the terminal network controller connected via a communication line to the center device, a master unit connected to an end end network controller, intermittently communicate with the master unit and the radio Ri Do from a child machine, groups are combined and a master unit and the slave unit is Ru is formed. The base unit is the group I after the radio header.
A transmission for transmitting a signal followed by D and a transmission ID to the slave unit.
Including communication means. When there is a signal to be received by the slave unit,
Confirms the presence of the bit for a predetermined first time
Then, if the existence of the bit is continuously confirmed for the first time,
Read data when the second predetermined time has passed
To check the group ID by
Confirmation method, confirmed group ID and stored in the handset
Match the group data and after the group ID
The transmission ID read in and the master unit set as the slave unit
If the ID matches, the opening for starting continuous reception operation is started.
And starting means.

According to the first invention, a wireless telemetry system is provided.
The master unit included in the system is the group ID after the wireless header.
And a signal followed by the transmission ID is transmitted to the slave. Child machine receives
If there is a signal to be transmitted, the confirmation method of the slave unit must be
Confirm the presence of the bit for the defined first time. Bit
When the second time elapses, the presence of the
Read the data (eg, confirmed bits) and
Check the loop ID. Guru confirmed in this way
Group ID and group data stored in the slave
If it matches, the start means starts the continuous reception operation and
The communication link is established. This will allow communication
The operating efficiency of the system
improves. This allows you to have a pair of wireless units
A group ID is added to the transmitted data for early discrimination.
Even if added, the transmission time is almost
Improves recognition of loop ID reception and links for intermittent reception
It is possible to improve the efficiency of system operation by improving the establishment.
A wireless telemeter system can be provided.

A radio telemeter system according to a second aspect of the present invention is a center-side device, a terminal network control device connected to the center-side device via a communication line, a master unit connected to the terminal network control device, and a master device. And a plurality of slave units that communicate with each other by radio. The base unit and the handset communicate with each other intermittently using a predetermined transmission signal. The base unit transmits a transmission signal including a group identification signal for identifying a group, a transmission side identification signal for identifying a transmission side device, and a reception side identification signal for identifying a reception side device based on an instruction from the center side device. A requesting unit for requesting data transmission to a plurality of slave units belonging to a predetermined group at the same time is included. The cordless handset
A detection unit for detecting the transmission signal, and a group identification signal to which the group identification signal and the transmission side identification signal are given to each of the plurality of slave units based on the transmission signal.
If it matches the constant signal and the sender specific signal , the transmission signal
The calling code of the receiving side represented by the receiving side identification signal included in the
It judges whether it is not the same as the calling code of its own, and it is not the same.
The call code of the receiving side that was determined to be
Distribute the call code of the receiving side and the call code of its own according to the size relationship.
By arranging the columns, the group includes a determination unit for determining the data transmission order of the child device itself in the group, and an automatic transmission unit for transmitting data to the parent device based on the determined data transmission order. According to the second invention, when a plurality of slave units belonging to a predetermined group detect a request for data transmission by the master unit, the determining unit of the slave unit determines each of the slave units in the group based on the transmission signal from the master unit. Determine the transmission order of the handset. This determination is performed based on the group identification signal, the transmission side identification signal, and the reception side identification signal included in the transmission signal. That is, for each of the multiple slaves
Group specific signal and transmitter specific signal are
Group specific signal and transmitter specific signal given to the machine
If the transmission signal matches that particular slave unit,
Send from the parent device to which it belongs to the child devices in the specified group.
Judged as trusted. The determination means includes the transmission signal.
The calling code of the receiving side represented by the specified signal of the receiving side
It is determined whether or not the calling code of the fixed child device does not match.
The determination means determines the calling code of the receiving side that is determined to be inconsistent.
Remember. This stored receiver call code is
It is a code given to another child device included in the loop. Size
The disconnection means is the stored call code of the receiving side and the call of the handset itself.
The output code and the output code are arranged based on the magnitude relationship . Do this
Then, the receiving side calls of all the slave units included in the predetermined group are
In the sequence of outgoing codes, what is the calling code of the specific slave unit?
Since it is determined whether it is the second position, the determination means
The data transmission order of the cordless handset itself in the group
You can judge. As a result, the child device in the group can send the data to the parent device based on the transmission order determined for each data transmission request.

Radio telemeter system according to the third invention
In addition to the configuration of the first or second invention,
Manchester encoding with bit signal converted to 2 bits
The specified signal that identifies the group is used to communicate with the base unit.
It further includes a synchronization means for synchronizing the reception time. Third
According to the invention, synchronization during communication between the master unit and the slave unit
Is the Manchester encoded signal,
Can be reliably taken by the signal specifying

Radio telemeter system according to the fourth invention
Connect to the center side device and the center device via a communication line.
Connected to the terminal network control device and connected to the terminal network control device.
The master unit and the slave unit that communicates wirelessly with the master unit.
And the child machine are combined to form a group. The base unit is
Identify the group following the communication synchronization signal with the handset
The transmission means for intermittently transmitting the signal to be performed is included. Child
Machine acquired the signal transmitted intermittently and acquired
The number of bits included in the signal is detected by a predetermined number.
By knowing, the slave unit itself can be distinguished by the acquired signal.
Confirmation to confirm whether it belongs to the specified group
Means and belong to the group identified by the signal
When confirmed, a starting means for starting the continuous reception operation
Including and According to the fourth invention, the signal is transmitted from the master unit to the slave unit.
If it is transmitted intermittently, the slave unit will predetermine from that signal.
The number of assigned bits (eg
Multiple times the number of bits) is detected and the cordless handset itself
Check whether it belongs to. For example, if the handset is 16 bits
Sequence of strings (for example, 111100000001000
0) is detected. Group ID is shown in this sequence
Contains a bit string (for example, 00000001)
Then, the child machine is placed in the group identified by this signal.
Make sure you belong. After that, continuous reception operation is started.
Connection, the communication link between the master and slave will be established.
It By detecting the bit in this way,
To improve the accuracy of checking whether or not the
You can Therefore, prompt communication after link establishment
System operation efficiency
Go up.

Radio telemeter system according to a fifth aspect of the invention
In addition to the configuration of the fourth aspect of the invention,
Is started, followed by a signal identifying the group.
Sender that identifies the sender of the signal that identifies the group
Further included is means for transmitting a ringing signal. 5th departure
According to Ming, the receiving side, after starting the continuous reception operation,
Can identify the sender of the signal that identifies the group
Therefore, the length of the transmission message when transitioning to the communication state is shortened.
You can do it. This reduces the communication time
be able to.

Radio telemeter system according to the sixth invention
In addition to the configuration of the fourth invention,
Manchester-encoded, with the number converted to 2 bits,
Synchronize with the master unit based on the signal that identifies the loop
Further included is synchronization means for. According to the sixth invention,
As for the signal that identifies the loop, 1-bit signal becomes 2-bit
The converted Manchester-encoded signal. this
Such signals have a low error rate during reception.
Therefore, in order to shorten the communication time, send only once during communication.
Even if the receiving side does not reduce the recognition, the synchronization is ensured.
It can be taken really.

A wireless telemeter system according to a seventh aspect of the present invention is a center-side device, a terminal network control device connected to the center-side device via a communication line, a master unit connected to the terminal network control device, and a master device. And a plurality of slave units that communicate with each other by radio. The master unit has a group identification signal that identifies the group,
A communication means for communicating with a slave unit by using a transmission signal including a transmission side identification signal for identifying the transmission side device and a reception side identification signal for identifying the reception side device, and a center side by using the transmission signal. Requesting means for requesting data transmission to a plurality of slave units belonging to a predetermined group all at once based on an instruction from the device. The slave unit detects the transmission signal intermittently, and a group identification signal and a transmission side identification signal are given to itself based on the detected transmission signal for each of the plurality of slave units.
Group matching signal and transmitter specific signal ,
Receiving side call represented by receiving side specific signal included in transmission signal
Judge whether the code does not match its own calling code ,
Store and store the calling code of the receiving side that is determined to be inconsistent
The received call code and the call code of its own
Flip by sequencing, the transmission determining means for determining the data transmission order of the child device itself definitive to a group, the data transmission is requested, the data in the parent device based on the determined data transmission order And automatic transmission means for doing so.

According to the seventh invention, a plurality of slave units belonging to a predetermined group detect a data transmission request from the master unit .
Then , the determination unit of the slave unit determines the transmission order of each slave unit in the group based on the transmission signal from the master unit. This determination is performed based on the group identification signal, the transmission side identification signal, and the reception side identification signal included in the transmission signal. That is, for each of the plurality of slave units, the glue
The specified signal and the specified signal on the transmitting side are given to the specified slave unit.
Matched group-specific signal and transmitter-side specific signal
If so, the transmission signal is the master unit to which the particular slave unit belongs.
Sent to a child device in the specified group from
It is judged that. The judgment means is the reception included in the transmission signal.
The call code on the receiving side represented by the side-specific signal is
It is determined whether or not the calling code does not match. Judgment means
Stores the call code of the receiving side that is determined to be inconsistent
It This stored calling code is stored within that group.
Is a code given to another child device included in. Judgment means
Is the stored call code of the receiving side and the call code of the handset itself.
And are arranged based on the magnitude relationship. This way,
Receiving side call codes of all the slaves included in a given group
In the sequence of, the call code of that particular cordless handset
Since it is determined whether it is located, the judgment means depends on the position.
Determine the data transmission order of the child device itself in the group
can do. As a result, the slave units in the group are based on the transmission order determined for each data transmission request.
Then, the data can be transmitted to the base unit.

Radio telemeter system according to the eighth invention
In addition to the configuration of the seventh invention,
Data transmission from a child machine whose order is one higher than the child machine itself
Further included is means for detecting end of communication. Automatic transmission
When the end of data transmission is detected, the means sets the data on the master side.
Means for transmitting data. According to the eighth invention
And the child device with the next highest data transmission order transmits data.
When you finish, the slave unit that has the next data transmission order
Will send the data to the base unit, so the data will not be sent.
It is possible to prevent wasteful time from being generated.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(1) First Embodiment FIG. 1 is a system configuration diagram showing an embodiment of a wireless telemeter system according to the present invention. Referring to FIG.
The wireless telemeter system 1 includes a host computer 11
Center side network control device 12 and telephone line 13 connected to
T-NC connected to the center-side network control device 12 via
U14 and main terminal 15 connected to T-NCU14
And a meter 17 for electricity, gas, water, etc. connected to the sub-terminal 16. Data communication is performed wirelessly between the main terminal 15 and the sub terminal 16.

FIG. 2A is a block diagram showing the configuration of the main terminal 15, and FIG. 2B is a block diagram showing the configuration of the sub terminal 16. Referring to FIG. 2A, the main terminal 15 includes a T-NCU interface 201, a microcomputer 203a that controls the entire main terminal 15, and a ROM 206a and a RAM 207 connected to the microcomputer 203a.
a, a non-volatile memory 202a for registering the calling code of the own station or the partner station, a wireless communication unit 204a, a battery 208a for supplying power to the entire main terminal 15, and an antenna 205a connected to the wireless communication unit 204a. including.

Referring to FIG. 2B, the sub terminal 16
An antenna 205b that receives a signal from the antenna 205a of the main terminal 15, a wireless communication unit 204b connected to the antenna 205b, a microcomputer 203b that controls the entire sub terminal 16, a ROM 206b and a RAM 207b connected to the microcomputer 203b, A non-volatile memory 202b for registration of the calling code of the own station or the partner station, a meter or the like 209 including a sensor connected to the microcomputer 203b,
A battery 208b that supplies power to the entire sub-terminal 16 is included. The microcomputers 203a and 203b have clock and timer functions.

FIG. 3 is a diagram showing the structure of a basic wireless message format. Referring to FIG. 3, the basic wireless format is composed of a wireless header, a reception ID, and data.

The receiving procedure of the wireless telemeter system according to the present invention will be described with reference to FIGS. FIG. 4 is a flowchart showing a process from the intermittent reception operation to the link confirmation on the receiving side. In the process of link determination, first, while performing intermittent reception (step S4
1, the following steps will be omitted), and the arrival of radio waves from the other party is waited for (S42). When it is determined that the radio wave has arrived (Y in S42), the reception operation is continued (S43). Next, the calling code (hereinafter abbreviated as transmission ID) of the transmission side included in the wireless header is read (S44), and it is confirmed whether or not it is a pair (S45).

After that, the calling code of the receiving side (hereinafter referred to as receiving ID
Is abbreviated) is confirmed whether or not it matches with its own calling code (S46). Only when they match (Y in S46), the link is confirmed (S47), and when they do not match, the intermittent reception operation is resumed (S41).

That is, each time a radio wave arrives, regardless of whether it is a pair or not, it remains in the receiving state until the confirmation of each calling code is completed.

FIG. 5 is a diagram showing the structure of a message format according to the present invention. Referring to FIG. 5, a message format according to the present invention includes a wireless header, a group ID,
It is composed of a transmission ID, a reception ID, and data.

FIG. 6 is a diagram showing reception timing in the wireless telemeter system according to the present invention. In the format according to the present invention, the operation principle of shifting from the intermittent reception operation to the communication state is the same as the conventional one. However, since the group ID is arranged after the wireless header, it is necessary to add the transmission ID part after the group ID. This is because the reception is performed after the confirmation of the group ID and the data of the wireless header before the group ID is not considered. If binary FSK modulation is used and the modulation speed is 1200 bps and the reception state is changed from the group ID, the transmission ID is 4 bits x
It is represented by 12 digits. That is, since it is composed of 48 bits, the reception time is shortened by 161 ms (wireless header time) -40 ms (transmission ID time) = 121 ms as compared with the conventional method. As a result, it is possible to save power.

FIG. 7 is a diagram showing the structure of the format of the end message according to the present invention. With reference to FIG. 7, the end message includes a wireless header, a transmission ID, a reception ID, and an END signal. The communication time can be shortened by transmitting in the format shown in FIG. 3 excluding the group ID from the start of the intermittent reception state to the communication state until the end message as shown in FIG. 7 is transmitted or received. To be

In the present invention, since the receiving state is set after the bit synchronization signal, it is necessary to receive the group ID without the bit synchronization signal. Since it takes a lot of time to receive a plurality of blocks, the group ID is Manchester-encoded to suppress bit errors that occur during waveform shaping.

Manchester encoding will now be described. Generally, when a radio wave is demodulated and the waveform is shaped, the DC voltage component of the detection signal varies depending on the input frequency, so the waveform shaping circuit removes the DC component from the capacitor to perform wave shaping. Therefore, when continuous "1" or "0" bits for a certain time or more are received, a bit error occurs during waveform shaping due to the bias of the DC voltage. For example,
Following a continuous "1" or "0" bit, "0"
Alternatively, when 1 bit of "1" is transmitted, a bit error occurs on the receiving side. From this, only the group ID that indicates whether or not it is the target station group with the number of bits smaller than the calling code is "0" to 2 bits of "1,0",
"1" is converted into 2 bits of "0, 1" and transmitted. This conversion is called Manchester encoding.

Although the number of bits of the group ID is doubled here, the number of blocks can be reduced to two.
Since only the group ID is Manchester-encoded, subsequent data does not become long, and as a result, the communication time can be shortened.

FIG. 8 is a diagram for explaining a state in which the group ID is Manchester encoded. When the group ID is Manchester-encoded, if the group ID consists of 8 bits, the group ID is 0 in hexadecimal.
There are 256 ways from 0H to FFH. 00H in which all bits that make up the group ID are "0" or "1"
When FFH and FFH are Manchester encoded, the result is as shown in FIG. Thus, in the alternating pattern of "1" and "0",
Bit synchronization signals from other main terminals and sub-terminals may be mistakenly recognized as having the same group ID.

FIG. 9 is a diagram showing a state in which the group ID used in the present invention is Manchester-encoded. In the present invention, the group ID is set to 254 types from 01H to FEH. For example, in the case of 01H and 55H, it becomes as shown in FIG. There is always one or more consecutive 2 bits in one block. That is, the state of "0" or "1" is continued for two normal bits.

FIG. 10 is a flow chart showing a process of receiving a group ID at the time of intermittent reception. With reference to FIG. 10, a procedure of group ID reception at the time of intermittent reception will be described. Here, suppose that the modulation rate is 120 with binary FSK modulation.
The operation will be described based on the fact that 1 bit length is 0.8 ms when 0 pps is set.

First, it is checked whether or not there is a radio wave of a target frequency (S111). When there is a radio wave of the target frequency (Y in S112), 1.5-bit length, that is, 1.
It is checked whether the state of "0" or "1" is continued for 2 ms (S112). If not continued (N in 112), the process returns to S111. When the data has been continued for 1.2 ms (Y in S112), data is fetched every 1-bit-long delay time (S113) (S114).

Next, the 2-bit length, that is, 1.6 ms later (S
The data is again read into 115) (S116). It is checked whether 16 bits (2 blocks) have been imported (S11
7) If less than 16 bits (N in S117), S1
Return to 15. When it becomes 16 bits or more (Y in S117), the group ID is checked (S118). Since the data fetched at this time is not always fetched from the first bit of the group ID, it is checked whether the group IDs match while shifting the fetched data string. From this, in order to reliably receive one block, it is necessary to receive at least two block lengths (16 bits). On the transmitting side, it is necessary to transmit the minimum group ID for a length of 3 blocks. Next, when the group IDs match, the operation of receiving the transmission ID is performed (S11
9) If they do not match, intermittent reception is performed (S120).

FIG. 11 is a diagram showing the reception timing of one block length when the group ID is, for example, 55H and the data fetched at that time. At this time, bit synchronization is established, but frame synchronization is not established. Therefore, 8
The group ID composed of bits may be indistinguishable from a maximum of 8 patterns shifted by 1 bit.

Therefore, it is finally necessary to shift to the communication state by judging the transmission ID. By doing as described above, accurate synchronization can be easily achieved even if reception is started from the group ID.

(2) Second Embodiment Hereinafter, the second embodiment of the present invention will be described with reference to FIGS. 12 and 13.
Will be described with reference to. In the second embodiment, a system having one main terminal and a plurality of sub terminals (hereinafter, referred to as 1
(For n system).

FIG. 12 is a diagram showing a sequence at the time of conventional simultaneous meter reading. In this system, there is only one group ID. When issuing a meter reading instruction to a plurality of sub-terminals, it is necessary to activate individual meters 1, meters 2, ... Therefore, FIG.
As shown in, it took a very long time to get the data of each meter on the main terminal.

FIG. 13 is a sequence diagram at the time of simultaneous meter reading in the second embodiment of the present invention. In this embodiment, when the upper 1 bit of the group ID is "1", the simultaneous meter reading is instructed. That is, if simultaneous meter reading is performed when the group ID is 01H, for example, data 81H is transmitted.

A plurality of sub-terminals belonging to the group whose group ID is 01H simultaneously perform meter reading of a microcomputer meter for gas, water, etc. Therefore, the communication that requires the longest time can be started once. As a result, the efficiency of the system can be improved.

(3) Third Embodiment In the third embodiment, a plurality of sub-terminals judge their own data transmission order within a group to which they belong and automatically transmit data to the main terminal. To do. As a result, the meter reading request signal from the main terminal becomes unnecessary.

Next, a third embodiment of the present invention will be described with reference to FIG.
~ It demonstrates with reference to FIG. FIG. 14 is a diagram showing a structure of an ACK message format according to the present invention. Referring to FIG. 14, the ACK message is the wireless header and the transmission ID.
, A reception ID, and an ACK signal.

FIG. 15 is a sequence diagram at the time of simultaneous meter reading of the present invention. Referring to FIG. 15, in the 1-to-n system, the sub-terminals are arranged where the radio waves of the main terminal reach. Therefore, all the sub-terminals that are receiving intermittently in response to the activation from the main terminal become continuous reception and read the reception ID. If it matches the calling code given to him, it is judged that it was sent to himself. That is, if the sending IDs match but the receiving IDs do not match, it is determined that the sending IDs were sent to another sub-terminal in the same group. And the reception ID
Memorize By repeating this, each sub terminal stores the reception IDs of all the sub terminals in the group, for example, in the RAM 207 of the sub terminal.

For example, the calling code of the own station is 0000000.
0000 and the stored reception ID is 0000000
0000, 00000000000005, 000000
When there are three 000010, the calling code of the own station and the size of the stored reception ID are compared. It can be seen that if you place them in order from the smaller one, your station will be ranked second. Also, assuming that it usually takes 10 seconds to return the meter reading value after receiving the meter reading request, the sub-terminal with the second priority automatically reads the meter reading value 2 × 10 seconds = 20 seconds after receiving the simultaneous meter reading request. If the response is to the main terminal, the meter reading request signal from the main terminal becomes unnecessary. As a result, the software can be simplified.

In FIG. 15, T1 is the response time of the sub-terminal 1 having the first rank. In this case 10ms x 1 = 10ms
Becomes Others are the same, T2 = 20 ms, Tn = 10 ms
Xn.

FIG. 16 is another sequence diagram at the time of simultaneous meter reading of the present invention. When the main terminal requests the simultaneous meter reading, the sub-terminals whose order is determined based on the magnitude of the stored reception ID and the calling code of the time station are as follows. That is, the sub-terminal that the main terminal transmits is one rank higher than its own station (in the above example, the reception ID is 000000000002)
To receive an ACK signal for and respond immediately. As a result, the efficiency of the entire system can be improved.

Next, consider the case where the main terminal is activated from the sub terminal. Conventionally, when the sub-terminal tries to transmit, if there is a carrier, it prepares for retransmission and waits for the next transmission timing. This timing is a synchronization timing between the main terminal and the sub terminal. That is, even if the affected communication ends while waiting for transmission, the transmission is delayed by the time of the synchronization cycle of the maximum intermittent operation. Therefore, when the sub-terminal attempts to transmit, if there is a carrier, the communication is monitored and it is judged from the transmission message of the main terminal whether the communication is within the same group.

When the communication is within the same group, the termination message from the main terminal is monitored. Immediately after confirming that the transmission has been started, the waiting transmission is started. If they are not in the same group, the normal transmission standby state is entered. On the other hand, it is assumed that the main terminal is in the receiving state for a few seconds after transmitting the termination message and then returns to the intermittent reception operation. Then, the sub-terminals that are in the transmission standby state during the reception state after the end telegram is sequentially transmitted. As a result, the system can be operated efficiently.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of a wireless telemeter system according to the present invention.

FIG. 2 is a block diagram showing a configuration of a main terminal and a sub terminal of the present invention.

FIG. 3 is a diagram showing a configuration of a basic wireless message format.

FIG. 4 is a flowchart showing a processing procedure from intermittent reception operation to link confirmation (reception side).

FIG. 5 is a diagram showing the structure of a message format according to the present invention.

FIG. 6 is a diagram showing reception timing according to the present invention.

FIG. 7 is a diagram showing a format of an end message.

FIG. 8 is a diagram illustrating a state in which the group ID of the present invention is Manchester-encoded.

FIG. 9 is a diagram illustrating a state in which the group ID of the present invention is Manchester encoded.

FIG. 10 is a flowchart showing a procedure of group ID reception at the time of intermittent reception of the present invention.

FIG. 11 is a diagram showing the reception timing of one block length when the group ID of the present invention is 55H and the data captured at that time.

FIG. 12 is a sequence diagram when a conventional simultaneous meter reading is performed.

FIG. 13 is a sequence diagram at the time of simultaneous meter reading of the present invention.

FIG. 14 is a diagram showing a configuration of an ACK message format according to the present invention.

FIG. 15 is a sequence diagram at the time of simultaneous meter reading of the present invention.

FIG. 16 is a diagram showing a format configuration of an ACK message according to the present invention.

FIG. 17 is a diagram showing a configuration of a conventional electronic message format.

FIG. 18 is a diagram showing a format of a wireless header.

FIG. 19 is a diagram showing conventional reception timing.

[Explanation of symbols]

11 Host computer 12 Center side network control device 13 telephone lines 14 T-NCU 15 Wireless base unit (main terminal) 16 Wireless cordless handset (sub terminal) 17 meters 202a, 202b Non-volatile memory 203a, 203b Microcomputer 204a, 204b wireless communication unit 205a, 205b antenna

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-10-304468 (JP, A) JP-A-2-121597 (JP, A) JP-A-6-351071 (JP, A) JP-A-8- 23586 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04Q 9/00 H04M 11/00

Claims (8)

(57) [Claims] 1. A center-side device, a terminal network control device connected to the center-side device via a communication line, a master device connected to the terminal network control device, and wirelessly intermittent communication with the master device. A wireless telemeter system including a child device, wherein the parent device and the child device are combined to form a group, and the parent device sends a group ID and a transmission after a wireless header.
It includes a transmitting means for transmitting a signal followed by the ID to the child device.
However, if there is a signal to be received , the slave unit is set to a predetermined first
Check for the presence of bits for a period of time,
If the confirmation is continued for the first time, the predetermined
To read the data when the time of 2 has passed
Confirmation means for confirming the group ID, the confirmed group ID and the group stored in the slave unit.
After matching the loop data and after the group ID
The transmission ID read in and before being set in the slave unit
When the ID of the master device matches, continuous reception operation starts
And a wireless telemeter system including: 2. A center side device, a terminal network control device connected to the center side device via a communication line, a master unit connected to the terminal network control device, and wireless communication with the master unit. A wireless telemeter system comprising a plurality of slaves, wherein the master and the slaves intermittently communicate with each other using a predetermined transmission signal, and the master is an instruction from the center-side device. On the basis of a group specifying signal for specifying a group, a transmitting side specifying signal for specifying a transmitting side device, and a transmitting signal including a receiving side specifying signal for specifying a receiving side device, to a predetermined group Including a requesting unit for requesting simultaneous data transmission to a plurality of slave units to which the slave unit belongs, wherein the slave unit includes a detecting unit for detecting the transmission signal, and the plurality of slave units based on the transmission signal. For each of the machines, Serial group identification signal group specifying signal and the transmission-side specific signal is given to the self and sender Patent
When it matches with the constant signal, it is determined whether or not the receiving side calling code represented by the receiving side specifying signal included in the transmission signal does not match its own calling code, and it is determined that they do not match.
The receiving side call code stored therein, and the stored receiving side call stored therein
Arrange the code and the calling code of the self according to the magnitude relationship.
By this, a determining unit for determining the data transmission order of the slave unit itself in the group , and an automatic transmitting unit for transmitting data to the master unit based on the determined data transmission order. Including wireless telemetry system. 3. The signal for identifying the group is 1 bit.
Manchester coded by converting the signal
Signal, the slave unit being the Manchester-encoded group
Signal to specify the synchronization during communication with the base unit.
3. The wireless telemeter system according to claim 1 or 2 , further comprising synchronization means for taking . 4. A center side device and a communication line connected to the center side device.
Connected to the terminal network control device and the terminal network control device
A connected master unit and a slave unit that wirelessly communicates with the master unit.
A wireless telemeter system comprising:
Group is formed by combining with the slave unit, and the master unit follows the communication synchronization signal with the slave unit.
To intermittently transmit a signal that identifies the group.
For transmitting the intermittently transmitted signal to the slave unit,
The number of bits included in the signal is a predetermined number
By detecting, the slave unit itself detects the
Check whether it belongs to the group specified by the issue
Confirmation means for confirming that it belongs to the group specified by the signal
Then, starting means for starting the continuous reception operation is provided.
Including wireless telemetry system. 5. The master unit starts the continuous reception operation.
Then, following the signal identifying the group,
Sender call that identifies the sender of the signal that identifies the group
The wireless telemeter system of claim 4, further comprising means for transmitting an outgoing signal . 6. A signal for identifying the group is 1 bit.
Manchester coded by converting the signal
And the Manchester encoded signal is the master encoded signal and the slave encoded signal.
Is transmitted only once in a single communication with the slave unit based on the Manchester encoded signal.
And further includes a synchronization means for synchronizing with the master unit.
The wireless telemeter system of claim 4, including . 7. A center side device, a terminal network control device connected to the center side device via a communication line, a master unit connected to the terminal network control device, and wireless communication with the master unit. A wireless telemeter system comprising a plurality of slave units, wherein the master unit is a group specifying signal for specifying a group, a transmitting side specifying signal for specifying a transmitting side device, and a receiving side specifying signal for specifying a receiving side device. Communication means for communicating with the slave unit using a transmission signal including, and the plurality of slave units belonging to a predetermined group based on an instruction from the center-side device using the transmission signal. relative, and a request means for requesting the broadcast data transmission, the child machine, a detection means for intermittently detecting the transmission signal, based on the detected transmission signal, the Of multiple slaves
For each, the group identification signal and the transmission side identification signal are assigned to the group identification signal and
And the transmission side specific signal , the transmission signal is included in the transmission signal.
The call code on the receiving side represented by the specified signal on the receiving side
Judge whether or not the calling code does not match, and do not match
The calling code determined to be stored is stored, and the stored calling code is stored.
The call code of the receiving side and the call code of the self are handled according to the size relationship.
By arranged Flip, before and determining means for determining the data transmission order for definitive slave machine itself Kigu loop, if the data transmission is requested, the master unit based on the data transmission order A wireless telemeter system including automatic transmission means for transmitting data. 8. The data transmission order of the slave unit is the
Data transmission from the child device, which is one higher than the child device itself,
Means for detecting the end, wherein the automatic transmission means detects the end of the data transmission.
Then, a means for transmitting data to the master side is included.
No wireless telemetry system according to claim 7.