JPS5831635B2 - Random data - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system for receiving randomly generated meter reading data between a plurality of terminal devices.

Conventionally, a terminal device was placed to read the electricity consumption of a general residence, building, etc., and the meter reading data of the electricity consumption value read by this terminal device was sent to a relay device installed on a pole using a low-voltage power distribution line. After reading the meter reading data from a plurality of terminal devices, the meter reading data is transmitted from the relay device to the solid device using a communication line or the like using a read signal from the solid device installed at a business office or the like.

In this way, in the conventional method of receiving meter reading data, the relay device calls a specific terminal device and receives the meter reading data of that terminal device, and as intended in the present application, the relay device calls a specific terminal device and receives the meter reading data of that terminal device. There is still no method for receiving generated meter reading data.

However, when meter reading data is randomly generated from multiple terminal devices, the relay device first receives and stores the meter reading data, as described later, and then stores it when a call signal is received from the solid device to the relay device. It would be common to transmit the contents from the relay device to the solid device, and simultaneously or thereafter receive and store new meter reading data in the relay device.

However, if such a method is adopted, there will be no problem if there is no failure in the transmission line, etc. However, for example, if a failure occurs in the transmission line between the solid equipment and the relay equipment, or if there is a failure in the equipment of the solid equipment. If a failure occurs, the meter reading data cannot be rewritten because the relay device does not receive a call signal.

Therefore, if the solid device calls the relay device after the failure has been recovered, the old meter reading data that has already been stored will be sent from the relay device, and the solid device should collect new meter reading data. What should have been done ends up collecting old meter reading data, which could lead to a lack of reliability as a data collection device.

The present invention has been made in view of the above-mentioned circumstances.In a device that receives meter reading data randomly generated from a plurality of terminal devices, if the device receiving the meter reading data does not have a call signal for data rewriting, By detecting an overflow in the memory circuit of the device and sending out a clear signal from the timer device at a preset time to clear old meter reading data and making it possible to receive new meter reading data, the memory circuit is effectively utilized. In addition, we provide a meter reading data reception method that allows new meter reading data to be constantly transmitted from the receiving device to the external device without being affected even if the external device, such as a solid device, becomes temporarily unavailable due to a failure. It is something to do.

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

FIG. 1 is a schematic block diagram of a system that collects meter reading data by applying this method.

The commercial frequency power of the high voltage distribution line 1 is stepped down by a transformer 2 and is then fed to the low voltage distribution line 3.

This low voltage distribution line 3 has many terminal devices 4. ... (installed at each consumer) is connected, and this terminal device 4. ... reads the consumption values of electricity, gas, etc. of each customer and randomly sends them to the low-voltage distribution line 3 as meter reading data.

In addition, as a means for randomly sending out the detection data, for example, a circuit that issues a start signal every time the measured value of the electricity meter increments by a fixed value, and sends meter reading data when this start signal is issued. All you have to do is configure.

With this circuit, since power consumption generally varies from household to household, the timing of sending detection data can be randomized.

Alternatively, a pseudo random signal may be generated by selecting the sign of the parallel outputs of the feedback shift register circuit using a switch circuit or the like, and the meter reading data may be generated using this as a starting signal.

Meter reading data randomly generated by a plurality of terminal devices 4, .

The specific configuration of this relay device 5 is shown in FIG. A solid device 7 which is an external device is connected to this relay device 5 via a communication line 6.
is connected.

Relay device that received and stored meter reading data5. ... indicates that when the calling signal (relay number) from the solid device 7 is the corresponding number, a response signal, that is, meter reading data is sent back from the corresponding relay device 5 to the solid device 7.

This response signal is sent to the terminal devices 4 for several homes stored in the relay device 5. This is the meter reading data of...

Next, Figure 2 shows the terminal equipment 4. . . is a time chart when meter reading data is collected in the solid device 7.

That is, as shown in FIG. 2, first, the solid device 7 sends out a coded calling signal (relay number) specifying a specific relay device 5a.

This calling signal is received by the relay device 5a of the corresponding relay number, and the relay device 5a receives the terminal device 4. Since the meter reading data of ... is received and stored, the meter reading data of the stored contents is returned to the solid device 7.

At this time, new meter reading data is being sent from the terminal device 4.degree., so the relay device 5a sends the meter reading data to the solid device 7, clears the stored contents, and receives and stores the new meter reading data.

In the solid device 7, a large number of relay devices 5a are connected at predetermined time intervals.

5b... sequentially sends a paging signal to the terminal device 4.5b...・・・
・Collect meter reading data.

Now, even though the solid device 7 specifies the second relay device 5b and sends a call signal, if the relay device 5b cannot receive the call signal, the structure of FIG. 3 described later is used to store the call signal. It detects a circuit overflow, clears old meter reading data after a predetermined period of time, and receives and stores new meter reading data.

Even if a response signal (meter reading data) is not returned from the second relay device 5b, the solid device 7 calls the next relay device 5ct5d, . Meter reading data is collected from 5d, . . . 5n.

FIG. 3 shows a device that receives meter reading data randomly generated from a plurality of terminal devices, and corresponds to the relay device shown in FIG. 1.

In Figure 3, CPL cuts off the commercial frequency and connects the low-voltage distribution line 3.
and the communication line 6 at high frequency to take out the meter reading data of the terminal device 4, DEM is a demodulation circuit that receives and demodulates the meter reading data taken out through the combining circuit CPL, DEC
The signal demodulated by the demodulation circuit DEM is stored in the storage circuit MEM.
This is a decoding circuit that decodes the pulse signal for storage.

This memory circuit MEM has a predetermined memory capacity, and the terminal device 4. ... are stored in the order in which they are received, until the storage capacity overflows.

For example, meter reading data is serially shifted into a storage element such as a shift register in the order in which it is received, and stored until the capacity of the shift register overflows.

Therefore, meter reading data of the terminal device 4 that consumes a large amount of power may be stored twice within the above storage capacity range.

Here, overflow detection is performed by an overflow detection circuit OFD, which will be described later.
When an overflow detection signal is generated from D, the memory circuit MEM closes the gate circuit and prohibits subsequent input of detected data to the shift register.

In other words, meter reading data received after overflow is discarded.

The above meter reading data is stored in the terminal device 4. . . . and meter reading data of the terminal, and each of these pieces of information is stored in the storage circuit MEM.

On the other hand, when a read signal is generated from a verification circuit IDT, which will be described later, the memory circuit MEM sequentially shifts and outputs each meter reading data in series, reads it out, and supplies it to the gate circuit INT.

When the reading of the meter reading data is finished, this completion is detected by a bit counter or the like, and the contents of the shift register as a storage element are cleared.

To clear this shift register, enter NO to the shift register.
” by shifting and inputting them in parallel.

When this clearing is completed, the memory circuit MEM returns to the operation of writing meter reading data.

The memory circuit MEM also clears the contents of the shift register when a clear signal arrives from a timer TIM, which will be described later, and then starts writing meter reading data.

OFD is an overflow detection circuit that detects an overflow of the memory circuit MEM and starts a timer circuit TIM, and is composed of, for example, a bit counter.

Therefore, the memory capacity of the memory circuit MEM is equivalent to that of the terminal device 4 of five houses.
．． When storing the meter reading data of .

CLG is a signal generator that generates clock pulses of a predetermined period in synchronization with the commercial frequency, and supplies the clock pulses obtained thereby to the timer circuit TIM.

The timer circuit TIM is set to a predetermined time by, for example, an adjustment knob of the time setting section 10, and counts clock pulses of the signal generator CLG when the overflow detection signal is started by the overflow detection circuit OFD, and the counted number reaches the set value. When the preset time is reached, that is, when the preset time is reached, a clear signal is sent to the memory circuit MEM to clear the memory contents of the circuit MEM and store new meter reading data, and at the same time, the self-timer circuit TIM is set to zero. It is set to return.

Note that the clearing operation of the memory contents in the memory circuit MEM is performed when the memory area overflows and the timer circuit TI
This is performed when there is no call signal from the solid device 7 within the set time of M, and if there is a call signal from the solid device 7 before the overflow occurs, or even if there is an overflow but before the set time, the process will be described later. The memory contents of the memory circuit MEM are read out and then cleared.

Then, the memory circuit MEM returns to an operating state in which it stores newly received meter reading data.

The reason why the timer circuit TIM generates the clear signal after a predetermined time has elapsed is to take into consideration the difference in the reception interval of the calling signal.

On the other hand, the calling signal from the solid device 7 is demodulated by the demodulation circuit DEM, decoded into a pulse signal by the decoding circuit DEC, and then supplied to the matching circuit II) IT.

This verification circuit IDT has the number of its own sewing device set in advance in the relay number setting section 11, and compares this with the relay number signal which is the call signal of the solid device 7, and if the result matches, sends a read signal to the memory circuit MEM,
If they do not match, a signal is sent to the reset circuit R8T.

INT is a gate circuit that sends the meter reading data read from the memory circuit MEM to the modulation circuit MOD in synchronization with the signal from the signal generator CIG.

However, this gate circuit INT prevents the meter reading data from passing by a reset signal from the reset circuit R3T.

The modulation circuit MOD modulates meter reading data from terminal devices of several houses and transmits the modulated data to the solid device 7.

Next, the operation of the relay device shown in FIG. 3 will be explained.

First, a plurality of terminal devices 4.・・・
・When meter reading data is sent to the low-voltage distribution line 3, those terminal devices 4. . . . receives the data via the coupling circuit CPL, and transmits the data to the demodulation circuit DEM.
and stored in the memory circuit MEM via the decoding circuit DEC.

After that, when the solid device T sends out a call signal including relay number data for meter reading data collection, the fourth
As shown in the figure, the relay device 5 corresponding to the relay number receives the call signal from the solid device 7, demodulates it in the demodulation circuit DEM, decodes it in the decoding circuit DEC, and then decodes it in the verification circuit I.
Supply to DT.

Since the relay number of its own relay device 5 has already been set in this verification circuit IDT, this setting number is compared with the relay number included in the call signal of the solid device 7, and if they match, a readout signal is supplied to the memory circuit MEM. do.

As a result, the storage circuit MEM of the relay device 5 sends the already stored meter reading data to the gate circuit INT, and after the data transmission is completed as shown in FIG. 4, it is automatically cleared in the storage circuit.

Even if a clear signal arrives from the timer circuit TIM at the same time as or immediately after the clear signal in the memory circuit, the memory circuit MEM does not accept it.

The meter reading data read from the memory circuit MEM is outputted in the gate circuit INT under the control of the clock pulse of the signal generator CLG, modulated by the modulation circuit MOD, and sent to the solid device 7 as a response signal.

Since the memory circuit MEM outputs the meter reading data and then clears it, it is in an empty state, so it is already generated randomly and the combination circuit CPL - demodulation circuit DEM - decoding circuit DEC
Immediately store meter reading data that has been passed through the process.

When a call signal arrives from the solid device 7 to the relay device 5 at regular intervals, the relay number is checked and the memory circuit M
Meter reading data from the EM is read out and sent to the solid device 7, and new meter reading data is stored in the memory circuit MEM.

However, if the relay device 5 cannot receive the call signal of the solid device 7 due to a failure of the solid device 7 or a failure of the transmission line between the solid device 7 and the relay device 5, the relay device 5 will randomly generate a call signal. The meter reading data of the terminal device 4°... is stored in the storage circuit MEM.

When the meter reading data stored in the memory circuit MEM is written to the memory capacity, the overflow detection circuit OFD, which has been detecting this memory state, detects the overflow of the memory circuit MEM and starts the timer circuit TIM.

This timer circuit TIM is activated by the signal generator CL at the same time as starting.
Count the G clock pulses.

In the timer circuit TIM, the signal generator CLG
When it counts a predetermined number of clock pulses, it sends a clear signal to the memory circuit MEM and returns its own count to zero.

The memory circuit MEM clears its memory contents with the clear signal from the timer circuit TIM, and the new meter reading data is transferred to the terminal device 4.
．． ...If it occurs, it is received and stored.

Furthermore, even if there is no failure in the solid device 7 or the transmission line and the solid device 7 mistakenly sends out a calling signal except for the relay device 5, the signal from the matching circuit IDT will be transmitted via the reset circuit R8T as described above. The logic circuit built in the gate circuit INT is cleared, and if the memory circuit MEM has overflowed, the overflow detection circuit 0FD-timer circuit T is cleared.
A clear signal is supplied to the memory circuit MEM via the IM, and the memory contents are cleared.

Note that in the present invention, each terminal device 4. Since the meter reading data transmitted from ... arrive randomly, in some cases, multiple meter reading data may overlap (convergence).

However, in the relay device, regardless of whether the meter reading data is generated randomly, the demodulation circuit DEM and the composite circuit DEC perform bit synchronization, etc., to perform length determination, content check using parity bits, transportation verification, etc. of the meter reading data. If any inconvenience is discovered as a result of this, the meter reading data will be rejected.

Therefore, even if the meter reading data is generated randomly, the reliability of the received results will not deteriorate.

Note that the period of the call signal of the solid device 7 is determined by the number of relay devices 5, the transfer rate of meter reading data, the memory capacity, etc.

Furthermore, in the relay device 5, the number of terminal devices 4, . . . owned can be increased by the storage capacity of the storage circuit MEM.

Furthermore, the memory circuit MEM may be a random access memory (RAM) instead of using a shift register.

Other Matters It goes without saying that the invention is not limited to the above embodiments, and can be implemented in various modifications without departing from the gist thereof.

As detailed above, according to the method of the present invention, in a device that receives meter reading data randomly generated from a plurality of terminal devices, this receiving device rewrites the meter reading data in response to a call signal from an external device, and When there is no call signal from the external device, this device detects an overflow in the memory circuit, clears the memory circuit at the time set in the device's timer circuit, and rewrites new meter reading data, so this device will not generate data randomly. It is suitable as a receiving device and can receive new meter reading data from a large number of terminal devices even with a small storage capacity.

In addition, new meter reading data can always be stored even if there is no call signal from the external device due to a failure of the external device or a failure of the transmission line, etc. Therefore, from the perspective of a data collection device, new meter reading data can always be collected, increasing the reliability of the device. can be raised.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a system that collects meter reading data, Fig. 2 is a time chart of data exchange in each device in Fig. 1, and Fig. 3 is a block diagram of a device to which the method of the present invention is applied. FIG. 4 is a time chart diagram of the apparatus shown in FIG. 4...Terminal device, 3...Low voltage distribution line,
5... Relay device, 6... Communication line, 7.
...Solid device, 10...Time setting section, 1
1...Relay number setting section, CPL...Coupling circuit, MEM...Memory circuit, OFD...
...Overflow detection circuit, TIM...Timer circuit, CLG...Signal generator, ■NT...
・・・Gate circuit, IDT・・・Verification circuit, DE
M: demodulation circuit, DEC: decoding circuit, MOD: modulation circuit, R8T: reset circuit.

Claims (1)

[Claims] 1 Consists of a plurality of terminal devices, a relay device connected to these terminal devices via a low-voltage distribution line, and an external device connected to this relay device via a communication line, and each of the above terminal devices has a meter reading function. The external device includes a means for randomly sending data to the low-voltage distribution line, and an external device includes a calling signal generating means for sending a calling signal to the communication line, and a meter reading data sent from the relay device in response to the calling signal. In the system, the relay device includes a coupling circuit connected to the low-voltage distribution line, and a coupling circuit connected to the coupling circuit to receive meter reading data sent from the relay device. A demodulation circuit that demodulates, a decoding circuit that is connected to the output terminal of this demodulation circuit and decodes the demodulated meter reading data, and a device that is installed in the demodulation circuit and the decoding circuit to determine whether the meter reading data is normal or not. a data receiving circuit section having a circuit for rejecting meter reading data;
a demodulating circuit connected to the communication line and demodulating a calling signal sent from the external device; a calling signal receiving circuit section having a decoding circuit connected to an output terminal of the demodulating circuit and decoding the demodulated output; It is connected to the output terminal of the decoding circuit of the signal receiving circuit section and checks the decoded call signal with its own number code, and if they match, it sends out a readout signal from the first output terminal, and if they do not match, it sends out the readout signal from the first output terminal. a collation circuit unit that emits a reset signal from the second output terminal; and a first output terminal of the collation circuit unit that stores the decoded meter reading data, which is the output of the decoding circuit of the data receiving circuit unit, in the order in which it was input until it overflows; a memory circuit unit to which a readout control input terminal is connected, reads out the meter reading data in response to a readout signal input to the readout control input terminal, and sends out the meter reading data from the readout output terminal; and a readout output terminal of the memory circuit unit. a gate input terminal is connected to the second output terminal of the verification circuit section, a gate control input terminal is connected to the second output terminal of the verification circuit section, and the gate circuit is opened only during a period in which there is no reset signal input to the gate control input terminal; a data transmission circuit section having a modulation circuit whose input terminal is connected to a gate output terminal of the circuit and whose output terminal is connected to the communication line; and a data transmission circuit section provided incidentally to the storage circuit section and capable of reading meter reading data in the storage circuit section. A first device that clears the memory contents of the storage circuit unit after the data receiving circuit unit has finished, and enables storage of the decoded meter reading data outputted from the data receiving circuit unit thereafter.
an overflow detection circuit that monitors the amount of information stored in the meter reading data in the storage circuit section and outputs a start signal when the amount of stored information reaches the storage capacity of the storage circuit and overflows; a timer circuit that is connected to the output terminal of the circuit and starts a timing operation in response to the start signal and emits a clear signal from the output terminal after counting a predetermined time; and a "clear signal input terminal" that is provided incidentally to the memory circuit section. The output terminal of the timer circuit is connected to the clear signal input from the clear signal input terminal on the condition that the read signal from the first output terminal of the verification circuit section does not arrive within the predetermined time. A random data receiving system characterized by comprising a second clearing circuit that responds to and clears meter reading data stored in a storage circuit section.