JPS6022399B2 - Data collection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data collection method that uses a power distribution system to call terminal devices from a central device via a relay device to collect data on meter readings of customers.

Conventionally, in a system that uses the power distribution system as a transmission path and collects data on meter readings from customers by calling terminal devices from a central device via a relay device, the central device first calls the desired relay device with a call signal, and then the relay There is a system in which a device sequentially calls terminal devices, receives their data signals, and sends them back to a central device. However, in such a conventional relay device, since a special device such as a scanning device is required to sequentially call the terminal devices, the circuit configuration becomes complicated and the stability of operation is affected. Further, when a terminal device, that is, a customer changes, this must be determined from the relationship with the relay device, which is not desirable from the viewpoint of data collection management.

The present invention has been made in view of the above circumstances, and the circuit configuration of the relay device is simple, which improves the stability of operation.In addition, the total transmission power to the terminal side can be reduced. The purpose is to provide a data collection method that can also facilitate the management of transfers.

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

That is, FIG. 1 shows a system configuration diagram according to the present invention, and CE in the figure is a central device installed in a business office or the like, and includes a central processing unit, a transmitting/receiving device, etc. therein. A relay device REP is connected to the central device CE via a transmission line made up of communication lines or high-voltage distribution lines L to L of a power distribution system. Usually, the relay device REP is provided in pair with a pole transformer. In this case, the relay device REP is grouped into one line for each predetermined group, and the illustration shows a case of four lines, lines L, to L4. Among the relay devices in relay group 1, REP has a plurality of customers, that is, terminal devices NO. 1~NO. 5.No. 6~No. 9
Connect. In this case, terminal device No. 1~No. 9 is 1
one terminal group G. At the same time, as shown in Figure 2a, each terminal is assigned a unique address of several digits, and the upper four digits (1st to 1st digits) of this unique address are assigned to the terminal group. address and at the same time allocate line L. That is, for example, the line L is assigned to a group of terminals with addresses 0001 to 0025. For convenience, the terminal group (G
, ) is set to 0025. Therefore the central unit CE
When calling the terminal device SU old via the relay device REP, the calling signal is an address corresponding to the terminal group. For example, as shown in Figure 2b, the upper four digits of the six digits of the terminal unique address are used as the terminal group address. , and the terminal device SU
The response from B, ~SUB9, that is, the response signal uses the remaining two digits of each terminal's unique address, that is, the lower two digits, and the four digits of the meter reading value, as shown in Figure c. Next, a specific example of the relay device REP will be explained according to FIG. 4. INT is an interface circuit connected to the communication line (or high voltage distribution line) on the central device CE side, and CPL is connected to the low voltage distribution line on the terminal device SUB side. In the low voltage coupling circuit, these circuits INT and CPL are always in the receiving state, but are inverted to the transmitting state after receiving a carrier wave detection signal, which will be described later. BPF, , BPF2 are radio wave signal detection circuits, of which the detection circuit BPF generates a carrier wave detection signal to the low voltage coupling circuit CPL when receiving a call signal from the central unit CE via the interface circuit INT. After removing noise from the calling signal, it is applied to the low voltage coupling circuit CPL through the amplifying circuit AM and sent to the terminal side, and the detection circuit BPF2 receives the signal from the terminal device SUB via the low voltage coupling circuit CPL. When the response signal is received, it generates a carrier wave detection signal to the interface circuit INT, and after removing noise from the response signal, it is applied to the interface circuit INT via the amplification circuit AMP2 and sent to the central device CE side. Further, a specific example of the terminal device SUB will be explained according to FIG.
L is a low-voltage coupling circuit connected to the low-voltage distribution line on the relay device REP side, DEM is a demodulation circuit that demodulates the call signal given via the low-voltage coupling circuit CPL into an input code, and TIM is a logic circuit based on the input code of the demodulation circuit DEM. This is a timing circuit that generates a system timing clock signal, and the startup time is set in advance for each terminal.

REG is a storage circuit that temporarily stores the input code of the demodulation circuit DEP, and DET is a storage circuit in which an address corresponding to the terminal group to which it belongs, for example, 0025, is set in advance, and this and the storage device RE
A decoupling determination circuit that compares the contents with G and generates an output if the corresponding address and the contents of the storage circuit REG do not match.
RES is energized by the output of the decoupling judgment circuit DET and a scan completion signal of the scanning device SCN, which will be described later, and is connected to the storage circuit RE.
G and a reset circuit that provides a reset signal to the scanning circuit SCN, SCN is a scanning circuit that is activated at a time preset in the timing circuit TIM, and the encoding circuit ENC performs encoding on the condition that there is no reset signal from the reset circuit RES. The encoded unique address of the own end, for example 01, and the meter reading value are scanned and sent to the modulation circuit MOD. Modulation circuit MOD
modulates the code string of the address and meter reading value from the encoding circuit ENC and sends it as a response signal to the relay device side via the low voltage coupling circuit CPL. Next, to describe the operation of the present invention configured as described above, the central equipment CE now sends a message to a terminal group (G,) of a certain unique address on a certain line, for example, a terminal group (G,) of 0025 on line L, as shown in FIG. 2b. Call signal 0025 is the third
If it is sent as shown in Figure a, then all repeaters REP
As shown in FIG. 4, the band hearth wave signal detection circuit BPF receives a calling signal via the interface circuit T, sends a carrier wave detection signal to the low voltage coupling circuit CPL, inverts it to the transmitting state, and calls. After noise is removed from the signal, it is applied to the low voltage coupling circuit CPL via the amplifier AMP and sent to the terminal device SUB on the low voltage distribution line side.

That is, a calling signal as shown in FIG. 3b is sent from all the relay devices REP connected to the line L to all the terminal devices SUB connected thereto. Then, in this case, the unique address 00
In each terminal device SUB of the terminal group that does not correspond to 25, the 5th
As shown in the figure, the demodulation circuit DE is connected via the low voltage coupling circuit CPL.
The input code demodulated by M is once stored in the storage circuit REG and then checked against a preset absolute address in the decoding determination circuit DET, but since it is determined that the two do not match, a reset signal is issued from the reset circuit RES. Everything will be reset. On the other hand, each terminal device No. of the terminal group (G,) corresponding to the unique address 0025. 1~No. 9, as described above, as shown in FIG. 5, the input code demodulated by the demodulation circuit OEM is once stored in the storage circuit REG, and then the decoupling judgment circuit DET compares it with the preset terminal group address. Therefore, the timing circuit T
The scanning circuit SCN is activated at a time preset in M, and the encoded individual address (lower two digits) and meter reading value from the encoding circuit ENC are given to the low voltage coupling circuit CPL via the modulation circuit MOD. It is sent to the relay device REP as a response signal shown in FIG. 2c. FIG. 2c shows terminal device No. 1 response signal is shown. That is, when the terminal group corresponding to the group address determines the paging signal, each terminal group sends a time-divided response signal as shown in FIG. 3c at the timing according to the setting of the timing circuit TIM. 1 terminal, No. 2 terminals...No. 9 terminals are generated in this order, and sent back to the central equipment CE via the relay device REP as shown in FIG. 4d. As a result, the central device can sequentially collect data from each terminal device at predetermined intervals. Thereafter, calls are made to other terminal groups and terminal groups on other lines in the same manner, and data collection is performed.

Furthermore, due to a change in the power distribution system, the terminal No. that was originally connected to the repeater (REP) was changed. 6~NO. 9 is a repeater (REP)
4) Even if the connection is changed to
25, each terminal will respond in the same way as before the connection change.

According to the present invention, the central device CE calls the terminal device SUB via the relay device REP using the power distribution system to collect meter reading data from customers. A unique address is assigned to each terminal device, and the upper digits of this unique address are assigned to the terminal device, the remaining digits are assigned to individual terminals within the terminal group, and in the case of a call from the central device CE, the address corresponding to the terminal group is assigned. is used as a call signal, and on the other hand, in response from each terminal, each terminal sends the individual address and meter reading value as a response signal to the central device CE in a time-sharing manner, which speeds up meter reading and also reduces relaying. The device REP simply operates as a simple multiplier (or involves frequency conversion) that relays the call and response of the terminal, so the circuit configuration is simplified and the stability of operation is improved accordingly. Furthermore, since these relay devices REP are grouped into relay groups for each line and a call is made for each line, the total transmission power to the low voltage side can be reduced.

Furthermore, since the terminal device SUB, that is, the customer, has a unique address, it becomes easy to manage changes in the customer.
As explained above, according to the present invention, the circuit configuration of the relay device is simple, and the stability of operation can be improved accordingly.
In addition, it is possible to provide a highly reliable data collection method that can reduce the total transmission power to the terminal side and that can extremely easily manage changes in customers.

[Brief explanation of drawings]

Fig. 1 is a system configuration diagram showing an embodiment of the data collection method according to the present invention; Fig. 2 is a data format diagram used in the embodiment; Fig. 3 is a time chart for explaining the embodiment; 4 is a block diagram showing a specific example of the central device used in the same embodiment, and FIG. 5 is a block diagram showing a specific example of the terminal device used in the same embodiment. CE...Central device, REP ...Relay device, SU
B...Terminal device, INT...Interface circuit, CPL...Low voltage coupling circuit, BP
F,, BPF2...Band reactor wave signal detection circuit, A
MP,, NMP2... Multiplier, OEM... Demodulation circuit, TIM... Timing circuit, REG...
...Storage circuit, DET...Decoding judgment circuit,
RES...Reset circuit, SCN...
Scanning circuit, ENC... Encoding circuit, MOD...
...Modulation circuit. Napu Sardine Mekumo Game J■ 〆〆〆〆〆〆〆〆〆Sardine〆J■

Claims (1)

[Claims] 1. Using the power distribution system as a transmission path, the central device calls a plurality of terminal devices provided for each customer via a relay device, and each terminal device sends meter reading data back to the central device. In a data collection method for collecting meter reading data of customers, the central equipment is grouped into a relay group for each line to be called for each line, and the plurality of terminal devices are divided into terminal groups and each terminal device is individually numbered. with a unique address of the digit,
The upper digits of this unique address are assigned to the terminal group as the terminal group address, and when the central device calls, the address corresponding to the terminal group is used as a calling signal, and when the terminal device responds, each unique address is used. The remaining lower digits and the meter reading data are used as response signals, and each terminal device is provided with the following configuration requirements (a) to (h), and a call is made between the central device and each terminal device. A data collection method characterized by collecting meter reading data of a consumer of a terminal device according to a signal, (a) a demodulation circuit that demodulates the call signal into an input code. (b) a timing circuit that is connected to the output terminal of the demodulation circuit and outputs a clock signal at a timing preset for each terminal device when the demodulated input code is added; (c) a timing circuit that is connected to the output terminal of the demodulation circuit; (d) a memory circuit connected to the output terminal and storing the input code; (d) an address corresponding to the terminal group connected to the output terminal of this memory circuit and to which it belongs is set; (e) a combination determination circuit that compares with the terminal group address and determines whether or not the contents match; (e) a combination determination circuit connected to the timing circuit and activated by a timing clock signal outputted; (f) a scanning circuit that scans to output the unique address of its own terminal and the meter reading value on the condition of a judgment output signal indicating that the terminal group address and terminal group address match; (f) a unique address connected to this scanning circuit and scanned; and an encoding circuit that encodes meter reading values,
(g) a modulation circuit connected to this encoding circuit, which modulates the encoded code string of the encoded unique address and meter reading value and returns it as a response signal to the relay device side; (h) an output terminal of the decoding determination circuit; An input terminal is connected to an output terminal of a scanning circuit, and a reset signal is generated based on a judgment output signal indicating that the storage contents of the storage circuit do not match the terminal group address and a scanning completion signal of the scanning circuit, and this reset signal is transmitted to the storage circuit. Reset circuit for circuit and scanning circuit.