JPS5812637B2 - Heiletsu code system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a parallel code transmission system for checking the usage of water, gas, electricity, etc. at a central office without requesting access.

In order to perform automatic meter reading, methods have been proposed that employ a power line transport method or use dedicated lines to transmit data in series and in parallel.

In the case of the power line transport method, the transmitter/receiver device made of semiconductors (■C, transistors, etc.) is exposed to the risk of being destroyed by abnormal voltage from the outside, so in order to solve this problem, the transmitter/receiver device is expensive. 5. It becomes complicated.

Furthermore, when serially transmitting data using a dedicated line, the transmitting/receiving device becomes complicated and costs increase.

On the other hand, the method that uses dedicated lines to transmit data in parallel requires a large number of dedicated lines, but compared to the first two,
The transmitting/receiving device can have a simple configuration.

As a system for transmitting data in parallel using the above-mentioned dedicated line, the system shown in FIGS. 1 and 2 has already been proposed.

In FIG. 1, 1 is a meter reading line, which is composed of an address selection line L1, a digit selection line L2, and a data transmission line L3.

The relay box 2 includes an address selection circuit 21 and a digit selection circuit 22, and this relay box is installed in each household.

For example, when there are 12 address selection lines L1, 12 sets of address selection circuits 21 are connected in parallel to the relay box 2.

The digit selection circuit 22 consists of a combination circuit of signals sent via the digit selection line L2, and outputs in the presence of the output of the address selection circuit 21.

3 is a terminal equipment meter, which includes a power meter 31 and a gas meter 32.
, water meter 33.

This meter 3 emits a 15-digit measurement signal, and the digits are electric power,
Arbitrarily assigned to gas and water meters.

Each measuring signal of which measuring device 3 is connected to be transmitted to the data transmission line L3.

The meter reading line 1 is connected to a transmitter/receiver of a central station (not shown).

In the device configured as described above, first, an address code signal is sent from the central office via the address selection line L1, and the address selection circuit for the code is connected to the central office.

Next, a digit selection signal is sent via the digit selection line L2, and based on the judgment of the digit selection circuit, a data signal indicating the numerical value of each measuring instrument is sent to the data transmission line L3.

However, as shown in FIG. 2, each digit that emits a data signal indicating the measured value of the terminal measuring device 3 of the above-mentioned device has a wraparound prevention diode D that prevents the reverse flow of the data signal. If the 3rd digit diode D4 is damaged, the current flowing through the 2nd digit diode D4 is divided into the normal current shown by the solid line arrow and the abnormal current passing through the 3rd digit diode D4 as shown by the broken line arrow. The data signals of the systems become confused and unreadable, and furthermore, it becomes impossible to read the data signals of all systems.

In addition, as another conventional device, when a large number of measuring instruments are concentrated in one place, the large number of measuring instruments are divided into groups of a predetermined number, and a predetermined number of code transmitters are sent to the corresponding measuring instruments in each group. There is also one that is commonly connected to the scale and reads the indicated value of the measuring instrument by activating the code transmitter.

This device sequentially selects one group from the central station and reads the indicated values of the measuring instruments in the group sequentially through each of a predetermined number of code transmitters, thereby reducing the number of types of code transmitters. can.

However, the failure of one code transmitter makes it impossible to read the scales of all groups commonly connected to that code transmitter, and the failure of that code transmitter affects all groups.

The present invention eliminates the drawbacks of conventional devices as described above,
It is desired to minimize the range of influence that the data signal indicating the measured value of the terminal measuring device has on the grid due to breakage of the wrap-around prevention diode, and the number of repeaters with the same code signal is the same as the number of group selectors. The purpose is to further reduce the number of needle-reading lines.

Next, the configuration and operation of the present invention will be explained in detail based on the drawings showing an example of the present invention.

3 to 3, the same parts as in FIG. 1 are given the same reference numerals.

FIG. 3 shows an embodiment of the present invention, in which numeral 40 indicates a central station equipped with a transmitter/receiver, and numeral 50 indicates one relay box for each group of relay boxes 2 that are arbitrarily grouped according to medium-to-high-rise residences or regions. The figure shows a group sorter installed in each group, and is installed between the central station 40 and the relay box 2 for each group.

Similar to the conventional device, the relay box 2 is operated by an address code signal sent from the central station 40 via the address selection line L1 of the meter reading line 1, but in the present invention, the relay box 2 is operated by the corresponding relay box 2 for each group. (For example /l6.l-1,4
2-1 2-..., An-1, /162-2
2-2 An-2, . . . ) use the same address code signal.

In addition, a group sorter 5 is installed for each group.
The same address code signal as the address code signal of relay box 2 of each group is used as each selection code signal of 0 (for example, group selector /161 and relay box 7F6).
1-1・應2-1・・・・・・A n-1, Group sorter 2 and relay box 1-2・A2-2・・・・・・
An-2,...).

If the group sorter 50 and the relay box 2 have the same address code signals, the central station 40
Depending on the address code signal transmitted from the meter line 1 through the meter reading line 1, the group sorter and relay box for the address code signal may operate simultaneously.

To this end, in this embodiment, one signal line, ie, a lock line 12, is added to the meter reading line 1, which is commonly connected to the central office 40 and the group sorter 50.

A logic signal is sent to this lock line 12 from the central station 40 to indicate "O".
When the signal ``1'' is applied, the group selector 50 is placed in the "unlocked state", and when the signal ``1''' is applied, the group selector 50 is placed in the "locked state".

A circuit diagram of the aforementioned group sorter 50 and an address selection circuit diagram of the relay box 2 are shown in FIG.

The selection circuit of the group selector is shown again at 50;
This circuit includes an input terminal 51, inverting amplifiers 52 and 53,
It has a selection path consisting of a selection switch 54 and an output terminal 55, and for example, the address selection line L1 of the meter reading line 1 is 6.
If there are multiple selection paths, six sets of the above-mentioned selection paths are connected in parallel.

Only three of them are shown in the figure.

It also has an input terminal 510 that receives a lock signal transmitted via the lock line 12 disposed between the central station 40 and each group sorter 50, an inverting amplifier 56, a relay starting circuit 57, and a self-holding function. It has a relay 58 and a group of relay contacts 59.

The group selection function is accomplished as follows.

That is, when a logic signal of "1" is first applied to the input terminal 51, when the switch 54 is in the position shown in the figure,
At the output terminal 55, a signal "0" obtained by inverting the input signal by the inverting amplifier 52 appears.

If the input signal is "0", the output signal in this case is "1"
It is.

If the switch is connected in the opposite way as shown, the input signal will be guided to the output terminal through the two inverting amplifiers 52 and 53, so that a signal with the same logic value as the input signal will eventually appear at the output terminal.

From the above, the selection switch 54 selects "1" from the input terminal.
It has a function of ensuring that a signal of "1" always appears at the output terminal when either a signal of "" or "0" arrives.

On the other hand, since the output terminal 55 has a form in which the outputs of each selection path are commonly connected, if any one of the output signals of each selection path corresponds to a "0" signal, the output of the other selection path Even if the output signal indicates a "1" signal, it will collectively indicate a "0" signal.

That is, it can have a well-known AND circuit-like function.

Therefore, if the selection switch 54 in each selection path is switched and connected in accordance with a predetermined code, only when the combination signal corresponding to the code arrives from the household selection line to the input terminal 51, the output terminal 55 will be 1'' signal is generated.

However, this is not the only condition that causes a "1" signal to appear at output terminal 55.

That is, the remaining condition must be that the signal led to the input terminal 510 via the lock line 12 passes through the inverting amplifier 56 to provide a "1" signal.

If the signal led through the lock line is "1", the output signal of the inverting amplifier will be "0", which means "lock state".

On the other hand, if the signal led through the lock line is 101, the output signal of the inverting amplifier will be "1", which means "unlocked state".

Therefore, when a predetermined own address code signal is sent from the central station 40 to the group sorter 50, if a "0" signal is given to the input terminal 510 via the lock line 12, the relay is activated. A "1" signal is applied to the circuit 57 by the above-mentioned AND/direction function of the selection path, which activates the relay coil of the relay 58 and closes its contact group 59. After this, the relay 58 self-maintains its operating state. do.

Therefore, the relay box 2 and the central office 40 in this group are connected.

The self-holding of this relay 58 is canceled by the central station and the relay 58.
It can be released from the central station using the self-hold release line connecting the .

It is also possible to notify the central office that the group sorter has operated by closing the contacts 59 of the relay 58.

Contrary to the above, to set the "locked state", connect the lock line 12.
A signal “1” is given to the input terminal 510 via
This signal is inverted by an inverting amplifier 56 to become an "O" signal, and a "0" signal is given to a relay activation circuit 57.

Therefore, even if the address code signal is applied to the group selector 50, the “0” signal is sent via the lock line 12.
” signal, the group selector will not operate.

In FIG. 4, only the address selection circuit of the relay box 2 is shown, but since this circuit is the same as the selection path of the group selector 50, a description thereof will be omitted.

In the system configured as described above, the fact that the same address code signal can be used for each group sorter and each relay box will be explained below.

First, for example, from the central station 40, No. An address code signal is sent to select one group sorter, and No. The selection path of the group 1 sorter is activated, a "0" signal is applied to the lock line 12, and a "1" signal appears at its output terminal 55.
The relay box in the /l61 group and the central station 40 are contact group 5.
Assume that the relay 58 maintains its operating state by being connected by the terminal 9.

Next, relay boxes are selected one after another from the central station 40, and a code signal indicating the measured value of the measuring device for each address is sent to the central station 40. Even if the address code signals are the same, for example, when selecting the A61-2 relay box from the central office, the selection path of the loop selector operates, but the selection path of the loop selector operates when selecting the A61-2 relay box from the central office, which has the same address setting code. After the /l61 group selector is selected, the "1" signal is applied to the lock line 12, so the "O" signal appears at the output terminal of the /l62 group selector, and therefore the /l61 group selector is selected. Only the I61-2 relay box will be selected.

Further, when selecting another relay box, the selection operation is performed in the same manner as described above.

After this, to release the self-holding of the 41 group sorter,
This can be done from the central station using a self-hold release line (not shown).

．． Further, as in the previous embodiment, another embodiment is shown in FIG. 5 in which the same address code signal can be used for the group selector and the repeater for each group.

In Figure 5-2), the same parts as shown in Figure 4 are given the same reference numerals, and the difference from the embodiment shown in Figure 4 is the inverting amplifier of the group selector. 56 is replaced by an amplifier 520, a signal line or control line 13 commonly connected to the group sorter is provided between the central station 40 and each repeater 2, and the control line 13 is connected to each repeater 2. It has an input terminal 215 and an inverting amplifier 216 as a selection path for selecting a control code signal sent from the central office 40 via the input terminal 215.

The output side of this inverting amplifier 216 is connected to the output terminal 214.

In this embodiment, a transistor 517, for example, is shown as the relay activation circuit.

A logic signal of "1" or "0" is applied to the control line 13 from the central station 40.

The group selector is called by giving a "1" signal to the control line 13, and the repeater 2 is called by giving a "0" signal.

The operation of the embodiment configured as described above will be explained below.

First, a "1" signal is transmitted from the central office to the control line 13 to operate the control code signal selection path of the group selector 50, and an address code signal is sent to call the group selector via the address selection line L1. will be sent.

A "1" signal appears at the output terminal 514 of the selection path of the group selector 50 for this address code signal, activating the transistor 517.

This activates the relay coil of relay 518 and closes contact group 519 of relay 518.

By closing this contact group 519, the relay box 2 is connected to the central office.

The relay 518 has a self-holding circuit, and maintains its operating state by actuation of the relay coil. Hold.

The self-holding state of the relay 518 is released by providing a signal line between the central office and the group selector 50 and applying a self-holding release signal to the relay 518 from the central office.

Furthermore, in order to confirm at the central station that the group selectors 5 and 0 have been selected, it is possible to inform the central station that the group selectors 5 and 0 have been selected by closing the contact group 519 of the relay 518. Similar to the example.

Next, the control code signal 10'' is sent from the central station to the control line 13.
The address code signal of the repeater to be called is sent to the address selection line L1.

The address code signal is transmitted to the relay box through the selected group sorter 50. A "1" signal appears on the output side of the control selection path 2, thereby making it possible to read the measured values of the measuring instruments connected to the relay box 2 for each address.

Thereafter, the measured values of the scales can be sequentially read from the central station according to a predetermined procedure.

When selecting the relay box 2 from the central station, the selection path of the group thickness separator 50 for the same address code signal. Also on the output side of
” signal can be given, but since the output side of the control code selection path of the group selector becomes a “0” signal, the output of the selection path of this group selector ends up being the output of the control code selection path of the group selector. The power terminal 514 becomes "0" and the group sorter 50 does not operate.

Further, the relay boxes 2 having the same address code signal other than the relay box 2 in the group of the selected group sorter 50 do not operate because they are separated from the central office 40 by the relay contact group 519 of the group sorter 50.

As described above, the present invention is installed between a central station equipped with a transmitting/receiving device and a terminal device such as a measuring instrument that can encode and transmit a measured value provided for each address, and is capable of discriminating address code signals. In a device in which a relay box is connected to a central station via a multicore cable consisting of an address selection line and a data signal line, the relay boxes are grouped, and a relay box is provided between each group and the central station. A group sorter is installed, and a lock line, a self-hold release line, and a common address selection line corresponding to the number of codes are connected between the central station and each group sorter, and a relay box corresponding to each group is connected. The same address code signal is used for each of the group sorters, and the same address code signal as one of the address code signals of each relay box is used as the selection code signal of each group sorter. means for selecting its own selection code signal, which connects all relay boxes in the group to the common address selection line and data signal line using the output of the means, and then holds the relay box self-holding, and releases the holding code from the central station. a connecting means for releasing self-holding by a release signal applied via a line; and a locking means connected to the lock line and locking the connecting operation of the connecting means by a lock signal applied from a central station via the lock line. and means for sending a selection code signal of each group selector to the address selection line to the central office; means for sending a lock signal to the lock line after sending the selection code signal; By providing means for sending an address code signal of each repeater to the address selection line, and means for sending a release signal to the self-hold release line after receiving the data signal from the relay box, the following advantages can be obtained. has.

1) If the number of households targeted for meter reading is constant, the number of selected meter reading lines can be reduced.

For example, when reading meters for 4,096 households, if only a relay box is used, 12 address selection lines are required, but if a group sorter is used, only 6 address selection lines are required.

2) When the system is in operation, only the repeaters selected via the group selector are in the selected operating state, so the power supply capacity can be reduced.

3) By insulating between the central station and the relay box, locations of insulation breakdown due to external abnormal voltage can be minimized, providing an insulation protection effect.

4) Relay boxes with the same code signal can be manufactured in the same number as the number of groups, allowing for standardization and rationalization of relay boxes.

5) The opening/closing connection means of the group sorter makes it possible to minimize the influence of short circuits caused by damage to the prevention diodes caused by the terminals wrapping around the terminals, thereby facilitating maintenance and inspection.

[Brief explanation of drawings]

Figures 1 and 2 show the system of the conventional device;
The figure shows the block diagram, and FIG. 2 shows the circuit diagram of the terminal wraparound prevention diode. 3 and 4 show an embodiment of the present invention, FIG. 3 is a block diagram thereof, and FIG. 4 is a group sorter and . FIG. 3 is a circuit diagram showing the selection path of the relay rod. FIG. 5 is a circuit diagram showing another practical example of the present invention. 1: Meter reading line, 2: Relay box, 3: Measuring instrument, 40: Central station,
50: group selector, 12: lock line, 13: control line, L1: address selection line, L2: digit selection line, L3: data transmission line, 54: selection switch, 57, L17: relay starting circuit, 58. 518: Relay, 59, 519: Contact group of the above relay.

Claims (1)

[Claims] 1. A relay box that is installed between a central station equipped with a transmitting/receiving device and a terminal device such as a measuring instrument that can encode and transmit the measured value provided for each address, and is equipped with a means for determining address code signals. is connected to the central station via a multicore cable consisting of an address selection line and a data signal line, the relay boxes are grouped, a group sorter is installed between each group and the central station, and the central A lock line, a self-hold release line, and a number of common address selection lines corresponding to the number of codes are connected between the station and each group selector, and the same address code signal is used for each relay box corresponding to each group. At the same time, an address iodine signal that is the same as one of the address code signals of each relay box is used as the selection code signal of each group sorter, and each group sorter is connected to the address selection line and transmits its own selection code signal. means to choose,
connecting means for connecting all the relay boxes in the group to the common address selection line and data signal line by the output of the means and then making the self-holding connection, and releasing the self-holding by a release signal from the self-holding release line; locking means connected to a locking line and locking the connecting operation of the connecting means by a locking signal applied from a central station via the locking line;
means for sending a selection code signal of each group sorter to the address selection line to the central station; means for sending a lock signal to the lock line after sending the selection code signal; and means for sending the address selection signal to the lock signal transmission period. A parallel code transmission system comprising means for sending an address code signal of each repeater to the line, and means for sending a release signal to the self-hold release line after receiving the data signal from the relay box. .