JPS586197B2 - Heyretsu code control system Tanmatsu control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention can be used, for example, in an automatic meter reading system for checking the amount of electricity, gas, water, etc. used for each address at the central station without the need for human intervention. The present invention relates to a system capable of controlling installed control equipment such as an alarm switch of an alarm device, an alarm bell, a sprinkler, a shirt shutter, etc.

Automatic meter reading systems, especially parallel code transmission systems,
Only terminal devices such as electric power meters, gas meters, water meters, etc., which are structured to be able to code and transmit measured values for each address in response to commands from a central office, are used to check the measured values each time.

An example of this type of system is shown in FIG.

In FIG. 1, reference numeral 1 denotes a meter reading line, which is composed of a multi-core cable including, for example, a 12-core address selection line L1, a 6-core digit selection line L2, and a 5-core data transmission line L3.

2 is a relay box, which includes an address selection circuit 21 and a digit selection circuit 22.
It has a built-in.

3 is a meter, for example, 31 is a power meter, 32 is a gas meter, and 33 is a water meter.

These devices are provided for each address, and in the embodiment shown in FIG. 1 address and N
o. Only two addresses are shown, especially the latter in a more simplified manner.

The meter reading line 1 is connected to a transmitting/receiving device of a central station (not shown).

An example of the circuit configuration of the relay box 2 and each measuring device 3 is shown in FIG.

The address selection circuit is shown again at 21, and has a selection path consisting of an input terminal 210, inverting amplifiers 211 and 212, a selection switch 213, and an output terminal 214, with the address selection line as described above. Since there are 12 lines, 12 sets of the above-mentioned selection paths are connected in parallel, but only three of them are shown in the figure.

The address selection circuit has the following functions.

That is, when a logic signal "1" is first applied to the input terminal 210, when the switch 213 is in the position shown, the output terminal 214 receives a signal "0" which is the input signal inverted by the inverting amplifier 211. appears.

If the input signal is “0”, the output signal in this case is u1v
becomes.

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 211 and 212, so that a signal with the same logic value as the input signal will appear at the output terminal.

From this, the selection switch 213 inputs "1" to the input terminal.
It has a function to ensure 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 214 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 overall indicates a "0" signal.

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

Therefore, if the selection switch 213 in each selection path is switched on and off in accordance with a predetermined address code, only when a combination signal corresponding to the code reaches the input terminal 210 from the address selection line, the output terminal 214 is 1'' signal is generated.

Next, the digit selection circuit 22 consists of an input terminal 220 and an AND gate 221.

02 circuit, the first digit selection AND gate 2211 outputs an output according to the signals of input terminals 2201 and 2202,
Under the presence of the output of the address selection circuit, the ANDG-2
221 is opened to make transistor 2231 conductive.

Similar operations are performed for other digits.

On the other hand, the measuring instrument 3 is shown as one that emits a 15-digit weighing signal.

For example, three digits are assigned to the area code, and the remaining four digits are assigned to gas, electricity, and water meters, respectively.

This measuring instrument 3 is configured to display the weighing value for each digit as a contact (or non-contact) using, for example, a 5C2 code or a 1248 code with a validity check pit. 223 so that the signal is transmitted to the data transmission line L3.

Diode D is a wraparound prevention diode.

In the conventional device configured as described above, first, an address code signal is sent from the central office via the address selection line L1 of the meter reading line 1.

The address selection circuit 21 for the address of the code receives this signal and prepares to open the AND gates 222 of the digit selection circuits all at once.

A digit selection signal is then sent via the digit selection line L2 to
The C2 circuit determines this and sequentially opens the AND gates 221, and the transistors 223 are sequentially turned on via the AND gates 222.

As a result, a signal indicating the numerical value of each digit is sent to the data transmission line L3.

In such conventional systems, the central station can read the metered values of the electricity meter, water meter, gas meter, etc. of the terminal equipment for each address, but the terminal equipment has an alarm bell switch or a lamp. When there are switches, sprinklers, shutter open/close switches, heating/cooling switches, etc. (hereinafter referred to as control devices), they have the disadvantage that they cannot be controlled from a central station.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of such conventional systems and to provide a system in which terminal control equipment can be operated from a central office using parallel code transmission lines.

Next, the configuration of an embodiment of the present invention will be explained in detail with reference to the drawings.

FIG. 3 shows a block diagram of an embodiment of the present invention, and the same parts as in FIGS. 1 and 2 are given the same reference numerals.

In FIG. 3, a control circuit 4 is connected to at least one arbitrary digit, for example, the n-th digit, of the digit selection circuit 22 of the relay box 2.

The control equipment group 5 is connected to the central office via the control circuit 4 and a data transmission line L3.

The control circuit 4 connects the central office and the control equipment group 5 via the data transmission line L3 when the n-th digit of the digit selection circuit 22 is selected.

As a result, the control equipment group operates by transmitting a control signal from the central station to the data transmission line L3.

A circuit diagram of the control circuit 4 and control equipment group 5 shown in FIG. 3 are shown in FIG.

In FIG. 4, the same parts as in FIG. 2 are given the same reference numerals.

In FIG. 4, reference numeral 223n indicates a transistor provided in the digit selection circuit of the relay box 2 and giving an output to the n-th digit of the measuring instrument 3.

The control circuit 4 connected to this transistor 223n connects the central station 1 and the control equipment group 5 via the data transmission line L3 when the nth digit is selected, and in this connected state, the control circuit 4 connects the central station 1 and the control equipment group 5. A circuit that accepts a control signal transmitted via the data transmission line L3 and provides the signal to the control equipment group; for example, a relay Ry1 connected to the transistor 223n; a relay contact group S1 connecting the control equipment group 5 and the central office 1; It consists of a transistor group T.

The control device group 5 is a circuit that receives control signals from the control circuit 4 and operates each control device, for example, a transistor group T of the control circuit 4.
A group of relays R, 2 connected to each of the relays R, 2 and its contact group S2
It is equipped with

Each contact 821 to S25 of this relay contact group S2 connects the control equipment group 5, such as the alarm lamp 51, alarm bell 52, sprinkler 53, shirt shutter 54, and heating and cooling equipment 55, to a power source.

The central station 1 includes means for releasing the data transmission line L3 when a digit selection code signal for selecting the nth digit is sent to the digit selection circuit of the relay box 2, and a means for releasing the data transmission line L3 after the nth digit selection code signal is sent. As means for transmitting a control signal to the transmission line L3, a contact group S20 and a contact group 810 are provided, which automatically or manually release all of the data transmission line L3.

This contact group 820 is closed when reading a code signal indicating the measured value of the measuring device 3 for each address.

Then, when sending a code signal from the central station 1 to the digit selection line to select the n-th digit connected to the control circuit 4, the contact group S
20 can be opened manually or automatically.

In addition, each of the contact groups SIO is released when a code signal indicating a measured value is sent from the measuring instrument 3 via the data transmission line L3, and each of the contact groups SIO is closed or opened on command. After the n-th digit selection code signal is transmitted and the contact group S20 is opened as described above, one or more contacts are closed.

The operations of the control circuit 4 and the control device group 5 configured as described above will be explained below.

An address code signal is transmitted from the central station 1 via the address selection line, the address of the address code signal is called, and then each digit of the digit selection circuit of the address is selected to perform the weighing of the measuring instrument 3 of that address. The operation of reading the values at the central station 1 is the same as before, and in this case the contact group S2o of the central station 1 is closed.

Next, when a digit selection code is transmitted from the central office 1 via the digit selection line in order to call up the nth digit connected to the control circuit 4 of that address, the nth digit of the digit selection circuit provided in the relay box 2 is transmitted. The second transistor 223n becomes conductive.

At this time, the contact group S20 of the central office 1 is released as described above.

When transistor 223n becomes conductive, relay Ry1 operates to close its contact group S1.

As a result, the control equipment group 5 and the central office 1 are connected via the data transmission line L3.

At this time, in the central station 1, since all of the contact groups 8107S20 are open, the selection of the n-th digit will not cause reading errors at the central station, and the transistor group T of the control circuit 4 will operate. There isn't.

After the contact group S1 is closed by the operation of the relay R,1, the transistor group T is operated by closing the contact group SIO in the central office 1.

For example, if 81A of the contact group 810 is closed, a voltage is applied to the base of the transistor T1, and the transistor T
1 is conductive.

This activates the relay Ry2-1 connected to the collector of the transistor T1, closing its contact S21.

As a result, the alarm lamp 51 lights up.

Similarly, each device of the control device 5 operates by closing each contact of the contact group 810 at the central station 1.

In the above description, the case where only one control circuit 4 is provided for each address has been described, but any number of control circuits 4 may be provided for each address as necessary.

According to the present invention as described above, the control equipment group installed in the terminal equipment section for each address is connected to the central station via the data transmission line, and the central station transmits the control signal to the data transmission line. A control circuit connected to at least one arbitrary digit of the digit selection circuit for each address opens and closes the connection between the central station and the control equipment group, and also accepts control signals from the central office to select the control equipment. By controlling the group, it is possible to transmit data from the central office side to the data transmission line, compared to conventional equipment that could only transmit signals in one direction from the terminal equipment side to the central office side via the data transmission line. It has the advantage that control signals can be transmitted to terminal equipment, particularly control equipment, via the data transmission line, and bidirectional signal transmission can be performed using the data transmission line.

[Brief explanation of the drawing]

1 and 2 show a conventional device, FIG. 1 being a block diagram thereof, and FIG. 2 showing a circuit diagram of FIG. 1. 3 and 4 show an embodiment of the present invention, with FIG. 3 being a block diagram thereof, and FIG. 4 showing a main part circuit diagram of a control circuit and a control equipment group. 1: Meter reading line, 2: Relay box, 21: Address selection circuit, 2
2: Digit selection circuit, 3: Terminal equipment, 4: Control circuit, 5: Control equipment group, 51: Alarm lamp, 52:
alarm bell, 53: sprinkler, 54: shutter, 5
5: Air conditioning equipment, Ry: Relay, T: Transistor,
L1: address selection line, L2: digit selection line, L3: data transmission line, S1: second control switch group, S2: first control switch group, SIO: fourth control switch group, S20
: Third control switch group.

Claims (1)

[Claims] 1. An address selection circuit and a digit selection circuit are installed between a central station having a transmitting device and a data receiving device for address selection code signals and digit selection signals, and a terminal device equipped with a measuring instrument structured to code and transmit measured values. A relay box with a central The station transmits the address code signal of each relay box to the address selection circuit of each relay box via the address selection line, and then transmits the digit selection signal to the digit selection circuit of each relay box via the digit selection line; Each terminal device connected to the selected relay box transmits the weighing value in correspondence with the digit selection signal to the central station via the data transmission line, and a control device is attached to the terminal device section for each address. A control equipment group is installed in which at least one arbitrary digit of the digit selection circuit is assigned to the control equipment group, and the relay box is connected to a data transmission line and receives a control signal from the central station transmitted via the data transmission line. A first control switch group that is controlled to control the control equipment group, and a first control switch group that is connected between the first control switch group and the plurality of data transmission lines, and that is closed by a digit selection signal assigned to the control equipment group. A third control switch group is provided at the central station to release the data transmission line from the data receiver in conjunction with the transmission of the digit selection signal assigned to the control equipment group. 1. A control system for terminal control equipment using a parallel code transmission method, characterized in that a data transmission line is provided with a fourth control switch group that transmits control signals for the first control switch group.