JPH08251680A - Control communication equipment for air conditioner - Google Patents

Abstract

PURPOSE: To obtain a control communication equipment for an air conditioner capable of executing non-polarity/bidirectional data transmission while supplying power from a master equipment to a slave equipment by simplifying circuit constitution and using a common communication line and a power supply line. CONSTITUTION: A master equipment 1 is connected to respective slave equipments 2 through two transmission lines 4 and the master equipment 1 is provided with a means for superposing an ON/OFF signal with a prescribed amplitude level (+7V) to a prescribed DC voltage level (+5V) under control by a monitor and control means (CPU 1-7), transmitting the superposed signal and receiving a signal from the slave equipment 1 through a signal polarity matching circuit 1-5. Each slave equipment 1 is provided with a means for receiving the signal from the master equipment 2 through the circuit 1-5, differentiating the ON/OFF signal with the prescribed amplitude level (+7V) from the DC voltage with the prescribed level (+5V), utilizing the DC voltage of the prescribed level as power supply for the slave equipment 1 itself, and transmitting an ON/OFF signal with a prescribed amplitude level (+12V) to the master equipment 2 through a signal polarity matching circuit 2-1 under control by a control means (CPU 2-5).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control communication device for an air conditioner used in an air conditioner.

[0002]

2. Description of the Related Art As shown in FIG. 6, an air conditioner body 31,
The air conditioner main body 31 is provided with a master unit 32 having a monitor control unit and a plurality of slave units 33-1, 33-2, 33-3 connected to the master unit 32 by a transmission line 34. , A human transmits operation, stop, and setting information of the air conditioner main body 31 to the master 32 by operating the slaves 33-1, 33-2, 33-3, and from the master 32, the air conditioner main body 31. When the current state of the device is transmitted to the child devices 33-1, 33-2, 33-3 and is displayed there, the parent device 32 and the child devices 33-1, 33-3
-2, 33-3 must be exchanged with the data.

Conventionally, as a technique for exchanging data of this type, there is one disclosed in Japanese Patent Application Laid-Open No. 56-155326. According to the technique, a plurality of units are connected by a pair of control signal lines, the pair of control signal lines are also used as a power supply line to a unit that does not include a DC power source, and a terminal for connecting a pair of control signals of the unit. A circuit for depolarizing the signal is provided and signals are transmitted and received using tone burst signals.

[0004]

However, since the above technique uses tone burst signals for transmitting and receiving signals, there is a problem that a high frequency circuit is required and the circuit configuration becomes complicated.

The present invention has been made in view of the above-mentioned points, and does not require a high frequency circuit for tone burst signals, has a simple circuit configuration, uses a common communication line and power line, While supplying power to the slave unit,
An object is to provide a control communication device of an air conditioner that can perform bidirectional data transmission.

[0006]

In order to solve the above problems, the present invention is directed to an air conditioner main body, a master unit having monitor control means for monitoring and controlling the air conditioner main unit, and the master unit connected by a transmission line. A plurality of slave units having control means for transmitting and receiving signals to and from the master unit, and transmitting various signals from the slave unit to the master unit and transmitting various signals from the master unit to the slave unit; In a control communication device for an air conditioner configured to display the various signals on a master unit, two transmission lines are used for the transmission line connecting the master unit and the slave unit, and the polarities of the signals are respectively applied to the master unit and the plurality of slave units. Is provided with a signal polarity matching circuit, and the master unit transmits a transmission signal in which an ON / OFF signal of a predetermined amplitude level is applied to a predetermined DC voltage level under the control of the monitor control means, and a signal from the slave unit. For receiving through the signal polarity matching circuit A slave unit receives a transmission signal from the master unit through a signal polarity matching circuit, discriminates an ON / OFF signal having a predetermined amplitude level from a DC voltage having a predetermined level, and outputs a DC voltage having a predetermined level to the slave unit. Is used as a power source for the power source, and the predetermined amplitude level is turned on by the control of the control means.
-A means for transmitting an OFF signal to the master unit through a signal polarity matching circuit is provided.

[0007]

According to the present invention, by adopting the above-mentioned configuration, the master unit and the slave unit transmit the signal polarity matching circuit, and the master unit transmits the transmission signal in which the ON / OFF signal of the predetermined amplitude level is applied to the predetermined DC voltage level. In addition, the signal from the slave unit is received through the signal polarity matching circuit, the slave unit receives the transmission signal from the master unit through the signal polarity matching circuit, and an ON / OFF signal of a predetermined amplitude level and a DC voltage of a predetermined level are received. , The DC voltage of a predetermined level is used for the power supply of the slave unit, and the ON / OFF signal of a predetermined amplitude level is transmitted to the master unit through the signal polarity matching circuit. Turn on DC without needing
With a simple circuit configuration based on the OFF circuit, non-polarity / bidirectional data transmission can be performed while the communication line and the power supply line are shared and the master unit supplies power to the slave unit.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration example of a control communication device of an air conditioner. In this control communication device, a master device 1 and a plurality of slave devices 2 are connected by a transmission line 4. The transmission line 4 is composed of two transmission lines although not shown.

The base unit 1 has a power source 1-1 and an impedance (Z
0) 1-2, diode 1-3, converter 1-4, signal polarity matching circuit 1-5, signal detection circuit 1-6, CPU 1-7
And an input / output device (I / O) 1-9, and is connected to the main body 3 of the air conditioner via the input / output device 1-9.
The slave unit 2 includes a signal polarity matching circuit 2-1 and a voltage stabilizing circuit 2-.
2, signal detection circuit 2-3, amplification circuit 2-4, CPU2-
5, input / output device (I / O) 2-6 and input display device (S
W / display) 2-7.

The transmission procedure between the master unit 1 and the slave unit 2 is a polling procedure from the master unit 1 to the slave unit 2. In the transmission operation of the master unit 1, the serial data signal as shown in FIG. 2A from the CPU 1-7 is sent to the converter 1-4, and the converter 1-4
Is OFF when the serial data signal is at L (low) level, impedance (Z0) 1-2 and diode 1-
The power source (+ 5V) is sent from the 3 to the slave unit 2. Also, the converter 1
-4 is ON when the serial data signal is H (high) level
Then, the transmission signal voltage (+ 12V) is sent to the slave unit 2. Therefore, from the master unit 1 to the slave unit 2, as shown in FIG.
A signal obtained by superimposing a transmission signal having an amplitude of 7V on V is transmitted.

When the signal from the master unit 1 reaches the slave unit 2, it is input to the signal polarity matching circuit 2-1. The signal polarity matching circuit 2-1 is for matching the polarities in this circuit even when a signal of reverse polarity is received due to incorrect wiring of the transmission line 4 and when the wiring is normal. The circuit shown in FIG. A full-wave rectification circuit having a circuit configuration composed of various diodes D ₁ , D ₂ , D ₃ , and D ₄ is used.

The output of the signal polarity matching circuit 2-1 is sent in parallel to the power supply stabilizing circuit 2-2 and the signal detecting circuit 2-3. The power supply stabilization circuit 2-2 cuts the transmission signal component (7V) to supply only the power supply voltage (+ 5V), which is used as the power supply for each part. The signal detection circuit 2-3 is a circuit that detects a voltage level, and is a circuit that sets the threshold level to about 1/2 (3.5V) of the transmission signal line + power supply voltage. For example, a Zener diode (rated Voltage 3.5V) 2-3a, resistor 2-
3b and amplifier 2-3c. Amplifier 2-3c
Is output to the CPU 2-5 as a serial signal.

The CPU 2-5 calculates the serial signal,
It is stored, processed, and sent to the input / display device 2-7 for display.
When the main body is operated by operating the child machine 2 which is a man-machine interface, the input / output device 2-7 is operated by the switch (SW) of the input display device 2-7 to the CPU 2-5 via the input / output device (I / O) 2-6. Send a signal. In the CPU 2-5, calculation, storage and data conversion are performed and a serial data signal is output to the amplifier circuit 2-4.

The serial data signal is amplified by the amplifier circuit 2-4 and then converted into a serial signal having an amplitude width of 12 V as shown in FIG. 2C depending on whether or not the transmission line 4 is short-circuited by the serial data signal. ,Output. That is, when the serial data signal is "1", the signal is + 12V as it is, and when the serial data signal is "0", the transmission line 4 is short-circuited to output as a signal of 0V.

FIG. 3A shows a transmission line 4 from the master unit 2 to the slave unit 1.
3B shows an example of the waveform of the serial data signal transmitted via the transmission line 4, and FIG. 3B shows an example of the waveform of the serial data signal transmitted from the handset unit 1 to the base unit 2 via the transmission line 4.

When the serial signal from the slave unit 2 arrives, the serial signal is input to the signal detection circuit 1-6 through the signal polarity matching circuit 1-5. The signal detection circuit 1-6 extracts the serial data signal, and the CPU 1-7
Output to. The CPU 1-7 judges, calculates and stores the information of the serial data from the slave unit 2, and operates the main body 3 of the air conditioner through the input / output device 1-9.

[0017]

As described above, according to the present invention, a signal polarity matching circuit is applied to a master unit and a slave unit, and a transmission signal in which an ON / OFF signal having a predetermined amplitude level and a predetermined DC voltage level is applied to the master unit. And the signal from the slave unit is received through the signal polarity matching circuit, and the transmission signal from the master unit is received by the slave unit through the signal polarity matching circuit, and O of a predetermined amplitude level is received.
The N / OFF signal and the DC voltage of a predetermined level are discriminated, and the DC voltage of a predetermined level is used for the power supply of the slave unit.
Since the ON / OFF signal having a predetermined amplitude level is transmitted to the parent device through the signal polarity matching circuit, the following excellent effects can be obtained.

(1) A simple circuit configuration based on a direct current ON / OFF circuit without the need for a high frequency circuit for tone burst signals makes the communication line and the power supply line common, and the main unit to the slave unit. While supplying power to the machine,
Bidirectional data transmission can be performed, and the number of wiring work steps can be reduced.

(2) Since the signal polarity matching circuit is provided, there is no miswiring of the transmission line, so that it is not necessary to consider the polarity when wiring.

(3) Since the communication line and the power supply line are shared, the power supply circuit is unnecessary for the slave unit, and the slave unit can be miniaturized.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of a control communication device of an air conditioner of the present invention.

FIG. 2 is a diagram showing a waveform example of each part of the control communication device of the air conditioner shown in FIG.

FIG. 3 is a diagram showing a waveform example of a serial data signal transmitted via a transmission line.

FIG. 4 is a diagram showing a configuration example of a signal polarity matching circuit.

FIG. 5 is a diagram showing a configuration example of a signal detection circuit.

FIG. 6 is a diagram showing a configuration example of a control communication device for a conventional air conditioner.

[Explanation of Codes] 1 Master unit 1-1 Power supply 1-2 Impedance 1-3 Diode 1-4 Converter 1-5 Signal polarity matching circuit 1-6 Signal detection circuit 1-7 CPU 1-9 Input / output device (I / O) 2 slave unit 2-1 signal polarity matching circuit 2-2 voltage stabilizing circuit 2-3 signal detection circuit 2-4 amplification circuit 2-5 CPU 2-6 input / output device (I / O) 2-7 input Display device (SW / display) 3 Air conditioner body 4 Transmission line

Front page continuation (72) Inventor Taku Kawanishi 4-2-1 Motofujisawa, Fujisawa-shi, Kanagawa Ebara Research Institute Ltd. (72) Inventor Kazufumi Tateishi 4-2-1 Motofujisawa, Fujisawa-shi, Kanagawa Inside the EBARA Research Institute (72) Inventor, Chuichi Sone, 4-2-1 Motofujisawa, Fujisawa, Kanagawa Prefecture Inside the EBARA Research Institute

Claims (1)

[Claims] 1. An air conditioner main body, a master unit having a monitor control unit for monitoring and controlling the air conditioner main unit, and a control unit connected to the master unit by a transmission line for transmitting and receiving signals to and from the master unit. An air conditioner having a plurality of slave units having a plurality of slave units and transmitting various signals from the slave units to the master unit or transmitting various signals from the master unit to the slave units and displaying the various signals at the slave units. In the control communication device of the above, two transmission lines are used as transmission lines connecting the master unit and the slave unit, and a signal polarity matching circuit that matches the polarities of signals to the master unit and a plurality of slave units is provided, The master unit transmits a transmission signal in which an ON / OFF signal having a predetermined amplitude level is applied to a predetermined DC voltage level under the control of the monitor control means, and receives a signal from the slave unit through the signal polarity matching circuit. Means is provided, and the child device is the parent device. ON / OFF of the predetermined amplitude level by receiving the transmission signal from the circuit through the signal polarity matching circuit.
The signal and the DC voltage of a predetermined level are discriminated, the DC voltage of a predetermined level is used for the power supply of the slave unit, and the ON / OFF signal of a predetermined amplitude level is controlled by the control means through the signal polarity matching circuit. A control communication device for an air conditioner, which is provided with means for transmitting the data to a master unit.