JPH04123595A - Communication equipment for air-conditioner - Google Patents

Abstract

PURPOSE:To connect a termination resistor at the same time through the address setting at installation of a connection equipment by providing an address setting switch, a connection signal generating means generating a signal when a switch is set to a specific address number and a switching circuit connecting the termination resistor in parallel with a transmission line to the equipment. CONSTITUTION:The equipment is provided with an address setting switch 15A to decide the address of an equipment connected to a transmission line 11, a connection signal generating means 16A generating a signal when a specific address number is set to the switch, and a switching circuit 17A connecting a termination resistor 13A in parallel with the transmission line 11 when a signal is inputted thereto. When an installation person sets '00' to the address, for example, at the installation, the address switch 15A is connected to an H level entirely and an input signal to the connection signal generating means 16A goes all to H and a match signal is fed to the analog switch circuit 17A, which is conducted and the termination resistor 13A is connected in parallel with the transmission line 11. Thus, no special installation work is required to connect the termination resistor and the resistor is connected to the transmission line with simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a communication device for an air conditioner that has a twisted pair transmission line and performs data transmission.

Conventional technology In recent years, the development of air conditioners that use data transmission technology to control multiple devices has been progressing (for example,
196928).

An example of a conventional communication device for an air conditioner will be described below with reference to the drawings.

FIG. 4 shows the configuration of a conventional communication device for an air conditioner.

41 is a transmission line composed of twisted pairs 1), 42A
43 is a transmitting/receiving circuit (hereinafter referred to as T/R circuit) for transmitting and receiving data on the transmission line 41; 43 is a terminating resistor for improving waveform distortion of transmitted data due to reflection on the transmission line 410; 44A is the main body of the air conditioner which is controlled by information obtained by transmitting and receiving data through the T/R circuit 42A. Similarly, 42B and 44B are the T/R circuit and the air conditioner main body of the second air conditioner when controlling a plurality of air conditioners.

The operation of the air conditioner communication device configured as described above will be described below.

The data on the transmission line 41 is sent to the T/R circuit 42A.

The data is decoded by 42B and input into the main body of the air conditioner, and the air conditioners 44A and 44B control the equipment according to the decoded data.

In general, data on the transmission line 41 is reflected at the connection between the T/R circuits 42A, 42B and the transmission line 41 due to variations in the characteristics of the transmission line 41, multiple devices are connected, etc. A terminating resistor 43 is connected as a method of reducing waveform distortion due to reflection.

As a connection method, select one of several types of terminating resistors with resistance values while observing the waveform distortion of the transmitted data on the transmission line 41. Perform connection work.

Problems to be Solved by the Invention However, in the above configuration, the type of transmission line,
The value of the terminating resistor must be set every time the length of the line or the number of connected devices changes.

Another disadvantage is that the connection work for the terminating resistor unit must be performed separately from the connection of the equipment.

In view of the above-mentioned problems, the present invention provides an excellent communication device for an air conditioner that can connect a terminating resistor at the same time by simply setting an address when installing a connected device.

Further, the present invention provides an excellent air conditioner communication device that can cope with waveform distortion of transmitted data due to changes in the type of transmission line, line length, and number of connected devices.

Means for Solving the Problems In order to solve the above problems, a communication device for an air conditioner according to a first aspect of the present invention includes an address setting switch for determining the address of a device connected to a transmission line, and a switch for specifying an address. A second aspect of the present invention comprises a connection signal generating means that generates a signal when the address number is set to , and a switching circuit that connects a terminating resistor in parallel to the transmission line when the signal is input. The communication device of the harmonizer further includes a resistance connecting means for connecting a resistor in parallel with the terminating resistor according to a setting switch set by the installer, and is configured to be able to vary the equivalent value of the terminating resistor connected to the transmission line. Ru. A communication device for an air conditioner according to a third aspect of the present invention has, in addition to the configuration of the first aspect of the present invention, forced connection signal generation means for generating the signal according to the settings of the installer regardless of a specific address,
When a plurality of devices are connected to the transmission line, the switching circuit operates according to a specific address number to connect a terminating resistor to the transmission line.The forced connection of the device and the device to which an address other than the specific address number is set. The switching circuit is operated by a signal from the signal generating means, a terminating resistor is connected to the transmission line, and a plurality of terminating resistors are connected in parallel, so that the value of the terminating resistor can be equivalently changed. .

Effect of the Invention With the above-described configuration, the present invention allows the installer to connect a terminating resistor according to the characteristics of the transmission line to the transmission line by simply setting the address of the device without any installation work, and then attaching a resistor in parallel to the terminating resistor. Connections can be made by setting a setting switch for connection, or by operating a forced connection signal generating means that forcibly connects a resistor when multiple devices are connected to a transmission line.

Embodiment Hereinafter, a communication device for an air conditioner according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of a communication device for an air conditioner in an embodiment of the first invention.

In FIG. 1, reference numeral 11 denotes a transmission line composed of twisted pair wires. 12A is a T/R circuit that performs transmission and reception;
13A is a terminating resistor for reducing distortion of the transmitted data waveform due to reflection from the transmission line 11, and 14A is an air conditioner main body that is controlled based on the transmitted data.

16A is an address switch that sets the address of the air conditioner main body 14A, and 16A is an atrea switch 16.
Connection signal generating means comprising an AND circuit that determines whether the address set in A is an address number predetermined to connect the terminating resistor 13A to the transmission line 11 and generates a signal if it matches the predetermined address number. It is. According to this embodiment, this predetermined address number is "00".

17A is an analog switch circuit that connects the terminating resistor 13A to the transmission line 11 in response to a match signal from the connection signal generating means 16A. 30A is a power supply and 31A is a protection resistor.

The operation of the air conditioner communication device configured as described above will be explained using FIG. 1.

When the installer sets the address to 00'' at the time of installation, all Atrea switches 15A are connected to H'', and all input signals to the connection signal generating means 16A are H, and the analog switch circuit 17A conducts the match signal. The terminating resistor 13A is connected in parallel to the transmission line 11.

However, when the address is set to "600", for example, "ol", the input signal to the connection signal generating means 16A is "HHHHHHHHL" and no match signal is generated, so the analog switch circuit 17A does not conduct and is terminated. Resistor 13A may be connected to transmission line 11.

FIG. 2 shows the configuration of a communication device for an air conditioner in an embodiment of the second invention.

In FIG. 2, reference numeral 11 denotes a transmission line composed of twisted pair wires.

12A is a transmitting/receiving circuit that performs transmission and reception; 13 is a terminating resistor for reducing distortion of the transmitted data waveform due to reflection from the transmission line 110; and 14A is an air conditioner main body that is controlled based on the transmitted data.

15A is an address switch for setting the address of the air conditioner body 14A, and 16A is an address switch 15.
Connection signal generating means comprising an AND circuit that determines whether the address set in A is an address number predetermined to connect the terminating resistor 13A to the transmission line 11 and generates a signal if it matches the predetermined address number. It is. According to this embodiment, this predetermined address number is '00'.

17A is an analog switch circuit that connects the terminating resistor 13A to the transmission line 11 in response to a match signal from the connection signal generating means 16A. 30A is a power supply and 31Ald is a protection resistor. 18A is a resistor, and 19A is a setting switch for connecting the resistor 18A in parallel to the terminating resistor 13A.

The operation of the air conditioner communication device configured as described above will be explained using FIG. 2.

When the installer sets 7 dolen to 'oo'' at the time of installation, all address switches 16A are connected to H'', and all input signals to the connection signal generating means 16A become H'', and the analog switch circuit 17A conducts the matching signal and connects it to the terminal resistor. 13A is connected in parallel to transmission 1s11.

If you want to reduce the value of the terminating resistor by /J%, turn on the setting switch 19A, the resistor 18A is connected in parallel to the terminating resistor 13A, and the value of the terminating resistor is equimetrically (terminating resistor 1
3A x resistance 18A)/(terminal resistance 13A + resistance 18A)
It can be set small.

However, when the address is not set to 00'', for example, when it is set to 01, the input signal to the connection signal generating means 1eA is HHHHHHHL'' and no match signal is generated, so the analog switch circuit 17A does not conduct and the terminal resistor 13A is not connected to the transmission line 11.

FIG. 3 shows the configuration of a communication device for an air conditioner in an embodiment of the third invention.

In FIG. 3, reference numeral 11 denotes a transmission line composed of twisted pair wires. A represents the first device connected to the transmission line 11, and B represents the second device.

12A is a transmitting/receiving circuit for transmitting and receiving; 13 is a terminating resistor for reducing distortion of the transmitted data waveform due to reflection from the transmission line 11; and 14A is the main body of the air conditioner which is controlled based on the transmitted data.

15A is an address switch for setting the address of the air conditioner body 14A, and 16A is an address switch 15.
A connection signal generating means comprising an AND circuit that determines whether the address set in A is an Atrea number predetermined to connect the terminating resistor 13A to the transmission line 11 and generates a signal if it matches the predetermined address number. It is. According to this embodiment, this predetermined address number is 'oo'.

17A is an analog switch circuit that connects the terminating resistor 13A to the transmission line 11 in response to a coincidence signal from the connection signal generating means 1eA.

18A is a resistor, 19A is a 18A terminating resistor.
This is a setting switch for connecting in parallel to 3A.

2OA includes a forced switch 21A and a protective resistor 2 that generate a matching signal according to the settings of the installer regardless of the specific address.
This is a forced connection signal generating means composed of 2A. 23A
and 24A are dies for ORing the matching signals output from the connection signal generating means 16A and the forced connection signal generating means 20A, respectively. - 30A and 32A are 31A power supply.

33A is a protection resistor.

12B, 13B, 1, aB, 16B,
1 csB.

17B, 18B, 19B, 20B, 21B, 22B.

23B, 24B, 30B, 31B, 32B, and 33B are respectively second transmitting/receiving circuits having the same configuration as the first when multiple devices are connected to the transmission line 11, a terminating resistor,
Air conditioner body, address setting switch, connection signal generation means, analog switch circuit, resistor, setting switch, forced connection signal generation means 1 forced switch, protective resistor, diode, power supply.

It is a protective resistance.

The operation of the air conditioner communication device configured as described above will be explained using FIG. 3.

When the installer sets the address to oO'' at the time of installation, all address switches 1sA are connected to ``H'', and all input signals to the connection signal generating means 1eA are ``H'', and the analog switch circuit 17A conducts the match signal. The terminating resistor 13A is connected in parallel to the transmission line 11.

If you want to reduce the value of the terminating resistor, set switch 1.
When eA is turned on, the resistor 18A is connected in parallel to the terminating resistor 13A, and the equivalent value of the terminating resistor is (terminating resistor 13A).
x resistance 18A)/(terminal resistance 13A + resistance 18A).

Also multiple #! When a device is connected to the transmission line 11, by turning on the forced switch 21B of the second or subsequent device (in the embodiment, the second device), the analog switch circuit is activated by a coincidence signal from the forced connection signal generating means 20B. 17
B becomes conductive and the terminating resistor 13B is connected to the transmission line 11.

The terminating resistor 13A and the terminating resistor 13B are connected to the transmission line 11.The terminating resistor of the transmission line 11 is equivalently (terminating resistor 13A×terminating resistor 13B)/(terminating resistor 13A+
The terminal resistor 13B) can be made small and variable.

However, when the address is not set to 00'', for example, when it is set to 01'', the input signal to the connection signal generating means 16A becomes I-IHHHHHHHL'' and no match signal is generated, so the analog switch circuit 17A does not conduct and the terminal resistor 13A is not connected to the transmission line 11.

Effects of the Invention As described above, the first invention is such that when the installer sets a specific address at the time of installation, if the address number is equal to the preset address number, the terminating resistor is automatically connected to the transmission line. Terminal resistor with simple configuration,
Connection can be made without requiring any special installation work for connection, and no nupaine is required.

In addition, the second invention is such that when the installer sets a specific address input at the time of installation, if the address number is equal to the preset address number, the terminating resistor is automatically connected to the transmission line. By connecting a resistor in parallel with the terminating resistor, the value of the terminating resistor can be changed equivalently. With a simple configuration, the terminating resistor can be connected without the need for special installation work, and it also saves space. do not need.

Furthermore, in the third aspect of the present invention, when the installer sets a specific address at the time of installation, if the address number is equal to the preset address number, the terminating resistor is automatically connected to the transmission line. The value of the terminating resistor can be changed equivalently by connecting it in parallel with the terminating resistor. Also, when multiple devices are connected, not only one device but also multiple devices can be used to control the transmission line. The value of the terminating resistor can be changed equivalently, the terminating resistor can be varied with a simple configuration, and the connection can be made without the need for special installation work, and because it does not require space, it is low cost due to less construction work and wiring. If the terminating resistor can be connected in a 1:1 manner, the desired effect can be expected.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a communication device for an air conditioner according to an embodiment of the present invention, FIG. 2 is a block diagram showing a communication device for an air conditioner according to another embodiment of the present invention, and FIG. FIG. 4 is a block diagram showing a communication device for an air conditioner according to another embodiment of the invention. FIG. 4 is a block diagram of a communication device for a conventional air conditioner. 13A...Terminal resistor, 15A...Address setting switch, 16A...Connection signal generation means, 17A...Nuitching circuit, 18A...
...Resistance, 19A...Setting switch, 2
OA... Forced connection signal generation means. Name of agent: Patent attorney Akira Okaji and 2 others 734
・- 15A ・- 1'/A -- I? , At the end of the transmission line, 4 stakes were installed, and Suifa Nasu A and Nonang for Kumatagaki were completed. Part c! i Add resistance to history.

Claims (3)

[Claims] (1) A transmission line composed of twisted pairs, an address setting switch for determining the address of a device connected to the transmission line, and a connection signal that generates a signal when the switch is set to a specific address number. A communication device for an air conditioner, comprising a generating means and a switching circuit that connects a terminating resistor in parallel to the transmission line when the signal is input. (2) The device is characterized by having a resistor connecting means for connecting a resistor in parallel with the terminating resistor according to a setting switch operated by the equipment installer, so that the equivalent value of the terminating resistor connected to the transmission line can be varied. The communication device for an air conditioner according to claim 1. (3) It has a forced connection signal generation means that generates a signal according to the settings of the installer regardless of the specific address, and when multiple devices are connected to the transmission line, the switching circuit operates according to the specific address number and terminates. The switching circuit is operated by a signal from the forced connection signal generating means of a device connecting a resistor to the transmission line and a device to which an address other than a specific address number is set, and a terminating resistor is connected to the transmission line. 3. The communication device for an air conditioner according to claim 1, wherein the communication device for an air conditioner is configured to connect terminating resistors in parallel so that the value of the terminating resistors can be changed equivalently.