JPH0257748B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a signal transmission device between a plurality of air conditioners and a control device that centrally controls the plurality of air conditioners.

Conventional configuration and its problems Conventionally, in this type of signal transmission device, when signal transmission is performed using electrical energy as a signal, the electrical circuits constituting the signal transmission sections of two or more separated devices are Noise is likely to occur between the common potentials between the terminals, and it is necessary to take measures such as suppressing noise and ensuring that the signal is transmitted to the other party. Also,
As the number of controlled devices increases, the number of signal transmission lines connecting each controlled device or between a controlled device and a control device increases, and the probability of disconnection of signal transmission lines increases, and the signal transmission line Line construction workability and maintainability are poor.

FIG. 1 shows a commonly used method of signal transmission by photocoupler bonding. 1 is a command signal transmitting/receiving section on the control device side, 2 is an operation signal transmitting/receiving section on the controlled device side, 11 and 21 are reference voltage supply terminals,
8 and 28 are switching elements for driving transmission signals, 1
9 and 29 are receiving terminal resistors, 16 and 26 are photocouplers, and the light emitting elements 14 and 24 and the light receiving element 15,
It is composed of 25 pieces. 17 and 27 are light emitting current limiting resistors; 3, 4, 5, and 6 are signal transmission lines; 1
2 and 22 are transmission signal input terminals, and 13 and 23 are transmission signal output terminals. As is well known, signal transmission in such a configuration is carried out by each light receiving element 15, 2 in the signal transmitting/receiving unit provided in the control device and the controlled device, respectively.
5 and each light emitting element 1 driven by the other device
4 and 24 are optically coupled. However, as shown in the figure, such a configuration requires at least four signal transmission lines 3, 4, 5, and 6 for signal transmission and reception between the two machines, and is not economical. As the number of connections increases, the probability of incorrect connections and disconnections increases, and the current situation is that there are many problems in terms of wiring work and maintenance.

Purpose of the Invention The present invention provides a signal transmission line that prevents malfunctions due to noise, transmits signals between an air conditioner and control equipment using fewer signal lines, and connects the signal transmitting and receiving parts of each air conditioner in parallel; For example, it is necessary to reliably detect disconnections in the signal transmission lines that connect each air conditioner or between an air conditioner and a control device, and to perform complex control for signal transmission between the air conditioner and the control device. The purpose of the present invention is to provide a signal transmission device that does not

Composition of the Invention A signal transmission device for an air conditioner according to the present invention includes a plurality of air conditioners and a command signal transmitting/receiving unit that outputs control contents for centrally monitoring and managing the operating status of each air conditioner. A first actuation signal transmitting/receiving section connected to a control device via at least two signal transmission lines, and each of the air conditioners is provided with a first operating signal transmitting/receiving section that operates upon receiving an output signal from the command signal transmitting/receiving section, The first operation signal transmission/reception section of each air conditioner is wired in parallel with the signal transmission line, and a second operation signal transmitting/receiving section of each air conditioner is connected in the middle or at the end of the signal transmission line to the control device.
The control output output from the command signal transmitting and receiving section is received by the second operating signal transmitting and receiving section for matching and checking, and the control output is output from the second operating signal transmitting and receiving section. The present invention is characterized in that a transmission/reception signal coincidence detection circuit section is provided for receiving a signal transmitted by the command signal transmission/reception section and checking the coincidence.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 to 4. In FIG. 2, 30 indicates a signal transmission unit on the control equipment side, 1 is a command signal transmission/reception unit provided on the control equipment side, 2 is a first operation signal transmission/reception unit provided on the air conditioner, 3, 4 31 is a connection terminal block for relaying the signal transmission lines 3 and 4; 32 is a second operation signal transmitting/receiving section; Command signal transmitting/receiving section 1 provided on the device side
receives the return signal transmission lines 3 and 4 connected through the first operation signal transmission and reception section 2 of each air conditioner sequentially via the connection terminal block 31, and then goes to the first operation signal transmission and reception section 2. Check the signal to be transmitted. Reference numeral 33 denotes a signal coincidence detection circuit section, in which a signal sent from the command signal transmitting/receiving section 1 to each first actuation signal transmitting/receiving section 2 passes through the connection terminal block 31 in sequence, and the signal transmission lines 3 and 4 are disconnected in the middle. This is to check whether the connection between the signal transmission lines 3 and 4 has been changed without any change, or whether the crossover connections of the signal transmission lines 3 and 4 have been switched in the middle.

In the command signal transmitting/receiving section 1, 34 is a reference voltage supply terminal, 35, 36, 37, 38 are switching transistors, 39, 40, 41, 4
2, 43, 44, and 45 are bias resistors, 46 is a light emitting current limiting resistor, 47, 48, 49, and 50 are switching diodes, 96 is a terminating resistor, 51 is a reverse voltage protection diode for the transistor 35, and 52 is a An inverter circuit for signal inversion, 53 a reception terminal, 54 a signal transmission/reception switching input terminal for switching between signal transmission and reception, 55 a transmission signal input terminal, and 56 and 57 noise removal capacitors.

On the other hand, a first operation signal transmission/reception section 2 on the air conditioner side and a second operation signal transmission/reception section 32 on the control equipment side.
, 58, 59, 60, 61 are photocouplers, and light emitting elements 62, 63, 64, 65, respectively.
and light emitting elements 66, 67, 68, and 69, which are optically coupled to each other. 70,71,7
2, 73 are reverse current prevention diodes, 74, 75 are switching elements, 76, 77 are reference voltage supply terminals, 78, 79 are terminating resistors, 80, 81 are receiving terminals, 82, 83 are light emitting current limiting resistors, 84, 85
indicates a transmission signal input terminal. Note that the first actuation signal transmitting/receiving section 2 has the same structure and is connected in parallel to the command signal transmitting/receiving section 1 via the connection terminal block 31, respectively.

Signal transmission by such a device is based on two-wire half-duplex communication, and first, a signal sent from the command signal transmitting/receiving unit 1 on the control equipment side, such as starting an air conditioner, is transmitted. A mode in which the signal is received by the first operation signal transmitting/receiving section 2 on the air conditioner side will be explained.

Directional control of signal transmission and reception in this embodiment is provided in the command signal transmission and reception section 1 on the control equipment side.
Signal transmission/reception switching input terminal 54 of command signal transmission/reception section 1
Transistor 38 is made non-conductive by the signal supplied to , and at the same time, transistor 36 is made conductive via inverter circuit 52 . As a result, the command signal transmitting/receiving section 1 is set to the transmission mode. In this mode, when a signal to be transmitted, such as a pulse signal or an analog signal, is supplied to the transmission signal input terminal 55 to drive the transistor 37, the voltage supplied from the reference voltage supply terminal 34 changes from the light emitting current limiting resistor 46 to Diode 47 → signal transmission line 3 → light emitting element 62 in the first operation signal transmission and reception unit 2 on the air conditioner side → diode 70, and then again via the signal transmission line 4 in the command signal transmission and reception unit 1 on the control equipment side flows to The voltage then flows from the collector to the emitter of the transistor 37 and is applied to the conductive transistor 36 via the diode 50. Therefore, the light emitting element 62 in the first actuation signal transmitting/receiving section 2 on the air conditioner side is driven. As a result, a reception output is induced at the light receiving terminal 80 on the emitter side of the light receiving element 66, and a predetermined operation, for example, the operation of the compressor of an air conditioner is performed. Further, the signal emitted from the command signal transmitting/receiving section 1 on the control equipment side is transmitted to the light receiving element of the second operating signal transmitting/receiving section 32 having the same configuration as the first operating signal transmitting/receiving section 2 provided on the air conditioner side. The same output as the reception output induced in the light receiving terminal 80 in the second actuation signal transmitting/receiving section 2 on the air conditioner side is also obtained in the light receiving element 81 on the emitter side of 68.

Next, the command signal transmitting/receiving section 1 on the control equipment side transmits the signals output from the first operating signal transmitting/receiving section 2 on the air conditioner side, such as the operation/stop status of the compressor of the air conditioner due to temperature adjustment. The reception mode will be explained below.

In this case, first, the transistor 38 is made conductive by a signal supplied to the signal transmission/reception switching input terminal 54 of the command signal transmission/reception unit 1 on the control device side, and at the same time, the transistor 36 is made non-conductive via the inverter circuit 52. The process begins by setting the signal transmitter/receiver 1 to receive mode. In this mode, the voltage supplied from the reference voltage supply terminal 34 is transmitted via the transistor 35 → diode 51 → signal transmission line 4 to the light receiving element 67 in the first operating signal transmitting and receiving section 2 on the air conditioner side → backflow prevention. The signal flows again into the command signal transmitting/receiving section 1 via the diode 71 and the signal transmission line 3. Then, it is connected to ground via the terminating resistor 96 → switching diode 48 → transistor 38. Therefore, if the transistor 74 provided to drive the light emitting element 63 in the first operating signal transmitting/receiving section 2 on the air conditioner side is driven by a signal input from the transmission signal input terminal 84, the transistor 74 is driven. , a reception output is induced to the reception terminal 53 in the command signal transmission/reception section 1 on the control equipment side.

FIG. 3 shows the timing of signal transmission between the command signal transmitter/receiver 1 and the first actuation signal transmitter/receiver 2, where A is the commercial power supply waveform and B is the commercial power supply waveform A.
This shows the synchronizing signal waveform obtained by full-wave rectifying the sine wave shown in , and then converting it into a pulse-like signal in a waveform shaping circuit. C indicates a transmission signal waveform that is transmitted to the partner device in synchronization with the synchronization signal B.

The transmission signal C is "1" and "0" as shown in the same figure.
is an encoded serial signal, and the synchronization signal B
It is synchronized with the rise of In the transmission signal C, TS is a code indicating the beginning of the signal component to be transmitted, and in this embodiment, three clocks are set as "0". Further, the TQ section is kept at "1" in the pause code transmitted following the first code. Furthermore, the TD section is a signal component that is sent following the leading code TS, and one bit of data is formed by combining the signal components of the TQ section and the TD section. Thereafter, the signal component in this format is given the necessary number of bits to form a transmission signal. The code section of the TD section is allocated for two clocks in the figure, but the first half of these two clocks is always kept at "0", and the second half is kept at "1" and "0". ” is a code part that is undefined and changes depending on the content of the information to be transmitted.

What has been described above is the content regarding the transmission mode of the transmission signal. Regarding reception of the transmission signal,
This can be achieved by performing signal processing opposite to the signal processing performed in the transmission mode. In other words, signal reception begins by detecting that the transmission signal sent from the other party has fallen, and then continues by receiving the serial signal sent from the other party, so in this embodiment, the serial signal is The synchronization signal used when creating the synchronization signal is created by the method described above, and this synchronization signal is used for the reception timing.

To detect the leading code TS part of the transmission signal C, check whether it is the leading code by checking that it is kept at "0" for at least two clocks after the leading code part falls. If the reception is normal, the reception mode is continued, and if the reception is abnormal, the reception mode is terminated.

If the TS part is received normally, the following signal components
Detection of the TD section begins by detecting a falling edge of the signal, similar to the detection of the TS section.
In other words, the falling edge of the TQ section is detected, and after one clock has elapsed, as shown in Figure 3.
In the TD part, one bit of the signal component can be received by determining whether there are more "1" or "0" components during the latter one clock period to which the information content of the transfer is assigned. can.
Thereafter, continuously transmitted signals are received using the same detection method. The above is the operation related to the reception mode.

Detection of disconnection in the signal transmission lines 3 and 4 connecting the command signal transmission and reception section 1 and the first operation signal transmission and reception section 2 is as follows.
The falling edge of the received signal [FIG. 3 C'] induced in the receiving terminal 81 of the second actuation signal receiving section 32 and the transmitting signal C supplied from the transmitting signal input terminal 55 of the command signal transmitting/receiving section 1 Including the propagation delay time of the transmission signal caused by the delay of the Tr from the point in time, that is, the attenuation of the signal voltage by the signal transmission lines 3 and 4 and the stray capacitance of the signal transmission lines 3 and 4, and the location of the transmission information. The signal of the timing signal [FIG. 3 d] is applied to the AND circuit 87 from the terminal 86 of the signal coincidence detection circuit section 33, and the output of the AND circuit 87 obtained is applied to the exclusive OR circuit [hereinafter, EX-
(referred to as OR)] 88, and the other is a transmission signal obtained by inputting the transmission signal C and the timing signal d to an AND circuit 89,
By checking the output state of the output terminal 90 of the EX-OR 88, it is possible to know whether or not disconnection of the signal transmission lines 3 and 4 has been detected. e in Figure 3 is the output terminal 90
The output signal is "0", which means that the transmitted signal C and the received signal C' match, and the signal transmission lines 3 and 4
Indicates that there is no disconnection. Further, in the above configuration, if the transmitted signal C and the received signal C' do not match, a signal that becomes "1" is outputted from the output terminal 90 of the EX-OR 88. E in FIG. 4 shows the state at this time, and shows the state when the transmitted signal C and the received signal C' do not match. FIG. 4 shows signal waveforms at the same locations as in FIG. 3 when the signal transmission lines 3 and 4 are disconnected during signal transmission.

Also, AND circuits 91, 92 and
The EX-OR93 does not supply a command signal to the first operation signal transmitting/receiving section 2 on the air conditioner side.
That is, it is a detection section provided to detect disconnection of the signal transmission lines 3 and 4, regardless of control of the air conditioner. That is, when the above-mentioned command signal transmitting/receiving section 1 is set to the reception mode, when a transmission signal of "1" or "0" as shown in FIG. 3C is supplied from the transmission signal input terminal 85, the command signal is The AND circuit 92 matches the signal received from the light receiving terminal 53 of the receiving section 1 and the timing signal shown in FIG.
The output is combined with the signal supplied from the transmission signal input terminal 85 and the timing signal to an AND circuit 91.
By inputting the matched output to the EX-OR93, the AND circuit 8
The same result as detected in the configuration consisting of 7, 89 and EX-OR 88 appears at output terminal 95.

Effects of the Invention As explained above, the air conditioner signal transmission device of the present invention connects a plurality of air conditioners and a command signal transmitting/receiving unit that outputs signal contents for monitoring and controlling the operating status of each air conditioner. , connected via two signal transmission lines, and each of the air conditioners is provided with a first actuation signal transmitting/receiving section that operates in response to an output signal from the command signal transmitting/receiving section; The first operating signal transmitting/receiving sections of the air conditioners are connected in parallel to each other and connected to the two signal transmission lines, and the first operating signal transmitting/receiving sections of each of the air conditioners are connected in sequence. The end or middle of the signal transmission line is connected to the second operation signal transmitter/receiver 32 provided on the control equipment side, and the command signal transmitter/receiver, the first operation signal transmitter/receiver 2 of the air conditioner, and the first operation. Since the signal transmitting/receiving sections 2 are electrically isolated from each other, even if a compressor in an air conditioner generates noise when it is turned on or off, the signal transmission and reception sections 2 are not easily affected by the noise.

In addition, in particular, the signal transmission section on the control equipment side is equipped with a second actuation signal transmission and reception section that can monitor the transmission signal output from the command signal transmission and reception section 1, and a transmission and reception signal coincidence detection circuit section. This enables more accurate signal transmission to the first actuation signal transmitting/receiving section, including detection of disconnection. Further, according to the signal transmission device of this configuration, at least individual air conditioner number information and control information are included in the signal component transmitted between the command signal transmission and reception section and the first and second operation signal transmission and reception sections. By adding this, many air conditioners can be connected, and the circuit configuration can also be extremely simple, which has various advantages.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional signal transmission device, FIG. 2 is a circuit diagram of an embodiment of the signal transmission device for an air conditioner according to the present invention, and FIGS. 3 and 4 are transmission and reception in the signal transmission device. FIG. 3 is an explanatory diagram showing signal transmission timing. DESCRIPTION OF SYMBOLS 1... Command signal transmitting/receiving section, 2... First operating signal transmitting/receiving section, 3, 4... Signal transmission line, 32... Second operating signal transmitting/receiving section, 33... Transmitting/receiving signal coincidence detection circuit section.

Claims (1)

[Claims] 1. Connecting multiple air conditioners and a control device equipped with a command signal transmitting/receiving unit that outputs control contents to centrally monitor and manage the operating status of each air conditioner via at least two signal transmission lines. each air conditioner is provided with a first actuation signal transmitter/receiver that operates upon receiving an output signal from the command signal transmitter/receiver;
A second actuation signal transmitting and receiving section provided in the control device is connected in the middle or at the end of the signal transmission line by wiring the operation signal receiving sections in parallel, and the control output output from the command signal transmitting and receiving section is connected. Said second
A transmitting/receiving signal matching detection circuit is configured to receive the signal outputted from the second operating signal transmitting/receiving section and verifying the match, and receiving a signal output from the second operating signal transmitting/receiving section and verify matching. Air conditioner signal transmission device.