JP2861514B2 - Two-wire signal transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a main unit for controlling loads such as a water heater and an air conditioner (hereinafter, referred to as a main unit) and a remote control device for displaying an operation (hereinafter, referred to as a remote controller). The present invention relates to a two-wire signal transmission device that connects a remote controller with two wires, and supplies power from the main body to the remote controller with the two wires and transmits signals between the main body and the remote controller in a time-division manner.

[0002]

2. Description of the Related Art Heretofore, there has been proposed a method in which power supply and signal transmission are alternately performed assuming that such a main body and a remote controller are connected by two wires and power supply and signal transmission are performed in a time-division manner.
This signal transmission device will be described with reference to FIG. FIG. 4 shows a signal waveform between two lines connecting the main body and the remote controller. The power supply and the signal transmission are repeated every 5 ms, and the signal transmission is performed during the power supply stop period. One cycle of signal transmission is 100
In ms, it is composed of 10 phases. FIG. 5 shows a waveform of signal transmission in one phase. The transmission signal is composed of a synchronization pulse a, a start code b, phase data c, control data d, an error detection bit e, and a stop code f. A bi-phase encoding method is used, and a fixed 200 μs per data bit. It is long. In this example, control data that can be sent in one phase is 8 bits, and signal transmission of 10 bytes is possible in one cycle. The data of signal transmission from the main body to the remote controller is a control mode, hot water supply temperature, water level setting, clock data, and the like, and the data of signal transmission from the remote controller to the main body is mainly switch operation data. FIG. 6 shows the appearance of the remote controller in the water heater. The remote controller displays the hot water temperature 11, the bath temperature 12, the hot water level 13 for the bath, the LCD display of the time 14, and the operation input of each setting switch 15 with the main body. Is performed while performing signal transmission.

[0003]

In such a conventional two-wire signal transmission device, the data transmitted from the main body of the device to the remote controller is each data of the tapping mode, hot water supply temperature, hot water level, and time. It is necessary to determine the display content based on these data and output the display. That is, even if 42 ° C. is received as hot water temperature data, this data is only a numerical value and is different from data to be output for display, and cannot be directly output. After conversion to output data, output must be performed. Usually, control of signal transmission and control of display output are performed by a microcomputer. Therefore, conventionally, the display output is converted to output data by the remote controller, so when developing a new water heater, when developing a remote controller with a different display content than before, or slightly change the display content In such a case, it is necessary to modify the program of the microcomputer for the remote control again, which requires development man-hours, and a new mask is required, resulting in an increase in cost.

As a solution to this problem, if the output data itself can be transmitted from the main unit to the remote controller, the remote controller only needs to output the received data as it is. When changing the display, only the control microcomputer of the main unit needs to be changed. In other words, the microcomputers of the remote controllers can all be shared, but for that purpose, the amount of data for signal transmission must be increased. For example, considering the case where one of the eight LEDs is turned on, the display data can be represented by 4 bits if handled as numeric data.
Actual output data in the case of performing display by the 4 × 2 scanning method is 4 bits × 2, which is 8 bits, which is twice as large as that in the case of handling as numerical data. In the current signal transmission, the amount of data that can be transmitted from the main unit to the remote controller per cycle is too small to cope with this amount of data. There is no.

In order to increase the amount of signal transmission data per cycle, there are a method of increasing the amount of transmission data in one phase of signal transmission and a method of increasing the number of data that can be transmitted by increasing the number of phases in one cycle. However, the former means that the basic length per bit is shortened, and a high-speed and high-performance microcomputer is required as a microcomputer to be used, resulting in an increase in cost. In addition, there is also a problem that synchronization becomes difficult due to a short basic length, and normal transmission and reception cannot be performed. The latter has a problem of responsiveness, that is, a problem that the time from when the operation is performed to when the display on the remote control is changed becomes long.

[0006]

In order to achieve the above object, the present invention provides a main body for controlling a load, a display of the control state of the load connected to the main body by two electric wires, and a control state. A power supply unit for periodically supplying DC power from the main body to the remote controller via the electric wire, and a power supply stop period as one phase, and a plurality of phases as one cycle a phase management unit that manages a, with a T / L and register that specifies the receive mode of a plurality of phases in the cycle, the T / L register main body and the remote control device and the signal transmission line cormorants signal transmission based on and parts, and a memory <br/> be Lud Tabaffa the address corresponding to the phase control data by the signal transmission, the T / L registers negative
Multiple phases in one cycle depending on load control status
The transmission phase of the main unit or the transmission phase of the remote control device
Is specified arbitrarily.

[0007]

According to the present invention, when display switching is required, the T / L register is temporarily changed to increase the amount of signal transmission data from the main unit to the remote controller in one cycle, and the display output data itself is changed. In one cycle, the remote control microcomputer can be treated as an I / O port of the main unit, and the remote control microcomputers can be shared by remote control with different display contents, eliminating the need for new microcomputer development. A two-wire signal transmission device can be provided.

[0008]

An embodiment of the present invention will be described below with reference to FIG.

As shown in the figure, the main body 1 and the remote controller 2
Power is supplied from the main body 1 to the remote controller 2 by the power supply unit 4 periodically. Body 1
The remote controller 2 has signal transmission units 5 and 6 and data buffers 7 and 8, respectively, for mutually transmitting signals and storing data for signal transmission. Data buffers 7, 8
Are composed of addresses corresponding to the phases, and signal transmission is performed so that the same data is stored. What
Note that, in FIG. 1, in order to make the configuration of signal transmission easy to understand,
The relationship between the body 1 and one remote control 2 is described.
However, in actual use, the main body 1 is supplied to, for example, a bath.
Hot water is supplied to multiple places such as hot water and hot water for wash basin
Things. Therefore, the remote control device is not shown.
However, a plurality of hot water supply locations are usually provided.
Data transmission between the main unit 1 and each remote control device is mutually performed.
It is configured to be able to send. Therefore, FIG.
Remote control 2 is installed in two places (remote control A, remote control B)
Shows an example of a T / L register 9 when, this
Here, Rimoko installed in two places to simplify the explanation
The following description is based on the assumption that the remote controller B also has a T / L register. Here, performs transmission in phase values of T / L register corresponding to the phase number 1, but of performing reception in the phase of 0, between the main body 1 and two of the remote control 2
If data transmission is enabled mutually,
If specified on its own, problems such as signal collision will occur,
Accurate data transmission becomes impossible. Therefore, in one phase, the remote controller A and the remote
When one of the remote control B is specified as the transmission mode
The T / L register so that the other two
The problem of collision of the above signals
Preventing. Signal transmission is performed by the T / L register 9 and the phase management unit 10.

As a method of changing the value of the T / L register 9, a combination of the values of a plurality of T / L registers is determined in advance, and when a change is required, the combination is installed in one or two places of the main body.
This can be realized by transmitting a selection code of the T / L register 9 from the remote controllers A and B. As an example, FIG. 3 shows a T / L register when it is necessary to change the display on the remote controllers A and B installed at two locations . In the setting of this T / L registers, it is designated to the transmission phase of the body 1 of the eight phases from phase 0 to phase 7, the case body 1 remote control A, remote control
Against emissions B, you are possible to transmit the 8-byte data in one cycle, as a result, compared to when setting the T / L register 9 shown in FIG. 2, Li provided at two locations from the body 1
The amount of transmission to the remote controller A and the remote controller B is doubled, and a sufficient amount of data for transmitting the display output data itself can be secured.

Next, a specific procedure will be described.
First, in the case where the T / L register 9 as shown in FIG. 2 has a normal value, if the remote controller A and the remote controller B perform an operation for increasing the hot water supply temperature, the remote controller A and the remote controller
The switch B sends switch operation data for increasing the hot water supply temperature as transmission data to the main body 1. The main body 1 is a remote control A,
The hot water supply temperature is increased by + 1 ° C. based on the operation data from the remote controller B, and at the beginning of the next cycle, the T / L register 9 is changed to the value at the time of transmission of the display data shown in FIG. Remote control A,
After transmitting to the remote controller B , the display output data is transmitted in the phases 1 to 7. The remote controllers A and B change their T / L registers to predetermined values (shown in FIG. 3) based on the selection data of the T / L register 9 received in the 0 phase, and then display the subsequent data. It is transmitted as data.

[0012]

As is apparent from the above embodiment, according to the present invention, a plurality of phases in one cycle can be arbitrarily designated as the transmission phase of the device main body or the transmission phase of the remote controller according to the control state of the load. A pair of signal transmission units for performing signal transmission between the device main body and the remote controller based on the register, and a pair of memory for storing addresses corresponding to phases in the control data by the signal transmission. Since the data buffer is provided, the T / L register can be arbitrarily changed according to the control state of the device main body. Therefore, the T / L register is temporarily changed to increase the data amount of signal transmission from the device main body to the remote control device in one cycle and display output. The data itself can be signal-transmitted in one cycle, and the remote control device only needs to output the signal transmission data from the device as it is. You can microcontroller for emission device as if treated as input and output ports of the body.

Therefore, when developing a device that requires a new remote control device, even if a remote control device with a different display content is developed or the display content is slightly changed, the transmission data from the device main unit is changed. Since the display can be changed by simply performing the operation, it is not necessary to modify the program of the microcomputer for the remote control device, and the effect of reducing the number of development steps or the cost such as the cost of a mask can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of a two-wire signal transmission device according to one embodiment of the present invention.

FIG. 2 is a configuration diagram of a T / L register in a normal state of the two-wire signal transmission device.

FIG. 3 shows T at the time of display data transmission of the two-wire signal transmission device.
Configuration diagram of / L register

FIG. 4 is a voltage waveform diagram between two wires of a conventional two-wire signal transmission device.

FIG. 5 is a signal transmission waveform diagram in one phase of the two-wire signal transmission device.

FIG. 6 is a front view of a remote controller of the two-wire signal transmission device.

[Description of Signs] 1 Main Body (Equipment Main Body) 2 Remote Controller (Remote Control Device) 3 Electric Wire 4 Power Supply Unit 5, 6 Signal Transmission Unit 7, 8 Data Buffer 9 T / L Register 10 Phase Management Unit

Claims (2)

(57) [Claims] An apparatus main body for controlling a load, and a remote controller connected to the apparatus main body by two electric wires for displaying a control state of the load in the apparatus main body and performing an operation input for setting the control state. A power supply unit for periodically supplying DC power from the device main body to the remote control device by the electric wire, a phase management unit for managing a period of power supply suspension as one phase and managing a plurality of phases as one cycle, Transmit and receive modes for multiple phases in a cycle
To the memory with a T / L and a register that specifies a row Cormorant signal transmitting unit signal transmission between the device body and the remote control device based on the T / L register, the address corresponding to the phase control data by the signal transmitting a Lud Tabaffa, the T / L registers 1 Sa according to a control state of the load
The transmission phase of the
Or as the transmission phase of the remote control device.
A two-wire signal transmission device. 2. The two-wire signal transmission device according to claim 1, wherein, of the control data by signal transmission, the control data transmitted from the device main body to the operation display unit is the output data itself on the operation display unit.