JPH071944B2 - 2-wire remote control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention connects a main body of a water heater, a bathtub, an air conditioner, etc. and a controller for remotely controlling them by a two-core cable. The present invention relates to a two-wire remote control device.

<Prior art and its problems> Two lines of a conventional digital signal transmission system in which a main body controller attached to a main body to be controlled such as a water heater and one or a plurality of remote controllers are connected by a two-core cable. The first problem of the remote control device is that, as disclosed in Japanese Utility Model Publication No. 1-19504, for example, a digital signal transmission system using a microcomputer is adopted, and therefore the device as a whole is complicated and complicated. The thing is that it has become expensive. The second problem is a case of a simple two-wire remote control device unlike the above, but as seen in some cases, the input is one variable resistor switch 2
Even if the system has only one unit, two lamps, and one controller so that hot water can be supplied to multiple locations, operation switches and temperature control settings can be operated only in one location such as the kitchen or bathroom. It means that it was inconvenient.
A third problem is that when a plurality of lamps and buzzers of a remote controller are driven by an analog drive signal, the determination (within the remote controller) for this analog drive signal is due to the multiple ratio of the lamps and buzzers. That is, it becomes difficult due to variations in the characteristics of the circuit components as the number of output stages increases, and these variations had to be corrected by some method in order to make this determination correct.

Therefore, the present invention is a two-wire remote control device using a complete analog signal transmission system that can eliminate the first problem, that is, the complexity and cost of the device, by the digital signal transmission system. Can be implemented by using a device that can solve the above problem, that is, a constant current circuit and a variable resistance circuit that are easy to operate in a plurality of places, even though they are simple methods. In addition to the wire-type remote control device, a second wire-type remote control device in which the main control circuit can self-correct the output level so as to eliminate the third problem, that is, the problem caused by the variation in the characteristics of the circuit components, The purpose is to provide.

<Means for Solving the Problems> In order to achieve the above object, a two-wire remote control device of the present invention includes a main body controller attached to a main body to be controlled,
A two-wire remote control device comprising a remote controller installed at a different place from the main controller and a single two-core cable connecting the main controller and the remote controller, a). The main body controller comprises a DC power supply, a constant voltage circuit, a main control circuit, a voltage setting circuit, a power operational amplifier, and an operational amplifier circuit, (b). The remote controller comprises an analog operation signal generation circuit, a bridge rectifier circuit, an analog drive signal discrimination circuit, and a lamp / buzzer circuit, (c). In the input mode in which the main body controller inputs an analog operation signal from the remote controller, (a) the voltage setting circuit outputs an analog operation signal to the remote controller under the command of the main control circuit. An input voltage required to be transmitted is generated, and this voltage is transmitted to the positive input terminal of the power operational amplifier, and (b) the power operational amplifier outputs a negative feedback signal from the remote controller at the output destination. It functions as a constant current circuit by receiving, and supplies the input voltage transmitted from the voltage setting circuit as described above to the analog operation signal generation circuit by a constant current method. The analog operation signal generation circuit generates an analog operation signal by receiving the input voltage,
The same signal is transmitted to the differential amplifier circuit, and (d) the differential amplifier circuit outputs the analog operation signal,
It has a circuit configuration for converting to a voltage value suitable for the main control circuit and outputting it to the main control circuit, (d). In the output mode in which the main body controller outputs an analog drive signal to the remote controller, (a) the main control circuit starts a required control process based on the analog operation signal input in the input mode, and For the purpose of displaying the status of the control process on the lamp / buzzer in the remote controller, the voltage setting circuit is instructed to generate and transmit it to the power operational amplifier. (B) Voltage setting circuit Generates an analog drive signal under the command of the main control circuit and transmits it to the positive input terminal of the power operational amplifier, and (c) the power operational amplifier outputs a negative signal from its output terminal side. It functions as a constant voltage circuit by receiving the feedback signal, and it also controls the analog drive signal transmitted from the voltage setting circuit as described above. A constant voltage is supplied to the bridge type rectifier circuit of the controller, and (d) the analog drive signal discrimination circuit and the lamp / buzzer circuit pass the analog drive signal of the above constant voltage through the bridge type rectifier circuit. A circuit configuration for receiving, determining the nature of the signal, and starting the lamp / buzzer; (e). Further, the main body controller can experimentally search, set and store an appropriate value of the output level of the analog drive signal in an actual circuit prior to the start of the operation of the above output mode, and based on this storage, It has a circuit configuration capable of correcting the output level of the analog drive signal after the operation of the output mode is started, (f). Further, it is characterized in that the input mode for inputting the analog operation signal and the output mode for outputting the analog drive signal are configured to be switched at a constant cycle based on a command from the main control circuit.

<Operation> The two-wire remote control device of the present invention changes the analog operation signal in the input mode (functions as a constant current circuit).
It is generated by a power operational amplifier and a variable resistance circuit, and an analog drive signal in the output mode is generated by a voltage setting circuit and a power operational amplifier (which functions as a constant voltage circuit). Functioning as a device, the complexity of the circuit is eliminated and the manufacturing cost of the device is remarkably low as compared with the conventional two-wire remote control device of the digital signal transmission system. Further, the two-wire remote control device of the present invention generates an analog operation signal in the input mode by simply passing a constant current through a variable resistor, so that the device is extremely simple, but the operation switch and the temperature controller are not operated. The key operation can be reliably performed. Further, the two-wire remote control device of the present invention outputs the analog drive signal output from the main control circuit in the output mode,
It has a function to compare and correct with the output level proper value stored in the main control circuit in advance, so in the case of driving multiple lamps and buzzers of the remote controller with an analog drive signal (in the remote controller) It is possible to completely eliminate the inconvenience that it becomes difficult to determine the nature of the analog drive signal due to the variation in the circuit component characteristics due to the increase in the number of output stages (due to the complicated lamp / buzzer).

<Example> A two-wire remote control device of the present invention will be described with reference to the drawings illustrating an example thereof. FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a flow chart showing an input mode operation of this embodiment, FIG. 3 is a flow chart showing an output mode operation of this embodiment, and FIG. FIG. 6 is a flow chart showing a correction procedure for correcting the output level in the output mode of the present embodiment, FIG. 5 is a flow chart showing the operation of switching between the input mode and the output mode including the correction of the output level, and FIG. Is a graph showing the type of voltage of the analog operation signal, FIG. 7 is a graph showing the type of voltage of the analog drive signal, and FIG. 8 is a curve serving as a correction reference prior to correcting the output level in the output mode. That is, it is a graph showing a procedure for obtaining a curve showing the relationship between input and output signal voltages.

First, as the first case, the description starts from the case where the main body controller of the two-wire remote control device of the present invention is in the input mode in which an analog operation signal is input from the remote controller. In FIG. 1, it is assumed that the main control circuit 100 (comprising a microcomputer) in the main body controller 150 attached to the main body to be controlled is waiting for an analog operation signal to be input. At this time, the terminal O ₁ of the main control circuit 100 is OFF, so the switching element (transistor array) 101 is also OFF, and the switching element 112 connected via the resistor 111 is also OFF. ing. Also, at this time, the terminal O ₂ of the main control circuit 100 is not turned off, therefore,
The switching element (transistor array) 102 is also off. In addition, the correction terminal O _{3 is} also OFF, so that the switching element (transistor array) 124 is also O.
It is FF. At this time, the output terminal O of the main control circuit 100
A command is issued from ₄ to the voltage setting circuit 103 to set and output the input voltage (see the flowchart of FIG. 2, steps 200 and 201). As a result, the voltage setting circuit 103 sets the input voltage (Vi) and applies it to the positive input terminal 116 of the power operational amplifier 114 (at this point, the voltage at the end 120 of the DC power supply 119 becomes Via the body 108 and the resistor 118 to the negative input terminal 115 of the power opamp 114). Then, the output voltage Vo from the output terminal 113 of the power operational amplifier 114 is transmitted to the remote controller (hereinafter, abbreviated as remote controller) 50 via one wire 140 of the two-core cable 130, and the analog operation in the remote controller is performed. The variable resistor circuit (that is, the resistor 1, the resistor 2, the temperature control variable resistor 3) of the signal generation circuit 60 is applied to the end point 121 of the resistor 108 in the main body controller 150 and the resistor 118 is applied. Through the negative input terminal of the power operational amplifier 115
Is applied in a negative feedback manner (thus, the operational amplifier functions as a constant current circuit). Remote control 50 at this point
Operation switch 4 in the analog operation signal generation circuit 60 in
When is turned on, the above variable resistance circuit (resistors 1, 2, 3)
The resistance value of
The voltage of 21 rises (compared to before the operation switch 4 was turned on). When the voltage value (Vi ′) thus changed is led to the minus input terminal 115 of the power operational amplifier 114 via the resistor 118, the input voltage (Vi) is matched and the input of the power operational amplifier 114 becomes Vi−. Since it becomes Vi ′, the output voltage Vo of the power operational amplifier 114 decreases.
Next, the voltage generated by the analog operation signal generation circuit 60 of the remote controller, that is, the potential difference Vo-V between the circuit 110 and the circuit point 109.
i ′ is applied to the differential amplifier circuit 104 having the amplification degree α, and V = α
(Vo-Vi ') voltage conversion is performed. The output voltage V of the differential amplifier circuit 104 is then input to the analog operation signal input terminal I ₁ of the main control circuit 100. Voltage V in this case
Is V = v ₁ (see FIG. 6), the main control circuit
100 determines that the operation switch 4 of the analog operation signal generation circuit 60 described above is ON (see the flowchart of FIG. 2, steps 202 and 203).

In this case, if it is not actually driving, the main control circuit 10
0 turns on the operation, and if it is running, turns off the operation and determines the position of the variable resistor for temperature adjustment 3 by the setting change at the next input to synthesize the low antibodies 1, 2, and 3 V = v _{2 to} v ₃ ) of the input signal (see FIG. 6) to control the new temperature adjustment (see the flowchart of FIG. 2, steps 204, 205, 206, 207 and 208).

As described above, since the differential amplifier circuit 104 is used in the circuit that transmits the analog operation signal from the analog operation signal generation circuit 60 to the main control circuit 100, the main control circuit 1
The input range of 00 becomes wide and the input accuracy becomes good.

As described above, in the input mode of the two-wire remote control device of the present invention, the analog operation signal for operating the main control circuit is the constant current circuit, the resistance circuit (resistors 1, 2, 3) and the operation switch 4. The linearity of the analog operation signal is extremely good since it is formed on the basis of, and therefore, a wide operation range can be given to the main control circuit.

Next, as a second case, a case of an output mode in which an analog drive signal is output from the main body controller 150 of the two-wire remote control device of the present invention to the remote controller 50 will be described. In FIG. 1, when the main control circuit 100 detects the ON state of the operation switch 4 of the remote controller 50, its terminal O ₁ turns ON, and therefore the switching element (transistor array) 101 also turns ON.
Switching element that becomes N and connects through the resistor 111
112 also turns ON. Further, the terminal O ₂ of the main control circuit 100 is also turned on, and thus the switching element (transistor array) 102 is also turned on, which is different from the first case described above.
The end point 121 of the resistor 108 has a ground potential. However, the correction terminal O ₃ is OFF as in the first case, and therefore the switching element (transistor array) 124 is also O.
It is FF. Main control circuit 100 terminals as above
As a result of switching O ₁ and O ₂ from OFF to ON, the output Vo is connected to the negative input terminal 115 of the power operational amplifier 114 by a resistor.
The voltage at the line point 122 divided by the resistor 117 and the resistor 118 is applied, and as a result, the power operational amplifier 114 functions as a variable constant voltage source. At this time, from the output terminal O ₄ of the main control circuit 100, the operation lamp 10 of the remote control 50
The voltage setting circuit 103 is instructed to output a signal for turning on. As a result, from the voltage setting circuit 103, the analog drive signal Vi for turning on the operation lamp 10 (however, Vi = V ₁ (see FIG. 7))
Is applied to the positive input terminal 116 of the power operational amplifier 114. Since the minus input terminal 115 is at the ground potential, as a result of the above, the output of Vo = V ₁ is output from the power operational amplifier 114 (see the flowchart of FIG. 3, steps 300, 301 and 302). This output is then applied to the remote control terminal 132, passed through the bridge rectifier circuit 5, and further applied to the constant voltage diode 9 via the resistors 7 and 8, where V ₁ > V _ZD9 (however, V ₁ > V _{ZD9 Since} V ₁ is set so that _ZD9 is the operating voltage of the constant voltage diode 9, the switching transistor 6 is turned on.
Therefore, the analog drive signal voltage V ₁ is
The operation lamp (LED) 10 is lit via 1 and 12 and the operation lamp is turned on. However, since the signal voltage V ₁ is set lower than the operating voltage of the constant voltage diode 16 connected to the next stage of these circuits, the combustion lamp (LED) 17 is not turned on. Now, when the combustion sequence is started after the operation is started in this way, first, a signal for turning on the combustion lamp 17 of the remote controller 50 should be output from the output terminal O ₄ of the main control circuit 100. A command indicating that is issued to the voltage setting circuit 103. as a result,
The voltage setting circuit 103 outputs an analog drive signal Vi (where Vi = V ₂ (see FIG. 7)) for lighting the combustion lamp 17. As a result, in the end, the remote control
At 50, the voltage (voltage value V ₂ ) of the analog drive signal is applied to the constant voltage diode 16 via the resistors 13 and 14, and the voltage value V ₂ is set to exceed the operating voltage of the diode 16. Because the switching transistor 15
Is turned on, and the signal voltage turns on the combustion lamp (LED) 17 via the resistor 18. (The flowchart of FIG. 3,
(See steps 303 and 304) In the second case, that is, in the output mode, as described above,
The power operational amplifier 114 can be made to function as a variable constant voltage source, and a simple and small variation output circuit for an analog drive signal can be formed.

Next, the main body controller of the two-wire remote control device of the present invention experimentally searches and sets an appropriate value of the output level of the analog drive signal in an actual circuit before starting the operation of the output mode. It can be stored, and based on this storage, the output level of the analog drive signal in the above output mode can be corrected.

That is, first, as an experimental operation, the terminal O ₁ of the main control circuit 100 is
And O ₂ are both turned off, the correction terminal O ₃ is turned on, and the minimum setting voltage from the output terminal O ₄ as a starting point is added to the plus input terminal of the power operational amplifier 114 via the voltage setting circuit 103.
Output to 116 (this output voltage is Vi in Fig. 1).
Then the resulting output Vo of the power op amp 114
Is transmitted to the remote controller 50 via one wire 140 of the two-core cable 130, and the variable circuits 1 to 4 and the lamp driving circuit 5 are transmitted.
Applied to ~ 18. Then the circuit point 121 of the main controller 150 (as described in the first case "Input Mode" above)
A constant current i flows toward, and this current i
Flow through 121 and 125 (resistor 125 due to correction terminal O ₃ being ON and switching element 124 being ON)
Current also flows). As a result, the circuit point
A potential of Vi ′ is generated in 121, and this potential is applied to the negative input terminal 115 of the power operational amplifier 114 via the resistor 118. As a result of these, the potential difference applied between the circuit points 110 to 109 is detected by the operation amplification circuit 104 of the amplification degree α, amplified to the value of V = α (Vo−Vi ′), and then the main control circuit 100 has the same value. Input to input terminal I ₁ . So the main control circuit 1
00 stores the value of V as V = Vn ₋₁ . Next, when the output from the output terminal O ₄ of the main control circuit 100 is increased by a certain amount (from the value of the above-mentioned minimum set voltage), the voltage V = Vn of the main control circuit 100 is increased by the same process as described above. It is input to the input terminal I ₁ and stored in the main control circuit 100.
By repeating such an experimental operation, all the relationships between the voltages Vi and V as shown in the carne of FIG. 8 are stored in the main control circuit 100, and the experimental operation ends therewith. A little analysis will be added to the meaning of the curve in FIG. 8 and a method for the main control circuit 100 to correct the output voltage level using this curve will be described. First, as shown in FIG. 8, the voltage V input to the input terminal I ₁ of the main control circuit 100 increases as Vi increases, but at a certain point of this curve, the voltage regulator diode 9 of the remote controller 50 ( When the voltage V ₁ applied (via the resistor 8) reaches the operating voltage V _ZD9 of the constant voltage diode 9 (as explained in the second case above), the switching transistor 6 is turned on and, as a result, the operation lamp 10 lights up. To do. Then, ΔV _A = Vn in Fig. 8
The slope of −Vn ₋₁ changes as ΔV _A → V _B. After that, the combustion stage starts, and from the point on the curve where the lamp 10 is lit, the curve further rises to the right toward the state where the fuel lamp 17 is lit. And accordingly, the slope of the curve is Δ
It changes from V _B to ΔV _{C and} so on.

The voltage values Va and Vb at the boundary of the inclined polygonal line in FIG. 8 are captured according to the process of the flowchart in FIG. 4, and the voltage value at the boundary thereafter can also be captured as Vr = (VaVb) / 2 + B. The curve in FIG. 8 is meaningful as described above and shows a certain meaningful and proper relationship between V and Vi (verified by experiment). Therefore, the main control circuit
100 is the output voltage (Vi) based on the input voltage (V) based on these experimental data (curves) held in the storage device.
Can be used as a proper reference to correct The method of this correction will be described in more detail below.

First, the main control circuit 100 turns on the operation switch 4 of the remote controller 50.
When the operation lamp ON is commanded to the remote controller 50 after detecting N, the output signal which is the value of V ₁ in FIG. 7 before the correction
Vi can be corrected to an appropriate value based on the relationship shown by the curve in FIG. That is, the main control circuit 100 appropriately increases the output from the output terminal O ₄ until the input voltage (V) to the input terminal I ₁ reaches the reference value Vr stored in the experiment, and then the reference value Vr is increased. The output command value (Vi) from the output terminal O ₄ when it reaches is set as the corrected V ₁ value.

Next, the main control circuit 100 turns on the operation lamp to the remote controller 50.
When instructing to turn on the combustion lamp and
The output signal Vi that was the value of V ₂ is the same as above (however, in this case, by the method of predictive correction based on the corrected V ₁ )
Correct to an appropriate value. That is, the operating voltage of the constant voltage diode
Of V _ZD16, an increased amount with respect to the operating voltage V _Zd9 constant voltage Deiodo 9 and [Delta] V _Z, when the corrected value of the output signal value V ₁ and V _1, the value V ₂ after the correction of the output signal value V ₂ is , V ₂ = V ₁ + ΔV ₂ . An output command is output from the output terminal O ₄ of the main control circuit so that the output signal of V ₂ thus corrected and increased is output from the voltage setting circuit 109 (see the flowchart of FIG. 3, step 304).

The operation of the two-wire remote control device of the present invention in the input mode and the output mode is as shown in the flow sheets of FIGS. 2 and 3, respectively. Based on a command from the main control circuit 100, the input mode and the output mode are switched at fixed intervals (see FIG. 5) so that the analog operation signal and the analog drive signal are transmitted between the main body controller terminal 131 and the remote controller terminal 132. The circuit configuration is such that control is carried out such that transmission is carried out cyclically through a single two-core cable 130 laid in, that is, analog two-core transmission control is performed, and such a configuration is utilized. As a result, a complete analog signal transmission system is realized. Therefore, comparing the two-wire remote control device of the present invention with a similar device of the conventional digital signal transmission system eliminates circuit complexity.

In this embodiment, the case where one operation switch is used in one remote controller has been described. However, since the analog operation signal generation circuit in this embodiment is a simple circuit including a resistance circuit and a switch, Not only can the number of switches in the remote controller be increased, but also the number of remote controllers can be increased easily and at low cost. Further, in the present embodiment, only the single operation lamp and the single combustion lamp are considered as the display lamps, but the number of these lamps is increased and other lamps (for example, temperature control lamps) are used.
Can be easily implemented (although it is necessary to change the command signal from the output terminal of the main control circuit and the number of output stages in the main body controller).

Further, the output signal from the output terminal O ₄ of the main control circuit 100 is
There is no problem with the output by the D / A conversion as described in the present embodiment, the output by the pulse width modulation, or the digital output (by increasing the port output). Furthermore, if the correction described in this embodiment is utilized, as shown in the flowchart of FIG. 4, step 410, it is possible to detect an abnormality in the circuit inside the remote controller or the main body controller.

<Effect> The first effect of the two-wire remote control device of the present invention according to claim 1 is mainly because the circuit related to the generation of the analog operation signal is composed of a constant current circuit and a variable resistance circuit. The linearity of this analog operating signal input to the control circuit is very good. The second effect is that since the analog operation signal is input to the main control circuit via the differential amplifier circuit, the range of the operation signal can be widened in combination with the good linearity described above. The accuracy is also very good. The third effect is that the circuit for generating the analog drive signal output from the main body controller to the remote controller is
Since the operational amplifier and the simple resistance circuit connected to the negative input terminal of the operational amplifier are used, the present drive signal generation circuit is extremely simple and has little variation in characteristics. The fourth effect is that since the signals exchanged between the main body controller and the remote controller are all analog signals, the two-wire remote controller of the present invention is a complete analog signal transmission system. , The conventional digital signal transmission method 2
Compared to a wire-type remote control device, the circuit complexity is eliminated and the manufacturing cost of the device is significantly lower. The fifth effect is that since the analog operation signal generation circuit in the remote controller is composed of a simple variable resistance circuit and operation switches, it is easy and economical not only to increase the number of switches but also to increase the number of remote controllers themselves. Can be carried out. A sixth effect is that since the two-wire remote control device of the present invention has a function of self-correcting the output signal, the number of parts of the same circuit and related circuits is increased due to an increase in lamp / buzzer circuits and the like, resulting in variations in part characteristics. Even if it occurs, the signal level output from the main control circuit can be maintained at an appropriate value, and therefore, the correct determination (of the analog drive signal determination circuit of the remote controller and the lamp / buzzer circuit) corresponding to the output signal can be performed. And the correct lamp display can be maintained. Further, by using the above-mentioned correction function, it is possible to detect an abnormality in the circuit in the remote controller or the main body controller.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a flow chart showing an input mode operation of this embodiment, FIG. 3 is a flow chart showing an output mode operation of this embodiment, and FIG. FIG. 6 is a flow chart showing a correction procedure for correcting the output level in the output mode of the present embodiment, FIG. 5 is a flow chart showing the operation of switching between the input mode and the output mode including the correction of the output level, and FIG. Is a graph showing the type of voltage of the analog operation signal, FIG. 7 is a graph showing the type of voltage of the analog drive signal, and FIG. 8 is a curve serving as a correction reference prior to correcting the output level in the output mode. That is, it is a graph showing a procedure for obtaining a curve showing the relationship between input and output signal voltages. 5: Bridge type rectifier circuit 50: Remote controller 60: Analog operation signal generation circuit 70: Analog drive signal discrimination circuit 80: Lamp circuit 100: Main control circuit 103: Voltage setting circuit 104: Operation amplification conversion circuit 114: Power operational amplifier 119: DC power supply 123: Constant voltage circuit 130: 2-core cable 150: Main unit controller

Claims (1)

[Claims] 1. A main body controller attached to a main body to be controlled, a remote controller installed in a place different from the main body controller, and a single unit connecting the main body controller and the remote controller. A two-wire remote control device comprising a two-core cable comprising: (a). The main body controller comprises a DC power supply, a constant voltage circuit, a main control circuit, a voltage setting circuit, a power operational amplifier, and a differential amplifier circuit, (b). The remote controller comprises an analog operation signal generation circuit, a bridge rectifier circuit, an analog drive signal discrimination circuit, and a lamp / buzzer circuit, (c). In the input mode in which the main body controller inputs an analog operation signal from the remote controller, (a) the voltage setting circuit outputs an analog operation signal to the remote controller under the command of the main control circuit. An input voltage required to be transmitted is generated, and this voltage is transmitted to the positive input terminal of the power operational amplifier, and (b) the power operational amplifier outputs a negative feedback signal from the remote controller at the output destination. The input voltage transmitted from the voltage setting circuit as described above is supplied to the analog operation signal generating circuit by the constant current method while receiving a signal from the ) The analog operation signal generation circuit generates an analog operation signal by receiving the input voltage,
The same signal is transmitted to the differential amplifier circuit, and (d) the differential amplifier circuit outputs the analog operation signal,
A circuit configuration for converting to a voltage value suitable for the main control circuit and transmitting it to the main control circuit, (d). In the output mode in which the main body controller outputs an analog drive signal to the remote controller, (a) the main control circuit starts a required control process based on the analog operation signal input in the input mode, and For the purpose of displaying the status of the control process on the lamp / buzzer in the remote controller, the voltage setting circuit is instructed to generate and transmit it to the power operational amplifier. (B) Voltage setting circuit Generates an analog drive signal under the command of the main control circuit and transmits it to the positive input terminal of the power operational amplifier, and (c) the power operational amplifier outputs a negative signal from its output terminal side. It functions as a constant voltage circuit by receiving the feedback signal, and it also controls the analog drive signal transmitted from the voltage setting circuit as described above. A constant voltage is supplied to the bridge type rectifier circuit of the controller, and (d) the analog drive signal discrimination circuit and the lamp / buzzer circuit pass the analog drive signal of the above constant voltage through the bridge type rectifier circuit. A circuit configuration for receiving, determining the nature of the signal, and starting the lamp / buzzer; (e). Further, the main body controller can experimentally search, set and store an appropriate value of the output level of the analog drive signal in an actual circuit prior to the start of the operation of the above output mode, and based on this storage, It has a circuit configuration capable of correcting the output level of the analog drive signal after the operation of the output mode is started, (f). A two-wire remote control device configured to switch between an input mode for inputting the analog operation signal and an output mode for outputting the analog drive signal at a constant cycle based on a command from the main control circuit.