JP2001309467A - Operation terminal unit for remote supervisory and control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enlarge a display area showing the operation state of a load. SOLUTION: A handle 15 of a switch SW, constituted of a depression switches, is formed of a diffuse-transmissible synthetic resin molded item. A light emitting element 27 changing a lighting state according to the operation state of the load is stored in a unit body 1, so that it is positioned inside the handle 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control data generated by connecting a plurality of terminals to a transmission unit via a signal line and monitoring data input to one of the terminals by operating a switch. A terminal used in a remote monitoring and control system in which the terminal that operated the switch is transmitted to another terminal associated with the address data by the address data and the load is controlled by the other terminal. In addition, the present invention relates to an operation terminal of a remote monitoring and control system provided with the above-described switch.

[0002]

2. Description of the Related Art Conventionally, a remote monitoring control system having a configuration shown in FIG. 25 has been known (for example, JP-A-62-193483). In the transmission unit 41,
A plurality of terminals 42 to which monitoring data is input by operating a switch SW via a two-wire signal line Ls, a plurality of terminals 43 for controlling a load (not shown) via a relay Ry, and the like. Is connected. Individual address data is set in each of the terminals 42 and 43, and the transmission unit 41 recognizes the terminals 42 and 43 using the address data. The terminal 42 provided with the switch SW is an operation terminal, and the terminal 43 for controlling the load via the relay Ry is a control terminal. The relay Ry controlled by the control terminal 43 has a contact inserted between the load and the power supply, and the contact is opened and closed according to the output of the control terminal 43. Further, a relay transformer T for stepping down a commercial power supply is provided to apply a voltage to be applied to the coil of the relay Ry. As the relay Ry, a so-called remote control relay having a built-in latching relay is used.

[0003] The transmission unit 41 is connected to the signal line Ls.
A transmission signal Vs having a format as shown in FIGS. 26A and 26B is transmitted. That is, the transmission signal Vs includes a start pulse SY indicating the start of signal transmission, a mode data signal MD indicating a signal mode, and an address data signal transmitting address data for individually calling the operation terminal device 42 and the control terminal device 43. AD, a control data signal CD for transmitting control data for controlling the load, a checksum data signal CS for detecting a transmission error, and a time for receiving a return signal from the operation terminal 42 or the control terminal 43. This is a bipolar (± 24 V) time-division multiplexed signal including a signal return period WT as a slot, and data is transmitted by pulse width modulation.

In each operation terminal 42 and each control terminal 43, when the address data of the transmission signal Vs received via the signal line Ls matches the address data set respectively, the control of the transmission signal Vs is performed. In addition to taking in the data, the monitoring data signal is returned in a current mode (a signal transmitted by short-circuiting the signal line Ls via an appropriate low impedance) in synchronization with the signal return period WT of the transmission signal Vs.

[0005] The transmission unit 41 sets a mode data signal MD in a dummy mode, and a dummy transmission signal provided with an empty address not set in each of the operation terminal 42 and the control terminal 43 as address data. A dummy signal transmitting means for transmitting is provided. Transmission unit 1
FIG. 26 generated from one of the operation terminals 42
After detecting the operation terminal 42 that generated the interrupt signal when receiving the interrupt signal as shown in (c), there is also provided an interrupt processing means for accessing the operation terminal 42 and returning the monitoring data. That is, the dummy signal transmitting means always sends a dummy signal to the signal line Ls, and when an interrupt signal generated from the operation terminal 42 is detected in synchronization with the start pulse signal ST of the dummy transmission signal, the dummy signal is transmitted by the interrupt processing means. The unit 41 sends a transmission signal Vs in which the mode data signal MD is set to the address confirmation mode. Upon receiving the transmission signal Vs in the address confirmation mode, the operation terminal 42 that has generated the interrupt signal returns the address data set in the operation terminal 42 in synchronization with the signal return period WT of the transmission signal Vs. I do. In this way, the transmission unit 41 obtains the address of the operating terminal that has generated the interrupt signal, and accesses the operating terminal 42 using the obtained address, whereby the monitoring data from the operating terminal 42 is transmitted. receive.

In the transmission unit 41, an operation terminal 42
Based on the monitoring data returned from the server, control data to be transmitted to the control terminal 43 connected to a load having a preset correspondence with the switch SW is created, and a transmission signal Vs including the control data is generated. The control signal is transmitted to the line Ls and the control data is transmitted to the corresponding control terminal 43 to control the load.

By the way, as shown in FIG. 27, the operating terminal 42 includes a body 1 having a handle 15 of a switch SW to be pressed on the front, and is adjacent to the handle 15 on the front of the body 1. There is a configuration in which display windows 45a and 45b are provided in a portion where the display windows 45a and 45b are provided. The housing 1 contains a light emitting element (not shown) whose lighting state changes according to the operation state of the load, and the lighting state of the light emitting element can be visually recognized through a display window. In the example shown in FIG. 27, two display windows 45a and 45b are provided in the body 1, and the front of the body 1 having the display windows 45a and 45b near the handle 15 as shown in FIG. 27, a decorative cover 30 is attached as shown in FIG. The decorative cover 30 includes a nameplate 33 having a transparent window 33a at a position corresponding to the handle 15 and light-transmitting windows 33b and 33c at positions corresponding to the display windows 45a and 45b. Handle 15
A name card (not shown) in the form of a sheet is arranged between the nameplate 33 and the nameplate 33.

[0008]

As described above, since the display windows 45a and 45b are provided near the handle 15 for operating the switch SW on the front surface of the body 1, the operating state of the load is provided. Can be checked only through the small-area display windows 45a and 45b. That is, since most of the front surface of the body 1 is occupied by the handle 15, the display windows 45a and 45b are provided in the remaining small area, and the display windows 45a and 45b have a small area. Therefore, in a case where a plurality of operation terminals 42 are collectively arranged on the monitoring panel 40 in a building or the like to centrally monitor the operation state of the load, as shown in FIG. The display terminal 44 incorporating the light emitting element shown in FIG.
2 is provided separately from the display terminal 4 for each operation terminal 42.
4 are arranged adjacent to each other. Display window 4
To increase the area of 5a, 45b, it is conceivable to reduce the size of the handle 15, but it becomes difficult to operate the handle 15. On the other hand, if the size of the display windows 45a, 45b is increased while maintaining the size of the handle 15, The container 1 will be enlarged.

After all, when it is necessary to make the display indicating the load state easy to see, as in the case where the monitoring panel 40 is configured by arranging a plurality of operation terminals 42 as described above, the operation terminal 42 is used. Not only the terminal device 42 but also the display terminal device 44 is required separately, which causes a problem that the installation area becomes large and the cost increases. Further, since the signal line Ls must be connected to both the operation terminal 42 and the display terminal 44 and the address must be set not only in the operation terminal 42 but also in the display terminal 44, the address setting is performed. The work is also very troublesome.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a separate display terminal by increasing the area of a portion for displaying the operation state of a load as compared with the conventional configuration. Provided is an operation terminal of a remote monitoring and control system, which makes it easy to visually recognize a display indicating the operation state of a load without a load, and enables a relatively small area to be arranged even when a plurality of units are arranged collectively. It is in.

[0011]

According to a first aspect of the present invention, a plurality of terminals are connected to a transmission unit via a signal line, and a transmission signal including address data and control data is transmitted from the transmission unit to each terminal. On the other hand, it is transmitted by time division multiplexing
Transmitting the control data generated based on the monitoring data input by any one of the terminals to another terminal associated with the address data with respect to the terminal to which the monitoring data has been input, and transmitting the control data to the other terminal; An operation terminal device used for a remote monitoring and control system that controls a load by a device, and provided with a switch for inputting monitoring data, provided with a container housing the switch, and for pressing the switch. A handle made of a diffusion-transmissive material exposed on the front surface of the container, and a light-emitting element which is housed in the container facing the handle and whose lighting state changes according to the operation of the load.

According to a second aspect of the present invention, in the first aspect, a plurality of the light emitting elements are provided corresponding to the handle.

According to a third aspect of the present invention, in the first aspect of the present invention, the light emitting element is mounted on a display substrate provided separately from a circuit substrate on which the switch is mounted.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the handle and the display substrate are formed with an engaging portion for engaging the concave and convex with each other to hold the display substrate on the handle. .

According to a fifth aspect of the present invention, in the first aspect of the present invention, the load is turned on and off by the switch.
One of three operation states can be selected, and the light emitting element emits different colors when the load is on and off.

According to a sixth aspect of the present invention, in the first aspect of the present invention, an address storage unit comprising a non-volatile memory for holding the address and an optical wireless signal for writing and reading the address storage unit are transmitted and received. A possible light emitting element and light receiving element are provided, and the light emitting element and the light receiving element transmit and receive an optical wireless signal through the handle.

According to a seventh aspect of the present invention, in the first aspect of the invention, there is provided an embedded wiring device in which the vessel is disposed on a construction surface such that a rear portion is embedded in the construction surface and a front surface is exposed from the construction surface. Can be mounted on a mounting frame for fixing the mounting surface to the construction surface, the mounting frame is formed in a rectangular frame shape having a window, and three sets of device mounting means are provided in the longitudinal direction. The external dimension in the direction is 3 of the dimension in the longitudinal direction of the window hole.
It is formed in a size corresponding to one-half.

According to an eighth aspect of the present invention, in the first aspect of the invention, there is provided an embedded wiring device in which the vessel is disposed on a construction surface such that a rear portion is embedded in the construction surface and a front surface is exposed from the construction surface. Can be mounted on a mounting frame for fixing the mounting surface to the construction surface, the mounting frame is formed in a rectangular frame shape having a window, and three sets of device mounting means are provided in the longitudinal direction. The external dimension in the direction is formed to a dimension corresponding to the dimension in the longitudinal direction of the window hole.

According to a ninth aspect of the present invention, in the first aspect of the present invention, a series circuit of a switching element and an impedance element is inserted between the signal lines, and the switching element is turned on and off according to the monitoring data. A protection circuit for forcibly turning off the switching element when the on state of the switching element continues for a predetermined time;

According to a tenth aspect of the present invention, there is provided the optical wireless signal according to the sixth aspect of the present invention, wherein a series circuit of the light emitting element, the switching element, and the impedance element is inserted between both ends of a power supply and the switching element is turned on and off. And a protection circuit for forcibly turning off the switching element when the on state of the switching element continues for a predetermined time.

According to an eleventh aspect of the present invention, in accordance with the sixth aspect of the present invention, a capacitor inserted in an output path of the light receiving element so as to extract a signal corresponding to an optical wireless signal by removing a DC component from the output of the light receiving element. Is provided.

According to a twelfth aspect of the present invention, in the sixth aspect of the present invention, a capacitor inserted in an output path of the light receiving element so as to extract a signal corresponding to an optical wireless signal by removing a DC component from the output of the light receiving element. And an amplifier circuit for amplifying the signal extracted through the capacitor.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) In the present embodiment, an example in which four switches SW are provided in one body 1 as shown in FIG. The longitudinal direction of this container 1 (FIG. 1)
In the upper right-lower left direction) is the large angle continuous type (JI
(See SC8304), so that only one mounting frame can be attached to the mounting frame used when constructing the embedded wiring device called "SC8304". Therefore, the dimension in the longitudinal direction of the container 1 shown in the present embodiment is a dimension corresponding to the dimension in the longitudinal direction of the window hole of the mounting frame described later. These dimensions are referred to as "three module dimensions" as in the case of the large-angle continuous wiring device.

The body 1 is formed by a body 11 having an open front surface (upper surface in FIG. 1) and a cover 12 disposed on the front side of the body 11. Assembling holes 13 are formed at four places in the peripheral portion of the body 11, and assembling legs 14 protruding from the rear edge of the cover 12 are inserted into the assembling holes 13 and hooking claws provided at the rear end of the assembling legs 14. 14a is locked to the peripheral portion of the rear end of the assembling hole 13 so that the body 11
And the cover 12 are combined. In short, the body 11 and the cover 12 are connected only by aligning the cover 12 with the body 11 and pressing them together.

A circuit board 21 on which a circuit portion for realizing the function as an operation terminal 42 is mounted inside the body 1
Are stored in the circuit board 21, and four switches SW
Is implemented. Further, in order to connect the signal line Ls to the circuit board 21, the terminal 2 is connected to the circuit board 21 via the connection line Lc.
2 are connected. Each terminal 22 is a threaded terminal in which a terminal screw 22b is screwed to a terminal plate 22a,
The terminal screw 22b and a part of the terminal plate 22a are arranged to be exposed on the rear surface.

Each of the switches SW is a small push button switch (so-called tact switch), and is pushed through a handle 15 to be pushed. Each handle 15 has a rectangular outer shape and is inserted into four handle mounting holes 16 provided in the front wall of the cover 12 so that each handle 15 can be moved back and forth so that the front end is on the front side of the cover 12. Exposure to A retaining claw 15a is projected from the outer peripheral surface of the four circumferences of each handle 15, and the retaining claw 15a can be brought into contact with the peripheral rear surface of the handle mounting hole 16. Therefore, the handle 15 is prevented from dropping forward from the cover 12 by the retaining claw 15a. Handle 15
Is a synthetic resin molded product provided with diffusion permeability. That is, the handle 15 is formed using acrylic or polyethylene as a synthetic resin having transparency, and in order to impart diffuse transparency, milky or mixed with a diffusing material, or subjected to surface embossing, Either of these technologies is used.

A display board 23 made of a printed board is provided so as to correspond to each handle 15, and each display board 23 is connected to the circuit board 21 via a tape wire 24. Each display board 23 is formed with a through hole 23a through which an operation element 25 pressed by the switch SW is inserted, and each of the display boards 23 is screwed into the handle 16 through each display board 23. Are fixed to the respective handles 16. On one surface (upper surface in FIG. 1) of the display substrate 23 facing the inner surface side of the handle 16, a plurality (eight in the illustrated example) of light-emitting elements 27, which are chip elements of light-emitting diodes, are surface-mounted. Here, the light emitting element 27 is connected to the display substrate 2.
3 are arranged so as to be substantially evenly distributed over the entire surface of the substrate 3.
Further, as the light emitting element 27, the same number of light emitting elements 27 are provided, or two-color light emitting diodes are provided.
One emission color can be selected from at least two different colors. For example, the emission colors of green and red are selected, and by making the emission colors different, it is possible to represent the operating state of the load on and off.

As described above, since the handle 15 has a diffuse transmittance, the entire handle 15 is illuminated by turning on the light-emitting element 27, and a display corresponding to the operation state of the load is displayed on the handle 15. In comparison with the case where a display window is provided separately from the handle 15 as in the conventional configuration, the area of the light emitting portion can be increased without increasing the size of the body 1. . Also,
Since the display substrate 23 is attached to the handle 16 and most of the light from the light emitting element 27 passes through the handle 16, the light output from the light emitting element 27 can be used efficiently for display, and as a result, It is possible to suppress power consumption required for lighting the light emitting element 27 while performing relatively bright display. In addition, a plurality of light emitting elements 27 are provided for the same light emitting color, and the light emitting elements 27 are
3, the light can be extracted from the entire handle 15 almost uniformly. Further, since the display area for indicating the operation state of the load is increased, identification is easy even in a bright place. In particular, if the color difference between the emission colors is increased, the identification is further facilitated.

One of the display substrates 23 (the rightmost display substrate 23 in the illustrated example) has a light projecting element 28a and a light receiving element 28 for projecting and receiving an optical wireless signal using infrared rays as a medium.
b is arranged. That is, it is necessary to set an address in the operation terminal 42, and the operation terminal 42 in the present embodiment is provided with an address storage unit (not shown) composed of a nonvolatile memory (EEPROM), Is used to write and read addresses to and from the address storage unit. Therefore, a light emitting element 28a and a light receiving element 28b are provided for transmitting and receiving an optical wireless signal to and from an externally provided address setting device.
The light emitting element 28a and the light receiving element 28b are mounted on the display substrate 23 together with the light emitting element 27. Since the display substrate 23 is covered with the handle 15, the optical wireless signal is also transmitted and received through the handle 15. That is, the light emitting / receiving section of the optical wireless signal does not affect the appearance. Here, the optical wireless signal is infrared light, and the light emitting element 27 emits light in the visible light region, so that light from the light emitting element 27 does not interfere with the optical wireless signal. Also,
The optical wireless signal is transmitted through the handle 15 having a diffuse transmission property. However, if a high-sensitivity light receiving element 28b is used, or if the amplification of the output of the light receiving element 28b is increased, a particular problem occurs. Absent.

On the front surface of the cover 12, a protruding base 1 in which a central portion housing the handle 15 projects forward from both sides.
7 are formed, and a plurality of hooking projections 18 (two on each side in the illustrated example) are provided on both side surfaces of the protruding base 17. A decorative cover 30 having a hook leg 31 engageable with the hook projection 18 is detachably attached to the front surface of the body 1. The decorative cover 30 has four name mounting holes 32 each of which exposes each handle 15 when attached to the cover 12.
Nameplate 3 having a transparent window portion 33a at a portion covering at least the name mounting hole 32 on the front surface of the decorative cover 30
3 are fixed in an overlapping manner. The name attachment hole 32 holds a name card 34 capable of indicating a name associated with a load operated by each switch SW.
That is, the name card 34 is disposed between the window 33 a of the nameplate 33 and the handle 15. As described above, since the light from the light emitting element 27 passes through the handle 15, the name card 34 is also formed of a transparent material (transparent resin sheet) so as to transmit the light. Further, the window 33a is formed to be thin and has such flexibility that the handle 15 can be pushed while being overlapped with the handle 15.

As described above, the vessel 1 in the present embodiment can be mounted on the mounting frame used for the embedded wiring device, and is attached to both sides of the cover 12 to be mounted on the mounting frame. Each pair of mounting claws 19 is protruded. Each mounting claw 19 is provided in a pair near the base of the assembly leg 14. On the other hand, the mounting frame 2 is formed in a rectangular frame shape having a window hole 51 in the center as shown in FIG. The mounting claw 19 provided on the body 1 can be engaged with the device mounting hole 53. That is, the body 1 is held by the attachment frame 2 by the engagement of the attachment claws 19 with the instrument attachment holes 53. A screw insertion hole 55 is formed in each of the upper and lower horizontal frame portions 54 surrounding the window hole 51 of the mounting frame 2, and when an embedding box such as a switch box is embedded in the construction surface, the box is inserted through the screw insertion hole 55. By screwing a screw 56 (see FIG. 3) into the embedding box, the mounting frame 2 can be fixed to the construction surface. Also, a clip fitting hole 57 is formed in each horizontal frame portion 54 of the mounting frame 2,
One end of a clamp (not shown) is inserted into the clamp hole 57 so as to be pivotally supported. A fastening screw (not shown) inserted through the screw insertion hole 55 is screwed into the holding member, and the distance between the other end of the holding member and the peripheral portion of the mounting frame 2 is variable according to the amount of tightening the fastening screw. It is configured to be. Therefore, when fixing the mounting frame 2 to the wall panel, a mounting hole is formed in the wall panel, and the clamping metal is inserted into the mounting hole with the fastening screw loosely screwed into the mounting hole. By tightening the screw, the peripheral portion of the mounting hole can be held between the holding member and the mounting frame 2. Screw holes 58 for attaching a decorative plate (not shown) overlapping the front side of the mounting frame 2 are also formed in the upper and lower horizontal frame portions 54 of the mounting frame 2. That is, if a screw that is screwed into the screw hole 58 through the decorative plate is used, the decorative plate can be attached to the mounting frame 2 by the screw.

As shown in FIG. 4, when a plurality of operation terminals 42 of the present embodiment are mounted on the monitoring panel 40 to centrally monitor the operation state of the load, the display terminals can be displayed in comparison with the conventional configuration. By eliminating the need for a terminal, the installation space for the monitoring panel 40 can be significantly reduced as compared with the conventional configuration.

(Second Embodiment) This embodiment is different from FIG.
As shown in FIG. 7, a component with a lead is used as the light emitting element 27, and the light emitting element 27 is mounted on the circuit board 21 without using the display substrate 23. In this configuration, since the display substrate 23 is not provided, the number of substrates can be reduced as compared with the first embodiment. Other configurations are the same as those of the first embodiment.

(Third Embodiment) This embodiment is different from FIG.
As shown in the figure, the dimensions of the body 1 are different from those of the first embodiment. That is, the container 1 of the first embodiment is provided with a container 1 of “one module size” in which the length in the longitudinal direction of the container 1 is reduced to approximately one third. Up to three mounting frames can be mounted on the mounting frame 2 used in the first embodiment. In the first embodiment, four switches SW are provided in one body 1. In this embodiment, one switch SW is provided in one body 1. is there.

The body 11 constituting the container 1 used in the present embodiment is open at the front like the body 11 used in the first embodiment, but is assembled forward from the front edges of the left and right side walls. The piece 61 is formed in a projecting shape, and the assembly piece 6 is formed.
1 has an assembly hole 62 formed therein. The assembly piece 61 fits into an assembly groove 63 formed on both left and right outer surfaces of the cover 12, and an assembly claw 64 protruding from the bottom surface of the assembly groove 63 engages with the assembly hole 62, so that the body 11 is closed. And cover 12
And are combined.

The light emitting element 27 and the light emitting element 2 are provided inside the body 1 in addition to the circuit board 21 on which the switch SW is mounted.
The display substrate 23 on which the light receiving element 28a and the light receiving element 28b are mounted is housed, and the circuit substrate 21 and the display substrate 23 are connected via a tape wire 24. Chip elements are used for the light emitting element 27, the light projecting element 28a and the light receiving element 28b.

The other structure is the same as that of the first embodiment, and the structure in FIG. 6 with the same reference numerals as in FIG. 1 functions in the same manner as the members in the first embodiment.

However, as shown in FIG. 7, when the monitoring panel 40 is configured by using a plurality of operation terminals 42 of the present embodiment, the display terminal is not required, and the display panel is not required. The installation space for the monitoring panel 40 can be significantly reduced. Here, in the first embodiment, four switches SW are provided on the three-module unit 1, but in this embodiment, one switch SW is provided on the one-module unit 1. The same number of switches S
If W is provided on the monitoring panel 40, the configuration of the present embodiment requires a larger installation space for the monitoring panel 40 than the configuration of the first embodiment. Because you can set the interval of SW freely,
The degree of freedom of the arrangement of the switches SW is higher in the present embodiment.

(Fourth Embodiment) This embodiment is different from FIG.
As shown in FIG. 7, a container 1 having one module size similar to that of the third embodiment is used. However, in the third embodiment, the display substrate 23 is separate from the circuit substrate 21.
In this embodiment, the circuit board 21 is provided.
Light emitting element 27, light emitting element 28a and light receiving element 28b
And have implemented. In the present embodiment, the circuit board 21
Light emitting element 27, light emitting element 28a and light receiving element 28b
Is used as a leaded element. The other configuration is the same as that of the third embodiment, and the description is omitted.

(Fifth Embodiment) In the first embodiment and the third embodiment, a configuration is adopted in which the display substrate 23 on which the light emitting element 27 is mounted is fixed to the handle 15 by screws 26. However, in this embodiment, the screw 26
This shows a configuration in which the display substrate 23 is fixed to the handle 15 without using any. As shown in FIG. 9, the handle 15 used in the present embodiment has a holding protrusion 65 protruding from the inner bottom surface.
Is used to fix the display substrate 23 to the handle 15.

The holding projection 65 is formed such that the front end (rear end) projects rearward from the rear surface of the handle 15, and a portion of the holding projection 65 protruding from the handle 15 is about the thickness of the display substrate 23. A holding portion 66 having a large diameter at the tip end is formed. Also, handle 15
A push portion 67 is formed at the base of the holding projection 65 inside the holding member 65 so as to be in contact with the tip of the operator 25 of the switch SW. 68 are formed. That is, the operator 25 of the switch SW passes through the inside of the portion where the split groove 68 is formed, and comes into contact with the pushing portion 67. A part of each locking claw 15a protruding from the outer surface of the handle 15 projects from the rear surface of the handle 15 so as to project from the positioning piece 15
b is formed.

In order to fix the display substrate 23 to the handle 15, first, the tip of the holding projection 65 is inserted into the through hole 23a provided in the display substrate 23 as shown in FIG.
Since the holding protrusion 65 is formed with the split groove 68, the gap between the split grooves 68 is reduced, so that the holding portion 6 is formed in the through hole 23 a.
6 can be passed. When the holding portion 66 passes through the through hole 23a in this manner, as shown in FIG.
The split groove 68 is expanded by the elasticity of 5, and the display substrate 23 is prevented from falling off by the holding portion 66. In short, the holding projection 65 and the through hole 23a function as an engaging portion, and the handle 15 and the display substrate 23 are unevenly engaged. Also, the four circumferences of the display substrate 23 are aligned with the positioning pieces 15b.
Therefore, the rotation of the display substrate 23 with respect to the handle 15 is stopped. Thus, the display substrate 23 can be fixed to the handle 15 without using the screws 26. That is, the work of tightening the screw 26 is unnecessary, and the assembling work is facilitated. In addition, the shading due to the screw 26 is not formed, and the uneven display by the light emitting element 27 can be reduced. In this embodiment, four split grooves 68 are provided, but the same function can be obtained if three or more are provided. Other configurations and operations are the same as those of the first embodiment.

(Sixth Embodiment) As described in the related art, the return signal from the terminal to the transmission unit 41 is in the current mode, and the return signal is transmitted between the signal lines Ls in the terminal transmitting the return signal. Connect a suitable low impedance,
This is realized by absorbing a constant current in the terminal device. Since this current flows in a pulsed manner, the current flowing through the signal line Ls temporarily increases, but the average current is relatively small. Therefore, the maximum capacity of the circuit that generates the current mode return signal is designed to be relatively small. Specifically, as shown in FIG. 18, a transistor Q1 as a switching element is connected to the signal line Ls via a diode bridge DB for depolarization, and between the signal lines Ls via the diode bridge DB. And a series circuit of a resistor R1 as an impedance element. Signal processing circuit 70 for performing signal processing as a terminal device
By turning off the transistor Q1 with the output from the switch, a state in which the resistor R1 is inserted between the signal lines Ls and a state in which the resistor R1 is not inserted is selected. It can be sent to Ls. The signal processing circuit 70 mainly has a microcomputer.

However, if the signal processing circuit 70 goes out of control in the terminal device or the clock signal for causing the current to flow in pulses is stopped, a relatively large current continuously flows through the signal line Ls, and the transistor Q1 Or the resistor R1 may be destroyed by heat generation. In order to solve this kind of problem, the capacity of the transistor Q1 and the resistance R1 may be increased, but the margin is increased more than necessary, which leads to an increase in cost.

Also, an optical wireless signal is used at the time of setting an address in the terminal, and the light emitting element (infrared light emitting diode) 28a is used for the light emitting element 28a similarly to the return signal from the terminal to the transmission unit 41. A constant current is applied to In this circuit, as shown in FIG. 19, for example, a series circuit of a transistor Q2 as a switching element and a resistor R2 as an impedance element is connected in series to a light projecting element 28a composed of an infrared light emitting diode. By turning on / off Q2, an optical wireless signal as an optical pulse is transmitted from the light projecting element 28a. Therefore, if the signal processing circuit 70 goes out of control, a current continuously flows through the light emitting element 28a, and the transistor Q2 and the resistor R2 may generate heat and be destroyed. To solve this problem, it is conceivable to increase the capacitance of the transistor Q2 and the resistor R2, but this leads to an increase in cost.

Conversely, in the circuit for receiving the optical wireless signal, as shown in FIG. 20, a series circuit of a light receiving element 28b composed of a photodiode and a resistor R3 is provided, and a potential at a connection point between the light receiving element 28b and the resistor R3 is provided. To the signal processing circuit 70
, The optical wireless signal can be received. In this configuration, the light receiving element 28b
When high-intensity extraneous light such as natural light enters the signal processing circuit 70, the signal processing circuit 70 may be saturated (especially, the amplifier circuit for amplifying the output of the light receiving element 28b is likely to be saturated), and the optical wireless signal can be received. It may disappear. To solve this problem, it is conceivable to lower the sensitivity by reducing the value of the resistor R3, but the reception range of the optical wireless signal becomes narrower and the power consumption increases.

The present embodiment proposes a configuration for solving the above-described problem.

First, a circuit for generating a return signal employs the configuration shown in FIG. As can be seen from a comparison with the circuit configuration shown in FIG. 18, a protection circuit for forcibly turning off transistor Q1 when the output from signal processing circuit 70 to transistor Q1 is continuously at H level is provided. It is a thing. This protection circuit includes a series circuit of resistors R11 and R12 for dividing the output of the signal processing circuit 70, and a capacitor C11 in parallel with the low-potential-side resistor R12.
To apply the voltage across the capacitor C11 to the base-emitter of the transistor Q11. The collector of the transistor Q11 is connected to the base of the transistor Q1, and the emitter of the transistor Q11 is commonly connected to one end of the resistor R1. Here, a resistor R4 is inserted between the base of the transistor Q1 and the signal processing circuit 70.

In this configuration, when the output of the signal processing circuit 70 is normal, the voltage across the capacitor C11 is prevented from turning on the transistor Q11, and the output of the signal processing circuit 70 is continuously at H level. In such a case, the values of the resistors R11 and R12 and the capacitor C11 are set so that the voltage across the capacitor C11 increases and the transistor Q11 is turned on. By adopting this configuration, when the output continuously goes to the H level due to the runaway of the signal processing circuit 70 or the like, the transistor Q11 becomes conductive and the transistor Q1 cannot be turned on.
It is possible to prevent the transistor Q1 and the resistor R1 from being broken by heat.

FIG. 13 shows this operation. FIG. 13A shows the output of the signal processing circuit 70, and FIG.
11 (that is, the voltage applied to the base of the transistor Q11). FIG.
Indicates the on / off state. The left half in FIG. 13 is normal, and since the pulse width of the pulse output from the signal processing circuit 70 is relatively small, the voltage across the capacitor C11 does not increase so much, and the transistor Q11 does not conduct. , Transistor Q1 is a signal processing circuit 7
It is turned on and off in response to a pulse from 0.

On the other hand, when the output of the signal processing circuit 70 goes to the H level as shown in the right half of FIG.
As shown in (b), since the voltage across the capacitor C11 increases and the transistor Q11 turns on, the transistor Q1 turns off as shown in FIG. 13C when the transistor Q11 turns on. That is, it is possible to prevent a current from continuously flowing through the transistor Q1 and the resistor R1.

The same applies to the circuit for driving the light emitting element 28a. As shown in FIG. 14, a transistor Q2 connected in series to the light emitting element 28a has a transistor Q2 similar to the protection circuit having the circuit configuration shown in FIG. A protection circuit having a function is added. The circuit shown in FIG. 14 includes a series circuit of resistors R13 and R14 for dividing the output from the signal processing circuit 70, and a capacitor C12 is connected in parallel with the low-potential-side resistor R14.
The voltage across capacitor C12 is applied to the base-emitter of transistor Q12. The collector of transistor Q12 is connected to the base of transistor Q2, and the emitter of transistor Q12 is commonly connected to one end of resistor R2. Here, a resistor R5 is inserted between the base of the transistor Q2 and the signal processing circuit 70. The operation is the same as that of the circuit configuration shown in FIG. 12. When the output from the signal processing circuit 70 continuously goes to the H level, the transistor Q12 is turned on and the transistor Q2 is kept off. .

As a technique for removing the influence of extraneous light such as natural light as described above in the light receiving element 28b, it is presumed that the optical wireless signal has a pulse shape while the extraneous light has a continuous change. It is conceivable to take advantage of these points. That is, as shown in FIG. 15, it is conceivable to insert the capacitor C13 into the path from the connection point between the light receiving element 28b and the resistor R3 to the signal processing circuit 70.
If the capacitor C13 is inserted, the signal component corresponding to the external light that is input almost continuously cannot pass through the capacitor C13. Therefore, even when the intensity of the external light is high, the saturation of the signal processing circuit 70 can be avoided. it can. That is, when the external light and the optical wireless signal are received at the same time, the potential of the connection point between the light receiving element 28b and the resistor R3 is changed to the level shown in FIG.
6 (a), the signal processing circuit 70
Since the direct current component of the signal input to is removed by the capacitor C13, only the component corresponding to the optical wireless signal is extracted as shown in FIG.

An operation terminal 43 employing the above-described configuration.
FIG. 17 shows an example of the configuration of FIG. However, in the illustrated example, a phototransistor that is less expensive than a pin photodiode is used as the light receiving element 28b, and an optical filter O that can separate external light and an optical wireless signal to some extent is provided on the light receiving element 28b.
An optical wireless signal is incident through F. An address storage unit 71 composed of an EEPROM for storing an address is connected to the signal processing circuit 70 having a microcomputer as a main component, and a switch circuit 72 for providing a monitoring input to the signal processing circuit 70 by operating a switch SW.
Is provided. Further, a display circuit 73 including the light emitting element 27 is also connected to the signal processing circuit 70.

The operation terminal 43 includes a transmission / reception circuit 74 for connection to the signal line Ls. A circuit for generating a current mode return signal in the transmission / reception circuit 74 is a series circuit of a transistor Q1 and a resistor R1. And the protection circuit prevents the transistor Q1 from being continuously turned on. The circuit for driving the light emitting element 28a is the same, and the light emitting element 28a, the transistor Q2 and the resistor R
2 and a protection circuit is provided to prevent the transistor Q2 from being continuously turned on. Further, as described as the conventional configuration, since the bipolar transmission signal Vs is constantly transmitted to the signal line Ls, the transmission signal Vs is rectified by the diode bridge DB provided for depolarization, and Power is supplied to the internal circuit by stabilizing the circuit 75. Further, the transmission signal Vs is half-wave rectified by some of the diodes constituting the diode bridge DB, and the resistor R6 and the Zener diode ZD
Thus, the transmission signal Vs of ± 24 V is converted into a voltage of 0-5 V and input to the signal processing circuit 70. As described above, since the signal processing circuit 70 has a microcomputer as its main configuration, the reset circuit 76 is also provided to reset the signal processing circuit 70 when the power is turned on.

The structure of this embodiment can be adopted in any of the first to fifth embodiments.

(Seventh Embodiment) In the sixth embodiment, an example is described in which a capacitor C13 and an optical filter OF are used so that the influence of extraneous light can be reduced and an optical wireless signal can be received. As described above, in an environment where the intensity of the external light is large and the potential at the connection point between the light receiving element 28b and the resistor R3 rises to near the power supply voltage, the optical wireless signal is input to the signal processing circuit 70 at a sufficient level. It becomes difficult to do. To solve this problem, a resistor R3
It is conceivable to set the resistance value of the resistor R3 to be small. However, as described in the sixth embodiment, when the resistance value of the resistor R3 is reduced, the power consumption increases and the gain also decreases. A configuration for reducing the size cannot be adopted.

Therefore, the present embodiment employs a configuration for amplifying the output of the light receiving element 28a as shown in FIG. In the illustrated example, a phototransistor having higher sensitivity (that is, a larger photocurrent) than a photodiode is used as the light receiving element 28b, and an optical wireless signal is transmitted through the optical filter OF to reduce the influence of extraneous light. It is made to enter. That is, by reducing the influence of extraneous light with the optical filter OF,
The potential at the connection point between the light receiving element 28b and the resistor R3 is prevented from rising to near the power supply voltage due to extraneous light. Further, in this embodiment, an amplifier circuit AMP is provided to amplify the signal that has passed through the capacitor C13. That is, even when the signal level is low, an optical wireless signal can be extracted by amplifying the signal with the amplifier circuit AMP.

Operation terminal 4 using the configuration of this embodiment
3 is shown in FIG. The configuration example shown in FIG.
The configuration example shown in FIG. 13 is only the presence or absence of the amplifier circuit AMP for amplifying the optical wireless signal received by the light receiving element 28b, and the other configuration is the same as that of the sixth embodiment.

(Eighth Embodiment) In this embodiment, a circuit for outputting a current mode return signal is configured as shown in FIG. 23, and a circuit for driving the light emitting element 28a is configured as shown in FIG. Things.

As shown in FIG. 23, the circuit for outputting the return signal includes not only the resistor R4 but also the capacitor C4 between the base of the transistor Q1 in which the resistor R1 is connected in series with the collector and the emitter and the signal processing circuit 70. Has been inserted. Further, a diode D4 having a cathode connected to a connection point between the resistor R4 and the capacitor C4 is provided, and an anode of the diode D4 is connected to a negative electrode (reference potential) of the internal circuit. In this configuration, since a differentiating circuit is formed by the capacitor C4 and the resistor R4, even if the output of the signal processing circuit 70 continuously goes to the H level, only the transistor Q1 is turned on at the time of rising, and the transistor Q1
Are not turned on continuously, and as a result, the transistor Q1 and the resistor R1 can be protected.

Similarly, in the circuit configuration shown in FIG. 24, a capacitor C5 is inserted between the base of the transistor Q2 for driving the light emitting element 28a and the signal processing circuit 70 together with the resistor R5. Capacitor C5
Form a differentiating circuit. The point where the cathode of the diode D5 is connected to the connection point between the resistor R5 and the capacitor C5, and the anode of the diode D5 is connected to the negative electrode of the internal circuit is the same as the circuit that outputs the return signal.
That is, in the configuration shown in FIG. 24, even if the output of the signal processing circuit 70 goes to the H level continuously,
2 does not turn on continuously. Other configurations and operations are the same as those of the sixth embodiment.

[0063]

According to the first aspect of the present invention, a plurality of terminals are connected to a transmission unit via a signal line, and transmission signals including address data and control data are time-divided from the transmission unit to each terminal. Transmission in a multiplexing manner, and transmission of control data generated based on monitoring data input by one of the terminals to another terminal corresponding to the terminal to which the monitoring data is input by address data An operation terminal device that is used in a remote monitoring and control system that controls a load by the other terminal device and that includes a switch for inputting monitoring data, wherein the container containing the switch and the switch are pressed. A handle made of a diffusely permeable material that is provided to be operated and is exposed on the front surface of the container, and is stored in the container facing the handle, and is turned on in response to the operation of the load; A light emitting element that changes its state according to the operation of the load, and the light from the light emitting element is transmitted by arranging the light emitting element within the handle of the diffusely permeable material. It is not necessary to provide a window in a place different from the handle, and the lighting state of the light emitting element can be visually recognized in a relatively large area which is almost the entire surface of the handle, so that it is easy to visually recognize the lighting state of the light emitting element. . As a result, even when a monitoring panel for monitoring the operation state of the load is configured by arranging a plurality of units collectively, there is no need to provide a separate display terminal, and the occupied area can be reduced. become.

According to a second aspect of the present invention, in the first aspect of the invention, a plurality of the light-emitting elements are provided corresponding to the handle, and even if the handle has a relatively large area, high brightness can be obtained. It can be displayed evenly.

According to a third aspect of the present invention, in the first aspect of the present invention, the light emitting element is mounted on a display substrate provided separately from a circuit substrate on which the switch is mounted, and the display substrate is connected to a handle. If the positional relationship between the light emitting element and the handle is kept constant when the handle is operated, it is possible to prevent the display state from being changed by the operation of the handle.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the handle and the display substrate are formed with an engaging portion for engaging the concave and convex with each other to hold the display substrate on the handle. The positioning of the display substrate is facilitated by engaging the handle with the display substrate.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the load is turned on and off by the switch.
One of the operation states can be selected, and the light emitting element emits different colors when the load is turned on and when the load is turned off. The difference in the emitted colors enhances the visibility of the operation state of the load.

According to a sixth aspect of the present invention, in the first aspect of the present invention, an address storage section comprising a non-volatile memory for holding the address and an optical wireless signal for writing and reading the address storage section are transmitted and received. A possible light emitting element and a light receiving element are provided, and the light emitting element and the light receiving element transmit and receive an optical wireless signal through the handle, and not only light from the light emitting element but also an optical wireless signal are transmitted through the handle. Therefore, the window for transmitting and receiving the optical wireless signal does not exist on the external appearance, and the external appearance is beautiful. Moreover, since no separate window for transmitting and receiving the optical wireless signal is provided, the area of the handle can be increased, and as a result, the display area of the light emitting element can be increased.

According to a seventh aspect of the present invention, in the first aspect of the invention, there is provided an embedded wiring device in which the vessel is disposed on the construction surface such that the rear portion is embedded in the construction surface and the front surface is exposed from the construction surface. Can be mounted on a mounting frame for fixing the mounting surface to the construction surface, the mounting frame is formed in a rectangular frame shape having a window, and three sets of device mounting means are provided in the longitudinal direction. The external dimension in the direction is 3 of the dimension in the longitudinal direction of the window hole.
It is formed in a size equivalent to one-half, and can be constructed by diverting the mounting frame for wiring equipment. In addition, since up to three pieces can be attached to the three mounting frames, the number of pieces to be attached to one place can be arbitrarily selected within a range of up to three pieces.
It becomes possible to attach it to a place.

According to an eighth aspect of the present invention, in the first aspect of the invention, there is provided an embedded wiring device in which the vessel is disposed on a construction surface such that a rear portion is embedded in the construction surface and a front surface is exposed from the construction surface. Can be mounted on a mounting frame for fixing the mounting surface to the construction surface, the mounting frame is formed in a rectangular frame shape having a window, and three sets of device mounting means are provided in the longitudinal direction. The external dimension in the direction is formed to a dimension corresponding to the dimension in the longitudinal direction of the window hole, and the mounting frame for the wiring device can be diverted for construction.

According to a ninth aspect of the present invention, in the first aspect of the present invention, a series circuit of a switching element and an impedance element is inserted between the signal lines, and the switching element is turned on and off according to the monitoring data. A circuit for transmitting a return signal in a current mode to the transmission unit, comprising a protection circuit for forcibly turning off the switching element when the on state of the switching element continues for a predetermined time. By providing the switching element, it is possible to prevent the switching element from being continuously turned on, and it is possible to use a switching element or a resistance having a small current capacity.

According to a tenth aspect of the present invention, in the sixth aspect of the present invention, a series circuit of the light projecting element, the switching element, and the impedance element is inserted between both ends of a power supply, and the switching element is turned on and off. And a protection circuit for forcibly turning off the switching element when the on state of the switching element continues for a predetermined time.By providing the protection circuit, the switching element is continuously turned on. It can be prevented from turning on, and a switching element or a resistor having a small current capacity can be used.

According to an eleventh aspect of the present invention, in accordance with the sixth aspect of the present invention, a capacitor inserted in an output path of the light receiving element so as to extract a signal corresponding to an optical wireless signal by removing a DC component from the output of the light receiving element. Is provided.
Even if external light enters the light receiving element, the optical wireless signal can be separated and extracted, and the address can be set by the optical wireless signal even in a bright place.

According to a twelfth aspect of the present invention, in the sixth aspect of the present invention, a capacitor inserted in an output path of a light receiving element so as to extract a signal corresponding to an optical wireless signal by removing a DC component from an output of the light receiving element. And an amplifying circuit that amplifies the signal extracted through the capacitor. The optical wireless signal can be separated and extracted even when external light enters the light receiving element. Address setting becomes possible. In particular, even when the external light is strong and the difference from the optical wireless signal is small, the possibility that the optical wireless signal can be detected can be increased by separating and amplifying the signal corresponding to the optical wireless signal.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of the present invention.

FIG. 2 is a front view showing a state where the above is mounted on a mounting frame.

FIG. 3 is a partially cutaway side view showing a state where the above is mounted on a mounting frame.

FIG. 4 is a front view showing an example of use of the above.

FIG. 5 is an exploded perspective view showing a second embodiment of the present invention.

FIG. 6 is an exploded perspective view showing a third embodiment of the present invention.

FIG. 7 is a front view showing an example of use of the above.

FIG. 8 is an exploded perspective view showing a fourth embodiment of the present invention.

FIG. 9 shows a handle used in the fifth embodiment of the present invention, wherein (a) is a bottom view, (b) is a rear view, and (c) is a side view.

FIGS. 10A and 10B show a state in which the display substrate is being attached to the handle in the same manner, where FIG. 10A is a bottom view and FIG. 10B is a rear view.

11A and 11B show a state in which the display substrate is attached to the handle in the above, where FIG. 11A is a bottom view and FIG. 11B is a rear view.

FIG. 12 is a main part circuit diagram according to a sixth embodiment of the present invention.

FIG. 13 is an explanatory diagram of the operation of the above.

FIG. 14 is another main part circuit diagram of the same.

FIG. 15 is a circuit diagram of still another principal part of the above.

FIG. 16 is an operation explanatory view of the above.

FIG. 17 is a circuit diagram showing an overall configuration of the above.

FIG. 18 is a circuit diagram showing a comparative example of the above.

FIG. 19 is a circuit diagram showing a comparative example of the above.

FIG. 20 is a circuit diagram showing a comparative example of the above.

FIG. 21 is a main part circuit diagram according to a seventh embodiment of the present invention.

FIG. 22 is a circuit diagram showing the overall configuration of the above.

FIG. 23 is a main part circuit diagram in an eighth embodiment of the present invention.

FIG. 24 is another circuit diagram of the main part of the above.

FIG. 25 is a block diagram showing a conventional example.

FIG. 26 is an explanatory diagram of the above operation.

FIGS. 27A and 27B show the operation terminal device used in the embodiment, FIG. 27A is a front view, and FIG. 27B is a front view with a decorative cover attached.

FIG. 28 is a front view showing an example of use of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Mounting frame 15 Handle 21 Circuit board 23 Display board 23a Through hole 27 Light emitting element 28a Light emitting element 28b Light receiving element 41 Transmission unit 42 Operation terminal 43 Control terminal 44 Display terminal 51 Window hole 53 Appliance Mounting hole 65 Holding projection 71 Address storage unit 74 Transmission / reception circuit 75 Power supply circuit C11 to C13 Capacitor Q1, Q2 Transistor R1, R2 Resistance R11 to R14 Resistance Q11, Q12 Transistor AMP Amplifier circuit Ls Signal line SW switch

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 5K048 AA04 AA11 BA07 BA51 CB01 DA02 DB04 DC04 EB01 EB02 EB03 FB10 FB15 FB16 GC02 HA01 HA02 HA05 HA07 HA11 HA20

Claims (12)

[Claims] 1. A plurality of terminals are connected to a transmission unit via a signal line, and a transmission signal including address data and control data is transmitted from the transmission unit to each terminal in a time division multiplexing manner. The control data generated based on the monitoring data input by the terminal is transmitted to another terminal associated with the address data with respect to the terminal to which the monitoring data is input, and the other terminal is transmitted to the other terminal. An operation terminal device that is used for a remote monitoring control system that controls a load according to the present invention and includes a switch that inputs monitoring data, a container housing the switch, and a switch that is provided to operate the switch. A handle made of a diffusely permeable material exposed on the front surface of the body, and a light-emitting element which is housed in the body facing the handle and whose lighting state changes according to the operation of the load And a terminal for operating a remote monitoring and control system. 2. The operation terminal according to claim 1, wherein a plurality of the light emitting elements are provided corresponding to the handle. 3. The operation terminal according to claim 1, wherein the light-emitting element is mounted on a display board provided separately from a circuit board on which the switch is mounted. 4. The remote monitoring and control system according to claim 3, wherein the handle and the display board are formed with an engaging portion that engages and recesses with each other to hold the display board to the handle. Operation terminal. 5. The load is capable of selecting two operation states, on and off, by the switch, and the light emitting element has different emission colors when the load is on and off. An operating terminal for the remote monitoring and control system according to claim 1. 6. An address storage unit comprising a nonvolatile memory for holding the address, a light emitting element and a light receiving element capable of transmitting and receiving an optical wireless signal for writing and reading the address storage unit, 2. The operation terminal of claim 1, wherein the light emitting element and the light receiving element transmit and receive an optical wireless signal through the handle. 7. The mounting body can be mounted on a mounting frame for fixing an embedded wiring device disposed on the construction surface to the construction surface such that the rear portion is embedded in the construction surface and the front surface is exposed from the construction surface. The attachment frame is formed in a rectangular frame shape having a window, and includes three sets of instrument attachment means in a longitudinal direction.
2. The remote monitoring and control system according to claim 1, wherein an outer dimension of the container in a lateral direction is formed to a dimension corresponding to one third of a longitudinal dimension of the window. Terminal device. 8. The body can be attached to a mounting frame for fixing an embedded wiring device provided on the construction surface to the construction surface such that a rear portion is embedded in the construction surface and a front surface is exposed from the construction surface. The attachment frame is formed in a rectangular frame shape having a window, and includes three sets of instrument attachment means in a longitudinal direction.
2. The terminal for operation of a remote monitoring and control system according to claim 1, wherein an outer dimension in a lateral direction of the container is formed to a dimension corresponding to a longitudinal dimension of the window. 9. A current mode return signal is transmitted to a transmission unit by inserting a series circuit of a switching element and an impedance element between the signal lines and turning on and off the switching element according to the monitoring data. 2. A terminal for operation of a remote monitoring and control system according to claim 1, further comprising a protection circuit for forcibly turning off the switching element when the on state of the switching element continues for a predetermined time. . 10. A circuit for transmitting an optical wireless signal by inserting a series circuit of the light projecting element, the switching element, and the impedance element between both ends of a power supply and turning on and off the switching element. 7. The terminal according to claim 6, further comprising a protection circuit for forcibly turning off the switching element when the ON state continues for a predetermined time. 11. A capacitor inserted in an output path of a light receiving element to remove a DC component from an output of the light receiving element and extract a signal corresponding to an optical wireless signal. Terminal for remote monitoring and control system. 12. A capacitor inserted in an output path of a light receiving element so as to extract a signal corresponding to an optical wireless signal by removing a DC component from an output of the light receiving element, and an amplifier for amplifying a signal extracted through the capacitor. The operation terminal of claim 6, further comprising a circuit.