Abstract:
This invention relates to an apparatus and method for controlling operation of electric appliances ( 4   a,    4   b,    4   c ). The apparatus comprises electric appliances ( 4   a,    4   b,    4   c ) and at least one control unit ( 3 ) for controlling control circuits ( 10   a,    10   b,    10   c ) each containing at least one electric appliance ( 4   a,    4   b,    4   c ), further comprising first relays ( 1   a,    1   b,    1   c ) detecting radiated signals ( 8 ) and transmitting signals to control unit ( 3 ), and at least one first transducer ( 14 ) emitting said radiated signal ( 8 ) in the detection range of the first relays ( 1   a,    1   b,    1   c ), and each first relay ( 1   a,    1   b,    1   c ) is arranged close to a corresponding appliance ( 4 a,  4   b,    4   c ), and said signal is an impulsing signal ( 9 ) for activate or passivate said control circuits.

Description:
TECHNICAL FIELD  
       [0001]     This invention relates to an apparatus for controlling operation of electric appliances, comprising at least one electric appliance and at least one control unit for controlling at least one control circuit containing at least one electric appliance, and, the apparatus further comprising at least one first relay being adapted to detect a first radiated signal as well as to transmit a second signal to said control unit when received said signal, and at least one first transducer being able to emit said radiated signal emitted in the detection range of said first relay.  
       BACKGROUND ART  
       [0002]     Providing rooms of a building with electrical appliances the switching points of electrical devices are formed in a fixed manner that is the switches belonging to different electric consumers (lamps, darkening blinds, radiators, alarm systems, etc.) are placed in predetermined places. According to the simplest solutions these appliances have got a single switching place, where a wall-switch or a group of wall-switches are mounted. Where it is not sufficient to create a single switching place for an electric consumer (i.e. lighting of lobbies, foyers, staircases, etc) two or more equivalent switching points used to form for the same electric consumer. However, providing numerous switching places results in increasing the number of wires and other accessories, nevertheless it is not sure, that one can perfectly solve the problem of optimal wiring. On account of later rearrangement of appointments of the room, or on account of changing its function or for other purpose the switch must be transferred to an other place, or must be connected to an other electric consumer. These requirements inspired different remote control systems (infrared or radio frequency systems) providing a simpler way to accomplish switching from almost any place inside a predetermined reach. However, these systems have complicated installing features and cause different operating troubles in other electric devices and last but not least these systems have required special remote-control equipment provided with different buttons each having a single switching function and in many case these equipment were able for using in a predetermined place or for controlling predetermined devices only. Therefore, like the conventional arrangement, this solution also does not enable to define accurately the real function of the buttons or switches. Thence frequently happens in a flat or house that one turns the switches at random to find out their function, i.e. to find the switch connected to the chandelier desired to turn on.  
         [0003]     The so called bus systems are more intelligent and flexible than the solution above and they fill better the changing of requirements, rearrangement of connections and setting “switching patterns” are easier in this case, where predetermined actors (acting elements) are activated by receiving a signal of a sensor. However, programming a very complex bus system is time consuming and requires serious technical support and skills, moreover, it is very difficult to define the actual function of a switching device, and even block diagrams used to programming such a system do not serve a clear overview on the exact functions of the switching devices. A further disadvantage of the bus systems is the requirement of planning the switching pattern in advance, and this plan is often failed to be perfect or begins to date time to time and requires adaptation at least in part.  
         [0004]     U.S. Pat. No. 6,037,721 discloses a light dimming system comprising a fixture housing adapted for mounting in a ceiling and said fixture housing having an interior volume and an open bottom. A dimming ballast is fixed within interior volume of the fixture housing, and at least one lamp is mounted within the interior volume of the fixture housing and connected to the ballast. A fixture lens extending across the bottom of fixture housing is provided, and a radiation receiver circuit fixed within fixture housing interior volume has a radiation sensor, the radiation receiver is connected to dimming ballast interiorly of the fixture housing and containing a dimmer control circuit therein and being operable to adjust the output of the dimming ballast to the at least one lamp in response to the reception of a coded radiation signal by the radiation sensor. The system further contains a portable hand-operated radiation transmitter for transmitting radiation toward the radiation sensor from a position removed from the fixture housing, to adjust the dimming level of the lamp by adjusting the output of the radiation receiver. Elongated radiation lens having one end is disposed adjacent the radiation sensor and a free end disposed in a position which is flush with or penetrates beyond a bottom of the fixture lens.  
         [0005]     The disadvantage of above solution, that during controlling the lamp (or any electric consumer) the portable hand-operated radiation transmitter must be continuously directed toward the radiation receiver till the desired effect (e.g. brightness) has been obtained. Its further disadvantage, that all consumers have an integral radiation receiver and a dimmer control circuit. Therefore this solution is expensive and excludes the possibility of simultaneously controlling several different electric consumers.  
         [0006]     French Patent document No. FR 2731290 discloses a system having a compact, portable input device, which transmits a laser beam. An image acquisition system, with an objective is used to monitor a limited area including the laser beam impact spot when the input device is directed toward the area. A picture analyser determines the presence and position of the spot in the area, and relates those information with corresponding time data. An output device, which can be a micro-controller, associates the obtained temporal information to corresponding command signal. An operator interface is provided to input data required for associating obtained information to desired command signals. This can take the form of a task look-up table used to select the function or mode to be activated and to pass electronic signals to the apparatus to be controlled. The interface includes a keyboard, a screen, and a memory.  
         [0007]     Main disadvantage of this solution is similar to those mentioned in connection with the U.S. Pat. No. 6 037 72, that is the laser beam must be continuously directed toward the objective of the picture analyser till an adequate number of flashes has been produced to obtain the desired effect, e.g. one flash means turning on the device and two flashes mean a continuous dimmering up or down of the brightness.  
         [0008]     Both solutions outlined above hardly enable to use effectively these control systems by a user being nervous or in a hurry or having physical disability.  
       DISCLOSURE OF INVENTION  
       [0009]     The present invention provides an apparatus for controlling operation of electric appliances, comprising at least one electric appliance and at least one control unit for controlling at least one control circuit containing at least one electric appliance, and the apparatus further comprising at least one first relay being adapted to detect a first radiated signal as well as to transmit a second signal to said control unit when received said signal, and at least one first transducer being able to emit said radiated signal emitted in the detection range of said first relay, and said first relay is arranged close beside at least one electric appliance, and said signal transmitted to the control unit is an impulsing signal functioning as to activate or to passivate a control circuit containing at least one electric appliance associated with said first relay, and the apparatus further comprising at least one second transducer and at least one second relay transmitting a control signal adapted for controlling said control circuit activated by said impulsing signal, and the second transducer being able to emit a signal in the detection range of said second relay. The terms “activate” and “passivate” in this specification actually mean turn on and turn off, respectively. Therefore an activated control circuit is ready to be adjusted or controlled.  
         [0010]     In a preferred embodiment of the present invention said impulsing signal is also functioning as a signal to passivate a control circuit antecendently activated and controlled, and passivation of the antecendently activated and/or controlled control circuit will be achieved by an erasure signal emitted by the second transducer, and at least one physical property of said erasure signal is different from that of radiated signal, for example in regard of its frequency.  
         [0011]     In a highly advantageous embodiment of the present invention said control unit is provided with a time metering means, which is able to measure a Δt interval passed between starting instants of two following impulsing signals or control signals, and further provided with a memory means storing t o  passivating time, and the activated control circuit will be passivated in case of equality of said Δt interval and the stored t o  passivating time.  
         [0012]     In addition, in a preferred embodiment of the invention, a group of activated control circuits might be formed by a programming signal emitted by the second transducer, and at least one physical property of said programming signal is different from that of radiated signal, for example in regard of its frequency.  
         [0013]     The control unit is preferably provided with a memory means for creating a common control circuit unifying control circuits controlled simultaneously, and the signal emitted in the detection range of the second relay is an infrared or a radio-frequency signal radiated into all directions of the space, or a signal sent on wire.  
         [0014]     However, according to the invention, the signal radiated in the detection range of said first relay is preferably an infrared signal radiated at a small angle, and having a detection range different from that of said second relay, and said signal radiated in the detection range of said first relay is a laser beam.  
         [0015]     The first transducer advantageously comprises a portable remote control unit, and the second transducer comprises a portable remote control unit or a fixed device, but if it is desired the first transducer and the second transducer may be unified in a single portable remote control unit.  
         [0016]     Preferably the first transducer and the second transducer might be set in action simultaneously, and the action time of the first transducer is possibly limited in time.  
         [0017]     Advantageously the first transducer and the second transducer are successively set in action, and the first relay is provided with a beacon-light and/or a designation back indicator light, and/or an indicator indicating the status of an electric appliance associated therewith. The beacon-light is formed as a pictorial information of said electric appliance and/or the designation back indicator light is created by changing of predetermined properties of said beacon-light.  
         [0018]     In addition, to solve problems arisen in connection with the solutions of the state of the art, the inventors also provided a method for controlling operation of at least one (or more) electric appliance(s) by means of at least one control unit for controlling at least one control circuit containing at least one electric appliance, and by means of a first relay being adapted to detect a first radiated signal as well as to transmit a second signal to said control unit when received said signal, and providing at least one first transducer being able to emit said radiated signal emitted in the detection range of said first relay, the method further comprising the steps of 
        arranging said first relay close beside at least one electric appliance,     transmitting said second signal to the control unit as an impulsing signal functioning as to activate or to passivate a control circuit containing at least one electric appliance associated with said first relay,     providing at least one second transducer and at least one second relay transmitting a control signal adapted for controlling said control circuit activated by said impulsing signal, and     emitting a signal in the detection range of said second relay ( 2 ) by means of said second transducer ( 15 ).        
 
         [0023]     The method according to the present invention further comprising a step of applying said impulsing signal as a passivating signal for passivate the control circuit antecendently activated and controlled, and passivating the antecendently activated and/or controlled control circuit by an erasure signal emitted by the second transducer, and at least one physical property of said erasure signal being different from that of radiated signal, for example in regard of its frequency.  
         [0024]     According to the method, the control unit may be provided with a time metering means being able to measure an Δt interval passed from starting instant of last impulsing signal or control signal, and further provided with a memory means storing to passivating time, and the activated control circuit will be passivated in case of equality of said At interval and the stored t o  passivating time.  
         [0025]     Further, a group of activated control circuits might be formed by sending a programming signal emitted by the second transducer, but at least one physical property of said programming signal must be different from that of radiated signal, for example its frequency.  
         [0026]     In a preferred form the method according to the invention a common control circuit may be created, which unifies the designated control circuits by means of said programming signal sent to the control unit, and the signal emitted in the detection range of the second relay is an infrared or a radio signal radiated into all directions of the space, or a signal sent on wire.  
         [0027]     The signal radiated in the detection range of said first relay is an infrared signal radiated at a small angle, and it has a detection range different from that of said second relay. Preferably said signal radiated in the detection range of said first relay is a laser beam.  
         [0028]     Furthermore, said first transducer may be formed like a portable remote control unit, and also said second transducer may be formed as a portable remote control unit or a fixed device.  
         [0029]     However, said first transducer and the second transducer may be unified in a single portable remote control unit. The first transducer and the second transducer is advantageously set in action simultaneously, and the action time of the first transducer might be limited in time. 
     
    
       [0030]     The advantageous embodiments of the apparatus and method according to the invention will be represented by means of attached drawing. In the drawing  
         [0031]      FIG. 1 . is a schematic switching pattern of an advantageous embodiment of the apparatus according to the present invention, provided with three electric consumers,  
         [0032]      FIG. 2 . shows a schematic view of a remote control unit to be used in an advantageous embodiment of the present invention,  
         [0033]      FIG. 3 . shows the front view of an embodiment of a first relay to be used in the apparatus according to the invention. 
     
    
     DETAILED DESCRIPTION  
       [0034]     The advantageous embodiment of the apparatus according to the present invention shown on  FIG. 1 . is provided with electric appliances  4   a,    4   b,    4   c  or consumers. The apparatus may be used in a closed area, for example in a bedroom or a kitchen, office, hotel room, theatre or the like, although it might also be arranged in an open-air area like the place of different shows, concerts, performances, demonstrations, field-meetings or outdoor theatre in a permanent or provisional manner. Managing the apparatus may be achieved by a person operating a portable remote control unit  6 . The apparatus shown on  FIG. 1 . consists of a control unit  3 , first relays  1   a,    1   b,    1   c,  a second relay  2 , electric appliances  4   a,    4   b,    4   c  and preferably a single remote control unit  6  provided with a first transducer  14  and a second transducer  15 . Each first relay  1   a,    1   b,    1   c  is advantageously arranged close beside an electric appliance  4   a,    4   b,    4   c  in such a position, that all first relays  1   a,    1   b,    1   c  can clearly be realised by a person operating the apparatus and the inherence of a relay and the appliance associated thereto can directly be recognised. For example, beside a floor lamp in a bedroom is arranged a first relay  1   a,    1   b,    1   c  on the wall or in the lamp-stand. Each first relay  1   a,    1   b,    1   c,  is connected to the control unit  3  instead of appliances  4   a,    4   b,    4   c,  i.e. by means of wires buried in the wall, or by means of air cables, but preferably by radio contact. Individual shaping of first relays  1   a,    1   b,    1   c,  might be different. In a preferred embodiment shown in the  FIG. 3 . the first relay  1   a,    1   b,    1   c  is a flat board  7  having a flat or lightly convex/concave surface, which are mounted i.e. to the wall close beside the appliance  4   a,    4   b,    4   c  (or a group of appliances  4   a,    4   b,    4   c  to be chosen to adjust together). However, the shape of a first relay may also be of a circle, or a quadrangle, or a polygon clinging to the wall surface in order to obtain a highly aesthetic effect and, in addition, it might be provided with a beacon-light  23  and/or a designation back indicator light  24 , and/or an indicator indicating the status of an electric appliance  4   a,    4   b,    4   c  associated therewith. These lights are helpful in one hand to find a relay  1   a,    1   b,    1   c  in a dark room and in other hand they give some information about operation of relays  1   a,    1   b,    1   c.  The function of relays  1   a,    1   b,    1   c  is to send a coded impulsing signal  9  to the control unit  3 , when a radiated signal  8  has been received. Detecting the impulsing signal  9  the control unit  3  activates a control circuit  10   a,    10   b,    10   c  containing one (or more) electric appliance(s)  4   a,    4   b,    4   c  as well as the control unit  3  itself, namely that control circuit  10   a,    10   b,    10   c,  which contains the electric appliance  4   a,    4   b,    4   c  situated close beside the first relay  1   a,    1   b,    1   c  sending said coded impulsing signal  9 . At the same time, in a preferred embodiment of the apparatus according to the present invention, said impulsing signal  9  passivates the control circuit  10   a,    10   b,    10   c  antecendently activated. In such a way, only the lastly activated control circuit  10   a,    10   b,    10   c  can be operated by the user. In another preferred embodiment of the apparatus according to the present invention said impulsing signal  9  does not passivate the control circuit  10   a,    10   b,    10   c  antecendently activated. In such a manner it is possible to simultaneously operate several control circuits  10   a,    10   b,    10   c  previously chosen. In this case the antecendently activated control circuit(s)  10   a,    10   b,    10   c  will be passivated by means of a control signal  11  emitted by the second relay  2 . Instead of passivating by control signal  11  or impulsing signal  9  it is further possible to passivate the antecendently activated/operated control circuit(s)  10   a,    10   b,    10   c  by means of: 1) a time metering means  25  measuring an interval Δt passed between two following impulsing signals and 2) a memory means  26  storing a predetermined passivating time t o , both built in the control unit  3 . Such a way the passivation of activated control circuit(s)  10   a,    10   b,    10   c  can be obtained when said interval Δt passed from last impulsing signal  9  or control signal  11  and said predetermined passivating time t o  are equal.  
         [0035]     The second relay  2  can be placed arbitrarily within the effective radius  13  of the remote control unit  6 , since in a preferred embodiment the second transducer  15  built in the portable remote control unit  6  and emitting the second radiated signal  12  emits the latter into all directions of the space. In case of placing the control unit  3  within the effective radius  13  of the remote control unit  6  (i.e. in a room), the second relay  2  may be aggregated into the control unit  3 . If this aggregation is impossible or unfeasible for a reason of architecture or the like, the connection between said second relay  2  and control unit  3  might be achieved by means of wires or radio-signals. Duration of control signal  11  emitted by the second relay  2  toward said control unit  3  is advantageously equal to the duration of signal  12  emitted by the second transducer  15 . However, it is possible to emit a very short signal  12  instructing a control circuit  10   a,    10   b,    10   c  to operate in a predetermined manner, i.e. to reach a predetermined level of brightness.  
         [0036]     Said first transducer  14  arranged in the portable remote control unit  6  preferably emits a laser beam or a series of laser impulses or infrared radiation as radiated signal  8 . In the case of emitting infrared radiation, this radiation is emitted in a narrow angular region, and the detection range of said first relays  1   a,    1   b,  has to differ from the detection range of the second relay  2 . Said second transducer may be arranged in a separate remote control unit, but preferably it can be unified with the first transducer  14  within said portable remote control unit  6 . Advantageously, the radiated signal  12  of said second transducer  15  is an infrared or radio signal radiated in all directions of the space for the safe receiving of the radiated signal  12  by the second relay  2 . If the first transducer  14  and the second transducer  15  are not unified in the portable remote control unit  6  the latter contains only the first transducer  14 , and the second transducer  15  might be arranged in a separate remote control unit or it may be fixed in any part of the room (i.e. on a wall surface beside the door etc.) provided with the apparatus according to the present invention. In this case the radiated signal  12  of the second transducer  15  might be replaced by a signal transferred on a wire. It is also possible, that the radiated signal  12  of second transducer  15  could be a laser beam. In this case we need a single transducer  15  (i.e. a laser beam source) making the form and use of the remote control unit  6  very simple.  
         [0037]     As mentioned above both transducers  14  and  15  may be unified in a single remote control unit  6 . In the latter case there is a possibility to operate both transducers  14  and  15  at the same time. The main advantage of this solution is to operate both transducers  14  and  15  contemporaneously, i.e. by pressing a common control button  16 , that is the dimmering of the designated electric appliance  4   a,    4   b,    4   c  (in generally adjusting its performance or power) will start immediately when a control circuit  10   a,    10   b,    10   c  of the control unit  2  became activated by the impulsing signal  9  of the first relay  1   a,    1   b,    1   c  belonging to said appliance  4   a,    4   b,    4   c.  Note, that the effect obtained by this solution is the same, than the effect obtained by said solution according to the state of the art, but in the case of the solution according to the present invention there is no need to hold a signal source toward a desired first relay  1   a,    1   b,    1   c  during all the time of a power control procedure. It is also needless that the radiated signal  9  is to be a continuous one for a longer time period, since a moment is enough to detect the radiated signal  9  by the first relay  1   a,    1   b,    1   c.  Consequently, the length of the radiated signal  9  might be confined to a short length adequate to the first relay  1   a,    1   a,    1   c  be securely “catch” by the user. At the same time it also is possible to operate the first and second transducers  14 ,  15  separately, i.e. by control buttons  17 ,  18 ,  19  further arranged on the portable remote control unit  6 . In this case the control button  17  is to operate the first transducer  14 , and control buttons  18 ,  19  are to operate the second transducer  15  into two control direction, i.e. dimmering up and down. A further control button  20  may be arranged to cancel the designation of a control circuit  10   a,    10   b,    10   c.    
         [0038]     The present invention further provides a method, that can be achieved by the apparatus disclosed above, and the method may be used in a closed area, for example in a bedroom or a kitchen, office, hotel room, theatre or the like, although it might also be arranged in an open-air area like the place of different shows, concerts, performances, demonstrations, field-meetings or outdoor theatre. A preferred form of the method according to the invention may be achieved by a person operating said first transducer  14  and said second transducer  15  both transducers  14  and  15  built in a portable remote control unit  6 , so that pressing the control button  16  the user sends a radiated signal, i.e. a laser beam, from the first transducer  14  toward a first relay  1   a,    1   b,    1   c,  in order to designate an electric appliance  4   a,    4   b,    4   c  arranged close to said first relay  1   a,    1   b,    1   c.  This operation may also be achieved on entering a dark room, since the board  7  of the first relay  1   a,    1   b,    1   c  may preferably be provided with a beacon-light  23  and/or a designation back indicator light  24 . In a preferred embodiment a beacon-light  23  is a permanent lighting signal, for example showing the pictogram of the electric appliance  4   a,    4   b,    4   c  attached thereto, and a designation back indicator light  24  is a light flashing up in the moment of the designation, as well as lighting permanently during active state of the control circuit  10   a,    10   b,    10   c.  The designation back indicator light  24  is advantageously performed by variation or change of a feature (i.e. colour) of the beacon-light  23 , but designation of an electric appliance may also be indicated by intermittent flashing of the beacon-light  23 . In addition, first relay  1   a,    1   b,    1   c  can be provided with means for indicating control state of electric appliance  4   a,    4   b,    4   c  attached thereto, i.e. a display showing actual volume value of a radio or preadjusted temperature range of a heating device.  
         [0039]     In a following step first relay  1   a,    1   b,    1   c  sends a coded radiated signal  9  toward said control unit  3 , which therefore activates one of control circuits  10   a,    10   b,    10   c  containing electric appliances  4   a,    4   b,    4   c  and control unit  3  itself, and naturally activates that control circuit  10   a,    10   b,    10   c,  which contains electric appliance  4   a,    4   b,    4   c  situated next to the first relay  1   a,    1   b,    1   c  sending said radiated signal  9 . In a preferred embodiment of the method according to the present invention said impulsing signal  9  passivates the control circuit  10   a,    10   b,    10   c  antecendently activated. In such a way, only the lastly activated control circuit  10   a,    10   b,    10   c  can be operated by the user. In another preferred embodiment of the method according to the present invention said impulsing signal  9  does not passivate the control circuit  10   a,    10   b,    10   c  antecendently activated. In such a manner it is possible to simultaneously operate several control circuits  10   a,    10   b,    10   c  previously chosen.  
         [0040]     Second relay  2  sends a control signal  11  toward control unit  3 , and duration of said control signal  11  is equal to the duration of the radiated signal  12  emitted by the second transducer  15 , that is further equal to the duration of pressed state of control button  16 . Following, the user does not have to direct the remote control unit  6  toward the first relay  1   a,    1   b,    1   c  and, pressing the control button  16 , he/she can turn away from the first relay  1   a,    1   b,    1   c,  since the second relay  2  must be within the radiation distance  13  of the second transducer  15  arranged in the remote control unit  6  and emitting radiated signal  12  all around the space, and the beacon light  23  flashed on the first relay  1   a,    1   b,    1   c  shows to the user the fact of designation thereof.  
         [0041]     Releasing control button  16  the user can terminate adjusting the performance of appliances  4   a,    4   b,    4   c  and might possibly designate another appliance(s)  4   a,    4   b,    4   c.  In this moment the lastly activated and/or controlled control circuit(s)  10   a,    10   b,    10   c  must be passivated. This passivation can be achieved by several action according to the present invention. In a preferred embodiment said control circuit  10   a,    10   b,    10  may be passivated by means of a newer impulsing signal  9  or a control signal  11 . An erroneous or unintentional designation can be cancelled by pressing control button  20 . In the case of operating control button  20  the second transducer  15  emits a radiated signal having different feature—i.e. frequency, than that of the radiated signal  12 . This radiated signal will be considered by the control unit  3  as a passivating command to passivate all control circuits  10   a,    10   b,    10   c  already designated and therefore these control circuits  10   a,    10   b,    10   c  will be passivated by the control unit  3 .  
         [0042]     There is a possibility to control a plenty of electric appliances  4   a,    4   b,    4   c  simultaneously. In this case in the one hand a predetermined passivating time t o  can be stored (anytime previously) in the memory means  26  built in into the control unit  3  and in the other hand an interval Δt passed between two following impulsing signals  9  or control signals  11  will be measured. The passivation of previously activated control circuit(s)  10   a,    10   b,    10   c  can be obtained when said interval Δt passed from last impulsing signal  9  or control signal  11  and said predetermined passivating time t o  are equal, that is Δt=t o . In this case the previously activated and controlled control circuit(s)  10   a,    10   b,    10   c  will not be passivated by virtue of said impulsing signal  9  emitted by the first relay  1   a,    1   b,    1   c.  Therefore, if Δt&lt;t o , the previously activated and controlled control circuit(s)  10   a,    10   b,    10   c  remain(s) activated and both said consumer(s)  4   a,    4   b,    4   c  may be controlled simultaneously, indeed. This way several consumers or electric appliances  4   a,    4   b,    4   c  may be controlled simultaneously provided that to said interval Δt passed from last impulsing signal  9  or control signal  11  Δt&lt;t o  is true. If Δt&gt;t o , the previously activated and controlled control circuit(s)  10   a,    10   b,    10   c  must be passivated automatically. These designated groups of electric appliances  4   a,    4   b,    4   c  can be stored in a memory  22  of control unit  3  by means of a programming signal initiated by pressing a control button  21 . In this case a radiated signal  8  sent to any first relay  1   a,    1   b,    1   c  belonging to a consumer  4   a,    4   b,    4   c  within a programmed group will generate an impulsing signal  9  forwarded to the control unit  3  and designating all consumers  4   a,    4   b,    4   c  belonging to said programmed group. Deleting memory  22  by means of pressing control button  21  the user can reset the system. Pressing said control button  21  the second transducer  15  emits a radiated signal having different feature, like frequency, than that of the radiated signal  12 . This radiated signal will be considered by the control unit  3  as a deleting command to delete memory  22 . By adjusting the length of said deleting signal one can also be determined whether the previously designation only or all active designations must be deleted. For example: by means of a short deleting signal the lastly designated control circuit  10   a,    10   b,    10   c  will be deleted only and a longer signal deletes all previously designated and active control circuits  10   a,    10   b,    10   c.    
         [0043]     The principal advantage of the apparatus and method according to the present invention is its easy use, flexibility and simple build up of said remote control unit  6 , since it is not necessary to know the exact place of first relays  1   a,    1   b,    1   c  in the room and only the designations delimit the operation of electric appliances  4   a,    4   b,    4   c.    
         [0044]     Further advantage of the system is a possibility to omit a time consuming programming of a very complex bus system, because we do not have to determine in advance whether which control circuits  10   a,    10   b,    10   c  must be activated by a first relay  1   a,    1   b,    1   c,  but the latter sends the address of said control circuit  10   a,    10   b,    10   c  or activates the control circuit  10   a,    10   b,    10   c  itself, so that the control signal can operate only the designated control circuit and therefore the consumers belonging thereto.  
         [0045]     Further advantage of the present invention is that even in a most complex situation the remote control unit has to contain at most six control buttons  16 ,  17 ,  18 ,  19 ,  20 ,  21  only. Therefore it is easy to operate and to produce, and the remote control unit can be held by anybody in his pocket and it can be used at home, at the workplace, hotels and on holiday, etc. because of its standardisable signals.