Patent Publication Number: US-2020294393-A1

Title: Multi-state device having communication links with a remote control with identifying capabilities

Description:
FIELD 
     The invention relates to the field of connecting a definite multi-state device to a remote control and, in particular, connecting a device configured to switch from one state to another state to a remote control with the purpose for a user to make the multi-state device switch from one state to another state remotely from the remote control. The invention concerns a device configured to be connected to a remote control and a method for connecting such a multi-state device to said remote control. It further concerns a method for activating and/or deactivating a change state controller of the multi-state device. Although many of the features of this invention will be described in relation to a smoke detector, or more generally a detector of a species, it is understood that they are generally applicable to many other devices such as any sensor or the like, as also mentioned in the examples. 
     BACKGROUND 
     In many countries, the installation of smoke detectors has become mandatory in buildings and residences. The installation of a smoke detector allows detecting smoke emitted at the start of a fire. The smoke detector immediately emits a sound signal that is noisy enough to wake up a sleeping person. The smoke detector must conform to predetermined standards, for example the standard NF EN 14604 in Europe. There are detectors specially adapted for deaf people, using a light signal and/or vibrating signal. 
     The installation of such devices has proven to be a life saving measure, as the warning signal generally alerts people within the structure, to evacuate the building, residence in a timely manner. Very early detection allows to save lifes as well as to minimize fire effects as an alarm is raised at the very beginning of the problem. 
     It may happen that the smoke detector emits a sound signal even if there is no fire in the residence. For example, it is the case when cooking, and smoke escapes from the cooking device. The sound signal which is noisy enough to be heard in any situation is particularly upsetting. The user may stop the sound signal by switching the smoke detector off. Since smoke detectors should be placed in the vicinity of the room ceiling, it is not necessarily within the user&#39;s reach who may then use an extension, like a broom handle, to try to reach the switch of the smoke detector to switch the alarm off. This solution is absolutely not satisfying. 
     It is advantageous to be able to activate/deactivate the alarm of the smoke detector using a remote control, for example thanks to a signal sent from the remote control to the smoke detector. But this solution does not comply with the security requirements and may lead to a dangerous situation. Indeed when sending the RF signal to switch off the alarm of a smoke detector, for example, in the living-room, a smoke detector in a neighboring room may catch the signal and its alarm may be then switched off, which is not in accordance with the intention of the user. Seeing no effect on the alarm of the smoke detector of the living-room, the user may send the same signal again and this time, the alarm of the smoke detector of the living-room may be switched off, without being aware of the fact that the alarm of the smoke detector of the neighboring room is also switched off. 
     SUMMARY OF THE INVENTION 
     A solution to overcome this drawback is to ensure that the remote control interacts with a device selected by the user and not with another one. The invention aims at providing a device able to send an identifying code to the remote control configured to send this identifying code back to the device, to assure the user that he/she has designated the intended device. The invention also aims at providing a device switching from a state to another state after the request of the remote control, when the remote control is connected to this device. 
     To this end, the subject of the invention is a multi-state device comprising a communication port configured to receive a stimulus from a remote control, a transmitter of an identifying code on a line-of-sight carrier, a controller configured to one or more of compare an identifying code received from the remote control to the identifying code of the multi-state device or make the multi-state device switch from one state to another state. 
     Advantageously, the multi-state device comprises a communication link configured to receive the identifying code from the remote control. Advantageously, the communication link is a RF communication link. Advantageously the communication link is configured to receive a change state command from the remote control to activate the controller to make the multi-state device switch from the one state to the another state. 
     According to an embodiment of the invention, the multi-state device is a detector of a species comprising an alarm to be set on when the multi-state device detects the species and off otherwise, the one state being one of the alarm being off or the alarm being on and the another state being then the alarm being on or the alarm being off. 
     According to another embodiment of the invention, the multi-state device is a presence sensor comprising an alarm to be set on when the multi-state device detects a presence in a room and off otherwise, the one state being one of the alarm being off or the alarm being on and the another state being then the alarm being on or the alarm being off. 
     According to another embodiment of the invention, the multi-state device is a presence sensor configured to send a signal to another equipment when the multi-state device detects a presence in a room and to send no signal otherwise, the one state being one of no signal to be sent or the signal to be sent and the another state being then the signal to be sent or no signal to be sent. 
     According to another embodiment of the invention, the multi-state device is an opening comprising a lock to be in a locked position when the multi-state device is in the locked position and in an unlocked position otherwise, the one state being one of the unlocked position or the locked position and the another state being then the locked position or the unlocked position of the lock. 
     According to another embodiment of the invention, the multi-state device is a lamp having a light on when the multi-state device is in a on position and a light off when the multi-state device is in an off position, the one state being one of the off position or the on position and the another state being then the on position or the off position. 
     Advantageously, the remote control is a smart phone configured to receive the identifying code on a line-of-sight carrier, wherein the smart phone comprises a transmitter of an identifying code, the identifying code sent through the transmitter being identical to the identifying code on the line-of-sight carrier of the multi-state device. 
     The invention also relates to a remote control configured to connect to a multi-state device configured to receive from the multi-state device an identifying code on a line-of-sight carrier, a transmitter of an identifying code, configured to communicate with the multi-state device the identifying code of the multi-state device. Advantageously the remote control is configured to send a change state command to activate or deactivate a controller of the multi-state device, to make the multi-state device switch from one state to another state after the communication with the multi-state device of the identifying code of the multi-state device. 
     The invention also relates to a method of controlling a multi-state device using a remote control, the method comprising the steps of receiving through a communication port of the multi-state device a stimulus from the remote control, transmitting from the multi-state device to the remote control an identifying code of the multi-state device using a line-of-sight carrier, transmitting from the remote control to the multi-state device a code, comparing in a controller of the multi-state device the code received from the remote control to the identifying code of the multi-state device. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings illustrate various non-limiting, example, innovative aspects in accordance with the present descriptions: 
         FIG. 1  schematically represents a first embodiment of a device configured to communicate with a remote control according to the invention; 
         FIG. 2  schematically represents a second embodiment of a device configured to communicate with a remote control according to the invention; 
         FIG. 3  schematically represents a third embodiment of a device configured to communicate with a remote control according to the invention; 
         FIG. 4  schematically represents a fourth embodiment of a device configured to communicate with a remote control according to the invention; 
         FIG. 5  represents a block diagram of the steps of a method for communicating of a device with the remote control according to the invention; 
         FIG. 6  represents a block diagram of the steps of a method for remotely activating and/or deactivating a switch of the device from a remote control according to the invention; 
     
    
    
     For the sake of clarity, the same elements have the same references in the various figures and the different aspects of embodiments can be combined when appropriate. 
     DETAILED DESCRIPTION 
     As previously mentioned, although many of the features of this invention are described in relation to a smoke detector, it is understood that they are generally applicable to a detector of a species, chemical compound or reaction. In this case, the term species is to be understood as a species like smoke or as a chemical species or molecule such as carbon monoxide, AmO2 or other chemical compounds or reactions used for smoke detectors. Moreover, these features are also applicable to many other devices such as sensors or the like, as further mentioned in the examples. In case of some sensors, the alert module may be a separated module or the remote control itself. 
     More generally the invention relates to a multi-state device and a remote control configured to send a signal to the multi-state device. The invention ensures that the user remotely designates the intended multi-state device with the remote control. 
       FIG. 1  schematically represents a first embodiment of a device  10  configured to communicate with a remote control  14  according to the invention. The device  10  is a multi-state device. The multi-state device  10  is configured to receive a stimulus from a remote control  14 . The multi-state device  10  may comprise a communication port  13  configured to receive one or more of a stimulus or a change state command from the remote control  14 . The multi-state device  10  comprises a transmitter  15  of an identifying code  16  using a line-of-sight carrier, a controller  17  configured to one or more of compare an identifying code received from the remote control  14  to the identifying code  16  of the multi-state device or make the multi-state device  10  switch from one state  11  to another state  12 . The switch is triggered after a communication of an identifying code  16  between the multi-state device  10  and the remote control  14  through the RF communication link and the transmitter  15 . The communication port may be wired or wireless. As an example, the communication port may be an RF communication link. It can be Wi-Fi, NFC or Bluetooth. It is also possible to add a module for other RF bands/protocols. Or the communication port may be via a web server, with a connection of the smoke detector to a web server (wired or wireless) and the remote control is connected to the web server. The line-of-sight carrier may be an infrared beam or any optical signal that can be caught by the remote control, either through a specific receiver or through a camera. 
     The multi-state device  10  represented in  FIG. 1  is as example a smoke detector that can switch from one state to another state, i.e. from the state on to the state off and/or from the state off to the state on. 
     A user may wish to switch off the smoke detector  10  placed in the kitchen, before cooking, to avoid the alarm of the smoke detector to be triggered on if some smoke escapes from a cooking equipment when in operation. In this case, the user only wants the smoke detector  10  placed in the kitchen to be switched off. Alternatively, the smoke detector  10  may be temporarily switched off thanks to a time out that automatically puts the smoke detector on beyond a predetermined time lapse after being switched off. The smoke detectors placed in the other rooms should be kept on. It is therefore necessary to ensure that the user designates the smoke detector  10  of the kitchen, when sending the request to switch off. 
     First, the user has to connect the multi-state device  10  to the remote control  14 , in a secure manner. The steps of the method for connecting the multi-state device  10  (smoke detector) to the remote control  14  are illustrated in  FIG. 5 . The method for connecting the multi-state device  10  to the remote control  14  comprises a step  100  of receiving through the communication port  13  of the multi-state device  10  a stimulus from the remote control  14 , a step of communicating between the remote control  14  through the RF communication link and the multi-state device  10  through the transmitter  15  of an identifying code  16 . 
     The step of communicating between the remote control  14  and the multi-state device  10  of the identifying code  16  may be divided into a step  101  of emitting by the transmitter  15  of the multi-state device  10  the identifying code  16  using a line-of-sight carrier, a step  102  of receiving by the remote control  14  of the identifying code  16  on a line-of-sight carrier, and a step  103  of emitting by the remote control  14  of the identifying code  16  to the communication link of the multi-state device  10 , so as to ensure the connecting of the remote control  14  to the multi-state device  10 . 
     The step of communicating between the remote control  14  and the multi-state device  10  of the identifying code  16  may be also divided into a step  101  of emitting by the remote control  14  the identifying code  16  to the RF communication link of the multi-state device  10 , a step  102  of receiving by the transmitter  15  of the multi-state device  10  of the identifying code  16 , and a step  103  of emitting by the transmitter  15  of the multi-state device  10  of the identifying code  16 , so as to ensure the connecting of the remote control  14  to the multi-state device  10 . 
     The controller  17  of the multi-state device  10  is configured to make the multi-state device  10  switch from one state  11  to another state  12  after the step of communicating between the remote control  14  and the multi-state device  10  of the identifying code  16 . 
     In the example of the smoke detector in the kitchen, the user may want to connect the remote control  14  to the smoke detector  10  in the kitchen. The user sends via the remote control a stimulus to the smoke detector  10  in the kitchen. The stimulus may be sent using a dedicated key on the remote control. For example, in case the remote control is a smart phone, the user may use a dedicated application on the smart phone. This stimulus is a stimulus configured to be received by the RF communication port  13  of the smoke detector  10 . The RF communication port  13  of the smoke detector  10  receives this stimulus and sends as a response through its transmitter  15  to the remote control  14  the identifying code  16  on a line-of-sight carrier. The remote control  14  receives the identifying code  16  on a line-of-sight carrier. And the remote control  14  sends the identifying code  16  to the RF communication port  13  of the smoke detector  10 . This corresponds to a communication of the identifying code  16  between the remote control  14  and the smoke detector  10 , using a line-of-sight carrier on the one hand and on a link on the other hand. In a more industrial environment, the communication of the identifying code may be ciphered to improve security. It is thus ensured that the remote control  14  is now connected to the smoke detector  10  in the kitchen since they exchanged the same identifying code  16 . 
     The RF communication port  13  of the multi-state device  10  is advantageously configured to receive a change state command from the remote control  14  to activate the controller  17  to make the multi-state device  10  switch from the one state  11  to the another state  12 . 
     In our previous example, once the remote control  14  is connected to the smoke detector  10  in the kitchen after having exchanged the same identifying code  16 , the user is now able to switch off the smoke detector. The remote control  14  sends to the RF communication port  13  of the smoke detector  10  the change state command (in our example: switch the smoke detector  10  off) to activate the controller  17  of the smoke detector  10  to make the smoke detector  10  switch from the on-state to the off-state. 
     The example of the smoke detector  10  in the kitchen switched off before cooking is an example of a preventive use of the invention. The invention may also be applied in an active use of the smoke detector  10 , i.e. when the alarm is set on, as illustrated in  FIG. 1 , in order to deactivate the smoke detector to stop the sound signal (either in case of a false alarm or when the corresponding security measures were adopted). 
     The smoke detector can be totally deactivated via the invention, or only the alarm part of it (this could be useful in case of a deaf person who may want to change it for a visual alarm, for instance in a hotel room). 
     The smoke detector  10  comprises an alarm to be set on (state  12 ) when it detects smoke and off (state  11 ) otherwise. The smoke detector  10  has its alarm set off (state  11 ) on the left hand side of  FIG. 1 . When detecting smoke (as represented in the middle of  FIG. 1 ), the alarm of the smoke detector  10  is triggered on as a normal use of a smoke detector. The smoke detector  10  has its alarm set on (state  12 ) on the right hand side of  FIG. 1 . Being then aware of a fire, the user may call the fire department or try by himself to extinguish the fire. It may be no more necessary to hear the alarm of the smoke detector, in particular while talking with firemen on the phone. The user may then wish to switch the alarm to the state off (state  11 ). The user needs to connect the remote control  14  to the smoke detector  10  having its alarm on. The remote control sends a stimulus to this smoke detector  10 . The RF communication port  13  of the smoke detector  10  receives this stimulus and as a response sends through its transmitter  15  to the remote control  14  the identifying code  16  on a line-of-sight carrier. The remote control  14  receives the identifying code  16  on a line-of-sight carrier. And the remote control  14  sends the identifying code  16  to the RF communication port  13  of the smoke detector  10 . This corresponds to a communication of the identifying code  16  between the remote control  14  and the smoke detector  10 , using a line-of-sight carrier on the one hand and on an RF link on the other hand. It is thus ensured that the remote control  14  is now connected to the smoke detector  10  since they exchanged the same identifying code  16 . Then the remote control  14  sends to the RF communication port  13  of the smoke detector  10  a change state command to activate the controller  17  to make the smoke detector  10  switch from the one state  12  (alarm being on) to the another state  11  (alarm being off). 
     The invention was presented in  FIG. 1  with a smoke detector. Similarly, the multi-state device  10  can also be a detector of a species comprising an alarm to be set on when the multi-state device  10  detects the species and off otherwise, the one state  11  being one of the alarm being off or the alarm being on and the another state  12  being then the alarm being on or the alarm being off. The species can be for example carbon monoxide which is a colorless, odorless gas, and toxic to humans when encountered in concentrations above about  35  ppm, or nitrogen monoxide, or any species whose level is to be checked. 
     The invention enables to remotely control a multi-state device using a remote control while ensuring to designate the multi-state device that is to be controlled. The multi-state device according to the invention allows making sure that there is a remote communication with the desired device. The invention makes it possible to send a command to one particular device amongst a plurality of the same devices and to ensure the user he is designating the one particular device. 
       FIG. 2  schematically represents a second embodiment of a device configured to communicate with a remote control according to the invention. In this embodiment, the multi-state device  20  is a presence sensor comprising an alarm to be set on when the multi-state device  20  detects a presence in a room and off otherwise, the one state  11  being one of the alarm being off or the alarm being on and the another state  12  being then the alarm being on or the alarm being off. 
     In this embodiment, the user may want to switch the presence sensor  20  in his house (i.e. generally in one room) when coming back home. The user wants to connect the remote control  14  to the presence sensor  20  in the room to deactivate the presence sensor  20 . The remote control  14  sends a stimulus to the presence sensor  20 . This stimulus is a stimulus configured to be received by the RF communication port  13  of the presence sensor  20 . The RF communication port  13  of the presence sensor  20  receives this stimulus and as a response sends through its transmitter  15  to the remote control  14  the identifying code  16  on a line-of-sight carrier. The remote control  14  receives the identifying code  16  on a line-of-sight carrier. And the remote control  14  sends the identifying code  16  to the RF communication port  13  of the presence sensor  20 . This corresponds to a communication of the identifying code  16  between the remote control  14  and the presence sensor  20 , on a line-of-sight carrier on the one hand and on an RF link on the other hand. It is thus ensured that the remote control  14  is now connected to the presence sensor  20  in the room (and for example not to another presence sensor in another room or in the neighborhood) since they exchanged the same identifying code  16 . 
     The RF communication port  13  of the multi-state device  20  is advantageously configured to receive a change state command from the remote control  14  to activate the controller  17  to make the multi-state device  20  switch from the one state  11  to the another state  12 . 
     Once the remote control  14  is connected to the presence sensor  20  in the room after having exchanged the same identifying code  16 , the user is now able to switch off the presence sensor. The remote control  14  sends to the RF communication port  13  of the presence sensor  20  the change state command (in our example: switch the presence sensor  20  off). Afterwards the controller  17  of the presence sensor  20  is activated to make the presence sensor  20  switch from the state on to the state off. 
     Similarly to the smoke detector  10 , the user may want to deactivate the presence sensor  20  when its alarm is on. The presence sensor  20  comprises an alarm to be set on (state  12 ) when it detects a presence in its vicinity and off (state  11 ) otherwise. The presence sensor  20  has its alarm set off (state  11 ) on the left hand side of  FIG. 2 . When detecting a presence (as represented in the middle of  FIG. 2 ), the alarm of the presence sensor  20  is triggered on as a normal use of a presence sensor. The presence sensor  20  has its alarm set on (state  12 ) on the right hand side of  FIG. 2 . Being then aware of a presence in the room, the user may call at the police or check himself who is in the room or even simply notice that this is an animal that managed to come into the room and made the presence sensor set the alarm on. Depending on the situation, it may be no more necessary to hear the alarm of the presence sensor. In the case the user wishes to switch the alarm to the state off (state  11 ), the user needs to connect the remote control  14  to the presence sensor  20  having its alarm on. The remote control sends a stimulus to this presence sensor  20 . The RF communication port  13  of the presence sensor  20  receives this stimulus and as a response sends through its transmitter  15  to the remote control  14  the identifying code  16  on a line-of-sight carrier. The remote control  14  receives the identifying code  16  on a line-of-sight carrier. And the remote control  14  sends the identifying code  16  to the RF communication port  13  of the presence sensor  20 . This corresponds to a communication of the identifying code  16  between the remote control  14  and the presence sensor  20 , on a line-of-sight carrier on the one hand and on RF way on the other hand. It is ensured that the remote control  14  is now connected to the presence sensor  20  since they exchanged the same identifying code  16 . Then the remote control  14  sends to RF communication port  13  of the presence sensor  20  a change state command to activate the controller  17  to make the presence sensor  20  switch from the one state  12  (alarm being on) to the another state  11  (alarm being off). The alarm of the presence sensor  20  is then off. 
     It may be noted that a presence sensor may be configured to send a command to another equipment when it detects a presence, for example switch on a lamp and/or activate a heating system to regulate a room temperature. The invention operates as described before: the presence sensor comprises a command to be set on (state  12 ) when it detects a presence in its vicinity and off (state  11 ) otherwise. When detecting a presence (as represented in the middle of  FIG. 2 ), the command of the presence sensor  20  is triggered on and sent to the other equipment (for example a lamp or heating system to be set on). The presence sensor  20  has its command set on (state  12 ) on the right hand side of  FIG. 2 . In the case the user wishes to switch the command to the state off (state  11 ), the user needs to connect the remote control  14  to the presence sensor  20  having its command on the on-state. In other words, in the case the presence sensor is configured to send a command to another equipment, the invention operates in the same way as described before. In this particular case, the alarm is to be understood as a signal to be sent in the on-state (sound signal for an alarm or command to another equipment for the case of communication between the presence sensor and another equipment) and no signal to be sent in the off-state. 
       FIG. 3  schematically represents a third embodiment of a device configured to communicate with a remote control according to the invention. In this embodiment, the multi-state device  30  is an opening comprising a lock  38  to be in a locked position when the multi-state device  30  is in the locked position and in an unlocked position otherwise, the one state  11  being one of the unlocked position or the locked position and the another state  12  being then the locked position or the unlocked position of the lock. 
     In this embodiment, the user may want to lock the opening  30  (a door in the example of  FIG. 3 ) when leaving home without having to use a key of the lock. The user wants to connect the remote control  14  to the opening  30  to lock the opening  30 . The remote control  14  sends a stimulus to the opening  30 . This stimulus is a stimulus configured to be received by the RF communication port  13  of the opening  30 . The RF communication port  13  of the opening  30  receives this stimulus and as a response sends through its transmitter  15  to the remote control  14  the identifying code  16  on a line-of-sight carrier. The remote control  14  receives the identifying code  16  on a line-of-sight carrier. And the remote control  14  sends the identifying code  16  to the RF communication port  13  of the opening  30 . This corresponds to a communication of the identifying code  16  between the remote control  14  and the opening  30 , on a line-of-sight carrier on the one hand and on an RF link on the other hand. It is ensured that the remote control  14  is now connected to the opening  30  in the room (and not to another opening for example on another side of the house or in the neighborhood) since they exchanged the same identifying code  16 . 
     The RF communication port  13  of the multi-state device  30  is advantageously configured to receive a change state command from the remote control  14  to activate the controller  17  to make the multi-state device  30  switch from the one state  11  to the another state  12 . 
     Once the remote control  14  is connected to the opening  30  after having exchanged the same identifying code  16 , the user is now able to lock the opening. The remote control  14  sends to the RF communication port  13  of the opening  30  the change state command (in our example: lock the opening  30 ) to activate the controller  17  of the opening  30  to make the opening  30  switch from the state unlocked to the state locked. 
     Conversely, when coming back home, the user may want to unlock the opening  30 . In the case the user wishes to switch the position from the locked position (state  12 ) to the unlocked position (state  11 ), the user needs to connect the remote control  14  to the opening  30 . The remote control sends a stimulus to the opening  30 . The RF communication port  13  of the opening  30  receives this stimulus and as a response sends through its transmitter  15  to the remote control  14  the identifying code  16  on a line-of-sight carrier. The remote control  14  receives the identifying code  16  on a line-of-sight carrier. And the remote control  14  sends the identifying code  16  to the RF communication port  13  of the opening  30 . This corresponds to a communication of the identifying code  16  between the remote control  14  and the opening  30 , on a line-of-sight carrier on the one hand and on RF way on the other hand. It is ensured that the remote control  14  is now connected to the opening  30  since they exchanged the same identifying code  16 . Then the remote control  14  sends to RF communication port  13  of the opening  30  a change state command to activate the controller  17  to make the opening  30  switch from the one state  12  (locked position) to the another state  11  (unlocked position). The opening  30  is then in the unlocked position ( 11 ) and the user can open the opening  30 . 
     An example of a multi-state device with more than two states can be a thermostat for which the user sets the desired temperature in a range from 5 to 30° C. and wishes to designate one (or more) particular thermostat temperature in one (or more) particular room. After the communication between the remote control  14  and the multi-state thermostat through the RF transmitter  19  of the identifying code  16 , the multi-state thermostat is connected with the remote control and it is possible to make the multi-state thermostat switch from one state to one of the other possible states. 
       FIG. 4  schematically represents a fourth embodiment of a device configured to communicate with a remote control according to the invention. In this embodiment, the multi-state device  40  is a lamp having a light on when the multi-state device  40  is in an on position and a light off when the multi-state device  40  is in an off position, the one state  11  being the off position and the another state  12  being the on position. 
     In this embodiment, the user may want to turn the light on when entering the room in which the lamp is without having to use any light switch located somewhere on a wall. The user wants to connect the remote control  14  to the lamp  40  to put the lamp  40  in the on position. The remote control  14  sends a stimulus to the lamp  40 . This stimulus is a stimulus configured to be received by the RF communication port  13  of the lamp  40 . The RF communication port  13  of the lamp  40  receives this stimulus and as a response sends through its transmitter  15  to the remote control  14  the identifying code  16  on a line-of-sight carrier. The remote control  14  receives the identifying code  16  on a line-of-sight carrier. And the remote control  14  sends the identifying code  16  to the RF communication port  13  of the lamp  40 . This corresponds to a communication of the identifying code  16  between the remote control  14  and the lamp  40 , using a line-of-sight carrier on the one hand and on an RF link on the other hand. It is ensured that the remote control  14  is now connected to the right lamp  40  in the room (and not to another lamp for example on another corner of the room or in another room of the house) since they exchanged the same identifying code  16 . 
     The RF communication port  13  of the multi-state device  40  is advantageously configured to receive a change state command from the remote control  14  to activate the controller  17  to make the multi-state device  40  switch from the one state  11  to the another state  12 . 
     Once the remote control  14  is connected to the lamp  40  after having exchanged the same identifying code  16 , the user is now able to place the lamp in the on position. The remote control  14  sends to the RF communication port  13  of the lamp  40  the change state command (in our example: position on of the lamp) to activate the controller  17  of the lamp  40  to make the lamp  40  switch from the state off to the state on. 
     Conversely, when leaving the room, the user may want to put the lamp  40  in the off position. In the case the user wishes to switch the position from the on position (state  12 ) to the off position (state  11 ), the user needs to connect the remote control  14  to the lamp  40 . The remote control sends a stimulus to the lamp  40 . The RF communication port  13  of the lamp  40  receives this stimulus and as a response sends through its transmitter  15  to the remote control  14  the identifying code  16  on a line-of-sight carrier. The remote control  14  receives the identifying code  16  on a line-of-sight carrier. And the remote control  14  sends the identifying code  16  to the RF communication port  13  of the lamp  40 . This corresponds to a communication of the identifying code  16  between the remote control  14  and the lamp  40 , on a line-of-sight carrier on the one hand and on an RF link on the other hand. It is ensured that the remote control  14  is now connected to the lamp  40  since they exchanged the same identifying code  16 . Then the remote control  14  sends to RF communication port  13  of the lamp  40  a change state command to activate the controller  17  to make the lamp  40  switch from the one state  12  (on position) to the another state  11  (off position). The lamp  40  is then in the off position ( 11 ). 
     The invention also relates to a remote control  14  configured to connect to a multi-state device  10 ,  20 ,  30 ,  40 . The remote control  14  is advantageously configured to receive from the multi-state device  10 ,  20 ,  30 ,  40  an identifying code  16  on a line-of-sight carrier, and an RF transmitter  19  of an identifying code  16 . For example, the remote control may comprise a camera  18 . The remote control  14  is configured to send a change state command to activate or deactivate a controller  17  of the multi-state device  10 ,  20 ,  30 ,  40 , to make the multi-state device  10 ,  20 ,  30 ,  40  switch from one state  11  to another state  12  after the communication between the remote control  14  through the camera  18  and the multi-state device  10 ,  20 ,  30 ,  40  through the RF transmitter  19  of the identifying code  16 . 
     According to an embodiment of the invention, the remote control  14  is a smart phone, or a tablet, that may comprise a camera  18  configured to receive the identifying code  16  on a line-of-sight carrier, wherein the smart phone comprises an RF transmitter  19  of an identifying code  16 , the identifying code  16  sent through the RF transmitter being identical to the identifying code  16  on the line-of-sight carrier. The smart phone or the tablet enables to catch the identifying code  16  from the multi-state device and to send it back to the multi-state device via an RF transmitter. Such a remote control may contain a software application configurable to send a particular version of the identifying code to activate or deactivate the controller of the multi-state device depending on the various possibilities namely in the case of the multi-state device with more than two states. The remote control  14  may also be a server. 
     The remote control  14  comprises a conversion unit. This conversion unit converts the identifying code  16  on the line-of-sight carrier into the RF identifying code  16 . The RF identifying code  16  is then sent to the multi-state device through the RF transmitter  19  of the remote control  14 . Therefore, the same identifying code  16  with two different supports is exchanged between the remote control and the multi-state device. 
     When operating with various multi-state devices, each multi-state device sends through its transmitter  15  its own identifying code on a line-of-sight carrier. The remote control  14  receives the plurality of identifying codes on a line-of sight carrier, converts them into a plurality of RF identifying codes sent back to the multi-state devices. The controller of each multi-state device makes the multi-state device switch from one state  11  to another state  12  after the communication between the remote control  14  and the multi-state device of the same identifying code. Since each multi-state device sent its own identifying code on a line-of-sight carrier, each multi-state device receives then its own identifying code as an RF identifying code. Therefore the communication of the identifying codes is ensured, even if there are various multi-state devices. 
       FIG. 5  represents a block diagram of the steps of a method for communicating of a device with the remote control according to the invention. The method for communicating of a multi-state device  10 ,  20 ,  30 ,  40  with a remote control  14  according to the invention comprises the step  100  of receiving through the RF communication port  13  of the multi-state device  10 ,  20 ,  30 ,  40  a stimulus from the remote control  14  and a step of communicating between the remote control  14  through the RF communication port  13  and the multi-state device  10 ,  20 ,  30 ,  40  through the transmitter  15  of an identifying code  16 . Furthermore, the controller  17  is advantageously configured to make the multi-state device  10 ,  20 ,  30 ,  40  switch from one state  11  to another state  12  after the step of communicating between the remote control  14  and the multi-state device  10 ,  20 ,  30 ,  40  of the identifying code  16 . 
     As mentioned before, the step of communicating between the remote control  14  and the multi-state device of the identifying code  16  may be divided into a step  101  of emitting by the transmitter  15  of the multi-state device the identifying code  16  using a line-of-sight carrier, a step  102  of receiving by the remote control  14  of the identifying code  16  on a line-of-sight carrier, and a step  103  of emitting by the remote control  14  of the identifying code  16  to the RF communication port  13  of the multi-state device, so as to ensure the connecting of the remote control  14  to the multi-state device. 
     The step of communicating between the remote control  14  and the multi-state device of the identifying code  16  may be also divided into a step  101  of emitting by the remote control  14  the identifying code  16  to the RF communication port  13  of the multi-state device, a step  102  of receiving by the transmitter  15  of the multi-state device of the identifying code  16 , and a step  103  of emitting by the transmitter  15  of the multi-state device of the identifying code  16 , so as to ensure the connecting of the remote control  14  to the multi-state device. In other words, the communication between the remote control and the multi-state device may be initiated either by the remote control or by the multi-state device. 
       FIG. 6  represents a block diagram of the steps of a method for remotely activating and/or deactivating a switch of the device from a remote control according to the invention. Further to the steps of the method for communicating of a multi-state device with a remote control, the method for activating or deactivating further comprises a step  104  of receiving a change state command from the remote control  14  to activate or deactivate the controller  17 , to make the multi-state device  10 ,  20 ,  30 ,  40  switch from one state  11  to another state  12  after the communication between the remote control  14  through the RF communication link  13  and the multi-state device  10 ,  20 ,  30 ,  40  through the transmitter  15  of the identifying code  16 . 
     On top of ensuring that the user remotely designates the intended multi-state device with the remote control, the invention offers additional advantages. In particular, the invention offers the possibility to command various devices with the same remote control. The invention is easy to implement at a low cost. The strength of the invention is also to be underlined. Indeed it needs no further device than the remote control, thus reducing the risk of failure due to the use of many devices. In some embodiments, it can be only a dedicated application downloaded on a remote control (in particular in smartphone example). 
     The examples disclosed in this specification are therefore only illustrative of some embodiments of the invention. They do not in any manner limit the scope of said invention which is defined by the appended claims.