DE202014103791U1 - Drive system for a gate - Google Patents

Abstract

Drive system (1) for a gate (2), with a drive unit having an electric drive (6), by means of which the door (2) can be moved between a closed position and an open position, and with a radio receiver (14a) associated with the drive unit, which is designed to receive radio signals (15), characterized in that a hand-held transmitter (9) and the radio receiver (14a) are part of a bidirectional radio transmission path, wherein an operation command transmitted by the hand-held transmitter (9) in the form of radio signals (15) of the gate (2) is acknowledged without additional request by sending an acknowledgment signal in the form of further radio signals (15) via the bidirectional radio transmission path to the hand-held transmitter (9) on this command and displayed there.

Description

The invention relates to a drive system for a gate.

The drive system is generally used to operate a gate, that is to open and close a gate. The gate can generally be moved horizontally or vertically. For example, the door can be designed as a garage door, in particular as a sectional door. Furthermore, the gate can be designed as a terrain completion gate, for example in the form of a rotary or sliding gate.

Such drive systems generally include a drive unit with an electric drive to move the door between a closed position and an open position. The operation of the door is usually carried out such that radio signals are sent from a remote control to a radio receiver, which is assigned to the control unit of the drive system.

The radio receiver and the control unit form a stationary unit in the area of the gate. The handheld transmitter, on the other hand, is a mobile unit that a person can carry with them.

For example, in a drive system for a garage door, a person in their motor vehicle can carry the remote control with them. Thus, the person can already operate the hand-held transmitter during the approach to the garage so that the gate is already opened on the basis of the command generated when the motor vehicle approaches the garage, so that the person can drive into the garage without annoying waiting time.

However, a problem here is that the person still has no visual contact with the gate when pressing the remote control. Thus, the person can not be sure whether command transmitted with the hand-held transmitter has actually arrived at the radio receiver and the door has been opened.

The invention has for its object to provide a drive system which has increased functionality with little design effort.

To solve this problem, the features of claim 1 are provided. Advantageous embodiments and expedient developments of the invention are described in the subclaims.

The invention relates to a drive system for a gate and comprises an electric drive having a drive unit. The gate can be moved between a closed position and an open position. A radio receiver assigned to the drive unit is designed to receive radio signals. The hand-held transmitter and the radio receiver are part of a bidirectional radio transmission link. An instruction sent by the remote control in the form of radio signals to actuate the gate is acknowledged without additional request by sending an acknowledgment signal in the form of further radio signals via the bidirectional radio transmission path to the remote control and displayed there on this command.

The basic idea of the invention is therefore to expand the hitherto customary unidirectional radio transmission path of hand transmitters and radio receivers to a bidirectional radio transmission path. This bi-directional radio transmission path is exploited according to the invention in that an acknowledgment signal sent by the radio receiver to the hand-held transmitter, which is displayed to the operator on the hand-held transmitter, is sent back to a command transmitted by the hand-held transmitter as a radio signal without any further requirements, that is without further inputs on the hand-held transmitter that the operator can immediately recognize that the command has arrived at the radio receiver and is carried out accordingly.

The operator can thus, even if he has no eye contact with the gate, immediately recognize whether by a made by him pressing the remote control of the emitted by this command arrived at the radio receiver at the gate and the action desired by him has been triggered. This is only the case if the display on the remote control is activated by the acknowledgment signal on the remote control after the command has been sent. If the display is omitted, the operator knows that the command has not arrived at the radio receiver.

For example, in the case of a drive system for a garage door, the operator can already actuate the hand-held transmitter when approaching his garage if he does not yet have eye contact with the door. If he does not receive an acknowledgment signal upon actuation of the hand-held transmitter, the user knows that the hand-held transmitter was still outside the range of the radio receiver. The operator, when his motor vehicle has approached a little further to the garage, send out the command again with the remote control and can still conveniently open the garage door while the motor vehicle approaches the garage, so that the operator his car without annoying Waiting time can enter the garage.

With the acknowledgment signal according to the invention and its display thus the ease of use and thus the functionality of the drive system according to the invention is considerably increased.

Particularly advantageously, the feedback is generated directly on the respective command.

This means that the acknowledgment signal is generated in response to a command sent by the remote control transmitter, apart from the times required for the respective signal processing and signal transmission, immediately after receipt of the command from the handheld transmitter in the radio receiver and sent to the remote control. The operator of the hand-held transmitter can thus detect without noticeable delay on the basis of the display on the hand-held transmitter whether the command transmitted with the hand-held transmitter has arrived correctly at the radio receiver.

Advantageously, the radio receiver is part of a first radio transmitter / receiver unit. In the hand-held transmitter, a second radio transmitter / receiver unit is provided, wherein the radio transmitter / receiver units form the bidirectional radio transmission link.

In this case, the radio receiver and thus the first radio transmitter / receiver unit is assigned to a control unit which forms a stationary unit, wherein the second radio transmitter / receiver unit forms a freely movable unit with respect to the first radio transmitter / receiver unit through the integration in the hand transmitter.

In this case, the control unit evaluates the signals received by the radio receiver and emitted by the hand-held transmitter, in particular in order to convert these into control commands for opening or closing the door.

For example, the electric drive can be arranged on a carriage, which is coupled to the door and can be moved to close and open the door on a guide rail.

The control unit then controls the movement of the carriage in dependence on the radio signals registered at the radio receiver.

Furthermore, the control unit also controls the first radio transceiver unit in such a way that the acknowledgment signal, which is then sent back to the hand-held transmitter via the first radio transceiver unit, is generated in response to a command received at the radio receiver. Advantageously, it is not only checked in the control unit whether a command is actually registered on the remote control. Rather, there is also checked whether the command was received correctly and whether a permissible command is present. Only if the test is positive, the acknowledgment signal is generated and returned to the hand-held transmitter.

A code which is compared with codes which are compared in a memory unit assigned to the radio receiver is particularly advantageously contained in a radio signal emitted by the remote control. The code of the remote control is recognized as valid if it matches one of the stored codes.

In this case, the drive system can generally be extended to the effect that several remote controls are assigned to it. Then the codes of all remote controls are stored in the memory unit.

In such a drive system, an acknowledgment signal is generated only on a command of the remote control if the code of the remote control is recognized as valid, the acknowledgment signal is generated immediately when the code of the remote control is recognized as valid.

Advantageously, the acknowledgment signal contains the code of the remote control. In the hand-held transmitter, the acknowledgment signal is only displayed if the code of the hand-held transmitter is recognized in the acknowledgment signal.

Alternatively, the acknowledgment signal has a code assigned to the radio receiver. In the hand-held transmitter, the acknowledgment signal is only displayed if this code is recognized in the hand-held transmitter.

This ensures a high level of operating convenience when handling the remote control. The operator of the remote control needs for the desired operation of the door in a known manner only one actuator, such as pressing a button on the transmitter, whereby the command to operate the door is sent as a radio signal. The subsequent acknowledgment of the command, if it is recognized as valid at the radio receiver of the drive system, then takes place automatically, without the operator having to make further entries on the remote control.

A further advantage is that, by appending the code to the acknowledgment signal, the acknowledgment is recognized as valid only by the hand-held transmitter which has sent the command to the drive system and is accordingly also displayed there. Other hand transmitters which are assigned to the drive system thus do not indicate the acknowledgment signal, thereby avoiding misallocations in the feedback of radio signals.

The functionality of the acknowledgment of radio signals according to the invention can be further extended by the fact that when, by the operator of the remote control by pressing the control element emitted command of the hand-held transmitter is not acknowledged by an acknowledgment signal, in the hand-held transmitter automatically the command is transmitted again repeatedly.

Thus, the chance of success that a transmitter emitted by the remote control actually arrives at the associated drive system, significantly increased. In order not to overload the radio traffic, while the repetitions of the command in the transmitter are limited to a certain number, of course, the repetitions are aborted when an acknowledgment signal is received in the transmitter.

The display of the acknowledgment signal on the hand-held transmitter can be embodied in different configurations. For example, an optical or acoustic display may be provided, which remains activated after sending the acknowledgment signal to the remote control preferably for a predetermined period of time. Furthermore, it is possible that the remote control vibrates to display the acknowledgment signal.

According to an advantageous variant, the invention is extended to a multiple arrangement of drive systems. In this case, the individual drive systems and their associated handheld transmitter each have a radio transmitter / receiver unit. This radio transmitting / receiving unit form network nodes of a network such that a radio signal emitted by a radio transmitter / receiver unit and received by a second radio transmitter / receiver unit is automatically forwarded to a third radio transmitter / receiver unit. Of course, the third radio transmission / reception unit receives the further-transmitted signal only if it is located in the reception area of the second radio transmission / reception unit.

With this additional functionality of the automatic forwarding of radio signals, the range of the system is considerably increased. In addition, a secure, reliable function of the radio system is obtained.

If, for example, by pressing a button on a remote control a command to operate the associated gate in the form of a radio signal sent that does not go directly to the drive system for this gate, because the remote control is still too far away, so can by Hopfunktion invention, ie pass indirectly through the transmission of the radio signal via closer to the transmitter arranged radio transmitter / receiver units of other drive systems to the destination. The same applies to the acknowledgment signals as feedback for such commands.

The network nodes in such a network are advantageously formed only by those units whose radio transmitter / receiver units are permanently supplied with power. Thus, only the radio transceiver units in the area of the drive systems and the gates form network nodes of the network, but not the hand transmitters, which are only supplied with power via batteries and, if the hand transmitters are not actuated, operated in a standby mode.

Collisions in the transmission of various radio signals are avoided by known methods in radio transmission technology, such as "Listen before talk", or time slot method.

In order not to excessively burden the radio traffic by the hop function according to the invention, the number of hops, that is to say relaying of radio signals from one radio transmitter / receiver unit to another radio transmitter / receiver unit, is limited.

For this purpose, the radio signal transmitted by the radio transmitter / receiver unit advantageously contains a counter reading, the counter reading being read out in the radio transmitter / receiver unit receiving the radio signal, then being incremented and written to the radio signal as a new counter reading before it is transmitted from the other transmitter transmitter. / receiving unit is resent. A retransmission of the radio signal is carried out by the further radio transmitter / receiver unit only if the read count is below a limit.

The drive system according to the invention can be used for gates of all kinds, in particular vertically and horizontally moving gates.

The invention will be explained below with reference to the drawings. Show it:

1 : Schematic representation of a drive system for a garage door.

2 : Schematic representation of a remote control transmitter according to the drive system 1 ,

3 : Schematic representation of the bidirectional radio transmission path of the drive system of 1 and 2 ,

4 : Timing diagrams of signals transmitted via the bidirectional radio transmission path and the display unit controlled thereby.

5 : Multiple arrangement of drive systems according to 1 ,

1 schematically shows a drive system 1 for a goal 2 , which is formed in the present case as a garage door in the form of a sectional door.

The gate 2 is on both edges in each case a guide rail 3 guided. Every guide rail 3 has a rail segment running in the vertical direction and a rail segment running in the horizontal direction. The horizontal and vertical rail segments are connected by a curved rail segment.

1 shows the gate 2 in its closed position, in which the gate 2 between the vertical rail segments of the guide rail 3 is arranged and closes a door opening of the garage. In an open position is the gate 2 between the horizontal rail segments of the guide rail 3 arranged under the ceiling of the garage.

By means of the drive system 1 can the gate 2 be moved between the closed position and the opening position.

The drive system 1 has one on one of the guide rails 3 movable door operator 4 as part of a drive unit, the one in a carriage 5 integrated electric drive 6 , that is electric motor, has. The door drive 4 is by means of a push arm 7 hinged to the upper edge of the gate 2 connected.

Furthermore, the drive system includes 1 as part of the drive unit, a control unit 8th , via unillustrated power supply means with the door drive 4 connected is. The control unit 8th , which is mounted in the present case on the inside of a wall of the garage as a stationary unit, generates control signals for moving the door drive 4 , The control commands are from one or more remote controls 9 read, with such a transmitter 9 in 2 is shown schematically.

The remote control 9 has one in a housing 9a integrated computer unit 10 on, as well as an attached to this actuator in the form of a button 11 , Generally, you can also use several buttons 11 be provided. The computer unit 10 may be formed by a microprocessor or the like.

Between remote controls 9 and control unit 8th a bidirectional data transmission takes place. This is on or in the control unit 8th a first radio transmitter / receiver unit 12a intended. In the transmitter 9 there is a second radio transmitter / receiver unit 12b , The two radio transmitter / receiver units 12a . 12b form a bidirectional radio transmission links, which in 3 is illustrated. The first radio transceiver unit 12a has a radio transmitter 13a and a radio receiver 14a on. Accordingly, the second radio transmitter / receiver unit also has 12b a radio transmitter 13b and a radio receiver 14b on. This allows between these two radio transceiver units 12a . 12b bidirectional radio signals 15 be transmitted.

The remote control 9 also has a display unit 16 on. The display unit 16 can be designed as an optical or acoustic display. In the present case, the display unit 16 formed by a vibrating element. When activating this display unit 16 the vibration element generates vibrations that are on the housing 9a for a hand transmitter 9 can be felt in the hand holding operator.

The second radio transmitter / receiver unit 12b and the display unit 16 be from the computer unit 10 controlled.

To operate the gate 2 An operator presses the button 11 of the remote control 9 , whereupon the radio transmitter 13b the second radio transmission / reception unit 12b as a radio signal 15 a corresponding command to the first radio transceiver unit 12a at the control unit 8th sends. The control unit 8th evaluates the command and generates a control command to move the gate 2 For example, around the gate 2 to open. Furthermore, the control unit generates 8th immediately upon receipt of the command on the radio receiver 14a the first radio transmitter / receiver unit 12a an acknowledge signal that acknowledges the orderly receipt of the command. Without further request and without further delay, as the timing diagram of 4 points to the transmission of the command from the transmitter 9 (in 4 denoted by A), the acknowledgment signal to the remote control 9 sent back (with the acknowledgment signal in 4 denoted by B). The acknowledgment signal at the radio receiver 14b the second radio transmission / reception unit 12b of the remote control 9 is registered in the computer unit 10 registered, whereupon this immediately the display unit 16 controls and activates, so that at this the receipt of the acknowledgment signal by a vibration signal (in 4 labeled C) is displayed. This display is advantageously carried out for a predefinable period of time, wherein this is selected so that an operator displays this on the remote control 9 can safely register. In the control unit 8th the acknowledgment signal is only generated if at the radio receiver 14a the first radio transmitter / receiver unit 12a a command from the remote control 9 is received correctly and completely.

Based on the output of the acknowledgment signal on the display unit 16 can thus be an operator of the remote control 9 Immediately recognize whether the command triggered by him correctly from the transmitter 9 in the radio receiver 14a the first radio transmitter / receiver unit 12a was transferred. Thus the operator can also without eye contact to the gate 2 check that of him with the remote control 9 generated command is actually executed.

Usually, the drive system 1 for the gate 2 several remote controls 9 assigned, allowing the gate with either one of the handheld transmitters 9 can be operated.

To a clear assignment of the remote control 9 to the drive system 1 is in every command of a remote control 9 , which is sent out as a radio signal, the remote control 9 uniquely identifying code, in particular its serial number. The codes of the remote controls 9 that the drive system 1 are assigned, are stored in a memory unit that the radio transmitter / receiver unit 12a of the drive system 1 assigned. The storage unit is advantageously integrated in the control unit.

Used by the radio transmitter / receiver unit 12b a handheld transmitter 9 then a command to the radio transmitter / receiver unit 12a of the drive system 1 sent, first a validity check takes place in which the code of the transmitter 9 emitted radio signal with the codes that are stored in the memory unit to be compared. The code of the remote control 9 is recognized as valid if it matches a stored code.

If the code was recognized as valid, on the one hand the command of the hand-held transmitter 9 executed, that is the gate 2 is opened or closed. On the other hand, the acknowledgment signal is generated on the command, whereby the code of the hand-held transmitter is sent to the acknowledgment signal 9 is attached. If the acknowledgment signal is then sent out, the hand-held transmitter can 9 , who has originally sent the command to recognize the associated acknowledgment signal on the basis of a code, so that the acknowledgment signal only on this remote control 9 is displayed, but not on other remote controls 9 that also receive the acknowledgment signal at random.

The functionality of the acknowledgment can be generalized to the effect that after pressing the key 11 a handheld transmitter 9 not only sends out a command once. Rather, the transmission of the command is automatically repeated at predetermined intervals, until the command in the drive system 1 is received and generates the acknowledgment signal and the transmitter 9 is shown. In order not to overload the radio traffic, the repeated transmission of the command is limited to a maximum number of repetitions. Then the command was still not from the drive system 1 is received and the acknowledgment signal is not yet generated, the automatic transmission of the command is aborted.

5 shows an extension of the invention to a multiple arrangement of drive systems 1a to 1c , where the individual drive systems 1a to 1c the embodiment of the drive system 1a to 1c from 1 correspond. Furthermore, in 5 a handheld transmitter 9 which embodiment of the 2 equivalent. The Einfachhalthalber are in 5 only the garages for the drive systems 1a to 1c but not the components of the drive systems 1a to 1c even.

In the arrangement of 5 constitute the constantly powered radio transceiver units 12a the drive systems 1a to 1c Network node of a network. The radio transceiver units 12b the hand transmitter (s) 9 on the other hand, they are supplied with batteries and are, as long as no button 11 on the transmitter 9 is operated, in standby mode. Thus these form radio transmitter / receiver units 12b no network nodes of the network.

In the arrangement of 5 is the transmitter 9 the drive system 1c assigned, that is with the remote control 9 can only be the gate of the drive system 1c be operated. At the in 5 However, the arrangement shown is outside the range of the drive system 1c , Rather, the transmitter is 9 only within the range of the radio transmitter / receiver unit 12a of the drive system 1a ,

However, since a hop function is realized with the network, which allows an automatic forwarding of radio signals, the hand transmitter 9 emitted command (marked I) indirectly by forwarding the command in front of the drive system 1a to the drive system 1b (marked with II) and subsequent forwarding from the drive system 1b to the drive system 1a (marked by III) but to the drive system 1c reach. The acknowledgment signal generated there reaches the handheld transmitter in the same way 9 ,

The hop function is realized in such a way that each network node, that is each radio transmission / reception unit 12a a drive system 1a to 1c checks whether a received command is valid, that is from an assigned remote control 9 comes. If this is the case, an acknowledgment signal is generated and with the code of the remote control 9 sent back to them. If the command is recognized as not valid, it will be forwarded without an acknowledgment signal, so that it from one possibly in the reception area of the radio transmitter / receiver unit 12a arranged further radio transmission / reception unit 12b another drive system 1 is received, where this process is repeated.

The number of forwardings is limited in a simple manner by a meter reading contained in the radio signal with which the distributions are counted.

Will be in the range of 5 by pressing the key 11 of the remote control 9 the radio signal I first sent, so it contains the count Z = 0. Will then the radio signal from the radio transmitter / receiver unit of the drive system 1a received, the count Z is first compared with a threshold value G, which is G = 3 in the present case. If the counter reading is still below the limit, the count of the radio signal in the radio transmitter / receiver unit 12a of the drive system 1a around 1 increases, and the radio signal is the next drive system 1b forwarded where the meter reading again 1 is increased.

In the drive system 1b the counter reading is after increase by 1 now Z = 2. Since this count is still below the limit G = 3, the radio signal is again to the next drive system 1a forwarded.

Generally, in a radio transceiver unit 12a . 12b the radio signal is only forwarded as long as the current counter reading is still below the limit value.

In the present case, the arrangement of 5 In the case of multiple signal forwarding, the limit value for the counter reading is not reached, so that that of the hand-held transmitter 9 emitted radio signal via the drive systems 1a . 1b to the destination, that is the drive system 1a can get. Likewise, the acknowledgment signal arrives from the drive system 1a via the drive systems 1b . 1a back to the transmitter 9 ,

LIST OF REFERENCE NUMBERS

1

 drive system

1a-1c

drive system

2

 gate

3

 guide rail

4

 door drive

5

 carriage

6

 electric drive

7

 push arm

8th

 control unit

9

 transmitter

9a

 casing

10

 computer unit

11

 button

12a

 first radio transmitter / receiver unit

12b

 second radio transmitter / receiver unit

13a

 radio transmitter

13b

 radio transmitter

14a

 radio receiver

14b

 radio receiver

15

 radio signal

16

 display unit

Claims (24)

Drive system ( 1 ) for a goal ( 2 ), with an electric drive ( 6 ) having a drive unit, by means of which the gate ( 2 ) between a closed position and an open position can be moved, and with a drive unit associated radio receiver ( 14a ), which is used to receive radio signals ( 15 ), characterized in that a hand-held transmitter ( 9 ) and the radio receiver ( 14a ) Are part of a bidirectional radio transmission path, whereby one of the hand-held transmitter ( 9 ) in the form of radio signals ( 15 ) sent command to operate the gate ( 2 ) is acknowledged without additional request by an acknowledgment signal in the form of further radio signals ( 15 ) via the bidirectional radio transmission path to the hand-held transmitter ( 9 ) and displayed there. Drive system according to claim 1, characterized in that the radio receiver ( 14a ) Component of a first radio transmitter / receiver unit ( 12a ), and that in the transmitter ( 9 ) a second radio transceiver unit ( 12b ), the radio transmitter / receiver units ( 12a . 12b ) form the bidirectional radio transmission link. Drive system according to one of claims 1 or 2, characterized in that in one of the hand-held transmitter ( 9 ) emitted radio signal, a code is included, which with codes in a the radio receiver ( 14a ) are compared, the code of the remote control transmitter ( 9 ) is recognized as valid if it matches one of the stored codes. Drive system according to claim 3, characterized in that this several hand-held transmitter ( 9 ) assigned. Drive system according to Claim 4, characterized in that each hand-held transmitter ( 9 ) has an individual code, whereby the codes of the hand transmitter ( 9 ) are stored in the memory unit. Drive system according to one of claims 3 to 5, characterized in that an acknowledgment signal only to a command of the remote control ( 9 ) is generated if the code of the remote control ( 9 ) is recognized as valid. Drive system according to claim 6, characterized in that the acknowledgment signal is generated immediately as soon as the code of the remote control transmitter ( 9 ) is recognized as valid. Drive system according to one of claims 4 or 5, characterized in that the acknowledgment signal the code of the remote control transmitter ( 9 ) and in the transmitter ( 9 ) the acknowledgment signal is only displayed if in the hand-held transmitter ( 9 ) whose code is recognized in the acknowledgment signal. Drive system according to claim 4, characterized in that the acknowledgment signal to the radio receiver ( 14a ) and that in the transmitter ( 9 ) the acknowledgment signal is only displayed if this code is in the hand-held transmitter ( 9 ) is recognized. Drive system according to one of Claims 1 to 9, characterized in that the hand-held transmitter ( 9 ) has an optical display by means of which the acknowledgment signal is displayed. Drive system according to one of claims 1 to 9, characterized in that in the transmitter ( 9 ) an acoustic signal for displaying the acknowledgment signal is generated. Drive system according to one of Claims 1 to 9, characterized in that the hand-held transmitter ( 9 ) vibrates to indicate the acknowledgment signal. Drive system according to one of claims 1 to 6, characterized in that the radio receiver ( 14a ) a control unit ( 8th ) and forms a stationary unit with this. Drive system according to claim 13, characterized in that the storage unit is integrated in the control unit. Drive system according to one of claims 1 to 14, characterized in that the electric drive ( 6 ) on a carriage ( 5 ), which is attached to the gate ( 2 ) and to close and open the gate ( 2 ) on a guide rail ( 3 ) is movable. Drive system according to claim 15, characterized in that the control unit ( 8th ) the movement of the carriage ( 5 ) depending on the radio receiver ( 14a ) registered radio signals ( 15 ) controls. Drive system according to one of Claims 1 to 16, characterized in that the or each hand-held transmitter ( 9 ) has an actuating element, by the actuation of which a command in the form of radio signals is emitted, and that, if in the hand-held transmitter ( 9 ) no acknowledgment signal is received on this command, the transmission of the command is automatically repeated. Drive system according to Claim 17, characterized in that the transmission of the command is repeated until the acknowledgment signal in the hand-held transmitter ( 9 ) Will be received. Drive system according to one of claims 17 or 18, characterized in that a limited number of repetitions is provided. Drive system according to one of claims 17 to 19, characterized in that the repetitions take place at predetermined time intervals. Multiple arrangement of drive systems according to one of claims 1 to 19, characterized in that the individual drive systems ( 1 . 1a . 1b . 1c ) and their assigned handheld transmitter ( 9 ) each have a radio transmitter / receiver units ( 12a . 12b ), these radio transmitter / receiver units ( 12a . 12b ) Network nodes of a network such that one of a radio transceiver unit ( 12a . 12b ) transmitted by a second radio transmitter / receiver unit ( 12a . 12b ) is received by the latter automatically to a third radio transmitter / receiver unit ( 12a . 12b ) is sent on. Multiple arrangement according to claim 21, characterized in that a retransmission of a radio signal only from a permanently supplied with power radio transmitter / receiver unit ( 12a ) he follows. Multiple arrangement according to one of Claims 21 or 22, characterized in that the signal transmitted by the radio transmission / reception unit ( 12a . 12b ) emitted radio signal contains a count, wherein in the radio signal receiving further radio transmitting / receiving unit ( 12a . 12b ) the counter reading is read, then increased and is written to it as a new count in the radio signal before it from the other radio transmitter / receiver unit ( 12a . 12b ) and that retransmission of the radio signal from the further radio transmitter / receiver unit ( 12a . 12b ) takes place only if the reading read out is below a limit value. Multiple arrangement according to one of claims 21 to 23, characterized in that the Radio signal from a command of a remote control ( 9 ) or is formed by an acknowledgment signal.

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