supply to the vibration sensor means 33 and therefore stop any signal produced by the latter alternatively the logic processing unit 34 may simply stop analyzing the signals present at its input acc or temporarily block the sending of a signal transmission command to the radio transmitter 35 or temporarily interrupt the power to the radio transmitter 35 by a means similar to the control switch 37 or by using the same control switch 37 to cut off the power to the vibration sensor means and to the radio transmitter once the sensor device has been configured its operation is such that when movements or vibrations exceed a predetermined safety threshold the sensor device transmits a safety signal that triggers a safety movement of the screen for example winding it up in the case of an awning supported by arms one way of carrying out the setting method according to the invention is described in detail below with reference to fig4 in the first step e 11 the sensor device is put in an setting mode this can be done in various ways for example if the sensor device has wireless signal receiving means a signal to enter the setting mode can be sent to it from a remote control with which it is paired alternatively the sensor device may have a special switch for putting it in the setting mode when activated also if the sensor device is of the type described above it is possible.