Abstract: A device to receive coded light signals and to transmit modulated light signals in the direction of the incident signals, comprising an omnidirectional detection device composed of a plurality of radiation sensors, an optical device for reflecting the light signal in its own direction, a recognition and encoding circuit connected to the sensors and an optical modulator operable to prevent the reflection of the light signal, the modulator being controlled by the recognition and encoding circuit, the modulator comprising a shutter rotatable about the axis of the detection device, a member for driving the shutter controlled by the recognition and encoding circuit and a second circuit connected to the outputs of the sensors to determine which one of the sensors receives the incident beam, the second circuit delivering to the drive member a control signal for setting the initial angular position of the shutter.