An anchoring device for fixing a structural cable to a building element, the cable comprising a plurality of strands each comprising wires which are themselves enclosed together in a protective sheath, each of the protective sheaths being interrupted at a terminal edge such that the strands have each an exposed end section. One embodiment of the method includes calculating a first checksum from first bits representative of instructions in a block of a program concurrently with executing the instructions. The distance from the light-transmitting section 1 to the imaging section 3 is equal to the first focal length f1 and the distance from the imaging area of the image sensor 2 to the imaging section 3 is equal to the second focal length f2. The voltage response module is to output a first signal in response to an overvoltage, and output a second signal in response to a constant voltage.