A closure or solar protection installation, in particular of the rolling shutter type, including: - a rolling shutter apron comprising a plurality of shutter slats, each shutter slat having two edges (60, 62) and being capable of pivoting about a pivoting axis extending laterally from one edge (60, 62) of the shutter slat to the opposite edge (60, 62) of the shutter slat, each slat being driven so as to pivot by means of a pivot guide when the latter turns about its own axis, each pivot guide being positioned on the same side of the apron; - a pair of rods connecting the projections of the pivot guides and movable in translational motion along an axis perpendicular to the pivoting axis, the projections and the pair of rods cooperating so as to cause the pivot guides to turn about their own axis; - a winding shaft for winding the apron the rotation of which is capable of causing the raising or lowering of the apron between a high position in which the apron is wound around the shaft and a low position in which the apron is unwound; and - a flange and an end panel placed on the same side of the apron as the pivot guides, serving to position the shaft laterally, characterised in that: - the flange has a track in a plane perpendicular to the shaft, and - the installation in addition includes: - a slat detecting member for indicating the absence of slats comprising a first portion that is secured to the shaft and a second portion resiliently biased to move away from the shaft, the second portion being pressed against the shaft by the slats as long the apron is not in the low position, the second portion comprising a lug at one end, the lug being capable of following the track when the shaft is driven in rotation beyond the low position of the apron; - a disc having an axis concentric with the winding shaft, the disc being driven in rotation by the lug when the lug follows the track; and - motion conversion means for converting the rotational movement of the disc into a translational movement thereby allowing the two rods to be driven in translation by the disc when the disc is in motion. - a rolling shutter apron comprising a plurality of shutter slats, each shutter slat having two edges (60, 62) and being capable of pivoting about a pivoting axis extending laterally from one edge (60, 62) of the shutter slat to the opposite edge (60, 62) of the shutter slat, each slat being driven so as to pivot by means of a pivot guide when the latter turns about its own axis, each pivot guide being positioned on the same side of the apron; - a pair of rods connecting the projections of the pivot guides and movable in translational motion along an axis perpendicular to the pivoting axis, the projections and the pair of rods cooperating so as to cause the pivot guides to turn about their own axis; - a winding shaft for winding the apron the rotation of which is capable of causing the raising or lowering of the apron between a high position in which the apron is wound around the shaft and a low position in which the apron is unwound; and - a flange and an end panel placed on the same side of the apron as the pivot guides, serving to position the shaft laterally, - the flange has a track in a plane perpendicular to the shaft, and - the installation in addition includes: - a slat detecting member for indicating the absence of slats comprising a first portion that is secured to the shaft and a second portion resiliently biased to move away from the shaft, the second portion being pressed against the shaft by the slats as long the apron is not in the low position, the second portion comprising a lug at one end, the lug being capable of following the track when the shaft is driven in rotation beyond the low position of the apron; - a disc having an axis concentric with the winding shaft, the disc being driven in rotation by the lug when the lug follows the track; and - motion conversion means for converting the rotational movement of the disc into a translational movement thereby allowing the two rods to be driven in translation by the disc when the disc is in motion. - a slat detecting member for indicating the absence of slats comprising a first portion that is secured to the shaft and a second portion resiliently biased to move away from the shaft, the second portion being pressed against the shaft by the slats as long the apron is not in the low position, the second portion comprising a lug at one end, the lug being capable of following the track when the shaft is driven in rotation beyond the low position of the apron; - a disc having an axis concentric with the winding shaft, the disc being driven in rotation by the lug when the lug follows the track; and - motion conversion means for converting the rotational movement of the disc into a translational movement thereby allowing the two rods to be driven in translation by the disc when the disc is in motion.