Through the Programming Unit FI750/PU, the physical loop address of detectors Series FI750 and modules Series FI700 is set. Furthermore, in connection with conventional detectors Series FC650, the thermal class of a Thermal Detector FC650/T or the function of the status LED can be set. In addition, significant parameters of a detector Series FI750 or module Series FI700 or detector Series FC650, such as the device type, the default analog value, the production date or the level of contamination of an optical smoke detector, can be read out and indicated on the display of the unit. The programming unit has an integrated detector base for the accommodation of an automatic detector as well as the cables for the connection of a manual call point, module or base sounder.