Opening the safe
The safe is opened by turning the knob to the first key, pressing the knob, turning the knob to the second key, pressing the knob, and so on. Once all the keys have been entered, the opening wheel has to be turned in order to activate the opening coil.
Only the 5 last entered keys are used to check the opening sequence. In case of an erroneus sequence, the whole sequence is displayed and one has to wait for the end of the display before entering a new sequence.
The key values are displayed in binary on the LED array on the safe's front panel.
The test sequence 1 - 2 - 3 - 4 - 5 allows to test the functionality. The safe will not open but a display on the LED array shows that the sequence has been entered properly.