If you are a technician: Go to the official source. Register for the Elkron/Urmet B2B portal. The "Manuale Tecnico" there is often watermarked with your name—meaning they take their IP seriously.
: 5 canali programmabili per trasmissioni digitali multiprotocollo. Elkron Communicator St105nv Manuale Tecnico Pdf
Here is the problem. Elkron (part of the Urmet group) makes fantastic hardware but treats their technical manuals like state secrets. If you are a technician: Go to the official source
If you cannot access the online portal, email support@elkron.com with the following: email support@elkron.com with the following: