A method of establishing a wireless operating communication between the extracorporeal blood treatment device and a medical accessory and extracorporeal blood treatment device configured for implementing the method are provided； the method comprises the steps of establishing a wireless auxiliary communication between the blood treatment device and the medical accessory, transferring configuration data using the wireless auxiliary communication and establishing the wireless operating communication between the blood treatment device and the medical accessory based on the configuration data. A maximum operating distance of the wireless auxiliary communication is shorter than a maximum operating distance of the wireless operating communication.
