The present invention provides a method of transferring data from a primary data converter (5) to at least one secondary data converter (5) , comprising the steps of : transferring (6) the data from the primary data converter to at least one mobile communication unit (8) , which at least one mobile communication unit comprises a user interface for the interaction of the at least one mobile communication unit with a user, and transferring the data from the at least one mobile communication unit to the at least one secondary data converter. The at least one mobile communication unit is switched such that a communication path between the primary and the at least one secondary data converter is created that is transparent to the user. The invention further provides control software for the mobile communication unit as well as a primary and a secondary data converter.
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