The present invention relates to a connecting system for connecting a medical tubular line (18) to a medical fluid transfer system (2), with the tubular line (18) comprising a plug-in component (14) with a first fluid channel (15) and the fluid transfer system (2) comprising a coupling component (1) with a second fluid channel (9), and with the plug-in component (14) being able to engage in the coupling component (1) so as to establish a passageway for a medical fluid, which passageway connects the fluid channels (15 9) to one another. By disposing a first passive transponder (22) in the plug-in component (14) and a second passive transponder (13) in the coupling component (1) at a distance below a predefined threshold value relative to one another, communication of a read/write unit with both transponders (22 13) via a single antenna (23) is made possible when the plug-in component (14) is engaged in the coupling component (1) so that identification data for the identification of the tubular line and the fluid transfer system stored in the transponders can be read by a read/write unit via a single antenna.
