Hi Frank,
the IR input on the Lintronic box is a 3,5 mm jack connector at the back of the box called Input, ext. data input, infrared, RF,etc.
http://www.lintronic.dk/TableTopVersion-Technical-005.pdf
You need a 3,5 mm stereo jack, but you only need 2 pins: B= IR signal, C= Ground.
http://www.lintronic.dk/InfraRedReceivers.htm#1455
You connect IR signal to pin8 and ground to pin21 (SCART). That`s it.
Stefan