Thank you Carolin.

So I must buy the Profilux Plus II controller, SMS-module and the RS232 cable from GHL. I was considering buying them from Aquapro2000 (www.aquapro2000.de) but they don't seem to have that cable. I was counting the number of pins in that cable (from the photos of the rear of the controller and it seems that there are just 9 pins like in an ordinary RS232 cable, are you sure that the RS232 cable from GHL is different from an ordinary one?

regards