QTR-Quadtone RIP

Hi

I installed QTR and followed the user guide. I gave the IP number of may Airport Station since my 1430 is over the Airport Station (it prints perfectly up to now).
I opened a tiff greyscale file in PS CS3, selected the printer (which I see), used the options panel in the printer dialog box and hit "Print".

There is a window opening and I can see percentages going by. At the end I have the message "Printer is occupied" and it stops there. The 1430 never started.
Am I missing something?
Thanks