Nikon D5200 - External trig without memory card

Hi 
I want to use the command:
gphoto2 --wait-event-and-download

This is no problem with memory card. But I want a solution without a memory
card inside camera body.

I have tried to use the command:
gphoto2 --get-config capturetarget

The gphoto2 reply:
Current: Internal RAM

And in the camera, the settings: "Slot empty release lock - OK"

All settings seems to be OK. Can anyone see something that I have forgotten?
This works in Windows with http://digicamcontrol.com/.

/Mats



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