px4 and camera trigger

hi folks, 

need some help pls, i am totally frustrated, because i am not able to get the trigger function from px4 working.

my envirement :

original 3dr px 4 - current firmware 
camera sony nex 7
shutter gentLED-shutterPLUS ( 039 ) for sony nex 7
shutter output is aux4 ( channel 12 )

my 5v beck goes intou RC8 ( motor 8 )

if i try "trigger camera now" on "flight data page" nothing happend
i have set ch. 7 also to camera trigger.

rc12_funktion is set to 1, RCPassThrough

but nothing happend...

any suggetions ?

thank you !

regards
sascha

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