Connecting Graupner GR-12L with SUMD


I want to connect my Graupner GR-12L to the Pixhawk 2.
I connect the channel 6 to the SPKT/DSM Port. (
But it doesn`t work at all. The radio I change it to SUMD.
Does Pixhawk work with SUMD?
What have I done wrong? Should I change something in the settings of the Pixhawk?

Thanks for your help.

Not so difficult to find…

Benoit did it for Plane.