Sorry for the late reply. No time to get my gear set up till now.
I tried both devices the DC focuser controller (see picture in Damien's post):
- works fine when connected to ekos., however even without a motor attached it keeps saying that it moved outward by x steps even though the motor doesn't react because not attached.
- the other model I have, the DC2 focuser controller and also the original problemmaker, seems to connect normally to ekos (green lights allover) but it does not pass anything to the motor when attached (at least the motor doesn't react). It also says " focusing outward/inward by x steps" even though the motor doesn't react.

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