No DMX out on Martin M-Play

I‘m using Onyx on a Windows 10 PC with a Martin M-Play as a Sidewing. The M-Play is detected in Onyx but I can get no DMX signals out of the M-Play!
Anyone any idea what‘s the problem?

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Does the problem still occur? What version of Onyx?

I ran out of time and so I choose the expensive workaround and bought an Obsidian NX DMX interface.