Response and RDM

Hello! I have a response gateway and I can’t get the RDM to work on port 4.

All other ports are ok, and I can get RDM out thru my Swisson rdm spliter that’s connected to port 4 if I use my DMXcat.

They are new and I can’t remember ever geting RDM on that port. Any tips or do I have to send it back?

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