Eheim controller and Mitras

I have the profilux eheim controller and Mitras interface. Both need the rs232 connection on the profilux. I have connected the eheim controller to the profilux and the Mitras controller connected to the eheim controller (view/computer). The connection for the eheim is working properly but cannot control the Mitras.

Am I doing something wrong, any suggestions?

The Mitras lightbar needs the RS232 exclusive. It´s not possible to daisy chain it with the Eheim controller.

Can I add an additional RS232 interface to my profilux as a solution?

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Can I add an additional RS232 interface to my profilux as a solution?

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Yes, that´s possible.