So, if I want to control both Slimline and LBII I will need to connect the one to Profilux (lets say the Slimline) and the other one (lets say the LBII) to Expansion Box. Correct?

Because if you see the reply from Vinny on my post with the subject "Can I dimm Slimline and Mitras 2 lightbar from the same Profilux"? he replies that I can if on the Profilux I have 2 different RS 232 ports available. This is also wrong if I get it right from your reply.

Expansion Box I is it compatible with this function?