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Why doesn't the RTI "speak" anymore after I installed the iMIV/MII?

You probably received a 'Second in Chain' Melbus cable but disconnected the RTI from the existing Melbus cable to put the iMIV/MII first in chain.

There is an easy fix: Just take the iMIV/MII out, connect the RTI the way it was before to the existing Melbus cable, take the Melbus cable you received from us, plug the right angled side into the free connector of the RTI and the other end into the "HU" labeled connector of the iMIV/MII.

The iMIV/MII is now second in chain and the RTI will be able to "speak" again.