Just based on my own limited experiments, the 3500 does decipher and respond to Datalink 86 (MCL2), at least to an extent.  Penta status updates seemed to provide 3500 screen updates. and I think I recall an On/Off trigger. At this point I stopped looking at it.  Also of note, there is no "5V" injection option here, as there does not appear to be an "active" pin or similar that one sees on a proper Powerlink speaker. So to have any chance to wake up the speaker via ML/MCL, one would need to address it appropriately- for example using a properly formatted MCL2 command. In my limited testing, I seem to recall that I could send an MCL2 signal to turn it on and off, and update the source on the screen.  I don't recall if I could send MCL2 that would manipulate the volume.  I spent a total of 10 minutes on it, so my memory may be a bit hazy. All that being said, I do not know which 3500 firmware version- if any- is coded to respond to a signal to control ALL of it's features (On/Off, VolLvl, Mute). The 3500 I have at the shop is on FW 1.0, so it may fall into the "not yet implemented" category and not indicative of the later variants.