Those messages look like something specific to the eCUE's implementation and not something directly related to RDM. IIRC eCUE uses an ethernet to DMX gateway, so those messages may be related to the network communication side of things.
As Scott said, I would not expect a moving head to have sub-devices. It may or may not have sensors. Many of the Martin fixtures have sensors that are accessible via RDM, but I've not used a MAC 350 to can't tell you what to expect with it.
Can you change the DMX address and other features of the light remotely?
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