Is this a multi-port "patching" splitter that allows each downstream port to have a different block of Null Startcode slots sent to it? For example, port 1 could be configured to take 100 slots of data starting from input slot 251, and it will retransmit it starting at slot 1?
The standard PIDs generally assume that universes are an inseparable block of data, so there aren't PIDs defined to slice universes in to multiple segments. RDMnet and E1.37 have the concept of a "Composite Universe", but managing composite universes is outside the scope of the standard.
It may be best to implement this with Manufacturer-specific PIDs.
I assume there will be other devices attached to the downstream ports? Will those devices only use NSC DMX, or will they also support RDM?
I would not recommend using Start Address for this, because some controllers will not allow you to patch fixtures on top of each other.
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