Jack,
I would be very careful about assuming that all the controllers will "pass thru" the signals untouched. I know that on the Renard based controllers, the unused pins are either tied to ground or sometimes a single pin of a pair will be untouched, and others used.
For the DC controllers that RPM designs, I haven't checked to know if he passes pins 4 and 5 on...
It's important to note that on a 5-pin XLR connector, typically used in the theatre industry, pins 4 and 5 on the XLR is the secondary DMX channel. But on the RJ45s - there's no "reserved" pins.
Mark
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