networking, Universe 2, Ion Board, patching

We have an Ion Light Board hooked up by an Ethernet cable and it switches to DMX before it gets to the instruments.  We've only previously used universe 1 and I need to find out if I can use the 2nd universe after adding some more dimmer packs.  How do I find this out?  I tried re-patching 2/142 and the instrument doesn't have a universe choice.  How does the instrument (that only goes to 512) know to respond if its patched to a second universe?  My Ion is set up for 2 universes- I've checked the shell and the basic info about allowed output addresses (1-65536).  I have architecture lights using some of my channels.  I'm familiar with patching nomenclature.  any help is appreciated.

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