If I'm understanding what you are asking, you could just use a CNTBLOCK with the internal power jumper cut. That would isolate power between the two sides but still let cresnet data pass between the two sides.
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I will be updating an ancient system with a PAC2 and CLX dimmers and CNX-BXX keypads to Crestron Home in a few weeks.
There's a load of the field Cresnet wires landed right on the PAC2 on its many Phoenix connectors. I'm wondering if anyone has explored a way of isolating the Y and Z connections from the internal processor so it can be repurposed as a place to land the existing wiring, and provide power as it currently does. I'm going to try and look a PAC2 to see what's inside....maybe all those connectors are on a PCB and there's just a ribbon to the processor board and I remove the ribbon? Then we'd take a Cresnet wire Y, Z, G only from the CP4R to one of the connectors.
TIA
OP