Maybe I'm wrong, but I don't think it can be done. LinxEnterprise uses FactoryTalk. The emulator is only OPC. The emulator is available to Linx, but not LinxEnterprise.
If you're using the 485 driver in enterprise (which you're doing if you're messing with the jumper settings), it's looking for a REAL 485 connection out of your computer, not a virtual connection.