Serial Communication with rs232/485 and rj45
You are missing something major.  You CANNOT connect a serial connection to an ethernet port and get anything useful out of it.

You will need an adapter from RJ45 to an RS232 conector (usually Sub D9) or to an RS485 connector (Not sure what this looks like.)  You will then need the appropriate interface on your PC - that would be a serial port for the RS232, or a special interface for the RS485.  Both of these can be had as external units that connect to your PC via USB.

You will then need a VI for Labview that can use the adapter.  RS232 should be standard, I don't know about RS485.  You can probably purchase an adapter from National that will include the correct VI and or drivers.

Both manuals include information on how to wire the RJ45 to a serial cable.  You will have to either build them yourself or try to order them from the equipment manufacturer.