Hi,
I am not aware of any modbus real time code available, unless this modbus driver you are refering to has been written with LabVIEW Real Time it will not work.
I do not know what is ModbusView, but if it is a dll written to run on a PC it will not work on the FP-2010.
I hope it helps
Best Regards
Andre Oliveira
Applications Engineer
National Instruments