Understand the RF programming tools and modes.

RF List Mode
RF list mode is an operating mode in which the hardware deterministically sequences through a predetermined set of RF configurations.
Driver Setup Options
The Driver Setup string is used with Initialize With Options to set the initial values for properties that are specific to NI-RFSA.
Specifying or Simulating a Device with NI-RFSA
You can simulate NI-RFSA device using NI-RFSA to develop, modify, and/or test an application without hardware. Using a simulated device to test an application eliminates the risk of hardware damage.
NI-RFSA Simulated Devices
You can simulate NI-RFSA device using NI-RFSA or Measurement & Automation Explorer (MAX) to develop, modify, and/or test an application without hardware.
Associating Hardware Modules in SystemDesigner
Before you can program your vector signal analyzer, you must create an association between the individual hardware modules to control them as a single RF device.
Using the NI-RFSA .NET Class Library
You can use the NI-RFSA .NET class library to initialize, configure, initiate, run, and close a session on your NI-RFSA device. The NI-RFSA .NET API is an IVI-compliant instrument driver that features a set of methods and properties that exercise the functionality of the NI-RFSA hardware.

NI-RFSA User Manual