Sunny,
For this type of application you will need to control the PXI-5600 and PXI-5610 as seperate modules, in addition to the PCI-5640R. To do this you will need the following APIs:
NI-5640R
NI-RFSA
NI-RFSG
NI-RFSA will install a sub-API called NI-Tuner which can be used to control the 5600 as seperate module. For the 5610, you will use the Upconverter Only mode in NI-RFSG. There are several shipping examples for each of these cases which can be found as below:
<Your LabVIEW directory>\Examples\examples\instr\niTuner
<Your LabVIEW directory>\Examples\examples\instr\niRFSG
You can use these APIs in parallel with the NI-5640R instrument driver.
Hope that helps!
Chris Behnke
Sr. RF Engineer
High Frequency Measurements