How can I generate variable frequency in different time with NI USB 6229?!

Hello,
  I have NI USB 6229, and I want to have VI which;
  in this VI I have to firstly generate a initial frequency togive it to a circuit, after that according to the results that I am reading from circuit I have to make some delay in the same frequency  which I generated before and again give it to circuit to see the results again.actually in other word it is some kind of feedback process.
I would be thankful if some one can help me to how to make this VI because still I do not have any idea to program it.
Sorry if I could not explain well because I am as beginner .
thanks

Hi worldviol
I think a great place to start would be for you to have a look at the examples included in LabVIEW (help >> Find Examples..)
Have a look under 'Hardware Input and Output' > 'DAQmx' and then 'Analog Input' and 'Analog Output' you will also probably find 'Synchronization' useful.
The next stage would be to pick the most appropriate design pattern, you should read the white-paper here on design patterns.
I think the producer consumer design pattern would be useful here as you would be reading and writing to the device at different rates.
Kind Regards
Chris | Applications Engineer NIUK

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