Your question is kind of vague. You don't mention the makes and models of the instruments or whether you are using a driver, code you wrote, or the Instrument I/O Assistant. You say you have a problem with communicating with the DSA but need to provide the exact nature of the problem. If you get an error when communicating, provide the error code that you get. You should do a search of http://www.ni.com/devzone/idnet/ to see if there is a driver available. Click the Browse link at the top to bring up the search page. Most of the drivers use VISA as the communication protocol so you should make sure you have that installed. Most of the drivers will also come with a high level example that demonstrates how to use some of the functions in the driver. Also on the page above there are links that explain what an instrument driver is, how to use one in LabVIEW, and an instrument control fundamentals tutorial.
p.s. You also posted to the wrong board. This board is for NI DSA products. You want to post forther questions to the Instrument Control board.
