If you are programming using VISA, the following link takes you to some examples of waiting until the instrument has data available. The example link also includes other examples of synchronizing your application with your instrument. <br> <a href=http://sine.ni.com/apps/we/niepd_web_display.DISPLAY_EPD4?p_guid=C99424CC48EC1273E034080020E74861&p_node=dz59204_us&p_submitted=N&p_rank=&p_answer=&p_source=External>Using Instrument Status Registers with Service Requests and Polling<a>
