WDA,
You cannot reverse the scroll direction, but you can play with the History property for the chart. This property holds all of the data from the chart up to the number of points specified in the history length (a front panel only property that can be changed by right-clicking on the chart itself and selecting Chart History Length).
To create a History property node, right-click on the Waveform Chart on the block diagram and select Create>>Property Node. Then, right-click on the new property node and choose Properties>>History Data. You can read and write to this property node depending upon which mode it is in (right-click on the property node and select Change to Write/Change to Read to switch modes).
Randy Hoskin
Applications Engineer
National Instrume
nts
http://www.ni.com/ask
