You can set the poll rate to zero or to a subsecond value from 0.1 to 0.9. For example, you could set the poll rate to 0.5. Setting the poll rate to zero or a subsecond value disables overruns. Enter a zero poll rate also forces the driver to run at its maximum rate. In general, you should set the poll rate to less than 1, if it is more important to run the driver at a fast speed than to detect overruns. If you plan to use a poll rate less than 1, make sure your process hardware supports subsecond values.
