User manual

Chapter 3 Software Overview
NI-DAQ User Manual for PC Compatibles 3-22 ni.com
DAQ_Rate
Converts a data acquisition rate into the
timebase and sample-interval values
needed to produce the rate you want.
DAQ_Set_Clock
Sets the scan rate for a group of channels.
DAQ_Start
Initiates an asynchronous, single-channel
data acquisition operation and stores its
input in an array.
DAQ_StopTrigger_Config
Enables the pretrigger mode of data
acquisition and indicates the number of
data points to acquire after you apply the
stop trigger pulse at the appropriate
PFI pin.
DAQ_VScale
Converts the values of an array of acquired
binary data and the gain setting for that data
to actual input voltages measured.
Lab_ISCAN_Check
Checks if the current scan data acquisition
operation begun by the
Lab_ISCAN_Start
function is complete
and returns the status, the number of
samples acquired to that point, and the
scanning order of the channels in the data
array.
Lab_ISCAN_Start
Initiates a multiple-channel scanned data
acquisition operation and stores its input in
an array.
SCAN_Demux
Rearranges, or demultiplexes, data
acquiredbya
SCAN
operation into
row-major order (that is, each row of the
array holding the data corresponds to a
scanned channel) for easier access by
C applications.
SCAN_Demux
does not
need to be called by BASIC applications to
rearrange two-dimensional arrays because
these arrays are accessed in column-major
order.
SCAN_Sequence_Demux
Rearranges the data produced by a
multirate acquisition so that all the data