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Chapter 2 Function Reference — Lab_ISCAN_Start
NI-DAQ FRM for PC Compatibles 2-270
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National Instruments Corporation
Lab_ISCAN_Start
Format
status = Lab_ISCAN_Start (deviceNumber, numChans, gain, buffer, count, sampTimebase,
sampInterval, scanInterval)
Purpose
Initiates a multiple-channel scanned data acquisition operation and stores its input in an array
(DAQCard-500/700 and 516, Lab and 1200 Series, and LPM devices only).
Parameters
Input
Output
Parameter Discussion
numChans is the number of channels to be scanned in a single scan sequence. The value
of this parameter also determines which channels NI-DAQ scans because these supported
devices have a fixed scanning order. The scanned channels range from numChans – 1 to
channel 0. If you are using SCXI modules with additional multiplexers, you must scan the
appropriate analog input channels on the DAQ device that corresponds to the SCXI channels
you want. You should select the SCXI scan list using
SCXI_SCAN_Setup before you call this
function. Refer to Chapter 12, SCXI Hardware, in the DAQ Hardware Overview Guide and
Name Type Description
deviceNumber i16 assigned by configuration utility
numChans i16 number of channels to be scanned
gain i16 gain setting
count u32 total number of samples to be acquired
sampTimebase i16 timebase, or resolution, used for the
sample-interval counter
sampInterval u16 length of the sample interval
scanInterval u16 length of the scan interval
Name Type Description
buffer [i16] results of the scanned data acquisition