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Chapter 2 Function Reference — Lab_ISCAN_to_Disk
NI-DAQ FRM for PC Compatibles 2-274
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National Instruments Corporation
Lab_ISCAN_to_Disk
Format
status = Lab_ISCAN_to_Disk (deviceNumber, numChans, gain, filename, count, sampleRate,
scanRate, concat)
Purpose
Performs a synchronous, multiple-channel scanned data acquisition operation and
simultaneously saves the acquired data in a disk file.
Lab_ISCAN_to_Disk does not return
until NI-DAQ has acquired and saved all the data or an acquisition error has occurred
(DAQCard-500/700 and 516, Lab and 1200 Series, and LPM devices only).
Parameters
Input
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
the NI-DAQ User Manual for PC Compatibles for more information on SCXI channel
assignments.
Range: 1 through 4 for the 516 and Lab and 1200 Series devices in differential mode.
1 through 8 for the DAQCard-500 (single-ended mode only).
Name Type Description
deviceNumber i16 assigned by configuration utility
numChans i16 number of channels to be scanned
gain i16 gain setting
filename STR name of the data file to be created
count u32 number of samples to be acquired
sampleRate f64 desired sample rate in units of pts/s
scanRate f64 desired scan rate in units of pts/s
concat i16 enables concatenation of data to an existing file