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Chapter 2 Function Reference — DAQ_to_Disk
NI-DAQ FRM for PC Compatibles 2-142
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National Instruments Corporation
DAQ_to_Disk
Format
status = DAQ_to_Disk (deviceNumber, chan, gain, filename, count, sampleRate, concat)
Purpose
Performs a synchronous, single-channel DAQ operation and saves the acquired data in a disk
file.
DAQ_to_Disk does not return until NI-DAQ has acquired and saved all the data or an
acquisition error has occurred.
Parameters
Input
Parameter Discussion
chan is the analog input channel number. If you are using SCXI, you must use the appropriate
analog input channel on the DAQ device that corresponds to the SCXI channel you want.
Select the SCXI channel using
SCXI_Single_Chan_Setup
before calling this function. Refer to the NI-DAQ User Manual for PC Compatibles for more
information on SCXI channel assignments.
Range: See Table B-1 in Appendix B, Analog Input Channel, Gain Settings, and
Voltage Calculation.
gain is the gain setting to be used for that channel. This gain setting applies only to the DAQ
device; if SCXI is used, you must establish any gain at the SCXI module either by setting
jumpers on the module or by calling
SCXI_Set_Gain. Refer to Appendix B, Analog Input
Channel, Gain Settings, and Voltage Calculation, for valid gain settings. If you use invalid
gain settings, NI-DAQ returns an error. NI-DAQ ignores gain for 516 and LPM devices and
the DAQCard-500/700.
Name Type Description
deviceNumber i16 assigned by configuration utility
chan i16 analog input channel number
gain i16 gain setting
filename STR name of data file to be created
count u32 number of samples to be acquired
sampleRate f64 rate in units of pts/s
concat i16 enables concatenation to an existing file