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Chapter 2 Function Reference — DAQ_Start
NI-DAQ FRM for PC Compatibles 2-136
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National Instruments Corporation
DAQ_Start
Format
status = DAQ_Start (deviceNumber, chan, gain, buffer, count, timebase, sampInterval)
Purpose
Initiates an asynchronous, single-channel DAQ operation and stores its input in an array.
Input
Output
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 you are using SCXI, you must establish any gain you want 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 the 516 and LPM
devices and DAQCard-500/700.
Name Type Description
deviceNumber i16 assigned by configuration utility
chan i16 analog input channel number
gain i16 gain setting
count u32 number of samples to be acquired
timebase i16 timebase value
sampInterval u16 sample interval
Name Type Description
buffer [i16] used to hold acquired readings