National Instruments Welding System 321645c-01 Manual De Usuario

Chapter 2

Function Reference — DAQ_Start

NI-DAQ FRM for PC Compatibles

2-136

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 National Instruments Corporation

Initiates an asynchronous, single-channel DAQ operation and stores its input in an array.

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, 

.

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, 

, 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.

i16

assigned by configuration utility

i16

analog input channel number

i16

gain setting

u32

number of samples to be acquired

i16

timebase value

u16

sample interval

[i16]

used to hold acquired readings