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Chapter 2 Function Reference — AI_Setup
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National Instruments Corporation 2-15 NI-DAQ FRM for PC Compatibles
AI_Setup
Format
status = AI_Setup (deviceNumber, chan, gain)
Purpose
Selects an analog input channel and gain setting for externally pulsed conversion operations.
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. To
select the SCXI channel, use
SCXI_Single_Chan_Setup before calling 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: See Table B-1 in Appendix B, Analog Input Channel, Gain Settings, and
Voltage Calculation.
gain is the gain setting to be used for the specified channel. gain applies only to the DAQ
device; if you are using SCXI, establish any gain you want on the SCXI module by setting
jumpers on the module (if any) 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 an
invalid gain, NI-DAQ returns an error. If you call
AI_Setup for the 516 and LPM devices or
DAQCard-500/700, NI-DAQ ignores the gain.
Note
NI-DAQ does not distinguish between the low-gain and high-gain versions of the
AT-MIO-16. If you enter a gain of 10 and you have a device with gains of 1, 2, 4,
and 8, NI-DAQ uses a gain of 2 and returns no error.
Name Type Description
deviceNumber i16 assigned by configuration utility
chan i16 analog input channel number
gain i16 gain setting to be used