National Instruments 321645c-01

National Instruments Corporation 2-1 NI-DAQ FRM for PC Compatibles

Chapter

Function Reference

This chapter contains a detailed explanation of each NI-DAQ function. The functions are

arranged alphabetically.

AI_Change_Parameter

Format

status = AI_Change_Parameter (deviceNumber, channel, paramID, paramValue)

Purpose

Selects a specific parameter for the analog input section of the device or an analog input

channel. You can select parameters related to analog input not listed here through the

AI_Configure function.

Input

Parameter Discussion

Legal ranges for paramID and paramValue are given in terms of constants defined in a

header file. The header file you should use depends on the language you are using:

• C programmers—NIDAQCNS.H (DATAACQ.H for LabWindows/CVI)

• BASIC programmers—NIDAQCNS.INC

Note Visual Basic for Windows programmers should refer to the Visual Basic for

Windows topic for more information.

Name Type Description

deviceNumber i16 assigned by configuration utility

channel i16 number of channel you want to configure; use –1

to indicate all channels

paramID u32 identification of the parameter you want to change

paramValue u32 new value for the parameter specified by

paramID