Справочник Пользователя для National Instruments Welding System 321645c-01

Chapter 2

Function Reference — AO_Change_Parameter

©

 National Instruments Corporation

2-27

NI-DAQ FRM for PC Compatibles

Selects a specific parameter setting for the analog output section of the device or an analog 
output channel. You can select parameters related to analog output not listed here through the 

AO_Configure

 function.

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

 (Visual Basic for Windows programmers should 

refer to the Programming Language Considerations in Chapter 1, Using the NI-DAQ 
Functions, for more information.)

•

Pascal programmers—

NIDAQCNS.PAS

Legal values for channel depend on the type of device you are using; analog output channels 
are labeled 0 through n–1, where n is the number of analog output channels on your device. 
You can set channel to –1 to indicate that you want the same parameter selection for all 
channels. You must set channel to –1 to change a parameter you cannot change on per 
channel basis.

i16

assigned by configuration utility

i16

number of channel you want to configure; you can 
use –1 to indicate all channels

u32

identification of the parameter you want to change

u32

new value for the parameter specified by 
paramID