User manual

Chapter 3 Software Overview

Waveform Generation Functions

Use the Waveform Generation (

WFM

) functions to perform buffered analog

output operations with the MIO devices, 671X devices, AT-AO-6/10

devices, and Lab and 1200 analog output devices.

Refer to the NI-DAQ Function Reference Online Help file to determine

which functions your device supports.

High-Level Waveform Generation Functions

The following high-level Waveform Generation functions accomplish with

a single call tasks that require several low-level calls to accomplish:

WFM_from_Disk

Assigns a disk file to one or more analog

output channels, selects the rate and the

number of times the data in the file is to be

generated, and starts the generation.

WFM_from_Disk

always waits for

completion before returning, unless you

call

Timeout_Config

WFM_Op

Assigns a waveform buffer to one or more

analog output channels, selects the rate and

the number of times the data in the buffer is

to be generated, and starts the generation. If

thenumberofbuffergenerationsisfinite,

WFM_Op

waits for completion before

returning, unless you call

Timeout_Config

Low-Level Waveform Generation Functions

Low-level Waveform Generation functions are for setting up, starting, and

controlling synchronous waveform generation operations:

WFM_Chan_Control

Temporarily halts or restarts waveform

generation for a single analog output

channel.

WFM_Check

Returns status information concerning a

waveform generation operation.

WFM_ClockRate

Sets an update rate and a delay rate for a

group of analog output channels.