User manual

Chapter 3 Software Overview

7. Go to the code window, pull down on the Object combo box, and

select GeneralDAQEvent1. The only Proc for this control object is

Fire. Within the subroutine, enter the following code:

If (DoneFlag% <> 1) Then

Text1.Text = Str$(Scans&)+"scans have been

acquired."

Else

Text1.Text = "Acquisition is complete!"

er% = DAQ_Clear(1)

End If

8. Make sure that you stop any ongoing acquisition when you stop the

program. To do so, call the

DAQ_Clear

function before the

End

statement in the subroutine

Command2_Click(_)

. Place another

button on your form and label it

Exit

. The subroutine should have

code as follows:

er% = DAQ_Clear(1)

End

9. Run the program. Because you are not going to display the data onto a

graph, it does not matter what the data is; however, when you click on

the Click Me! button, the text box should update its contents every

second. After all the scans are acquired, you should see the text box

displayacompletionmessage.Ifyourunintoerrors,refertothe

NI-DAQ Function Reference Online Help file for guidance.

10. Click on the Exit buttontostoptheprogram.

Analog Input Function Group

The analog input function group contains two sets of functions—the

one-shot analog input functions, which perform single A/D conversions,

and the data acquisition functions, which perform multiple clocked,

buffered A/D functions. Within the analog input functions, single-channel

analog input (

) functions perform single A/D conversions on one

channel. Within the data acquisition functions, there are high-level,

low-level, and low-level double buffered functions.

If you are using SCXI analog input modules (other than the SCXI-1200)

you must use the SCXI functions first to program the SCXI hardware.

Then you can use these functions to acquire the data using your DAQ

device or SCXI-1200 module.