User manual

Chapter 3 Software Overview

Simple Analog Output Application

Figure 3-13 illustrates the basic series of calls for a simple analog output

application.

Figure 3-13. Simple Analog Output Application

The call to

AO_Configure

in Figure 3-13 must be made only if you have

changed the jumper settings of an MIO, AT-AO-6/10, or Lab-PC+ device.

Youalsomightcall

AO_Configure

to enable external updating of the

voltage. When you select external update mode, voltages written to the

device are not output until you apply a pulse to pin 48 (EXTUPDATE) on

the AT-AO-6/10, to pin 39 (EXTUPDATE) on the Lab and 1200 analog

output devices, or to the selected pin on an E Series device or 671X device.

You can simultaneously change the voltages at all the analog output

channels. The final steps in Figure 3-13 form a simple loop. New voltages

are output until the data ends.

Analog Output with Software Update Application

Another application option is to enable later software updates. Like the

external update mode, voltages written to the device are not immediately

output. Instead, the device does not output the voltages until you call

AO_Update

. In later software update mode, the device changes voltages

simultaneously at all the channels. Figure 3-14 illustrates a modified

version of the flowchart in Figure 3-13.

Ye s

Done outputting data?

AO_VWrite

Account for any changes in the

jumper settings. Enable

external update pulses?

Output voltage to board.

AO_Configure