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Chapter 2 Function Reference — AO_Configure
NI-DAQ FRM for PC Compatibles 2-40
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National Instruments Corporation
If you make a reference voltage connection, you must assign refVoltage the value of the
external reference voltage in a call to
AO_Configure for the AO_VWrite and AO_VScale
functions to operate properly. For devices that have no external reference pin, the output range
is determined by outputPolarity, and NI-DAQ ignores this parameter.
updateMode indicates whether an analog output channel is updated when written to:
0: Updated when written to (default setting).
1: Not updated when written to, but updated later after a call to
AO_Update
(later internal update mode).
2: Not updated when written to, but updated later upon application of an active low
pulse. You should apply this pulse to the following:
• OUT2 pin for an MIO-16/16D device
• EXTDACUPDATE pin for an MIO-F/16 device
• EXTUPDATE pin for the AT-AO-6/10 and Lab and 1200 Series analog
output devices (later external update mode)
• PFI5 pin for the E Series devices. To alter the pin and polarity selections
you make with this function, for an E Series device, you can call
Select_Signal with signal = ND_OUT_UPDATE after you call
AO_Configure.
Note This mode is not valid for the VXI-AO-48XDC.
Using This Function
AO_Configure stores information about the analog output channel on the specified device
in the configuration table for the analog channel. For the AT-AO-6/10, the outputPolarity
and updateMode information is stored for channel pairs. For example, analog output
channels 0 and 1 are grouped in a channel pair, and a call to
AO_Configure for channel 0
record the outputPolarity and updateMode for both channels 0 and 1. Likewise, a call to
AO_Configure for channel 1 records the outputPolarity and updateMode for both
channels 0 and 1. The AT-AO-6/10 channel pairs are as follows:
AT-AO-6/10 channel pairs:
• Channels 0 and 1.
• Channels 2 and 3.
• Channels 4 and 5.
• Channels 6 and 7 (AT-AO-10 only).
• Channels 8 and 9 (AT-AO-10 only).