Chapter 5
Analog Output
©
National Instruments
5-5
X Series User Manual
size. The advantage of
u
sing FIFO regeneration is that it does
not req
u
ire comm
u
nication with the main host memory once
the operation is started, thereby preventing any problems that
may occ
u
r d
u
e to excessive b
u
s traffic. Use the NI-DAQmx
AO channel property, UseOnlyOnBoardMemory to enable or
disable FIFO regeneration.
•
With non-regeneration, old data is not repeated. New data
m
u
st be contin
u
ally written to the b
u
ffer. If the program does
not write new data to the b
u
ffer at a fast eno
u
gh rate to keep
u
p with the generation, the b
u
ffer
u
nderflows and ca
u
ses an
error.
Analog Output Triggering
Analog o
u
tp
u
t s
u
pports two different triggering actions:
•
Start trigger
•
Pa
u
se trigger
An analog or digital trigger can initiate these actions. All X Series devices
s
u
pport digital triggering, b
u
t some do not s
u
pport analog triggering. To
find yo
u
r device’s triggering options, refer to the specifications doc
u
ment
for yo
u
r device. Refer to the
AO Start Trigger Signal
and
AO Pause Trigger
Signal
sections for more information abo
u
t these triggering actions.
Connecting Analog Output Signals
AO <0..3> are the voltage o
u
tp
u
t signals for analog o
u
tp
u
t channels 0, 1, 2,
and 3. AO GND is the gro
u
nd reference for AO <0..3>.
Fig
u
re 5-2 shows how to make analog o
u
tp
u
t connections to the device.
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