Chapter 6
Digital I/O
©
National Instruments
6-9
X Series User Manual
engine waits for another Start Trigger to begin another clock generation.
Fig
u
re 6-4 shows a retriggerable DI of fo
u
r samples.
Figure 6-4.
Retriggerable DI
Note
Waveform information from LabVIEW will not reflect the delay between triggers.
They will be treated as a contin
u
o
u
s acq
u
isition with constant t0 and dt information.
Reference triggers are not retriggerable.
Using a Digital Source
To
u
se DI Start Trigger with a digital so
u
rce, specify a so
u
rce and an edge.
The so
u
rce can be any of the following signals:
•
PFI <0..15>
•
RTSI <0..7>
•
Co
u
nter
n
Internal O
u
tp
u
t
•
PXI_STAR
•
PXIe-DSTAR<A,B>
•
Change Detection Event
•
AI Start Trigger (ai/StartTrigger)
•
AO Start Trigger (ao/StartTrigger)
•
DO Start Trigger (do/StartTrigger)
The so
u
rce also can be one of several other internal signals on yo
u
r DAQ
device. Refer to
Device Routing in MAX
in the
NI-DAQmx Help
or the
LabVIEW Help
for more information.
Yo
u
also can specify whether the meas
u
rement acq
u
isition begins on the
rising edge or falling edge of DI Start Trigger.
DI
S
t
a
rt Trigger
DI
Sa
mple Clock
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