Chapter 6
Digital I/O
X Series User Manual
6-12
ni.com
Using an Analog Source
When yo
u
u
se an analog trigger so
u
rce, the acq
u
isition stops on the first
rising edge of the Analog Comparison Event signal.
Routing DI Reference Trigger Signal to an Output
Terminal
Yo
u
can ro
u
te DI Reference Trigger o
u
t to any PFI <0..15>, RTSI <0..7>,
PXI_Trig <0..7>, or PXIe-DSTARC terminal. All PFI terminals are
config
u
red as inp
u
ts by defa
u
lt.
DI Pause Trigger Signal
Yo
u
can
u
se the DI Pa
u
se Trigger (di/Pa
u
seTrigger) signal to pa
u
se and
res
u
me a meas
u
rement acq
u
isition. The internal sample clock pa
u
ses while
the external trigger signal is active and res
u
mes when the signal is inactive.
Yo
u
can program the active level of the pa
u
se trigger to be high or low, as
shown in Fig
u
re 6-6. In the fig
u
re, T represents the period, and A represents
the
u
nknown time between the clock p
u
lse and the posttrigger.
Figure 6-6.
Halt (Internal Clock) and Free Running (External Clock)
DI
Sa
mple Clock
DI P
aus
e Trigger
T
A
DI Extern
a
l
Sa
mple Clock
DI P
aus
e Trigger
H
a
lt. U
s
ed on Intern
a
l Clock
Free R
u
nning. U
s
ed on Extern
a
l Clock
T – A
DI
Sa
mple Clock
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