Chapter 7
Counters
©
National Instruments
7-47
X Series User Manual
Counter
n
Internal Output and Counter
n
TC Signals
The Co
u
nter
n
Internal O
u
tp
u
t signal changes in response to Co
u
nter
n
TC.
The two software-selectable o
u
tp
u
t options are p
u
lse o
u
tp
u
t on TC and
toggle o
u
tp
u
t on TC. The o
u
tp
u
t polarity is software-selectable for both
options.
With p
u
lse or p
u
lse train generation tasks, the co
u
nter drives the p
u
lse(s) on
the Co
u
nter
n
Internal O
u
tp
u
t signal. The Co
u
nter
n
Internal O
u
tp
u
t signal
can be internally ro
u
ted to be a co
u
nter/timer inp
u
t or an “external” so
u
rce
for AI, AO, DI, or DO timing signals.
Routing Counter
n
Internal Output to an Output
Terminal
Yo
u
can ro
u
te Co
u
nter
n
Internal O
u
tp
u
t to any PFI <0..15>, RTSI <0..7>,
or PXIe-DSTARC terminal. All PFIs are set to high-impedance at start
u
p.
Frequency Output Signal
The Freq
u
ency O
u
tp
u
t (FREQ OUT) signal is the o
u
tp
u
t of the freq
u
ency
o
u
tp
u
t generator.
Routing Frequency Output to a Terminal
Yo
u
can ro
u
te Freq
u
ency O
u
tp
u
t to any PFI <0..15> or PXIe-DSTARC
terminal. All PFIs are set to high-impedance at start
u
p. The FREQ OUT
signal also can be ro
u
ted to DO Sample Clock and DI Sample Clock.
Default Counter/Timer Pinouts
By defa
u
lt, NI-DAQmx ro
u
tes the co
u
nter/timer inp
u
ts and o
u
tp
u
ts to the
PFI pins.
Refer to Table 7-9 for the defa
u
lt NI-DAQmx co
u
nter/timer o
u
tp
u
ts for
PCI Express, PXI Express, and USB Mass Termination devices. Refer to
Table 7-10 for the defa
u
lt NI-DAQmx co
u
nter/timer o
u
tp
u
ts for USB
Screw Terminal devices.
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