Chapter 7 Counters
© National Instruments 7-47 X Series User Manual
Counter n Internal Output and Counter n TC Signals
The Counter n Internal Output signal changes in response to Counter n TC.
The two software-selectable output options are pulse output on TC and
toggle output on TC. The output polarity is software-selectable for both
options.
With pulse or pulse train generation tasks, the counter drives the pulse(s) on
the Counter n Internal Output signal. The Counter n Internal Output signal
can be internally routed to be a counter/timer input or an “external” source
for AI, AO, DI, or DO timing signals.
Routing Counter n Internal Output to an Output
Terminal
You can route Counter n Internal Output to any PFI <0..15>, RTSI <0..7>,
or PXIe-DSTARC terminal. All PFIs are set to high-impedance at startup.
Frequency Output Signal
The Frequency Output (FREQ OUT) signal is the output of the frequency
output generator.
Routing Frequency Output to a Terminal
You can route Frequency Output to any PFI <0..15> or PXIe-DSTARC
terminal. All PFIs are set to high-impedance at startup. The FREQ OUT
signal also can be routed to DO Sample Clock and DI Sample Clock.
Default Counter/Timer Pinouts
By default, NI-DAQmx routes the counter/timer inputs and outputs to the
PFI pins.
Refer to Table 7-9 for the default NI-DAQmx counter/timer outputs for
PCI Express, PXI Express, and USB Mass Termination devices. Refer to
Table 7-10 for the default NI-DAQmx counter/timer outputs for USB
Screw Terminal devices.
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