© National Instruments
|
5-37
Using an Internal Source
To use Counter
n
Sample Clock with an internal source, specify the signal source and the
polarity of the signal. The source can be any of the following signals:
•
DI Sample Clock
•
DO Sample Clock
•
AI Sample Clock (ai/SampleClock, te0/SampleClock, te1/SampleClock)
•
AI Convert Clock
•
AO Sample Clock
•
DI Change Detection output
Several other internal signals can be routed to Counter
n
Sample Clock through internal routes.
Refer to
Device Routing in MAX
in the
NI-DAQmx Help
or the
LabVIEW Help
for more
information.
Using an External Source
You can route any of the following signals as Counter
n
Sample Clock:
•
Any PFI terminal
•
Analog Comparison Event
You can sample data on the rising or falling edge of Counter
n
Sample Clock.
Routing Counter
n
Sample Clock to an Output Terminal
You can route Counter
n
Sample Clock out to any PFI terminal. The PFI circuitry inverts the
polarity of Counter n Sample Clock before driving the PFI terminal.
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 terminal.
Frequency Output Signal
The Frequency Output (FREQ OUT) signal is the output of the frequency output generator.
