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Chapter 5 Counters
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.
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