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behavior. The arm start trigger can be used for synchronizing multiple counter input and
output tasks.
When using an arm start trigger, the arm start trigger source is routed to the Counter n
HW Arm signal.
•
Start Trigger—You can use the start trigger for counter output functions. You can
configure a start trigger to begin a finite or continuous pulse generation. After a
continuous generation has triggered, the pulses continue to generate until you stop the
operation in software. For finite generations, the specified number of pulses is generated
and the generation stops unless you use the retriggerable attribute. When you use this
attribute, subsequent start triggers cause the generation to restart.
When using a start trigger, the start trigger source is routed to the Counter n Gate signal
input of the counter. Possible triggers for counter output operations are a hardware signal.
For counter input functions, you can use the arm start trigger to have start trigger-like
behavior.
•
Pause Trigger—You can use pause triggers in edge counting and continuous pulse
generation applications. For edge counting acquisitions, the counter stops counting edges
while the external trigger signal is low and resumes when the signal goes high or vice
versa.
For continuous pulse generations, the counter stops generating pulses while the external
trigger signal is low and resumes when the signal goes high or vice versa.
When using a pause trigger, the pause trigger source is routed to the Counter n Gate
signal input of the counter.
Default Counter/Timer Routing
Counter/timer signals are available to parallel digital I/O C Series modules. To determine the
signal routing options for modules installed in your system, refer to the Device Routes tab in
MAX.
You can use these defaults or select other sources and destinations for the counter/timer signals
in NI-DAQmx. Refer to "Connecting Counter Signals" in the NI-DAQmx Help or the
LabVIEW Help for more information about how to connect your signals for common counter
measurements and generations. Refer to "Physical Channels" in the NI-DAQmx Help or the
LabVIEW Help for a list of default PFI lines for counter functions.
Other Counter Features
The following sections list the other counter features available on the cRIO controller.
•
Cascading Counters
•
Prescaling
•
Synchronization Modes
cRIO-904x User Manual | © National Instruments | 75
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