Continuous Pulse Train Generation - National Instruments NI cDAQ-9181 User Manual

Figure 5-30 shows the same pulse train with CO.EnableInitalDelayOnRetrigger set to the
default False.
Figure 5-30. Retriggerable Single Pulse Generation False
Counter
Load Values
GATE
(Start Trigger)
SOURCE
The minimum time between the trigger and the first active edge is two ticks
Note
of the source.
For information about connecting counter signals, refer to the
section.

Continuous Pulse Train Generation

This function generates a train of pulses with programmable frequency and duty cycle. The
pulses appear on the Counter n Internal Output signal of the counter.
You can specify a delay from when the counter is armed to the beginning of the pulse train. The
delay is measured in terms of a number of active edges of the Source input.
You specify the high and low pulse widths of the output signal. The pulse widths are also
measured in terms of a number of active edges of the Source input. You also can specify the
active edge of the Source input (rising or falling).
The counter can begin the pulse train generation as soon as the counter is armed, or in response
to a hardware Start Trigger. You can route the Start Trigger to the Gate input of the counter.
You also can use the Gate input of the counter as a Pause Trigger (if it is not used as a Start
Trigger). The counter pauses pulse generation when the Pause Trigger is active.
Figure 5-31 shows a continuous pulse train generation (using the rising edge of Source).
SOURCE
4 3 2 1 0 2 1 0
OUT
Figure 5-31. Continuous Pulse Train Generation
OUT
Counter Armed
NI cDAQ-9181/9184/9188/9191 User Manual
4 3 2 1 0 2 1 0
5 3 2
Default Counter/Timer Routing
3
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