© National Instruments | 4-3
cDAQ-9185/9189 User Manual
Analog Output Triggering Signals
A trigger is a signal that causes an action, such as starting or stopping the acquisition of data.
When you configure a trigger, you must decide how you want to produce the trigger and the
action you want the trigger to cause. The cDAQ chassis supports internal software triggering,
external digital triggering, analog triggering, and internal time triggering.
Analog output supports two different triggering actions: AO Start Trigger and AO Pause Trigger.
An analog or digital signal can initiate these actions. Time can also initiate the Start Trigger. Up
to two C Series parallel digital input modules can be used in any chassis slot to supply a digital
trigger. An analog trigger can be supplied by some C Series analog modules.
Refer to the AO Start Trigger Signal and AO Pause Trigger Signal sections for more information
about the analog output trigger signals.
Analog Output Timing Signals
The cDAQ chassis features the following AO (waveform generation) timing signals:
• AO Sample Clock Signal*
• AO Sample Clock Timebase Signal
• AO Start Trigger Signal*
• AO Pause Trigger Signal*
Signals with an * support digital filtering. Refer to the PFI Filters section of Chapter 5, Digital
Input/Output and PFI, for more information.
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