Analog Input Triggering Signals
- Updated2024-12-11
- 1 minute(s) read
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.
Three triggers are available: Start Trigger, Reference Trigger, and Pause Trigger. An analog or digital signal can initiate these three trigger 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. To find your module triggering options, refer to the documentation included with your C Series modules. For more information about using digital modules for triggering, refer to Using the Digital Input/Output.
Refer to the related topic links below for for more information about the analog input trigger signals.
Related Information
- Using the Digital Input/Output
- AI Start Trigger Signal
Use the Start Trigger signal to begin a measurement acquisition.
- AI Reference Trigger Signal
Use Reference Trigger to stop a measurement acquisition. To use a reference trigger, specify a buffer of finite size and a number of pretrigger samples (samples that occur before the reference trigger). The number of posttrigger samples (samples that occur after the reference trigger) desired is the buffer size minus the number of pretrigger samples.
- AI Pause Trigger Signal
You can use the Pause Trigger to pause and resume a measurement acquisition. The internal sample clock pauses while the external trigger signal is active and resumes when the signal is inactive. You can program the active level of the pause trigger to be high or low.