© National Instruments | 3-7
cDAQ-9185/9189 User Manual
Using an Analog Source
Some C Series modules can generate a trigger based on an analog signal. In NI-DAQmx, this is
called the Analog Comparison Event.
When you use an analog trigger source, the acquisition stops on the first rising or falling edge of
the Analog Comparison Event signal, depending on the trigger properties.
Note Depending on the C Series module capabilities, you may need two modules
to utilize analog triggering.
Routing the Reference Trigger Signal to an Output Terminal
You can route Reference Trigger to any output PFI terminal. Reference Trigger is active high by
default.
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.
Using a Digital Source
To use the Pause Trigger, specify a source and a polarity. The source can be either from PFI or
one of several other internal signals on your cDAQ chassis. Refer to the Device Routing in MAX
topic in the NI-DAQmx Help or the LabVIEW Help for more information.
Using an Analog Source
Some C Series modules can generate a trigger based on an analog signal. In NI-DAQmx, this is
called the Analog Comparison Event.
When you use an analog trigger source, the internal sample clock pauses when the Analog
Comparison Event signal is low and resumes when the signal goes high (or vice versa).
Note Depending on the C Series module capabilities, you may need two modules
to utilize analog triggering.
Note Pause triggers are only sensitive to the level of the source, not the edge.
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