Triggering; Triggering With A Digital Source - National Instruments DAQ X Series User Manual

Triggering

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.
All X Series devices support internal software triggering, as well as
external digital triggering. Some devices also support analog triggering.
For information about the different actions triggers can perform for each
sub-system of the device, refer to the following sections:
•
•
•
Note Not all X Series devices support analog triggering. For more information about
triggering compatibility, refer to the specifications document for your device.

Triggering with a Digital Source

Your DAQ device can generate a trigger on a digital signal. You must
specify a source and an edge. The digital source can be any of the PFI,
RTSI, or PXI_STAR signals.
The edge can be either the rising edge or falling edge of the digital signal.
A rising edge is a transition from a low logic level to a high logic level.
A falling edge is a high-to-low transition.
Figure 11-1 shows a falling-edge trigger.
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The Analog Input Triggering
The Analog Output Triggering
The Counter Triggering section of Chapter 7,
5 V
Digital Trigger
Falling Edge Initiates Acquisition
Figure 11-1. Falling-Edge Trigger
11-1
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section of Chapter 4, Analog Input
section of Chapter 5, Analog Output
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X Series User Manual