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National Instruments Corporation
11-1
11
Triggering
A trigger is a signal that causes a device to perform an action, such as
starting an acquisition. You can program your DAQ device to generate
triggers on any of the following:
•
A software command
•
A condition on an external digital signal
•
A condition on an external analog signal
You can also program your DAQ device to perform an action in response to
a trigger. The action can affect the following:
•
Analog input acquisitions
•
Analog output generation
•
Counter behavior
For more information about analog input triggering, refer to Chapter 4,
. For more information about analog output triggering, refer to
. For more information about counter triggering,
refer to Chapter 7,
Note
(NI 6154 Only)
NI 6154 devices do not support analog triggering. For information
about the triggering capabilities of your device, 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 input
PFIs or RTSI <0..6> 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.
