Chapter 2
NI 5450 Overview
©
National Instruments Corporation
2-13
NI PXIe-5450 User Manual
Wait for Trigger
—After initiating generation, the device shifts to the Wait
for Trigger state. If the trigger source is immediate, the device immediately
shifts from this state and generates a Started event. If the trigger sources are
configured for a software trigger or for a hardware trigger from one of the
available sources, the device remains in this state until the configured
trigger occurs. When the device recognizes a trigger condition, the device
immediately shifts out of this state and generates a Started event.
First Data Appears
—This state is temporary and indicates that waveform
data is just starting to appear at the front panel connector.
Generation
—In the Generation state, the device is generating a waveform
as specified by the session attributes configured. Dynamic (or on-the-fly)
properties and attributes, such as the Amplitude, Arbitrary Waveform Gain,
and Arbitrary Waveform Offset properties, or the
NIFGEN_ATTR_FUNC_AMPLITUDE
,
NIFGEN_ATTR_ARB_GAIN
, and the
NIFGEN_ATTR_ARB_OFFSET
attributes, are applied immediately to
hardware. Started Event trigger is generated as the device recognizes
triggers. Depending on the configured trigger mode, the device may stay in
the Generation state until the generation is aborted.
Dynamic properties and attributes, such as amplitude, gain, and offset, can
be applied to the device immediately if you set them while the session is in
the Generation state. Refer to the
NI-FGEN LabVIEW Reference
or the
NI-FGEN C Function Reference
for information about the specific
property or attribute that you want to set during generation.
Done
—The device has completed the waveform generation as configured
for this session. This state only occurs at the end of a generation state
configured for the Single trigger mode. The device remains in this state
until the you use NI-FGEN to abort the waveform generation and to return
the device to the Idle state.
Hardware Error
—An internal hardware error occurred, such as data
underflow, the PLL became unlocked, the device shut down due to an
over-temperature condition, and so on. The signal generator may still be
generating and may be unpredictable at this point. When the driver software
checks the status of the device, an error is returned.
