Справочник Пользователя для National Instruments 321645c-01
Chapter 2
Function Reference — AO_Change_Parameter
NI-DAQ FRM for PC Compatibles
2-34
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National Instruments Corporation
Trigger Mode
Some devices can generate the waveforms stored in the memory on board in different ways
by setting the trigger mode parameter.
by setting the trigger mode parameter.
The following trigger modes are possible on the DAQArb 5411 devices:
Single
The waveform described by the user in the sequence list
1
is
generated once by going through all the sequence list. Only a
start trigger is required.
start trigger is required.
Continuous
The waveform described by the user in the sequence list is
generated infinitely by recycling through all of the sequence list.
Only the start trigger is required.
generated infinitely by recycling through all of the sequence list.
Only the start trigger is required.
Stepped
After the start trigger, the waveform described by the first
sequence entry is generated. It then waits for another trigger. At
the time of triggering, the waveform described by the second
sequence entry is generated, and so on. When all of the sequence
list is exhausted, it returns to the first sequence entry.
sequence entry is generated. It then waits for another trigger. At
the time of triggering, the waveform described by the second
sequence entry is generated, and so on. When all of the sequence
list is exhausted, it returns to the first sequence entry.
Burst
After the start trigger has been implemented, the waveform
described by the first sequence entry is generated until another
trigger is implemented. At the time of triggering, the earlier
waveform is completed before the waveform described by the
second sequence entry is generated and so on. When all of the
sequence list is exhausted, it returns to the first sequence entry.
described by the first sequence entry is generated until another
trigger is implemented. At the time of triggering, the earlier
waveform is completed before the waveform described by the
second sequence entry is generated and so on. When all of the
sequence list is exhausted, it returns to the first sequence entry.
To change the trigger mode setting, set paramID to
ND_TRIGGER_MODE
.
1
A sequence list is used in staging-based waveform generation for linking, looping, and
generating multiple waveforms stored on the onboard memory. The sequence list has a list of
entries. Each entry is called a stage. Each stage specifies which waveform to generate and the
other associated settings for that waveform (for example, the number of loops). For more
details on staging-based waveform generation, refer to
entries. Each entry is called a stage. Each stage specifies which waveform to generate and the
other associated settings for that waveform (for example, the number of loops). For more
details on staging-based waveform generation, refer to
WFM_Load
in this manual. For more
details on triggering and trigger sources, refer to your DAQArb 5411 User Manual.
Table 2-12. Parameter Setting Information for Frequency Correction for the Analog Filter
Device Type
Per Channel
Selection Possible
Legal Range
for
paramValue
Default Setting
for paramValue
DAQArb AT-5411
DAQArb PCI-5411
DAQArb PCI-5411
Yes
0 through
16,000,000
0