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Chapter 4
Arb Operation
RTSI Trigger
External Trigger
Software Trigger
Trigger Select
Modes of Operation
DAQArb 5411 User Manual
Digital
MUX
Figure 4-8. Waveform Generation Trigger Sources
If you need to automatically trigger the waveform generation, use
software to generate the triggers. A rising TTL edge is required for
external triggering. For more information on triggering over RTSI lines,
see the RTSI Trigger Lines section later in this chapter.
DAQArb 5411 functionality is further enhanced by various triggering
modes available on it. The available trigger modes are single,
continuous, stepped, and burst. These trigger modes are available for
both arb and DDS modes.
Single Trigger Mode
The waveform you describe in the sequence list is generated only once
by going through the entire staging list. Only one trigger is required to
start the waveform generation.
You can use single trigger mode with the both the Arb and DDS
waveform generation modes, as follows:
•
Arb mode—Figure 4-9 uses the stages 1, 2, and 3 shown in
Figure 4-4 to illustrate a single trigger mode of operation for Arb
waveform generation mode. After the DAQArb 5411 receives a
trigger, the waveform generation starts from the first stage and
continues through to the last stage. The last stage is generated
repeatedly until you stop the waveform generation.
Start Trigger
4-12
RTSI Trigger
Lines <0..6>
7
© National Instruments Corporation
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