Using A Digital Source; Using An Analog Source; Outputting The Ai Start Trigger Signal - National Instruments DAQPad-6020E User Manual

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Using a Digital Source

To use ai/StartTrigger with a digital source, specify a source and an edge.
The source can be an external signal connected to any PFI or RTSI <0..6>
pin. The source can also be one of several internal signals on your DAQ
device. Refer to Device Routing in MAX in the NI-DAQmx Help or the
LabVIEW 8.x Help for more information.
Also, specify whether the measurement acquisition begins on the rising
edge or falling edge of the ai/StartTrigger signal.
Figure 2-19 shows the timing requirements of the ai/StartTrigger source.
Rising-Edge
Polarity
Falling-Edge
Polarity
Figure 2-19. ai/StartTrigger Timing Requirements

Using an Analog Source

When you use an analog trigger source, the acquisition begins on the first
rising edge of the Analog Comparison Event signal. Refer to Chapter 10,
Triggering, for more information on analog triggering.

Outputting the AI Start Trigger Signal

You can configure the PFI 0/AI START TRIG pin to output the
ai/StartTrigger signal. The output pin reflects the ai/StartTrigger signal
regardless of what signal you specify as its source.
t
w
t = 10 ns minimum
w
2-33
Chapter 2 Analog Input
E Series User Manual