Analog input, Analog input triggering, Ai start trigger signal – National Instruments NI WLS/ENET-9163 User Manual

Page 18

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NI WLS/ENET-9163 Carrier User Guide and Specifications

18

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Analog Input

To perform analog input measurements, insert a supported analog input
C Series I/O module into the NI WLS/ENET-9163 carrier. The
measurement specifications, such as number of channels, channel
configuration, sample rate, and gain, are determined by the type of C Series
I/O module used. For more information and wiring diagrams, refer to the
documentation included with your C Series I/O modules.

Analog Input Triggering

A trigger is a signal that causes an action, such as starting or stopping the
acquisition of data. When you configure a trigger, you must decide how
you want to produce the trigger and the action you want the trigger to cause.
The NI WLS/ENET-9000 Series device supports internal software
triggering and external digital triggering.

Three triggers are available: AI Start Trigger Signal,

AI Reference Trigger

Signal

, and

AI Pause Trigger Signal

.

AI Start Trigger Signal

Use the AI Start Trigger (ai/StartTrigger) signal to begin a measurement
acquisition. A measurement acquisition consists of one or more samples. If
you do not use triggers, begin a measurement with a software command.
Once the acquisition begins, configure the acquisition to stop in one of the
following ways:

When a certain number of points is sampled (in finite mode)

With a software command (in continuous mode)

An acquisition that uses a start trigger is sometimes referred to as a
posttriggered acquisition. That is, samples are measured only after the
trigger.

Using a Digital Source

To use ai/StartTrigger with a digital source, specify a source and an edge.

NI-DAQmx can provide an internal start trigger or PFI 0 may be used.

Refer to the Device Routing in MAX topic in the NI-DAQmx Help or the
LabVIEW Help in version 8.0 or later for more information.

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