Справочник Пользователя для National Instruments NI WLS/ENET-9163

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.

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, 

, and 

. 

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. 

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.