Configuration For Buffered Digital Input Acquisition - Advantech PCI-1716 User Manual

The advantages of buffered acquisition over instant acquisition include:
The sample rate can be much higher.

The time of sample is deterministic.

Hardware triggers can be used.

3.3.2

Configuration for Buffered Digital Input Acquisition

According to software configurations, buffered digital input acquisition can be classi-
fied into two types:
One-buffered digital input acquisition

Streaming digital input acquisition

3.3.2.1 One-Buffered Digital Input Acquisition
For one-buffered acquisition, only a specified number of samples is acquired. Both
the start and stop of acquisition are controlled by software commands. Only one type
of acquisition can be achieved: post-trigger acquisition.
Post-Trigger Acquisition
A post-trigger acquisition acquires a specified number of samples after the start trig-
ger. The acquisition starts when a start trigger is received and automatically stops
when the specified number of samples is acquired. An example of 5-sample post-trig-
ger acquisition is shown in Figure 3.17.
3.3.2.2 Streaming Digital Input Acquisition
For a streaming acquisition, the number of samples to be acquired is set to infinite.
The acquisition starts when a start trigger is received and continues until a stop trig-
ger is received as shown in Figure 3.18.
Figure 3.17 Post-trigger acquisition.
Figure 3.18 Streaming acquisition.
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