National Instruments PCIe-6323, User Manual

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Chapter 4 Analog Input
– Hardware-timed single point (HWTSP)—Typically, HWTSP operations are used to
read single samples at known time intervals. While buffered operations are optimized
for high throughput, HWTSP operations are optimized for low latency and low jitter.
In addition, HWTSP can notify software if it falls behind hardware. These features
make HWTSP ideal for real time control applications. HWTSP operations, in
conjunction with the wait for next sample clock function, provide tight
synchronization between the software layer and the hardware layer. Refer to the
NI-DAQmx Hardware-Timed Single Point Lateness Checking document for more
information. To access this document, go to
ni.com/info
and enter the Info Code
daqhwtsp
.
Note ( NI USB-635 x /636 x and NI PXIe-6386/6396 Devices) X Series USB and
PXIe-6386/6396 devices do not support hardware-timed single point (HWTSP)
operations. For more information about special considerations for PXIe-6386 and
PXIe-6396 devices, go to
ni.com/info
and enter the Info Code
smio14ms
.
Analog Input Triggering
Analog input supports three different triggering actions:
• Start trigger
• Reference trigger
• Pause trigger
AI tasks will not support pause triggering on these devices.
Note ( NI PXIe-6386/6396 Devices) AI tasks do not support pause triggering on
PXIe-6386 and PXIe-6396 devices. For more information about special
considerations for these devices, go to
ni.com/info
and enter the Info Code
smio14ms
.
Refer to the AI Start Trigger Signal , AI Reference Trigger Signal , and AI Pause Trigger Signal
sections for information about these triggers.
An analog or digital trigger can initiate these actions. All Simultaneous MIO X Series devices
support digital triggering, but some do not support analog triggering. To find your device
triggering options, refer to the device specifications.