Analog Input Triggering; Connecting Analog Input Signals - National Instruments 636 Series User Manual

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
the Info Code
daqhwtsp
Note (NI USB-634
hardware-timed single point (HWTSP) operations.

Analog Input Triggering

Analog input supports three different triggering actions:
• Start trigger
• Reference trigger
• Pause trigger
Refer to the AI Start Trigger
sections for information about these triggers.
An analog or digital trigger can initiate these actions. All 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.

Connecting Analog Input Signals

Table 4-3 summarizes the recommended input configuration for both types of signal sources.
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Signal, AI Reference Trigger
ni.com/info
USB X Series devices do not support
Signal, and AI Pause Trigger Signal
and enter