National Instruments NI 6323 User Manual

Chapter 4 Analog Input
© National Instruments 4-11 X Series User Manual
If data cannot be transferred across the bus fast enough, the FIFO
becomes full. New acquisitions overwrite data in the FIFO before
it can be transferred to host memory. The device generates an error
in this case. With continuous operations, if the user program does
not read data out of the PC buffer fast enough to keep up with the
data transfer, the buffer could reach an overflow condition,
causing an error to be generated.
• 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 Developer Zone document,
NI-DAQmx Hardware-Timed Single Point Lateness Checking, for
more information. To access this document, go to
ni.com/info and
enter the Info Code
daqhwtsp.
Note (NI USB-634x/6351/6353//6361/6363 Devices) X Series USB devices do not support
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 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 MIO X Series
devices support digital triggering, but some do not support analog
triggering. To find your device triggering options, refer to the specifications
document for your device.
Connecting Analog Input Signals
Table 4-3 summarizes the recommended input configuration for both types
of signal sources.
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National Instruments NI 6323 Specifications

General

Brand	National Instruments
Model	NI 6323
Category	I/O Systems
Language	English