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Chapter 2
Using the Module
DSP Streams
The DSP streams in the PXIe-4340 perform the digital signal processing on the acquired data
before sending the data to software. There are two types of DSP streams: Buffered Mode streams
and Hardware-Timed Single Point streams. The PXIe-4340 has four streams for each of these
types and each stream handles one channel. Therefore, it is possible to use all 4 channels in either
Buffered Mode or Hardware-Timed Single Point Mode.
Accessory Auto-Detection
SC Express modules automatically detect compatible accessories or terminal blocks. The RSVD
pins on the I/O connector provide power to the accessories as well as digital communication
lines. This allows software to detect when accessories are inserted or removed. In addition,
software can automatically identify the specific terminal block as well as access any calibration
or scaling information associated with the terminal block.
MAX allows you to see which accessories are currently connected to your module. In MAX,
expand
Devices and Interfaces
and locate your module. If a terminal block is connected to your
module, it will be displayed beneath the module. Unsupported terminal blocks appear in MAX
with an X next to them.
NI-DAQmx property nodes can be used to programmatically access information about
connected accessories in your application. Refer to the
NI-DAQmx Help
for documentation
about programmatically accessing accessory status.