PXI 4472 Synchronize and Stream to Disk (DAQmx)

The attached VI, PXI 4472 Sync and Stream, synchronizes an arbitrary number of NI PXI-4472 DSA (Dynamic Signal Analyzer) devices. PXI DSA devices require two timing parameters to be shared between devices. The first signal is the "Master Clock Timebase," shared across the PXI_Star bus. The second signal is the Clock Divisor Reset pulse. This signal is shared across the PXI_Trig/RTSI bus. All boards share a common digital trigger along the PXI_Trig/RTSI bus.

The other attached VI, PXI 4472 Sync Reader, is a simple reader to examine the data logged from the acquisition. This VI allows you to scroll through data blocks to graphically locate a specific are of the streamed data file. The acquisition-setting parameters (number of blocks, number of boards) that you provide to the reader must be consistent with what you used to acurire the data. Any discrepancies will result in reading the file incorrectly.

Note: With NI-DAQmx 7.4 and later, DSA devices support a multidevice task which makes synchronization code much simpler. See the link below for an example which uses a multidevice task to synchronize DSA devices and then streams the data to disk.

Related Links:

Streaming Data to Disk Example (DAQmx)

Requirements

Filename: pxi_4472_sync_and_stream.zip

Software Requirements

Application Software: LabVIEW Full Development System 7.1
Language(s): LabVIEW

Hardware Requirements

Hardware Group: Dynamic Signal Analyzers (DSA)
Hardware Model: PXI-4472, PXI-4472B
Driver: NI-DAQmx 7.1

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