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Synchronizing DSA and SMIO Devices With a Single NI-DAQmx Task

Primary Software: LabVIEW Development Systems
Primary Software Version: N/A
Primary Software Fixed Version: N/A
Secondary Software: Driver Software>>NI-DAQmx
Hardware: Modular Instruments>>Dynamic Signal Acquisition and Analysis (DSA)

Problem:
I'm using several DSA cards for an application which requires them to be synchronized. What is the easiest and most efficient way to accomplish this?

Solution:
Multidevice task support for DSA devices began with NI-DAQmx 8.0 and for S Series MIO devices beginning with NI-DAQmx 8.1. The multidevice task provides a very easy and efficient way to synchronize multiple devices, since NI-DAQmx handles all of the signal routing for you. It consists of simply adding multiple devices, separated by a comma, to the same task.


General Rules and Conditions:

        DSA and SMIO Boards
    • All channels in the task must be analog input channels.
        DSA Boards Only
    • If the task includes channels from both 446X and 447X devices, you must account for filter delay differences between the devices.
        PCI Devices
    • You must use a RTSI cable to connect the devices, and you must identify the cable in MAX.
        PXI Devices
    • The devices must all be in a single chassis, and you must identify the chassis in MAX (Measurement & Automation Explorer).
    • If the task includes channels from 447X devices, one of the 447X devices must be in PXI slot 2.
    • If the task includes channels from both 446X and 447X devices, a 446X device must be in PXI slot 2.

LabVIEW Code Architecture:
  • Old Method

  • New Method



  • Multidevice Tasks allow users to avoid having to program the synchronization of Sample Clock Timebase, Sync Pulse and Start triggers across multiple DSA devices.

Traditional DAQ Users:
  • If you are using an NI 4472 revision H or later with Traditional NI-DAQ (Legacy), you must use a version of Traditional NI-DAQ (Legacy) later than version 7.1. A feature added to the NI 4472 in revision H, low frequency alias rejection, requires the later version of the Traditional NI-DAQ (Legacy) driver.
  • If your NI 4472 does not appear in MAX and you are using an older version of NI-DAQ, install the latest version of NI-DAQ from the Drivers and Updates page on ni.com (linked below).


Related Links:
Drivers and Updates
KnowledgeBase 3YRERHJQ: NI Measurement & Automation Explorer Does Not Detect the NI 4472
KnowledgeBase 3EE7N2NQ: Synchronization with Dynamic Signal Acquisition (DSA) Products with NI-DAQmx

Attachments:


GoodSync.GIFPoorSync.GIFChannel.GIF


Report Date: 02/01/2006
Last Updated: 01/21/2008
Document ID: 3U0G7O9N

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