Synchronization of multiple USB-4431

Hi,
Can multiple USB-4431 units be synchronized together using the digital i/o port to share the sample clock? looked at docs but I don't fully understand the pin assignments for the digital i/o connector.
If it is possible would it require labview level timing or would NIDAQmx handle it via channel expansion?
Thanks.

I believe I have found the answer. Yes the clock can be shared via PFI0 and setting one master device with additional devices as slaves.
References:
https://decibel.ni.com/content/docs/DOC-3864
http://forums.ni.com/t5/Multifunction-DAQ/Synchronous-data-acquisition-using-two-NI-USB-6251-Datalog...
http://digital.ni.com/public.nsf/allkb/8CD44F64AFAC6EAC862572CF0059A48F?OpenDocument
http://www.ni.com/white-paper/6829/en/

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Hi,
I am using the NI USB-4431. I would like to generate a signal and make a data acquisition but during the task "daqmx write" it appears an error (error code 200077).
I also have the NI PXIe-1082 with the acquisition card NI PXI-4461 and it works correctly... so I do not understand why the same code works with this card and not with the USB-4431 (I have naturaly changed the physical channel...)
You can see the printscreen and the code in attachment
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Cedric
Attachments:
Sinus excitation.vi ‏2088 KB
PrtSc1.JPG ‏145 KB

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To whom it may concern,
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Cameras (plugged into digital p0.0 channel/port)
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Currently,I am sending in a trigger to the camera to start taking photos. This trigger takes 2 miliseconds and then the labview program tells the forcesensor and testing machine to start. This creates a delay between the camera, force sensor and testing machine. THis makes it difficult to analyze data.
I want the testing machine, cameras, and force sensor to start taking pictures at the same time. I was told that the best way to do this would be to send in a square wave at my desired sampling rate (ex. 15,000) into the DAQ. This would synchronize everything so that it started capturing data at the same time once a trigger was sent in.
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It sounds that what you're looking for is a deterministic system response. Determinism is the ability to say that at a certain point in your program, a certain function will happen within a certain amount of time, plus or minus some variation (Jitter). On an Operating System that isn't Real Time oriented, deterministic responses i.e. getting your 2ms long trigger to execute and then simultaneously begin the acquisition can't happen; this is because the OS gets in the way because of the way it schedules tasks.
For example, the same program can have two different timed responses for when you're running no programs in the background and when you're running an Internet browser. Even when the OS isn't running any background tasks you still cannot be absolutely certain that some other processor time is being used. Unfortunately, this is the limitation of a conventional OS; the processor's power is shared between multiple competing threads which have equal priorities. Furthermore, USB devices aren't deterministic either due to the serial protocols that they follow, which in their nature are indeterministic.
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Synchronization of multiple USB-4431

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