Data acquisition from two different DAQs

[nagesh15]

Hello all,

Can you please tell me how to synchronous data acquisition using two different DAQs connected by USB to the computer in LabVIEW.

Thankyou for help.

[crossrulz]

What DAQs are you using?  Depending on the DAQ, you may be able to export and import the sample clock.  But we need more information to make sure.

[nagesh15]

Thank you for your reply,

I am using 2 NI C series DAQs which are connected to computer using 2 separate NI cDAQ chassis. How to synchronise both DAQs for data acquisition.

[crossrulz]

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@nagesh15 wrote:

I am using 2 NI C series DAQs which are connected to computer using 2 separate NI cDAQ chassis. How to synchronise both DAQs for data acquisition.

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Again, WE NEED DETAILS.  What modules?  What chassis?

And why are you using multiple chassis?  I would just get a chassis that can hold both modules and then you just create a single task with all of the channels you need and the chassis will take care of everything for you there.

[JensG69]

I would start with a trial:

One DAQmx task that incorporates the two modules (assuming that both are of the same kind, like two AI-modules).

Otherwise please be more specific: which c-modules, which cDAQ chassis, what would you like to synchronize?

Regards, Jens

[nagesh15]

I am using 2 NI cDAQ 9171 chassis and 2 C series 9215 modules. 

How to sync these 2?

[nagesh15]

I am using 2 NI cDAQ 9171 chassis and 2 C series 9215 DAQs. How to sync these 2.

[crossrulz · Accepted solution]

I'm not seeing anything from those to export/import a synchronization signal.  I would just invest in a cDAQ-9174 (4 slot USB cDAQ chassis), put both 9215 modules in it, and the rest is done for you as you will just need to create a single DAQmx task containing channels from both modules.

[nagesh15]

That means we can not sync both 9215 in 2 different chassis!

What if we want a different sampling rate and no. of samples for 9215 in 9174? Can we do that?

[JensG69 · Accepted solution]

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@nagesh15 wrote:

That means we can not sync both 9215 in 2 different chassis!

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Not in two single chassis.

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What if we want a different sampling rate and no. of samples for 9215 in 9174? Can we do that?

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Yes, just define two independent AI tasks for the two 9215 modules.

Regards, Jens