NI example for writing and reading from different DAQmx channels simultaneously

[Daniel Coelho]

Hello all,

is there an example for writing and reading the Dev1/ai0, Dev1/ai1, Dev1/ao0 and Dev1/ao1 simultaneously?

Or a similiar example?

I wish to generate a wave and simultaneously read its THD and even read a signal from a Digital Function Generator ans its THD too.

All simultaneously.

Please let me know if LabWindows/CVI install these examples and where.

Thanks in advance for the help.

Daniel Coelho

Portugal

[Nacer_M]

Hello,

You can use this exemple :

http://zone.ni.com/devzone/cda/epd/p/id/2333

If you want the "Dev1/ai0, Dev1/ai1", in Physical Channel you will write :  Dev1/ai0:1

If you want the " Dev1/ao0 and Dev1/ao1 ", in Physical Channel you will write :  Dev1/ao0:1

Don't forget that for a M or E series, you can create only one task for the acquisition.

Regards,

[Daniel Coelho]

Hi,

thank you for your reply.

I've seen that example but I think that it only uses one write channel at a time.

I need to use both AO0 and AO1 at the same time.

And finally, my card is PCI 4461.

I'm trying to use DAQmxCreateAOFuncGenChan() but I'm not sure about the sequence needed to start the task and generate the wave.

Can you help some more?

Thanks in advance.

Daniel Coelho

[Daniel Coelho]

HI,

I managed to solve this problem saving the signal from each channel to a separate buffer, I devided in half the buffer used to read/write from/to the DAQmx, the first half is from the first channel and the second half from the second channel.

Seems to work but I know it isn't the perfect solution.

Regards,

Daniel Coelho