Using daq

[Clint Eastwood]

Using DAQMX can you select ( hardcode) only channels you want to select ?

I have a 6225 with 12 DAQ Cards.  When I run self test DAQ1 uses Ch's 1-24 and 26-79.  DAQ2 uses Ch's 1,3 5, 7 60-79.  I want to use the same vi just wire in different channels to read when the card is selected.

In the resulting array are the elements in the order the channels were read ?  ie element 0 is ch 1 ( in the above example) element 1 is ch2 etc .  Since you're not reading ch 25 ch 26 reading will end up in element 25 ?

[devchander]

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In the resulting array are the elements in the order the channels were read ?  ie element 0 is ch 1 ( in the above example) element 1 is ch2 etc .  Since you're not reading ch 25 ch 26 reading will end up in element 25 ?

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Yes, your understanding is correct

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Using DAQMX can you select ( hardcode) only channels you want to select ?

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A slightly confusing statement! can you be a bit clearer??

[Clint Eastwood]

If I open a blank vi, go to:

Functions>NI Measure>DAQMX DATA AQ and create DAQXMxREAD.vi on the block diagram.  I can create a constant on the task/channel in wire of the DAQMXRead.vi.  I have a 6225 card installed.  That i/o constant I just created has either  ( just as an example) "PXISlot2ai0:ai72" or I can select an individual channel  "PXISlot2ai0" or "PXISlot2ai1" or "PXISlot2ai0"   What if I want to skip channel 16  and also channels 24-26 ?  How do you create that array of channels to do that? 

Thanks !

[devchander]

Just seperate each physical channel name by a comma as shown in the attached sample vi

[Clint Eastwood]

I have LV 7.1

[Dennis_Knutson]

When you create a channel constant, you have the 'browse' option. Select this. Then, hold down the Ctrl key and select non-consectutive channels. This is the easiest way to select channels and then you will see the syntax for yourself if you ever want to enter them manually. As mentioned, it is just a channel name separated by commas i.e. Dev1/ai0, Dev1/ai2, Dev1/ai4.

[Clint Eastwood]

Thank-you.