How can I choose the channel to acquire signals from a DAQ

[leo2b]

Hello,

I put here my VI.

I have configured some acquisition signals with a simulated periphéric (PCI 6221) with MAX to acquire a voltage.

 I would like during the execution of my VI to pick what signal I would acquire or not with a boolean, but I don't know how do that...

Can someone could help me please ?

[vt92]

Can you include the missing sub-vi?

[leo2b]

yes sorry this is the VIS

[AdnanZ]

You need to be more clear. Do you want to keep acquiring data from all three channels and display them in different graphs? In that case, do you want to use three booleans to start/stop acquiring data for each channel?

OR, do you just want to have one graph and start/stop displaying the acquisition on it using the three booleans?

[leo2b]

I want to have one graph and I choose with the booleans what signals I will put on the graph.

[AdnanZ]

OK great. And, you need to remember since you just have one card, you cannot have three AI channels running simultaneously for the same DAQ card, otherwise you will get a resource conflict. Have a look at the attached example (it's an NI example that I modified) which should satisfy what you want. If you have any questions, please post back!

Message Edited by Adnan Z on 06-30-2009 10:59 AM

[leo2b]

ok thank you, but I have Labview 8.5 and the example is for Labview 8.6...

Is it the same that the example in 8.5 version?

[AdnanZ]

Here you go; saved for version 8.0

Message Edited by Adnan Z on 07-01-2009 10:55 AM