DAQmx not displaying readings from multiple channels

[kumv10]

Hi,

I am trying to acquire temperature readings from 3 consecutive channels using a DAQmx task as shown in the attached pic. 

I have a producer-consumer loop for quick reading and writing of the samples to a file.

To specify the channels, I have typed into the box wired to the 'physical channel' terminal (not shown in pic) as follows - SC1Mod2/ai2:4.  This is to acquire readings from analog channels 2,3 and 4. The program should then write readings from all 3 channels to a file.

The code works perfectly if I am acquiring samples from 1 channel only.

When I try to acquire from multiple channels, I can only see readings on one of the numeric indicators wired to the acquisition task.

I would appreciate any inputs on what might be wrong with the code.

Thank you.

[kumv10]

The broken wire seen in the pic is a result of adding multiple channels to the acquisition task.  I managed to get around that by specifying a different data type but even with an intact wire, the program doesn't display readings from the remaining 2 channels.

[crossrulz]

You need to change your queue data type to be an array of doubles.

[crossrulz · Accepted solution]

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@kumv10 wrote:

The broken wire seen in the pic is a result of adding multiple channels to the acquisition task.  I managed to get around that by specifying a different data type but even with an intact wire, the program doesn't display readings from the remaining 2 channels.

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Instead of using the To Dynamic Data Type and then Split Channels, just use an Index Array to get your three values.

[kumv10]

Thanks! Works perfectly.