DAQmx Sample Quantity.Sample Per Channel Property Node

[jgcode]

[cross posted to ni.com]

Problem:

LabVIEW seems to be overriding a value of 1 to a value of 2 for the Sample Quantity.Sample Per Channel DAQmx Property Node for a Continuous acquisition mode.

Information:

I have a task set up in MAX (version 4.4.0f1).

When I set Samples To Read to 1 the task runs correctly in MAX.

When I read the task in LabVIEW (8.5) the Sample Quantity.Sample Per Channel property node (which is the Samples to Read) is coerced to a value of 2.

If the value is greater or equal to 2 in MAX then the Sample Quantity.Sample Per Channel property node in LabVIEW returns the correct value.

I get the same problem with a real device or a simulated device.

Question:

Is this desired behavior?

Side note:

If N Samples (finite buffer acquisition) is selected Samples To Read cannot be 1 as it causes an error 200077 - it must greater or equal to 2.

But no error occurs when the task is saved as Continuous (continuous buffer acquisition). I don't know if this is related. The error generated is:

Error -200077 occurred at DAQ Assistant

Possible Reason(s):

Measurements: Requested value is not a supported value for this property.

Property: SampQuant.SampPerChan

You Have Requested: 1

Valid Values Begin with: 2

Valid Values End with: 8589934590

Device: cDAQ3

Not Expected

Expected

[jgcode]

answer in cross post to ni.com