Analog clarifying not adjusted read API

I use a USB-6009 box, and I will read the data to integer out of the device using the API C of NOR-DAQmx.  I understand that bypasses implementing scaling and offset that is applied when the bed is floating point.

Ideally, I would like to read signed, 16-bit data, so I use:

DAQmxReadBinaryI16

But I'm a little confused on how the documentation around this function is structured... it says:

DAQmxReadBinaryI16

"Reads multiple not adjusted,
16-bit integer samples in a task that contains one or more analog input has signed
channels. »

When I click on 'no', say the docs:

"Not adjusted data are in the native format of the unit, read directly from the.
device buffer without scale. The native format of a device can be a-8
16 or 32 bit integer, signed or unsigned. »

This means that no matter if I call DAQmxReadBinaryI16, DAQmxReadBinaryU16, DAQmxReadBinaryI32, or DAQmxReadBinaryU32, I get the same exact bits, and one of them is significant?  That is, should I choose the function corresponding to the native format of the device?  If so, how can I find the native format (it doesn't seem to be in the device manual)?

Also, what setting the range of minimum and maximum voltage (in my case using DAQmxCreateAIVoltageChan) when reading integer data unadjusted?  The relevant range of integer values is scaling in this sector?  That is, if I put the voltage range [-2,2], and I call it DAQmxReadBinaryU16, I would expect the value 0 corresponds to-2V and the value (2 ^ 16-1) corresponds to + 2V?  (I know this scaling can be non-linear, and that's what I lose
out in using is not a floating point read.)

Thank you!

-Dan

Hi Dan,.

If you read no adjusted binary data, you can then apply the calibration constants applied to the card after calibration using a channel DAQmx property node.  "" "" Configure the node property as follows: analog input "General Properties" Advanced "Coefficients of scale of the device" Coefficients of scale of the device.  You can enter these values to a table indicator or use them as described in an article in the knowledge base.

Here is the article from the knowledge base that explains how to interpret the non-adjusted data and resize it and calibrate accordingly.

Best,

Tags: NI Hardware

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