6225 DAQmx names for measurements of the differential pair

All,

I came across this post trying to find out if there was documentation to show who's analog inputs are coupled together and what name DAQmx controls call these pairs.

http://forums.NI.com/T5/Multifunction-DAQ/device-pinout-for-the-PCI-6225-in-differential-AI-mode/m-p...

Messages from the author a drawing which I think is correct, but it is not an official document of OR.  I'm looking for documents that says exactly what the name is for each pair during their use in a command DAQmx.  I know literature 6225 AI0 and AI8 form a pair, and AI1 and AI9 are a pair, etc. etc.   What I was trying to find, is documentation that shows that the name of each of these pairs, what I should do in the DAQmx calls during a differential measure.  Currently, I am assuming that the AI0/AI8 pair is referred to as AI0 when the measure differential.  I have just followed the list of pairs in the manual of the user from left to right and from top to bottom and naming of AI0 to AI39.  I really was hoping that there was an official document that says what were the names of each differential pair.

Can you point me to the appropriate document or tell me that it is not an and that my assumptions are correct?

Thank you!

Doug

Doug,

There is not an official document similar to the one in the related post that shows the AI0 + and AI0-. The differential channel will always be referred to by the positive terminal. It doesn't matter what differential channel number it is. For example, the Channel 9 differential uses AI16 as the positive terminal. All configurations in DAQmx must be configured using AI16 in differential mode. The drawing was published is not official, but it is correct.

Kind regards

Danny F

Tags: NI Hardware

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