MAX newbie confused on data configuration

[jtdavies]

I'm trying to get a handle on an existing application that was written before I was hired.

I have a test Fieldpoint rig setup about the same as the production unit. I am able to communicate with the Fieldpoint in MAX and query it with LabWindows/CVI.

If I go into MAX and change the data configuration range from 0 to 20 volts to -120 volts to 120 volts, the reading in MAX doesn't change. Also, the value I read in LabWindows/CVI doesn't change either. I am hitting the Apply button.

So is this range adjustment used anywhere, or is it just for documentation?

(Attached is a screen capture of the value I am changing)

[RavensFan]

Is your analog input within the ranges that you are defining?  Are you changing the analog input between configuration changes?  Let's say you are putting in 10V,  it's within range of 0--20V.  It's also within range of 0-120V.  So you should be able to read the value with either range.  Of course with the larger range, you will have a little worse accuracy and/or resolution.  If you were trying to read 30V, then you wouldn't be able to read it at all with the 0-20V range, but would be able to read it with the 0-120V range.

[jtdavies]

Thank you, Ravens Fan.

It's so obvious now. I thought that the number was just a multiplier. The cFP-AI-102 is much more powerful and easier to use than I gave it credit for.