How do I programmatically determine if a device supports external calibration?

I'm writing a vi to determine the current state of a system with about 6 devices connected, consisting of two cDaq chassis with 9229 and 9269 modules and a few PXI cards. I want the vi to monitor when the devices were last calibrated and issue a warning if the device hasn't been calibrated within the accepted window. I can get the program to work as long as the device I'm polling supports external calibration, but naturally I get an error if it doesn't. I can't seem to find a property node or the like to determine this. Any help would be great.
This is a gross simplification of what I'm trying to accomplish:
Attachments:
calibration snippet.png ‏16 KB

Well, the trick is that while all of the C modules may be calibratable, the chassis is not. For example, if I have a cDAQ-9178 with 3 9269 units and 5 9229s and I query the system for devices it returns an array with 9 elements because the chassis is detected. If I then loop through those array elements in a for loop and query the last calibration date, I get the error:
Error -200197 occurred at Property Node DAQmx Calibration Info (arg 2) in Untitled 3
Possible reason(s):
Device does not support this property.
Property: ExtCal.LastDate/Time
Short of clearing the error and moving on, I don't know how to get around this. I've attached a new snippet in the hopes that it will better illustrate what I'm attempting.
Thanks again for your help,
Tanner Blair
Attachments:
calibration.png ‏25 KB

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