Issue
How to display the true position of a return air damper on a Vista OGC graphic when using a common outside air/return air damper signal.
Product Line
TAC Vista
Environment
- TAC Vista IV
- OGC Graphics Editor
Cause
If an outside air damper is interlocked with the return air damper, then there will only be one 0-100% value in the Vista database. Some math is required to calculate the inverse position of the opposite damper.
Resolution
Entering the following formula in the Formula Section of the Attributes of a Digital Presentation:
C-100.00+C-1.00*
Note: the format for formulas in the OGC editor is Reverse Polish Notation.