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Compare Signals in Formula

Sean T
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When creating a value based condition, the usual default is the Identify -> Value Search tool, but it is also possible using Formula with common math operators like <, <=, >, >=, == (is equal to), != (is not equal to), and && (logical and) for use as signal against scalar, or signal against signal comparisons! 

Whenever the mathematical condition is met, a condition will be created just like a typical Value Search. For more information, search for "Comparisons" in your formula documentation.

Here are a few examples of these operators in use:

Signal and scalar comparison:


Signal and scalar comparison with logical and:


Signal against Signal:


In addition to the common math symbols, there are also some new concise ways to search for other signal states:

  • $signal.isValid() - make a condition that enumerates when the signal has data
  • $signal.isNotValid() - make a condition that enumerates the gaps in the signal
  • $signal.isBetween(10, 20) - make a condition whenever the signal is between 10 and 20
  • $signal.isNotBetween(10, 20) - make a condition whenever the signal is outside the boundary of 10-20

Also for string signals, you can search for regular expressions or glob-like syntax:

  • $signal ~= "*STAG*" - find whenever the state signal contains "STAG".
  • $signal !~ "*STAG*" - find whenever the state signal does not contain "STAG".

All of these things can be combined and given precedence with parenthesis. For example, to find "when is temp < 90 and either of humidity > 60 or compressor is off "

$temp < 90 && ( $humidity > 60 || $compressor == 'OFF')

Content Verified DEC2023

Edited by Kelly Kolotka
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