﻿This parameter defines the 24 (maximum) character string to be evaluated.
Input objects can be accessed through their letters (A, B, C, D).
The permitted operands are:

* "+"          arithmetic sum
* "-"          aritmetic subtraction
* "*"          arithmetic multiplication
* "/"          arithmetic division
* "&"          logic AND
* "|"          logic OR
* "^"          logic XOR
* "!"          logic NOT
* ">"          greater than
* "<"          less than
* "="          equal to
* "?" and ":"  ternary conditional
* "(" and ")"  grouping operands

Ternary conditional:
<condition>?<expression1>:<expression2>
Where:

* condition is the expression to be evaluated
* expression1 is evaluated when condition is TRUE
* expression2 is evaluated when condition is FALSE

expression1 or expression2 can be set as "N" when "no expression has to be evaluated"

Here are some examples:

* (A+B+C)/3   calculate the mean of the A, B, C objects
* A*9/5+32    convert object A Celsius degrees to Fahrenheit degrees
* A*1000      convert object A from KW t W
* A*3.6       convert object A from m/s to km/h

If wrong or unrecognized characters are used in expression, then it will be not processed and discarded.
