CR200/CR200X Series Dataloggers - Campbell Scientific

Section 9. Programming
The following commands and logical operators are used to construct logical
expressions. CRBASIC EXAMPLE. Logical Expression Examples p. 89
demonstrate some logical expressions.
• IF
• AND
• OR
• NOT
• XOR
• IIF
Table 11. Logical Expression Examples
If X >= 5 then Y = 0
Sets the variable Y to 0 if the expression "X >= 5" is true, i.e. if X is greater than or equal to 5. The CR200(X) evaluates
the expression (X >= 5) and registers in system memory a -1 if the expression is true, or a 0 if the expression is false.
If X >= 5 OR Z = 2 then Y = 0
Sets Y = 0 if either X >= 5 or Z = 2 is true.
If X >= 5 AND Z = 2 then Y = 0
Sets Y = 0 only if both X >= 5 and Z = 2 are true.
If 6 then Y = 0.
"If 6" is true since "6" (a non-zero number) is returned, so Y is set to 0 every time the statement is executed.
If 0 then Y = 0.
"If 0" is false since "0" is returned, so Y will never be set to 0 by this statement.
Z = (X > Y).
Z will equal -1 if X > Y, or Z will equal 0 if X