Language Elements
32
NetLinx Programming Language Reference Guide
 If it is non-zero, the channel associated with the device is turned on.
 If it is zero, the channel is turned off.
Conditionals
IF…ELSE
The IF...ELSE statement provides a structure for conditional branching of program execution. If a
condition evaluates to true, the statement(s) associated with it are executed; otherwise, statements are not
executed. An example is:
IF (<conditional expression 1>)
{
(* statements for condition 1 *)
}
ELSE IF (<conditional expression 2>)
{
(* statements for condition 2 *)
}
ELSE
{
(* statements for all other conditions *)
}
Regarding IF statements:
 ELSE IF is optional.
 Braces are generally recommended in all cases but are only required if multiple statements are
assigned to a given condition.
 IF statements may be nested to any number of levels.
SELECT…ACTIVE
The SELECT…ACTIVE statement provides a programming structure for selective execution of code
blocks based on the evaluation of a series of conditions. The first block whose
ACTIVE condition
evaluates to true is executed; the remaining blocks are ignored. If no
ACTIVE condition evaluates to true,
no statements are executed. An example is:
SELECT
{
ACTIVE (<condition 1>) :
{
(* statements for condition 1*)
}
ACTIVE (<condition 2>) :
{
(* statements for condition 2*)
}
ACTIVE (<condition n>) :
{
ACTIVE (1)
(* statements for condition n*)
}
}
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