Initialization; Persistence; Operators; Calculations - Universal Devices ISY-994i User Manual

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8.2.6 Initialization

• At start-up, all variables are initialized to their predefined init value, or zero, if no

init value has been specified. The init value may be set by editing the init value in the

table containing the variable definitions.

• The init value may also be set in programs, thus providing a means of persisting

values across restarts.

x : A variable a : Either a variable or an integer constant

Initialize $x Init To a

This sets the init value for this variable, it does not modify the current value of the variable.

You may of course set the init value to the current value of the variable by doing this:

$x Init To $x

It may be desirable to maintain the value of some variables across restarts of the ISY. This

must be done explicitly by changing the init value of the variable (as described above).

One of the reasons we don't automatically persist all of the variables is that the value of a

variable would have to written to persistent storage (a file on the SD Card) each time it

All operations are in the form $variable op <value or variable>.

Most operations do both a calculation and assignment, for example:

$counter += 1

is equivalent to the more familiar

$counter = $counter + 1

x : A variable