Advanced Programming; Statement Evaluation Order - Neptune Systems AquaController II Owner's Manual

control module to remain in the off state for a minimum of 10 minutes
before being allowed to turn back on. The off state was chosen as the
"sticky" state so that H2O pump will not stay in the on state for a
minimum of 10 minutes; in some systems this may add too much water
to the system. In general it is only necessary to use this command when
there is single value of a monitored parameter (pH, ORP, Temp) that
can cause the control module to turn both on and off.
Note: In order for either of the above two programs to operate
correctly, the statements must be in the same order as shown above.
The AquaController II evaluates the program statements from top to
bottom, and if the 'If pH > 8.30' was executed first the desired
operation would not be achieved.

Advanced Programming

This section explains some of the complicated programming styles that
are possible with the AquaController II. Most users will not have to
worry about these subtleties. If you attempt to program the
AquaController II in a non-standard way, experiment with the program
on a non-critical sub-system of the tank. A buggy program could be
potentially dangerous to your tank's inhabitants.

Statement Evaluation Order

Most programs do not care which way program statements are entered,
however there are some cases in which order is important. The program
statements are executed in the ordered listed by entering the serial port
command 'l'. The one exception to this rule is program statements that
start with 'If Time'. The 'If Time' statements are executed first
regardless of where they are located in the program code. This
requirement is necessary due to the circular nature of 'Time' type
statements (i.e. the cycle repeats day after day). The execution order can
also be displayed on the LCD screen by selecting Modify State in
Setup:Timer Setup:Timer Program:Timer and scrolling from first
statement to the last by pressing the Down button.
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AquaController II Owner' s Manual V1.00b
Copyright 1998/1999 - Neptune Systems
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