AMX Axcess, Instruction Manual

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Axcess Basics
5
Axcess Programming Language
Axcess Basics
Format of the Programming Language
The Axcess programming language is in a free format, meaning that the source code is independent
of tabs and carriage returns. Utilize tabs and carriage returns in a consistent method of code
placement to make the code readable. In this manual, the following outline format is used:
IF (X = 1)
{
PUSH[PANEL,1]
{
Y = 2
Z = 3
}
}
However, the above program statement executes the same even if it looks like this:
IF(X = 1) {PUSH[PANEL,1] {Y = 2 Z = 3}}
The syntax is identical, but the spacing is different. The first method is recommended because it is
easier to read, and adheres to Axcess programming conventions.
Statements and Compound Statements
In Axcess programming, most keywords and operators require a complete statement. A keyword is
a word or series of words signifying the operation for Axcess to execute; the keyword and all its
parameters form the statement. For example, the keyword to turn a channel on is ON, and the
statement to turn on a particular channel is ON [RELAY_CARD,RELAY].
Statements can also involve mathematical or logical operations when operators are used. An
operator is a character that performs a specific mathematical or relational function. For example,
the operator used to set a variable equal to a value is '='. For example, the statement used to set
variable X to the number 5 is X = 5. The following table lists special operators.
Several different statements grouped into one is called a compound statement . Braces are used to
enclose this type of statement. Compound statements are used if several statements are to be
executed in a situation where Axcess syntax will allow just one. The statements are executed in the
sequence they are programmed.
Special Operators
Operator Name Function
{ } Braces Combine several statements into a function.
[ ] Brackets • Enclose the device-channel: [device, channel].
• Enclose the location of a storage space in an array.
• Enclose the instance number for use with a SYSTEM_CALL.
( ) Parentheses • Enclose the expression after an IF statement.
• Enclose a mutually exclusive set in the Define section.
• Enclose DEFINE_CALL parameter list.
• Group a mathematical operation.