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-- Greater than or Equal to
-- Less than or Equal to
-- Equal
-- Unequal
- Legal values include:
Syntax for Complex Expressions
Refer to the same section under Filter Formulas Syntax.
Elements of Threshold Formulas
Parameters
Example
Variable
R
H
M
S
Relation
>
<
>=
<=
==
!=
Value
256
19990229
135501
Logical_Operator
AND
OR
Example: Threshold Formulas
Some possible threshold formulas include:
•
•
•
In the last formula, an event is triggered if (the data is changing at the rate greater than 100 per
second) or (the value is less than 10,000).
A formula follows this basic syntax:
(Variable Relation Value) Logical_Operator (Variable Relation Value)
-- An unsigned integer, 0 ~ 4 bytes long.
Description
Actual value of the data
Data rate per hour
Data rate per minute
Data rate per second
Greater than
Less than
Greater than or equal to
Less than or equal to
Equal
Not equal
Positive number (4 byte unsigned integer)
Date format (YYYYMMDD) for 2 Feb 1999
Time format (HHMMSS) for 1:55:01pm
Both statements must be true
Either statement may be true
C
D
OLLECTING
ATA WITH
L
M
OG
ANAGER
7-11
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