7.16
SEL-2032 Communications Processor Instruction Manual Date Code 20120126
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Decode Equations
A Decode Equation consists of one or more Decode Expressions as shown in
Equation 7.1.
Equation 7.1
Use braces, { }, to enclose a group of expressions together. This is especially
useful when parsing tabular data. The following string is an example of a
Decode Equation.
In this example, the SEL-2032 expects four rows of data with each row
containing an integer, string of 5 characters, an integer, and a floating-point
value. At the end of each row is a carriage return.
A Decode Expression consists of one or more Decode Elements or a Search
String as shown below.
DExp = DElem
D Exp = (DElem
1
, DElem
2
, …, DElem
n
)
D Exp = Search String
Use parentheses, ( ), to enclose a logical group of Decode Elements, and
commas to separate the Decode Elements within a logical group. The
following string shows an example Decode Expression with three Decode
Elements.
I, 3F, S20
This example specifies one integer, an array of three floating-point numbers,
and a string of 20 characters.
Decode Elements. A Decode Element consists of a Data Type (Type) and
optional parameters as shown below.
DElem = [r]Type[n][@|;label]
These optional parameters are shown below in brackets but the brackets are
not actually entered. The Data Type and optional parameters are defined in
Table 7.3.
An example of a Decode Element is: 2F5;My_Float. This example shows an
array of two floating-point numbers, each with a maximum of 5 ASCII
characters. The data are stored in the SEL-2032 database with the My_Float
label.
Decode Elements also have user-defined reset values. It may be desirable to
have user-defined reset values for failed parsing conditions. Specify the
numerical reset values in the Decode Equation. After defining a reset value,
any subsequent data items that fail to parse are reset to the new reset value.
The Decode Equation shown in Equation 7.2, resets the database with the
following reset values if the SEL-2032 fails to parse the incoming data.
F = 78F0 0000h (default reset value defined in table 3.6)
H = 8000h (default reset value defined in table 3.6)
I = 8000h (default reset value defined in table 3.6)
F = 3.55 (reset value defined with RF3.55)
DEq = DExp
1
DExp
2
. . . DExp
n
Courtesy of NationalSwitchgear.com
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