Campbell Scientific CR9000X Measurement and Control System - Manual (Page 401)

Section 11. String Functions
Parameter
& Data Type Enter INSTR PARAMETERS
Start
Integer Integer that specifies where in the SearchString to start looking for the
FilterString. A 1 Specifies the first character in the string
SearchStr
String or Var The string to evaluate for the FilterString.
FilterString
String String to look for in the SearchString. For a FilterString using non-printable
ASCII characters, use the CHR function and the appropriate ASCII code
SearchOpt The SearchOption is a code used to help define the method of searching:.
Constan 0 NUMERIC - Numerics in the SearchString are returned (FilterString is
Ignored)
1 NON-NUMERIC - Non-numerics are returned (FilterString is ignored)
2 SEARCHSTRING - Each FilterString in SearchString
3 SEARCHCHARS - Each occurrence of any character in FilterString
4 HEADERFILTER - Strings succeeding FilterString are returned.
6 HEADERFILTERCHARS - Strings succeeding any character in the
FilterString char list are returned.
8 NUMERICHEX - Hexadecimal numerics in the SearchString are
returned (FilterString is ignored)
Left (SearchString, NumChars)
The Left function returns a substring that is a defined number of characters
from the left side of the original string.
Syntax
String = Left( SearchString, NumChars )
Parameter
& Data Type Enter LEFT PARAMETERS
String
String or Var The string from which the Sub-string will be retrieved..
NumChars
Variable or
constant The NumChars parameter is used to specify the number of characters from
the left side of the string to return.
.
Len (SourceString)
The Len function is used to return the number of bytes in a string.
Syntax
Variable = Len( SourceString )
Remarks
The SourceString must be declared as a variable. When defining the
SourceString variable, its size must be set large enough to accommodate the
expected string. Otherwise, the result returned by the Len function will be the
maximum size of the string, even if the actual string is larger (strings are null-
terminated; note that the null termination character counts as one of the
characters in the string). If a size is not specified when the SourceString
variable is defined, the default string size is 16.
11-5