Campbell Scientific PC400 Datalogger Support Software - Manual (Page 191)

Section 9. Datalogger Program Creation with CRBasic Editor
9.4.12 Flags
Any variable can be used as a flag as far as logical tests in CRBasic are
concerned. If the value of the variable is non-zero the flag is high. If the value
of the variable is 0 the flag is low. LoggerNet, PC400, or RTDAQ looks for
the variable array with the name Flag when the option to display flag status is
selected from the Connect Screen. If a Flag array is found, as many elements
of that array which can fit will be displayed in the Port and Flags dialog box.
9.4.13 Parameter Types
Instruction parameters allow different types of inputs. These types are listed
below and specifically identified in the description of the parameter in the
following sections or in CRBasic help.
Constant
Variable
Variable
or Array
Constant, Variable, or Expression
Constant, Variable, Array, or Expression
Name
Name or list of Names
Variable, or Expression
Variable, Array, or Expression
TABLE 9-4 lists the maximum length and allowed characters for the names for
Variables, Arrays, Constants, etc.
TABLE 9-4. Rules for Names
Name for Maximum Length
(number of characters)
Allowed characters
Variable or Array 39 (17 )
Constant 39 (16)
Alias 39 (17 )
Data Table Name 20 (8)
Field name 39 (16)
Letters A-Z, upper or
lower case, underscore
“_”, and numbers
0-12. The name must
start with a letter.
CRBasic is not case
sensitive.
Values in parentheses refer to the CR5000, CR9000 and CR9000X dataloggers.
9.4.13.1 Expressions in Parameters
Many parameters allow the entry of expressions. If an expression is a
comparison, it will return -1 if the comparison is true and 0 if it is false. An
example of the use of this is in the DataTable instruction where the trigger
condition can be entered as an expression. Suppose the variable TC(1) is a
thermocouple temperature:
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