Campbell-scientific CR3000 Micrologger Instrukcja Użytkownika Pobierz pdf (Strona 125)

100

101

Section 7. Installation

125

Table 12. Data Types

Name:

Command

Argument

Description /

Word Size

Where Used Notes Resolution / Range

As Boolean

BOOLEAN

Signed Integer /

4 byte

Dim & Public

variables

Final data storage

Use to store TRUE or FALSE states,

such as with flags and control ports. 0 is

always false. -1 is always true.

Depending on the application, any other

number may be interpreted as true or

false. See True = -1, False = 0 (p.

150).To save memory, consider using

UINT2 or

BOOL8.

0, -1

BOOL8

Integer /

1 byte

Final data storage

8 bits (0 or 1) of information. Uses less

space than 32-bit BOOLEAN. Holding

the same information in BOOLEAN will

require 256 bits. See Bool8 Data Type

(p. 232).

-1

NSEC

Time Stamp /

8 byte

Final data storage

Divided up as four bytes of seconds

since 1990 and four bytes of

nanoseconds into the second. Used to

record and process time data. See NSEC

Data Type (p. 228).

1 nanosecon

As String

STRING

ASCII String /

word size varies

Dim & Public

variables

Final data storage

Size is defined by the CR3000 operating

system. When converting from

STRING to FLOAT, numerics at the

beginning of a string convert, but

conversion stops when a non-numeric is

encountered. If the string begins with a

non-numeric, the FLOAT will be NAN.

If the string contains multiple numeric

values separated by non-numeric

characters, SplitStr() can be used to

parse out the numeric values. See String

Operations (p. 241) and Serial I

/O (p.

205).

Unless declared ot

herwise, the minimum

string size is 16 bytes or characters. Size

above 16 bytes increases in multiples of

four bytes; for example, String * 18

allocates 20 bytes (19 usable).

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CRBasicExample9. DataTypeDeclarations

'Float Variable Examples

Public Z

Public X As Float

'Long Variable Example

Public CR3000Time As Long

Public PosCounter As Long

Public PosNegCounter As Long

Boolean Variable Examples

Public Switches(8) As Boolean

Public FLAGS(16) As Boolean

'String Variable Example

Public FirstName As String * 16 'allows a string up to 16 characters long

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