Campbell-scientific CR3000 Micrologger Uživatelský manuál stáhnout pdf (Strana 124)

Section 7. Installation

124

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Table 12. Data Types

Name:

Command

or

Argument

Description /

Word Size

Where Used Notes Resolution / Range

FP2

Campbell

Scientific floating

point /

2 byte

Final data storage

Default final storage data type. Use FP2

for stored data requiring 3 or 4

significant digits. If more significant

digits are needed, use IEEE4 or an offset.

Zero Minimum Maximum

0.000 ±0.001 ±7999.



Absolute Value Decimal Location

0 -- 7.999 X.XXX

8 -- 79.99 XX.XX

80 - 799.9 XXX.X

800 -- 7999. XXXX.

As Float

IEEE Floating

Point /

4 byte

Dim & Public

variables

IEEE Standard 754

±1.4 x 10

-45

to ±3.4 x 10

38

IEEE4

IEEE Floating

Point /

4 byte

Final data storage IEEE Standard 754

±1.4 x 10

-45

to ±3.4 x 10

38

As Long

Signed Integer /

4 byte

Dim & Public

variables

Final data storage

Use to store count data 

±2,147,483,648

Speed -- math with integers is faster

than with Floats.

Resolution -- has 32 bits compared to

24-bits in IEEE4.

Usually not suitable for final data

storage (except counts) since fractional

portion of values is lost.

-2,147,483,648 to +2,147,483,647

UINT2

Unsigned Integer/

2 byte

Final data storage

Use to store positive count data 

+65535.

Use to store port or flag status. See

CRBasic example Load binary

information into a variable (p. 117).

Wh

en Public FLOATs convert to

UINT2 at final data storage, values

outside the range 0-65535 yield

unusable data. INF converts to 65535.

NAN converts to 0.

0 to 65535

UINT4

Unsigned Integer/

4 byte

Final data storage

Use to store positive count data 

2147483647.

Other uses include storage of long ID

numbers (such as are read from a bar

reader), serial numbers, or address.

May also be required for use in some

Modbus devices.

0 to 2147483647

1 2 ... 119 120 121 122 123 124 125 126 127 128 129 ... 589 590

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