Vaisala HMM105 Manuel d'utilisateur télécharger pdf (Page 21)

Chapter 2 _______________________________________________________________ I2C Interface

VAISALA ____________________________________________________________________ 19

Data Registers

The register table describes all available parameters and their properties.

The properties are: parameter meaning, ID, name, data type, length and

persistence. Persistence defines if the parameter is saved in EEPROM

(non-volatile memory) or in RAM. Make sure not to write excessively to

the EEPROM, as it has a maximum lifetime of approximately 30000

cycles.

Data Formats

Table 31 Data Formats

Data type name

Size (Bytes)

Other

Byte

Value range 0...255

Integer

Value range -32768...32767

Unsigned integer

Value range 0…65535

Long integer

Value range

−2,147,483,648…2,147,483,647

Unsigned long integer

Value range 0…4,294,967,295

Float

According to IEEE-754. NaN

(7FC00000) is returned if no value

is available

String

Max. 50

All characters accepted

(00h…FFh)

NOTE

Maximum string size refers to

maximum communication buffer size.

Actual reserved storage space for each parameter can be seen

in Table 32

on page 20

NOTE

Integers and floating point numbers are sent LSB first.

1 2 ... 16 17 18 19 20 21 22 23

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Vaisala HMM105 Manuel d'utilisateur Page 21