Vaisala HMM105 - Manual (Page 3)

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VAISALA _____________________________________________________________________ 1
Table of Contents
CHAPTER 1
GENERAL INFORMATION ............................................................................ 2
About This Manual ................................................................... 2
Version Information ................................................................. 2
Related Manuals ....................................................................... 2
CHAPTER 2
I 2 C INTERFACE ............................................................................................. 3
Overview ................................................................................... 3
Physical Interface .................................................................. 3
Communication Parameters .................................................. 4
Addressing ............................................................................ 4
Communication Flow ............................................................... 5
HMM105 State Machine ........................................................ 6
Examples of Communication Flow ........................................ 7
Timing .................................................................................... 9
Status Byte ............................................................................ 9
Checksum ............................................................................. 9
Status Word......................................................................... 10
Commands .............................................................................. 11
Get_Interface_Version ........................................................ 11
Get_Parameter .................................................................... 12
Example: Read RH Measurement Result ...................... 13
Set_Parameter .................................................................... 14
Example: Set Compensation Pressure .......................... 15
Get_Parameter_Info ............................................................ 16
Adjust .................................................................................. 17
Adjusting Measurement......................................................... 18
One Point Adjustment ......................................................... 18
Two Point Adjustment ......................................................... 18
Data Registers ........................................................................ 19
Data Formats .......................................................................... 19
Register Table ..................................................................... 20