Vaisala HMW90 - Manual (Page 101)

Appendix A _________________________________________________________ BACnet Reference
VAISALA ________________________________________________________________________ 99
Operation Altitude Object
User can set current atmospheric pressure to improve the calculation
accuracy of pressure dependant humidity parameters.
Table 35 Operation Altitude Object Parameters
Property Data type Writable Value or Initial Value
Object Identifier BACnet Object Identifier No 00 80 00 02 (hex)
Object Type = 2,
Instance = 2
Object Name Character String No "OPER Altitude"
Object Type BACnet Object Type No 2 (Analog Value)
Present Value Real Yes 0.0
Description Character String No "Operating Altitude"
Units BACnet Engineering Units Yes 31/33 (meters/feet)
Status Flags BACnet Status Flags No 0 (FAULT == FALSE)
Event State BACnet Event State No 0 (NORMAL)
Out of Service BOOLEAN No 0 (FALSE)
Present Value
Two pressure related objects (Pressure and Altitude) are linked together.
If Present Value in object is changed by user, Present Value in another
object is changed accordinly.
Units
Unit can be changed using BACnet. Possible units are meters (31) or
feet (33).
Status Flags
Table 36 Status Flags
Flag State Cause
IN_ALARM FALSE Always FALSE
FAULT FALSE Always FALSE
OVERRIDDEN FALSE Always FALSE
OUT_OF_SERVICE FALSE Always FALSE
Event State
Event State value is always NORMAL.
Out of Service
Out of Service value is not writeable.