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.
