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Honeywell 301C User Manual
IAQPoint2 continued
79
Data Type
Required
1
Storage
Type
2
BACnet
Writeable?
Value
object_identifier
R N N
Modbus address * 256 + 2. For example an
IAQPoint2 at Modbus address 005 will
appear as 1282 or 0x0502.
object_type enumerated
R C N
analog_value (2)
event_state
enumerated R C N normal (0)
object_name character string R N N
IAQPoint CO2 AdXXX.Amin" where XXX is
the Modbus address.
out_of_service
boolean R C N
FALSE
present_value
real R N Y
Gas threshold less hysterisis. This is copied
from the sensor via the 301C. BACnet
permits writing. But this has no effect and
the value reverts in a few seconds.
reliability enumerated O C N no_fault_detected (0)
status_flags
in_alarm boolean R C N always false (0)
fault
boolean R C N always false (0)
overridden
boolean R C N always false (0)
out_of_service
boolean R C N always false (0)
units enumerated R C N
if CO2 fitted, ppm (96)
if VOC fitted, % (98)
object_identifier R N N
Modbus address * 256 + 3. For example an
IAQPoint2 at Modbus address 005 will
appear as 1283 or 0x0503.
object_type enumerated R C N analog_value (2)
event_state
enumerated R C N normal (0)
object_name character string R N N
IAQPoint CO2 AdXXX.Amax" where XXX is
the Modbus address.
out_of_service boolean R C N FALSE
present_value
real R N Y
Gas threshold. This is copied from the
sensor via the 301C. BACnet permits
writing. But this has no effect and the
value reverts in a few seconds.
reliability enumerated O C N no_fault_detected (0)
status_flags
in_alarm boolean R C N always false (0)
fault
boolean R C N always false (0)
overridden
boolean R C N always false (0)
out_of_service
boolean R C N
always false (0)
units enumerated R C N
if CO2 fitted, ppm (96)
if VOC fitted, % (98)
Notes
1 -- 'R' indicates that this property is required by ASHRAE Standard 135
'O' indicates that the property is optional in ASHRAE Standard 135
2 -- 'C' indicates the property is hard-coded as a constant
'N' indicates the property is stored in non-volatile memory
'R' indicate the property is computed constantly and stored in RAM.
continued…
Group Property
Analog Values
Amin
Amax