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Honeywell 301C User Manual
420MDBS_IR-F9
93
Property
Data Type
Required
1
Storage
Type
2
BACnet
Writeable?
Value
object_identifier
R C
N
Modbus address * 256 + 1. For example an
420MDBS at Modbus address 002 will
appear as 513 or 0x0201.
object_type enumerated
R C N
analog_input (0)
event_state enumerated R R N
if gas sensor fault Fault (1),
else normal (0)
object_name character string
R
N N
"420MDBS GGGG AdXXX.GGGG" where
GGGG is the gas name and XXX is the
Modbus address. Values for gas name
include "NH3".
out_of_service boolean R R N FALSE
present_value
real R R N Gas reading
analog_in
gas
reliability enumerated O R N
As appropriate reports
no_fault_detected (0) or
unreliable other (7)
status_flags
in_alarm boolean R R N
if alarm or fault "true" (1)
else "false" (0)
fault boolean R R N
if faulty "true" (1)
else "false" (0)
overridden boolean R R N "false" (0)
out_of_service
boolean R R N "false" (0)
units
enumerated R N N
Depends on configuration of 420MDBS
factory configuration or 301C configuration,
usually ppm (96)
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.
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