Honeywell 301C User Manual
Honeywell 301C User Manual
Property
Data Type
Required
1
Storage
Type
2
BACnet
Writeable?
Value
object_identifier
R
N
N
Modbus address * 256 + 4. For example an
420MDBS at Modbus address 002 will
appear as 516 or 0x0204.
420MDBS at Modbus address 002 will
appear as 516 or 0x0204.
object_type
enumerated
R
C
N
analog_value (2)
event_state
enumerated
R
C
N
normal (0)
object_name
character string
R
N
N
"420MDBS GGGG AdXXX .Amin" where
GGGG is the gas name and XXX is the
Modbus address. Values for gas name
include "NH3".
GGGG is the gas name and XXX is the
Modbus address. Values for gas name
include "NH3".
out_of_service
boolean
R
C
N
FALSE
present_value
real
R
N
Y
Gas threshold from 301C. Synchronization
is maintained with the 301C and the
420MDBS. Whichever value is written last
is distributed to the other two locations.
is maintained with the 301C and the
420MDBS. Whichever value is written last
is distributed to the other two locations.
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
Depends on configuration of 420MDBS
factory configuration or 301C configuration,
usually ppm (96)
factory configuration or 301C configuration,
usually ppm (96)
object_identifier
R
N
N
Modbus address * 256 + 5. For example an
420MDBS at Modbus address 002 will
appear as 517 or 0x0205.
420MDBS at Modbus address 002 will
appear as 517 or 0x0205.
object_type
enumerated
R
C
N
analog_value (2)
event_state
enumerated
R
C
N
normal (0)
object_name
character string
R
N
N
"420MDBS GGGG AdXXX .Amin" where
GGGG is the gas name and XXX is the
Modbus address. Values for gas name
include "NH3".
GGGG is the gas name and XXX is the
Modbus address. Values for gas name
include "NH3".
out_of_service
boolean
R
C
N
FALSE
present_value
real
R
N
Y
Gas threshold from 301C. Synchronization
is maintained with the 301C and the
420MDBS. Whichever value is written last
is distributed to the other two locations.
is maintained with the 301C and the
420MDBS. Whichever value is written last
is distributed to the other two locations.
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
Depends on configuration of 420MDBS
factory configuration or 301C configuration,
usually ppm (96)
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.
'R' indicate the property is computed constantly and stored in RAM.
Group
An
al
og
V
al
ue
s
Bm
in
Bm
ax
95