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Honeywell 301C User Manual
Objects for 301EM
Group
Property Data Type
Required
1
Storage
Type
2
BACnet
Writeable?
Value
object_identifier
R C N
TxNumber * 256 + 1. The TxNumber is the
Modbus address plus the sensor number in
the 301EM. For example, sensor 2 on a
301EM at Modbus address 030 will appear
as 7937 or 0x1F01.
object_type enumerated
R C N
analog_input (0)
event_state
enumerated R R
N
not meaningful
object_name character string R N
N
"VA301EM
GGGG Ad
XXX.
GGGG" where
GGGG is the gas name and
XXX is the
Modbus address. Values for gas name
include "R11" and "NH3".
out_of_service boolean R
R N
FALSE
present_value real R
R N
Gas reading
reliability enumerated O
R N
As appropriate reports
no_fault_detected (0),
no_sensor (1), or
unreliable other (7)
Fault is detected within 60 seconds
status_flags
in_alarm boolean
R
R N
not meaningful
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
From 301EM, usually ppm (96)
object_identifier
R N N
For Amin, TxNumber * 256 + 2,
For Amax, TxNumber * 256 + 3,
For Bmin, TxNumber * 256 + 4,
For Bmax, TxNumber * 256 + 5,
For Cmin, TxNumber * 256 + 6,
For Cmax, TxNumber * 256 + 7
The TxNumber is the Modbus address plus
the sensor number in the 301EM.
object_type
enumerated R C N
analog_value (2)
event_state
enumerated R C N
not meaningful.
object_name character string
R N N
"VA301EM GGGG AdXXX.LLLL" where GGGG
is the gas name, XXX is the
Modbus address plus the sensor number in
the 301EM and LLLL is a member of the set
{Amin, Amax, Bmin, Bmax, Cmin and
Cmax}.
out_of_service boolean R
C N
FALSE
present_value
real R N N
Writing alarm thresholds over BACnet not
supported.
reliability enumerated O C N
not meaningful.
status_flags
in_alarm boolean R C N
not meaningful.
fault boolean R C N
not meaningful.
overridden boolean R C
N
always false (0)
out_of_service boolean R C
N
always false (0)
units enumerated R
C N
ppm (96) or % (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.
Gas (One instance per sensor on the 301EM.)
analog_input
Analog Values (six instances for each sensor on the 301EM, up to 120).
Amin, Amax, Bmin, Bmax, Cmin, Cm
88