Filter
Top Products
Honeywell 301C User Manual
XNX and XCD continued
Group
Property Data Type
Required
1
Storage
Type
2
BACnet
Writeable?
Value
object_identifier R N N
Modbus address * 256 + 2. For example an
XNX at Modbus address 010 will appear as
2562 or 0x0A02.
object_type enumerated R C N
analog_value (2)
event_state
enumerated R C N
normal (0)
object_name character string R N N
"SSS GGGG AdAAA.AlarmA" where SSS is
the sensor type, GGGG is the gas name and
AAA is the Modbus address. Values for gas
name include "CO" and "COMB". Gas
names are truncated to 4 characters.
Values for sensor type are "XNX" or "XCD"
For example, an XNX at address 10 with a
Methane sensor will populate this object
name with "XNX Meth Ad010.AlarmA"
out_of_service boolean R C N
FALSE
present_value real R N N
Alarm1 threshold copied from sensor
through the 301C. This may only be
modified on the sensor.
reliability enumerated O C N
always false (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
96 (ppm) or
98 (percent) or
95 (no_units)
object_identifier R N N
Modbus address * 256 + 4. For example an
XCD at Modbus address 011 will appear as
2820 or 0x0B04.
object_type enumerated R C N
analog_value (2)
event_state
enumerated
R C N
normal (0)
object_name
character string R N
N
"SSS GGGG AdAAA.AlarmB" where SSS is
the sensor type, GGGG is the gas name and
AAA is the Modbus address. Gas names
are truncated to 4 characters. Values for
sensor type are "XNX" or "XCD" For
example, an XCD at address 11 with an H2S
sensor will populate this object name with
"XCD H2S Ad011.AlarmB"
out_of_service boolean R C N
FALSE
present_value real R N N
Alarm2 threshold copied from sensor
through the 301C. This may only be
modified on the sensor.
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
96 (ppm) or
98 (percent) or
95 (no_units)
Analog Values
AlarmA
AlarmB
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
87