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Honeywell 301C User Manual
XNX and XCD
Group Property Data Type
Required
1
Storage
Type
2
BACnet
Writeable?
Value
object_identifier R C N
Modbus address * 256 + 1. For example an
XNX at Modbus address 010 will appear as
2561 or 0x0A01.
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
"SSS GGGG AdAAA.GGGGG" where SSS is
the sensor type, GGGG is the gas name and
AAA is the Modbus address. Gas names are
truncated to 4 and 5 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.Metha"
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) or
unreliable other (7)
Fault is detected within 60 seconds
status_flags
in_alarm boolean R R N
if faulty "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
96 (ppm) or
98 (percent) or
95 (no_units)
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…
analog_input
gas
86