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Installation Guide
Air Quality
BACnet Descriptions (cont.)
Z207135-0C
Page 8 of 10
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Objects Table
Object Name
SENSOR
LIFETIME
RUNTIME
Device_Instance
Identifier_Value_Prefix
High_Set-point
High_Hysteresis
Low_Set-point
Low_Hysteresis
High_Set_point_Exceeded
Low_Set_point_Exceeded
Device_Object_Reset
High_Relay_Override
High_Relay_Level
Low_Relay_Override
Low_Relay_Level
Lock_Settings
Device Objects Table
Object Name
Object Identifier
GWNxxxx
Device 133nnn
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Type and
Instance
Present_Value Property
AI 1
Gas concentration of sensor.
AI 2
Remaining hours until sensor replacement.
AI 3
Hours of runtime for sensor.
AV 1
Alternative way to change object_identifier property of device. Fractional
values are truncated.
AV 2
Initially 133, this is the value is prepended to the MAC address in the device
object identifier value.
AV 3
High set-point value. Originally sensor high set-point.
AV 4
High hysteresis value. Originally sensor high set-point hysteresis.
AV 5
Low set-point value. Originally sensor low set-point.
AV 6
Low hysteresis value. Originally sensor low set-point hysteresis.
BI 1
Becomes ACTIVE when AI 1 ≥ AV 3; becomes INACTIVE when
AI 1 ≤ (AV 3 - AV 4).
BI 2
Becomes ACTIVE when AI 1 ≥ AV 5; becomes INACTIVE when
AI 1 ≤ (AV 5 - AV 6).
BV 1
Always reads INACTIVE. Write ACTIVE to reset the Device Objects Object_
Name and Object_Identifier to their defaults.
BV 2
ACTIVE means BV 3 controls relay, otherwise BI 1 controls the relay.
BV 3
When BV 2 is ACTIVE, an ACTIVE BV 3 behaves like the set-point has been
exceeded.
BV 4
ACTIVE means BV 5 controls relay, otherwise BI 2 controls the relay.
BV 5
When BV 4 is ACTIVE, an ACTIVE BV 5 behaves like the set-point has been
exceeded.
BV 6
When BV 6 is ACTIVE, DIP switches are disabled, and register values control
the settings. When BV 6 is INACTIVE, the DIP switches control.
Object Property
Object_Identifier (R/W)
Object_Name (R/W)
APDU_Timeout
Max_Master
Description
Location
Description of
Description
Unique value where nnn initially is MS/TP
address. GWN is the product name.
Unique name, initially a combination of model
and serial number. Maximum length is 64
characters.
Default is 3000, maximum value is 60000.
Default is 127
Maximum length is 64 characters
Maximum length is 31 characters
TM
0916
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