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Appendix A: Device List and Device Instance Numbering
The Intelli-Hood 3 System Controller is a scalable device that can control up to 64 VFDs.
The items listed in the Object/Property Support Matrix list the points available from the
Intelli-Hood 3 system at this time. As such, the Intelli-Hood 3 system’s BACnet interface
is implemented as a virtual router. The System Controller is the main Device Object and
the router; each Exhaust Fan, Auxiliary Airflow, Hood Controller, Virtual Output Module
and Virtual Input Module is populated at separate Device Objects behind the router.
From the user’s perspective each Exhaust Fan, for example, will appear to be a separate
physical device on the system. This implementation means that another Exhaust Fan or
Auxiliary Airflow can be added to the system without changing how the previous points
are accessed. By default, the system will auto-number the Device Instance Numbers for
the System Controller, Exhaust Fans, Auxiliary Airflows, Hood Controllers, Virtual Output
Modules and Virtual Input Modules to reduce the number of items that need to be
configured for the system. This section summarizes how the user can determine the
Device Instance Number and the Device Object MAC address for each virtual device
when the System Controller auto-assigns the Device Instance Numbers.
The System Controller Device Object is Device Instance Number defaults to 654000
(Vendor ID x 1000). Each Exhaust Fan, Auxiliary Airflow, Hood Controller, Virtual Output
Module and Virtual Input Module is then numbered after the System Controller in the
following manner:
1.
Exhaust Fans, Auxiliary Airflows, Hood Controllers, Virtual Output Modules and Virtual Input
Modules are numbered immediately after the System Controller. With the default settings, they
will start with Device Instance Number 654001.
2.
Exhaust Fans and Auxiliary Airflows are sorted before being assigned a Device Instance Number.
They are sorted first by its configured name, then by its Modbus address, then by an internal
Universally Unique Identifier (UUID) to ensure a consistent sort order.
3.
Hood Controllers are numbered immediately after the last Exhaust Fan or Auxiliary Airflow.
4.
Hood Controllers are sorted before being assigned a Device Instance Number. They are sorted
first by its configured name, then by its Hood Network address, then by an internal UUID to
ensure a consistent sort order.
5.
Virtual Output Modules are numbered immediately after the Hood Controllers.
6.
Virtual Output Modules are sorted before being assigned a Device Instance Number. They are
sorted first by its configured name, then by its address, then by an internal UUID to ensure a
consistent sort order.
