User Guide

32 BACnet General Honeywell
9. General Info
Instead of sending and receiving information to and from frequency converters through I/O,
you can connect them to a fieldbus.
Honeywell NX frequency converters can be connected to the RS-485 bus using a fieldbus CJ
option board. The converter can then be controlled, monitored and programmed from the
host system.
BACnet is also known by names Direct Digital Control Systems and Building Management
Systems. BACnet technology is used mostly in building automation, lightning control, air
conditioning and in heating automation. The protocol is an upper level net protocol suitable
for large building automation projects.
BACnet stands for Building Automation and Control Network. BACnet is a true non-
propriatery open protocol communication standard conceived by a consortium of building
management, system users and manufacturers.
If you purchase your BACnet CJ option board separately, please note that it shall be installed
in slot E on the control CJ option board of the frequency converter.
WARNING!
Internal components and circuit boards are at high potential when the
frequency converter is connected to the power source. This voltage is
extremely dangerous and may cause death or severe injury if you
come into contact with it.