Technical Bulletin

BACnet MS/TP—On-Board Communication
PowerXL DG1 Series VFD MN040010EN—May 2014 www.eaton.com 69
BACnet MS/TP—On-Board Communication
BACnet stands for Building Automation and Control
Networks. It is the common name for the communication
standard ISO 16484-5 which defines the methods and the
protocol for cooperating building automation devices to
communicate. Devices can be designed to operate using
BACnet communication protocol as well as utilizing BACnet
protocol to communicate between systems. BACnet is an
internationally accepted protocol for building automation
(such as lightning control, air conditioning and heating
automation) and control over a communications network.
BACnet provides a method by which computer-based control
equipment, from different manufacturers can work together,
or “interoperate”. For this to be achieved, components must
be able to exchange and understand BACnet data messages.
Your G-Max HVAC drive is equipped with BACnet support as
standard.
BACnet MS/TP Specifications
Table 95. BACnet MS/TP Technical Data
BACnet MS/TP Connections
The control board is located inside the control unit of the DG1 Series Drive.
Figure 28. Principal Example Diagram
Item Description
Interface RS-485
Data transfer method RS-485, half-duplex
Transfer cable STP (Shielded Twisted Pair), type Belden
or similar
Connection: Electrical isolation Communication: Functional
Connection: BACnet MS/TP Communication: As described in
ANSI/ASHRAE Standards 135-2004
Connection: Baud rate Communication: 9600, 19200, 38400,
76800, 115200 (supports autobaud
detection)