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16. BACnet
®
16.1. M3 Unit Controller BACnet
®
Module
The optional M3 unit controller BACnet Module allows communication between the M3 unit controller and a BACnet
MSTP network. The BACnet module conforms to the BACnet application specific controller (B-ASC) device profile. A
Lennox non-communicating room sensor, a BACnet network room sensor, or a BACnet thermostat may be used to send
the room temperature or thermostat demands to the M3.
NOTE: A qualified systems integrator with adequate training and experience is required to integrate and commission the
M3 unit controller BACnet into a third-party BACnet Building Automation System. A BACnet network configuration
software tool is required to commission the BACnet network.
Refer to the Installation Instructions for the M3 unit controller BACnet Module for installation. Refer to the Service
Literature for the M3 unit controller BACnet Module for data point and programming information.
Once the BACnet module is physically installed.
Go to SETUP / INSTALL > Configuration ID 1, position 5, needs to be set to B for enabling the module.
M3 UNIT CONTROLLER SYSBUS NETWORK
CONNECTION
BACnet TRANSMIT & RECEIVE
LEDS
Figure 20. M3 Unit Controller BACnet Module
16.2. Recommendations
1. Set all BACnet devices on an MS/TP network to consecutive MAC addresses, starting at 1, so that there are no gaps
between MAC address values.
2. Set Max_Master device property on all devices to match the largest MAC address on the network. Note, this could
be larger than existing network to allow for adding devices to the network with out the need to adjust the Max_Master
property.
3. Use ReadPropertyMultiple service instead of ReadProperty service when reading multiple analog inputs or values
16.3. Default Settings
device Max_Master = 127
device Max_Info_Frames = 1
device Object_Identifier = MAC address
device Object_Name = “Lennox_M3" + MAC address
device Location = “US"
device Description = “Lennox HVAC Controller"
baud rate = 38.4k
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