Using installer settings   
 
 
 
 
Carrier Connect™ Wi-Fi Thermostat 33CONNECTSTAT43FX    CARRIER CORPORATION ©2021  
Installation Guide    All rights reserved 
  40 
 
To set up BACnet 
 
BACNET ENABLE—Enable or disable the BACnet communications. After restoring factory 
defaults, the user is prompted to decide whether or not to enable BACnet. Until this 
choice is made, the installer menu loads after every restart and the installer menu goes 
directly to the BACNET ENABLE setting where ? is displayed.  
NOTE  Changing the BACNET ENABLE requires the thermostat to be restarted.  When the 
installer exits the configuration settings after making changes to the BACnet settings, 
there is a prompt to either cancel those settings or save the new settings which force a 
thermostat reset. 
NO (disabled) 
YES (enabled) 
NO (disabled) 
MSTP MAX MASTER—Set the maximum MAC address for BACnet MS/TP master devices. 
BACnet MS/TP MAC addresses for master devices exist in the range from 0 to 127. Each 
BACnet MS/TP device periodically looks for other devices (sends Poll for Master 
message) with addresses from its own address, plus one, to the next known address 
(wrapping to 0 after 127).  
Performance gains can be made on a BACnet MS/TP network by not leaving any gaps in 
MAC address and setting the MS/TP Max Master parameter of the device with the 
highest MAC address to a value equal to its MAC address. The downside to setting the 
MS/TP Max Master to a value less than 127 is, if new devices are added to the network 
with addresses above the Max Master value, they won’t be discovered or added to the 
network. 
NOTES 
•  Changing the MS/TP Max Master requires restarting the thermostat. When the 
installer exits the configuration settings after making changes to the BACnet 
settings, there is a prompt to either cancel those settings or save the new settings, 
which forces a thermostat reset 
•  The Max Master parameter should be set to a value equal to or greater than the 
MS/TP MAC Address.  
This setting is not displayed if BACnet is disabled 
MSTP BAUD RATE—Set the baud rate for the BACnet MS/TP communications to one of 
the following values: 9600, 19.2K (19200), 38.4K (38400), 76.8K (76800) or 115k 
(115200). The BACnet MS/TP baud rate must be set to match the other devices on the 
BACnet MS/TP network. 
NOTE  Changing the MS/TP baud rate requires restarting the thermostat. When the 
installer exits the configuration settings after making changes to the BACnet settings, 
there is a prompt to either cancel those settings or save the new setting, which forces a 
thermostat reset. 
This setting is not be displayed if BACnet is disabled. 
76.8K 
9600 
19.2K (19200) 
38.4K (38400) 
76.8K (76800) 
115k (115200).