Toshiba Carrier BMS-IFBN1281U-UL Service Manual page 112

BN interface
NOTE
Before executing air-conditioning search mode, be sure to turn off the power to Touch Screen Controller.
If there is a communication collision on Uh Line between the Touch Screen Controller and BN interface, the indoor units cannot
be properly communicated with, and a setting file cannot be created.
(7) Repeat the above procedures (4), (5), and (6) for the second BN interface.
(8) After completing all of the procedures to set up the BN interfaces, power on the Touch Screen Controller.
NOTE
As the Uh line main bus master controller, the Touch Screen Controller performs regular communication with the indoor units
to acquire their operation status.
The "LINK(Uh)" LED (orange) does not blink because the BN interface has stopped communicating with the indoor unit as a
result of being set for combination use.
When the power to the Touch Screen Controller is interrupted, the BACnet system is also affected. This will result in a
communication error with the indoor units.
NOTE
Whenever the following changes are made, the process described at step (6) (above) needs to be repeated.
• The central control address, Line address, or unit address of the indoor units is changed;
• The address of an individual or the base unit of the indoor remote control group is changed (line address, unit address);
• An indoor remote control group is added or removed;
• The display setting for the remote control for the indoor units (individual units, base unit) is changed.
• Operation mode
• Upper/lower limit for the temperature setting
• Availability of the ventilation function
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Service Manual