Modbus Communications Interface (MODB)
UC800 provides an optional Modbus Communication Interface (MODB) between the unit and a Building
Automation System (BAS). This communication is conducted by the RS-485 connection with RTU protocol.
BACnet Communications Interface (BCI-C)
UC800 provides an optional BACnet Communications Interface (BCI-C) between the unit and a Building
Automation System (BAS).
See Trane wiring diagrams for details.
Master-Slave unit wiring connection
(RTXC XE310/330/360/400/440 units)
RTXC XE units have installed the modules of unit status. The Master-Slave unit operation is conducted by
the wired connection among Unit Running/Stop Output module 1A26, External Auto/Stop module 1A14 and
Heating/Cooling Mode Setting module 1A19.
Connect the 1A26-J2-6 of Master unit to 1A19-J2-3 of Slave unit.
Connect the 1A26-J2-4 of Master unit to 1A19-J2-4 of Slave unit.
Connect the 1A26-J2-3 of Master unit to 1A14-J2-1 of Slave unit.
Connect the 1A26-J2-1 of Master unit to 1A14-J2-2 of Slave unit.
See Wiring Schematics for the specific wiring diagrams.
Master-Slave unit setpoints notes:
1) Configure the same chilled/hot water setpoint for both Master and Slave units.
2) Set the Slave unit as Auto and Cooling mode.
Important: When set the Master unit as Auto mode, the Slave unit still can operate independently.
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