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25EcoBreeze System Installation
Building Management System
The Modbus interface allows the EcoBreeze System to communicate with a building
management system (BMS).
The Modbus connection is available in two locations on the Modbus hub:
• RJ-45 In port
• 3-wire on terminal block
For an RJ-45 connection, wire as follows:
For a direct 3-wire connection, connect to the corresponding contacts on the green terminal
block on the side of the Modbus hub. No connection is necessary to the 0V contact.
Pin 4 D(A)
Pin 5 D(B)
Pin 8 Ground
1MOD
1MOD
D(B)
D(A)
0 V
na3660a
WIRING CONTACTS
FOR DIRECT 3-WIRE
CONNECTION
RJ-45 IN PORT
DDC PANEL
ENCLOSURE