APC ACRD200 Spécifications Page 36

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InRow Fluid Cooled RD Installation28
Building Management System (BMS)
The Modbus interface allows each InRow RD to communicate with the BMS. Use a three-wire cable to
connect each InRow RD in turn. Wire a 150-Ohm, 1/4-W terminator resistor (included) into the Modbus
master and the final InRow RD between Modbus D0 and Modbus D1.
Each InRow RD has a three-wire Modbus terminal on the user interface. Use a connector with screw
terminals to attach wiring. See “User interface connections” on page 24 for a diagram of the user
interface.
For information on setup of Modbus parameters, see the InRow RD Operation manual.
Termination resistor (provided)
Modbus cable (RS-485)
na2678a
InRow RD #1 InRow RD #2 Final InRow RD
Modbus master
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