APC ACRD200 Specifications download pdf (Page 36)

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.

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Termination resistor (provided)



Modbus cable (RS-485)

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InRow RD #1 InRow RD #2 Final InRow RD

Modbus master

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 42 43 44

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APC ACRD200 Specifications Page 36