APC IN ROW RD ACRD101 Specifications download pdf (Page 40)

InRow Air Cooled RD Installation32

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 allow wiring to be attached. See “User interface connections” on page 28 for specific layout

of the user interface.

For information on setup of Modbus parameters, see the InRow RD Operation manual.

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Termination resistor (provided)

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Modbus cable (RS-485)

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InRow RD # 1 InRow RD # 2 Final InRow RD

Modbus master

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 46 47 48

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APC IN ROW RD ACRD101 Specifications Page 40