APC Battery Management System - Manual (Page 37)

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USER’S GUIDE
Battery Management System
30
Modbus
Modbus lets you view the Battery Management System through your
building management services interface. It is read-only.
The Modbus interface supports 2-wire RS-485 with the following pin-out:
• Pin 2: TX/RX +
• Pin 3: TX/RX -
• Pin 5: GND
To configure Modbus using the Web interface, do the following:
• Select Modbus from the Battery System menu.
• Enter your settings.
To configure Modbus using the control console, do the following:
• Select Device Manager .
• Select Modbus .
• Enter your settings, including the baud rate at which your Modbus is
operating, either 9600 or 19200.
To use Modbus, do the following:
• Configure the DIP switches for Modbus operation.
See also
To configure the DIP switches, see the Battery Management
System Installation and Quick Start Manual
(
.\doc\en\insguide.pdf ), provided on the APC Battery
Management System Utility CD.
See also
The data that is available through the Modbus interface is defined
in a spreadsheet (
.\doc\en\AP9920_MBRegMap_xx.xls )
provided on the APC Battery Management System Utility CD.