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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.