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Installation Guide
Power Monitoring
E31E Series
Gateway
Configuration (cont.)
Z206855-0B
Page 22 of 26
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BACnet Network Management – Important Steps to Avoid Conflicts
BACnet configuration uses two default settings that might need to be changed, depending on the application.
a. Virtual router network ID number. Every logical network segment (IP subnet, MS/TP trunk, etc.) in an entire system must
have a (16-bit) network ID number that is unique from all other BACnet networks in the enterprise. The BACnet network
administrator assigns this network ID so that no two ID numbers conflict (whether using BACnet/IP or MS/TP). Within each
segment, every device is physically identified by the combination of its 8-bit MAC address and the 16-bit network ID number.
To support multiple meter panels (panel 1 and panel 2 are separate) with a single gateway, the E31E creates a virtual BACnet
router that presents multiple BACnet devices using a single (its own) MS/TP MAC address. Each E31E must have its own
(internal) network ID, and it creates a device object for itself and one for each Modbus address discovered.
The factory default network address is 50 (decimal). If that number is already in use in the system, assign a unique address
using the graphical user interface (GUI) on the built-in web server (this requires an ethernet connection to a web browser; see
BACnet/IP Setup section for instructions on changing configuration settings using the GUI). Valid network numbers range from
1 to 65534; if other values are entered, the network number defaults to 5.
b. Device_ID Offset. Every BACnet device must have a BACnet Device_ID number that is unique throughout the entire enterprise.
Since the E31E presents every Modbus meter as a BACnet device, each connected meter that has a Modbus address must have a
BACnet Device_ID.
By default, each device discovered receives a Device_ID number that is the sum of an offset value (default is 50000) and the
Modbus address of the device. If these Device_ID numbers cause a conflict with existing devices in the system, or if the system
includes multiple E31E Series, change the Device_ID numbers before connecting the E31E to the system. This can be managed
one of two ways:
i. Connect to the E31E directly (offline from the system) with the devices (meters). After the E31E discovers the devices
and assigns their default ID numbers, the user can choose new Device_ID values and write these to each device using
BACnet software. Subsequent discoveries will not overwrite these values with defaults even if the E31E is then set to
Discovery mode.
ii. Use the GUI on the built-in web server to modify the offset value used to calculate default Device_IDs in the discovery
process (this requires an ethernet connection to a web browser; see BACnet/IP Setup section for instructions on changing
configuration settings using the GUI). The E31E retains this offset value and uses it to assign Device_ID numbers every time
power is cycled if the E31E is in Discovery mode. Valid Device_ID numbers range from 1 to 4194303. Since the numbers
assigned during discovery are the sum of the Offset and the Modbus address (which can be any value from 1-255), any
Offset values entered in the GUI must be less than 4194055.
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