Veris Industries E34 Series Installation Manual page 31

E34 Series Installation Guide
Gateway Configuration
(cont.)
Z207251-0C Page 31 of 42
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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 E34E creates a virtual BACnet
router that presents multiple BACnet devices using a single (its own) MS/TP MAC address. Each E34E 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 E34E 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 E34 Series, change the Device_ID numbers before connecting the E34E to the system. This can be managed
one of two ways:
i. Connect to the E34E directly (offline from the system) with the devices (meters). After the E34E 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 E34E 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 E34E retains this offset value and uses it to assign Device_ID numbers every
time power is cycled if the E34E 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 to
247), any Offset values entered in the GUI must be less than 4194057.
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