Adopting a Numbering System for MAC Addresses, Device Instance Numbers, and
Network Numbers
Good network planning requires a well-thought-out numbering scheme for device MAC Addresses, Device Instance Num-
bers (DI), and Network Numbers. We recommend the following scheme, as it reuses the MAC Address and Network Num-
ber in the Device Instance number to make it easier for a network administrator to know where a device is located in the
network. This is shown below.
Description Range Example
BACnet/IP Network Number 0 to 65 534 1
ECLYPSE Controller BACnet/IP Device Instance Numbers: Multiples of 10 000 10 000 to 4 190 000
10 000
20 000
BACnet MS/TP Network Number: ECLYPSE Controller BACnet/IP Device Instance
Number/1000 + 0,1,2,3,4 (for each LAN)
10 to 4190
10
20
30
BACnet MS/TP Device Instance Number = 10 000 to 4 190 256 10 006 where MAC = 6
Table9: Recommended Numbering Scheme for MAC Addresses, Instance Numbers, and Network Numbers
An example of this numbering system is shown below.
Figure101: BACnet MS/TP Numbering System for MAC Addresses, Device Instance Numbers, and Network Numbers
When discovering devices with a supervisor which has the routing option configured, it will discover all BACnet devices connected to all
ECLYPSE Controllers when routing is enabled (see Routing). Make sure to add only the devices connected to the MS/TP port of the specific
ECLYPSE Controller being configured. Using this numbering system will greatly help to identify those devices that should be added to a
given ECLYPSE Controller.
BACnet MS/TP Communication Data Bus Fundamentals
104
nLight ECLYPSE
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