36 Network Guide
Figure 21: Setting the Max Info Frames on the Data Bus Master (EC-BOS)
Default Device Instance Number Numbering System for Distech Controls' con-
trollers
By default, controllers from Distech Controls automatically self-assign a Device Instance num-
ber generated from the unique MAC Address assigned to the controller during installation. The
Device Instance number is calculated as follows:
Device Instance number = 364 X 1000 + MAC Address
Where 364 is Distech Controls unique BACnet Manufacturer ID.
This Numbering system is sufficient for a BACnet network that has only one Building Control-
ler. For larger BACnet networks that have more than one Building Controller (to form a BACnet
intranetwork), set the MAC Addresses, Device Instance Numbers and Network Numbers
according to the numbering scheme below.
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 Numbers (DI), and Network Numbers. We recommend the follow-
ing scheme, as it reuses the MAC Address and Network Number in the Device Instance num-
ber to make it easier for a network administrator to know where a device is located in the
network. This is shown below.
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