Chapter 6 Network Wiring
170 BMTW-SVN01F-EN
Special Situations
There are several special situations that require additional configuration.
These are highlighted below.
Multiple Sites on a Single Shared Network
On a larger installation, many buildings may exist on a shared network.
In this case, you will typically program each building as its own site. This
can be easily accommodated. Follow these rules:
• Each BCU and PC Workstation on a site will require a unique device
ID. However, the device IDs may be re-used on other sites on the IP
network.
• Each BBMD in a site will require a copy of the BDT for the site. The
site BDT lists only the BBMDs for that site.
• In the rare instance of having more than one site on an IP subnet(s),
each site should use a unique UDP port number.
• Sites will send alarms into the PC Workstation’s event log regardless
of whether they are open or not.
• Selecting a site from the tree will automatically select and open that
site.
BACnet/IP Routers
Installations with BCUs (BMTS) or other BACnet devices that are not IP
capable will require the installation of a BACnet/IP router. Contact Trane
for more information on these routers. Follow these rules regarding
routers:
• The BACnet devices on each side of the BACnet/IP router (the dedi-
cated-network side and the shared-network side) require unique
BACnet network numbers. Additionally, all dedicated-network
BACnet devices must have the same BACnet network number and all
shared-network BACnet devices must have the same BACnet net-
work number. These numbers can be set up in site configuration.
• The router(s) will require IP configuration.
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