BB2-7030 User Guide – Rev. 1.0
Page 7
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Network numbers MUST NOT be duplicated anywhere else on the network. Duplicated
network numbers on two or more routers will result in erratic operation of the network that can
be difficult to diagnose. Duplicated network numbers means two physically disconnected
networks have been assigned the same network number.
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The IP and MS/TP network numbers MUST be different.
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Two routers connected to the same physical network segment or link MUST use exactly the
same network numbers to refer to that segment of the network. Using two different network
numbers to refer to the same physical network will result in erratic behavior that is difficult to
diagnose. Using the same network number in two routers does not constitute a duplicated
network number, provided those identically numbered ports are physically electrically connected
to each other if MS/TP, or physically connected via a local switch or hub if IP.
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IP networks connected by BB2-7030’s that are connected to each other via a WAN router
MUST be given different network numbers – they are considered physically independent
networks.
If your requirement is simply connecting MS/TP devices to a BACnet IP network, the only
configuration you need to do is contained within the two screens shown above. If there are no
other networks and no other routers involved, you may pick any two arbitrary numbers you like
for network numbers.
The last item that should be configured on the above page is Hop Count. If you are only
connecting MS/TP to BACnet IP locally, set that count to at most 2 since you will not need to
make any additional router hops. If there are additional routers in your system, the hop count
needs to be the maximum number of routers that a message must hop to reach the final
destination. The hop count is decremented once each time it is forwarded.
