The Network Number makes up part of a BACnet Address.
- Value from 1 to 0xFFFE. (Specification 220.127.116.11, pg 51)
- Shall be unique across a given BACnet Internetwork.
- The Network Number of any given BACnet Network is defined by a BACnet Router. No BACnet Router -> No Network Number on your BACnet Internetwork
- It is possible to have multiple IP subnets with the same BACnet Network Number.
- A BACnet Device is uniquely addressed via a BACnet Address or NSAP which consists of a Network Number and a MAC Layer Address
- A Network Number of 0 is often used to indicate 'local network' to a device. It is not valid to see this number in a BACnet NPCI.
The use of 0 as a Network Number to indicate 'local' or 'directly attached' network is common. However, a Network Number of 0 cannot be routed over BACnet Networks. Furthermore, for devices with more than one BACnet Interface, both having a Network Number of 0 would be contradictory. This usage is therefore never recommended.
|APDU BBMD BVLC BVLL DADR DNET Encoding I-Am LSAP MAC NPCI NPDU NSAP NSDU SA SADR SNET|
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