CBXi IP Controller |
BACnet Networking
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PIC STATEMENT
Every
BACnet
device is required to have a "protocol implementation conformance statement“ (
PICS
). A
PICS
is a
BACnet
specification sheet, containing a list of a device's
BACnet
capabilities.
It contains:
•
a general product description
•
details of a product's
BACnet
capabilities
•
which
LAN
options are available
•
a few other items relating to character sets and special functionality
The
PICS
is the place to start to see what a device's capabilities are.
BACNET TOPOLOGY
A typical
BACnet
Network consists of devices connected to physical networks. Each device is a separate
piece of hardware and has a physical connection to the network. Devices are given a unique
Device
Instance Number
which can be a number between 0 and 4194302. BACnet
MS/TP
devices have additional
addressing designations called
MAC
addresses. For most users it is the Device Instance Number which is
used as a reference, but the combination of the Network Number and
MAC
address of an
MS/TP
device
may be configured by a System Integrator to avoid any
MAC
address conflicts on the
EIA-485
network.