User manual

WHEN WOULD I USE A ROUTER? PRODUCT OVERVIEW
1-6 MATRIX BACnet Router User Manual (6/6/2007)
1.2.3 MULTI-BUILDING COMMUNICATIONS
Many of the communication capabilities within BACnet/IP are dependent on the use of broadcast
messaging. In most IT networks, broadcast messages are blocked or forbidden.
To allow multiple BACnet/IP networks to communicate as flexibly as other traditional Ethernet protocols,
select MATRIX BACnet Routers can be configured to act as a BACnet Broadcast Messaging Device
(BBMD). A BBMD will take broadcast messages originating from one network and forward them onto other
defined networks that have a BBMD or MATRIX BACnet Router configured as a BBMD.
Figure 1-3 BACnet System Architecture with BBMD
In the example above, messages originating from the head-end or either control network using a MATRIX
BACnet router can be distributed throughout the entire system in a logical and straight-forward approach.
Providing BBMD capabilities within the MATRIX BACnet Router avoid possible network security issues in
an existing IT network.
NB-VAV
VAV Boxes
NB-ASC
e
Packa
g
e
d
E
q
u
i
p
m
e
n
t
NB-ASC
e
Packa
g
e
d
E
q
u
i
p
m
e
n
t
ipment
its
SBC-STAT3
Can be used on
all NB Controllers
75° F
SBC-STAT3
Can be used on
all NB Controllers
75° F
MATRIX-RTR-BBMD
Network Controller
BBMD Enabled
Auto-Pilot
with BACnet Driver
BACnet/IP ; BACnet/Ethernet
BACnet/MSTP
STATbus
WAN/Internet
IP Subnet 3
IP Subnet 1
IP Subnet 2
NB-VAV
VAV Boxes
q
u
i
p
m
e
n
t
N
B
-
A
-
S
A
A
C
e
P
a
c
k
a
k
k
g
e
d
E
q
u
i
p
m
e
n
t
ent
s
SBC
-
S
T
A
T
T
C
a
n
b
e
u
a
ll
N
B
C
o
7
5
°
F
SBC
-
S
T
A
T
T
T
A
A
3
C
a
n
b
e
u
s
e
d
o
n
a
ll
N
B
Con
t
r
oll
e
r
s
7
5
°
F
MATRIX-RTR-BBMD
Network Controller
BBMD Enabled