THE MATRIX-2 INTEGRATED ETHERNET SWITCH
The MATRIX-2 includes an integrated Ethernet Switch, with 2 ports. This allows the device to forward IP
packets from each port to the other, allowing MATRIX-2, FBXi, FBVi and CBXi devices to be connected in a
Daisy-Chain topology:
It is recommended is that both ends of a MATRIX-2 / FBXi / FBVi / CBXi daisy chain network are connected to
a single switch that supports the Spanning Tree network switch protocol (STP). In this scenario a single line
break or controller failure in the loop will allow all controllers to continue to communicate.
For example, if controllers
A
,
B
,
C
,
D
and
E
are daisy-chained, connected on both sides, with a single switch
supporting Spanning Tree Protocol:
• If controller
B
loses power, controller
A
will be on one trunk, and
C
/
D
/
E
will be on another all
communicating.
• If controllers
B
and
D
lose power, controllers
A
and
E
will communicate, but controller
C
will not.
Note: The FBVi Series controller has a pass-through across its IP switches, such that if it loses power controllers
‘downstream’ will continue to be connected. Only the FBVi Series has this feature.
Note: If you plug both ends of the daisy chain network into a switch that does not support the Spanning Tree
Protocol, it will flood the network with requests. The switch will send and receive the same messages over
and over again, until something breaks.
CONNECT THE MATRIX-2 TO BACNET MS/TP
If the
MATRIX-2
unit
will be used with a BACnet MS/TP fieldbus, connect it as described in the following
section.
MS/TP Cabling Requirements
Note: Use Copper or Copper Clad Aluminum 70 °C conductors only.
TERMINATE THE MS/TP NETWORK
If the MATRIX-2 is the first or last device on the RS-
485 network, then its MS/TP subnet terminator
switch must be set to “in”
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