Connect The Fbxi To Bacnet Ms/Tp; Terminate The Ms/Tp Network; Attach Rs-485 Communication Wires To The Ms/Tp Subnet Port - ABB Cylon FBXi Series User Manual

CONNECT THE FBXi TO BACNET MS/TP

If the FBXi unit will be used with a
MS/TP Cabling Requirements
Note: Use Copper or Copper Clad Aluminum 70 °C conductors only.
Terminals
Conductor Area
Max cable length
TERMINATE THE
MS/TP NETWORK
If the FBXi is the first or last
device on the RS-485
then its MS/TP subnet
terminator switch must be set
to " "
in

ATTACH RS-485 COMMUNICATION WIRES TO THE MS/TP SUBNET PORT

Wiring the RS-485
configuration. One end of the network will be connected to the Fieldbus of the Network-level controller or
BACnet® router. At the other end of the network, the last device must be "terminated" by either installing a
100 Ω ... 120 Ω resistor or, if the last device is a FBXi, users can switch the
(located beside the
The shield (screen) must be carried through the entire network, and must be grounded at one point on the
network as shown below:
Network-level Controller or
Router
Termination
Shield connected at end switch set to
of network only
Note: If the RS-485 network is wired to an eSC, then the shield will be grounded at the eSC.
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BACnet MS/TP
PCB mounted plug terminal connections
Max: AWG 12 (3.31 mm2)
Min: AWG 22 (0.355 mm2)
1.2 km @ 38K4 baud
network,
network involves connecting the
MS/TP port) towards the
Network Segment
FBXi
end
Network
Shield continuous
throughout the
OFF network
FBXi Series |
fieldbus, connect it as described in the following section.
(95) and (96) terminals in a daisy-chained
A+ B-
icon. This will effectively terminate the network.
- - - - - -
Network cable Termination switch
segment daisy-chained set to ON at end of
to next device
Installation
MS/TP Subnet terminator switch
FBXi Network end
Network
Shield connected to
earth at one end of
network network only
49