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

CONNECT THE CBXI TO BACNET MS/TP

If the CBXi 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 CBXi-8R8(-H)
the RS-485 network, then its
terminator switch must be set to "

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 CBXi. 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 CBX, users can switch the
port) towards the
The shield (screen) must be carried through the entire network, and must be grounded at one point on
the network as shown below:
CBXi-8R8(-H)
Termination
Shield connected at end switch set to
of network only
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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
is the first or last device on
MS/TP subnet
"
in
network involves connecting the
MS/TP
icon. This will effectively terminate the network.
Network Segment
end
Network
Shield continuous
throughout the
ON network
CBXi IP Controller |
fieldbus, connect it as described in the following section.
(95) and (96) terminals in a daisy-chained
A+ B-
Subnet terminator switch (located beside the
- - - - - - CBX/CBV/CBT
Network cable Termination switch
segment daisy-chained set to ON at end of
to next device
Installation
MS/TP
Network end
Network
Shield connected to
earth at one end of
network network only
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