Trane BACnet MS/TP Installation, Operation And Maintenance Manual page 12

Best Practices
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Note: Some third-party devices have a network terminator built into the device. The use of the terminator
Figure 7.
BACnet Link
(maintain polarity)
–
+
LINK 2
Use either Link 1
or Link 2
Tracer SC+
Use the built-in terminator on the BCI-R when the BCI-R is the last node in the network.
The Trane BCI-R has a built in BACnet
terminator should be installed as shown in the BCI-R installation guide (RF-SVN03*-EN). For other BCI-
R devices that are not the last node on the link, verify that the terminator has not been wired to the network.
Note: The new BCI2-R does not have a built in terminator. If a new BCI2-R is the last node on the link,
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Tape back the shield at each of the Tracer
metal components.
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Note: If a Tracer
UC400 is at the end of the link, the process is the same. The Tracer
the ground wherever it resides on the link.
During installation, compile a set of as-built drawings or a map of the communication wire layout.
Sketches of the communication layout should feature the Tracer
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The Tracer BACnet Terminator is a powered device and it will not work without a power source.
Connect TBT power terminals to a 24 Vac/Vdc power supply.
is usually controlled by a jumper or switch on the device itself. Verify that the terminators on each
device are disabled, so that only the TBT are biasing the network.
Terminating BACnet
Comm (field-supplied)
Use either IMC
connection
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an external BACnet terminator must be added.
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BACnet terminators to prevent accidental contact with
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links using BACnet terminators
Power
(included
with TBT)
Cut and tape
back the
shield wire
BACnet-
BACnet
Terminator
24 Vac/Vdc
BACnet+ (red wire)
Ground
(black wire)
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terminator. If a BCI-R is the last node on the network, this
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BACnet terminators.
BACnet- BACnet+ Ground 24Vac/Vdc
Front
BAS-SVX51L-EN
SC+ provides