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26 BAS-SVP10A-EN
Wiring Requirements for Communicating Thermostats
BACnet Wiring Procedure
Follow these steps to connect communication wiring as shown in Figure 3, p. 26.
1. Attach the communication link wiring to the Tracer SC at Link 1 or Link 2.
Note: It is not necessary to place the Tracer SC at the end of the of the communication link.
2. Attach the wiring fromthe first unit controller to thefirst set of communication terminals onthe
next unit controller.
Note: Some unit controllershave onlyone setof communication terminals.In thatcase, attach
the wiring to the same set of terminals.
3. Wire and tape shields together at each unit controller between the Tracer SC and the BACnet
terminator.
4. Repeat steps 1 through 3 for each unit controller on the link.
Note: For more information about the specific unit controller you are wiring, see the
Installation Guide for the specific controller.
Figure 3. Daisy chain configuration for BACnet wiring
Trane BACnet Termination for BACnet Links
For correct termination placement, follow these guidelines:
• All BACnet links must be properly terminated. Use a Tracer BACnet terminator at each end of
the link.
• Connect the communication wire shield to the ground terminal of the link termination block at
the Tracer SC as shown in Figure 2. The Tracer SC provides the ground for the BACnet/MSTP
link.
• Tape back the shield at each of the BACnet terminators.
• 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 BACnet terminators.