Chapter 7 Wiring Comm5 Links; Wiring And Topology Recommendations - Trane Tracer MP581 Hardware Installation

CNT-SVN01C-EN
Chapter 7
Wiring Comm5 links
The Tracer MP581 controller interacts with a Tracer Summit building
automation system (BAS) and other LonTalk Comm5 controllers through
a Comm5 communication link. This chapter describes how wire Comm5
links.
For more information on connecting a Tracer MP581 to a Tracer Summit
BAS, see the Tracer Summit Hardware and Software Installation guide
(BMTW-SVN01D-EN).

Wiring and topology recommendations

Trane GCS has updated its recommendations for Comm5 wiring and
topology. These recommendations are different than originally published
Comm5 installation practices. The following information summarizes the
wiring and topology recommendations:
22 AWG Level 4 unshielded communication wire recommended for
•
most Comm5 installations
Shielded Level 4 wire is recommended for the Comm5 Tracker and for
•
all communication wiring on the VariTrac CCP (see Appendix)
Comm5 link limits: 4500 feet, 60 devices maximum (without repeater)
•
Termination resistors are required
•
—105 ohms at each end for Level 4 wire
—82 ohms at each end for Trane "purple" wire
Comm5 topology should be daisy chain
•
• Zone sensor communication stubs limited to 8 per link, 50 feet each
maximum
• One repeater can be used for an additional 4500 feet, 60 devices, 8
communication stubs
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