100 UNT-SVX07B-EN
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Communications
Tracer ZN520 controller communicates via Trane’s LonTalk protocol. Typically, a communication
link is applied between unit controllers and a building automation system. Communication also is
possible via Rover, Trane’s service tool. Peer-to-peer communication across controllers is possible
even when a building automation system is not present. You do not need to observe polarity for
LonTalk communication links.
The controller provides six 0.25-inch quick-connect terminals for the LonTalk communication link
connections, as follows:
• Two terminals for communication to the board
• Two terminals for commu
nication from the board to the next unit (daisy chain)
• Two terminals for a connecti
on from the zone sensor back to the controller
Table 29. Zone sensor wiring connections
TB1 Description
1Space temperature
2Common
3Setpoint
4Fan mode
5 Communications
6 Communications
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