Tracer
®
ZN.520
78 UNT-IOM-6
Table 29. Zone sensor wiring connections
TB1 Description
1 Space temperature
2 Common
3 Setpoint
4 Fan mode
5 Communications
6 Communications
The Tracer
®
ZN.520 controller communicates via Trane’s Comm5
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 Comm5
communication links.
The controller provides six 0.25-inch quick-connect terminals for the
Comm5 communication link connections, as follows:
• Two terminals for communication to the board
• Two terminals for communication from the board to the next unit
(daisy chain)
• Two terminals for a connection from the zone sensor back to the
controller
Communications
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