Trane Tracer Summit Hardware And Software Installation Manual page 53

Chapter 3 BCU I/O Module
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Both input wiring and output wiring are connected to the terminal block
TB1 on the BCU I/O module. The five UIPs are labeled UIP1 through
UIP5. The BOP is labeled BOP1. The BCU I/O module also has a 24 Vac
(100 mA) output to power transmitting devices. Odd numbered terminals
on TB1 are positive leads, and even numbered terminals are negative
leads, except for TB1-14. For current or voltage devices, always connect
the positive wire to positive leads and the negative wire to negative leads.
Refer to Figure 13 for terminal locations on TB1.
Figure 13. UIP Terminal and Jumper Locations
BMTW-SVN01F-EN