Ucm Communication-Wire Characteristics - Trane Tracer Summit Hardware And Software Installation Manual

Communication-Link Wire
Figure 23. Typical UCM Communication-Link Field Wiring
Figure Note:
If unshielded wire is used (as recommended for Comm5), there is no shield con-
nection.

UCM Communication-Wire Characteristics

(This section applies only to Comm2, Comm3, Comm4 wire.)
UCM communication-link wiring must be low-capacitance, 18-gauge,
shielded, twisted pair with stranded, tinned-copper conductors. For daisy
chain and branch configurations, limit the wire run length to 5,000 ft
(1,524 m).
Wire capacitance (measured in picofarads/foot [pF/ft] or
picofarads/meter [pF/m]) between conductors must be 23±2 pF/ft
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