Chapter 4 UCM Communication-Link Wiring
56 BMTW-SVN01F-EN
(72±6 pF/m). Trane wire 400-2028 is recommended. Consult your local
Trane sales office.
Comm5 UCM Communication-Wire Characteristics
The recommended Comm5 communication wiring is 22-gauge, Level 4,
twisted-pair wire, either shielded or unshielded. However, you can also
use low-capacitance, 18-gauge, shielded, twisted-pair with stranded,
tinned-copper conductors (Trane “purple” wire).
Comm5 links should use the daisy chain configuration. The wiring run
length should be limited to 4,500 ft (1,400 m) with no more than eight
zone sensor communication stubs (maximum 50 ft). The links should not
be a star, or trunk and branch configuration.
Recommended Configurations for UCM Communication-Link
Wiring
UCM communication-link wiring must use one of the following
configurations:
• Daisy chain configuration, shown in Figure 24.
• Daisy chain configuration for Comm5, shown in Figure 25 on page 57.
• Branch configuration, shown in Figure 26 on page 58.
(This configuration should not be used with Comm5 communication
links.)
Figure 24. Daisy Chain Configuration for UCM Communication-Link
Wiring, Preferred Configuration for Comm 3, Comm4, or Comm5
Figure Note:
• Maximum wire length for the entire configuration is 5,000 ft (1,524 m).
• Maximum wire length for Comm5 is 4,500 ft (1,400 m)
(Comm5 wire length limitations can be extended through the use of a link
repeater; see “Comm5 Physical Link Repeater” on page 60).
(Comm5 only)
(Comm5 only)
Termination resistor
Termination resistor
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