Chapter 5 UCM Wiring and Addressing
144 BMTW-SVN01F-EN
Termination resistors are required for correct installation of UCMs on the
Comm5 link. See “Termination Resistance Placement for Comm5 Links”
on page 59.
Neuron ID
Each Comm5 UCM or LonTalk
®
device is assigned a unique identification
number called a Neuron ID. The Neuron ID number is typically printed
on a label located on the logic board of each UCM. You can view the Neu-
ron ID number from Tracer Summit when communication is established.
An example Neuron ID format is 00-01-64-1C-2B-00. (See the Tracer
Summit System Programming guide.)
Comm5 Zone Sensor Communication Jack
Many Trane zone sensor models include a communication jack. When
properly wired to the communication terminals on the unit controller, the
communication jack provides easy access to both the controller and the
entire Comm5 link. This enables you to access the status and configura-
tion information of any controller on the link using a service tool.
The recommended wire between the controller and the communication
jack is 22-gauge, Level 4 wire; or 18-gauge, shielded, twisted-pair with
stranded, tinned-copper conductors (Trane “purple” wire). Thermostat
wire is not recommended for the communication jack.
Zone Sensor Communication Stubs
The wire that runs between the controller and zone sensor is commonly
referred to as the communication stub. Figure 65 on page 145 shows an
example of communication stubs on a Comm5 link when a repeater is
used.
Note:
• Only 8 stubs can be used per Comm5 link. To add more
stubs to the link, a repeater is necessary. Up to 8 stubs may
be used on each side of the repeater (16 total stubs).
• Each communication stub must not exceed 50 feet in
length.
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