Communication Link Connection Procedure; Lontalk Communication Interface (Lci-C) - Trane RTAA-70 Installation & Maintenance Manual

RTAA-SVX01A-EN
Installation — Electrical
controller or a remote display panel. A shielded, twisted-pair connection
establishes the bidirectional communications link between the unit control
panel and the Tracer, multiple-machine controller or remote display panel.
NOTE: The shielded, twisted-pair conductors must run in a
separate conduit.
Field wiring for the communication link must meet the following
requirements:
1. All wiring must be in accordance with the NEC and local codes.
2. Communication link wiring must be shielded, twisted-pair wiring (Belden
8760, or equivalent).
3. The maximum total wire length for each communication link is 5,000 feet.
4. The communication link cannot pass between buildings.
5. All UCM's on the communication link can be connected in a "daisy chain"
configuration.

Communication Link Connection Procedure

1. Refer to the Tracer installation literature to determine proper communica-
tion link termination connections at the Tracer unit.
2. Refer to the Remote Clear Language Display installation procedure in
this manual.
3. Connect the shield of the communication link wiring to the designated
shield terminal at the Tracer unit.
4. Connect leads 561 and 562 from the proper terminals of 1U2TB2 on the
UCM to the Tracer. There is no polarity requirement for this connection.
5. At the UCM, the shield should be cut and taped to prevent any contact
between the shield and ground.
NOTE: On multiple-unit installations, splice the shielding of the two twisted-
pairs that come into each UCM in the "daisy chain" system. Tape the spliced
connections to prevent any contact between the shield and ground. At the
last UCM in the chain, the shield should be cut and taped off.
6. For unit ICS address selection, see ICS Address (Service Settings Menu).

LonTalk Communication Interface (LCI-C)

The Tracer LCI-C interface acts as a translator between Trane's IPC (Inter-
Processor Communication) and Echelon's LonTalk® communications protocol
(ANSI/EIA/CEA 709.1). This allows the chiller to communicate with building
automation systems which also communicate using the LonTalk® protocol.
The LonTalk® communications protocol also allows for peer to peer commu-
nications between controllers so they can share information. Communicated
setpoints have priority over locally wired inputs to the controller unless the
controller is set to the "Local" control mode.
The LCI-C module provides connectivity to Trane's Rover® service tool for
proper configuration of the LCI-C module.
NOTE: LonTalk® communication links are not polarity sensitive.
1. Connect BAS leads to J3-1,2 or J3-3,4.
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