Problems With The Bcu Modem Programming Setup; Bcu Does Not Communicate With Ucms; Communication Failures On Initial Installation; Communication Failures That Occur After Initial Installation - Trane TRACER SUMMIT Hardware And Software Installation

BMTX-SVN01C-EN

Problems with the BCU modem programming setup

Follow these guidelines for proper modem programming setup:
The modem will not work at all until the BCU has been programmed
•
to have a modem object. Verify that the BCU has a modem object.
If the phone line goes through a local phone system within the build-
•
ing, additional wait times and access numbers may need to be pro-
grammed into the phone numbers being used for dial out and remote
access.
Verify that the correct phone number is being used when attempting
•
to dial into a BCU.

BCU does not communicate with UCMs

UCM communication problems can generally be divided into two main
groups:

Communication failures on initial installation

•

Communication failures that occur after initial installation

•
Communication failures on initial installation
Failures that occur during the initial installation can generally be traced
to:
Wiring errors, i.e., wrong polarity, shorts between conductors, open
•
wires, bad high-resistance connections, use of wire with too high
capacitance, too long total communication-link length (high resis-
tance), wrong connections at the BCU or UCM, etc.
• Communication failures caused by nearby strong sources of
EMI/RFI interference
• Incorrect UCM addresses
Incompatible hardware or software versions of the UCM and/or of
•
Tracer Summit
Failure to install termination resistors where needed
•
BCU site configuration not programmed correctly
•
Communication failures that occur after initial
installation
Failures that occur after successful communication following initial
installation can generally be traced to:
Wiring problems, i.e., shorts or opens that develop from wire that is
•
damaged from either being pulled too tightly across sharp objects or
from building vibration
Communication failures caused by nearby strong sources of
•
EMI/RFI interference that have been added since original wiring
installation
BCU does not communicate with UCMs
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