Union Products Communication display Unit 6696 ユーザーズマニュアル

SM 7063  07/97                                                                                                                              3-1

This section provides detailed information on the CDU’s various operating modes and functions, and
how each one is used.

Each End Unit has a unique 5-digit numeric Identification Code (ID Code) assigned by the AAR
“Central Train Information System Clearinghouse”.  The ID Code is programmed into each End Unit
and is a part of every message it transmits.  This code is permanently marked on a label or plate
mounted on  the outside of the End Unit.  The ID code entered into the CDU must match the End Unit
ID code before EOT messages can be received and displayed.  Likewise, the End Unit will only accept
and process commands from a CDU with the matching ID code.

Since all End Units transmit on the same radio channel frequency (typically 457.9375 MHz), the ID
code is the only way the CDU can distinguish one End Unit from another.  In a similar fashion, all
CDUs transmit on the same radio channel frequency (typically 452.9375 MHz) and the End Unit relies
on the ID code to distinguish between commands sent by the CDU.

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ID = 85323