User's Manual

SECTION III OPERATION
SM 7063 07/97 3-22
3.10.1 Description of Arming Process
1. The operator at the end of the train relays the End Unit ID code to the locomotive operator via voice
radio.
2. The locomotive operator enters the ID code of the End Unit into the CDU (see Viewing and
Changing the ID Code, Section 3.8.1).
If the CDU has been “disarmed” or is not armed to the new ID code, the
ALARM
annunciator will
flash ON accompanied by 5 beeps from the sonalert, and the
ID Code Display
will alternate
between:
" ID = ##### "
and
“ NOT ARMD”
In addition, the
Function Menu Display
reads:
" System is NOT ARMED "
3. The locomotive operator then alerts the operator at the end of train via voice radio to proceed with
Arming. The operator at the rear of the train momentarily presses the TEST button on the End Unit.
This causes a "Request to Arm Message" message containing the End Unit’s ID code to be
transmitted to the CDU.
4. When the CDU receives the "Request to Arm Message" it prompts the Cab operator for a response.
The
Function Menu Display
reads:
" PRESS COMM / ARM TO ARM "
for FIVE seconds accompanied by beeps from the sonalert.
5. If the locomotive operator presses the
SET
key during the 5 second window, a "Command to Arm”
message is transmitted to the End Unit. When the End Unit receives the "Command to Arm”
message, it responds by transmitting an "Arming Confirmation” message back the CDU. The CDU
will then briefly display:
" SYSTEM IS NOW ARMED "
completing the Arming process. The “NOT ARMD” ALARM indication will turn OFF. The optional
ARMED Status LED will light, if equipped on the CDU front panel.
The CDU is now authorized to execute an Emergency Brake Command, if required.
6. If the
SET
key is not pressed during the 5 second window, or if the End Unit doesn’t respond as
described above, the
Function Menu Display
will briefly show:
“ ARMING FAILED "
In this case, the process must be repeated from Step 3 above.