Air Brakes and Train Handling Rules - Alaska Railroad

68 EOT Telemetry Devicesa. The LCU displays a flashing [NO COM] message for 5seconds and sounds 5 alarm beeps.b. The LCU displays the EOT unit’s ID number for 2 seconds.c. At the end of the alarm, the LCU displays a steady [NOCOM] message.NOTE: If all segments of all digits of the display are on, theLCU is waiting for its first valid report and the [NO COM]alarm timer is not armed (see Rule 68.8.3A).2. When the LCU receives a valid report from the EOT unit, the[NO COM] message is replaced by the normal pressure display.3. Once the LCU has displayed a [NO COM] message, the LCUwill display the ID number of the transmitting EOT unit for 2seconds whenever it receives a report. This feature helps theengineer determine the correct ID number of the train’s EOT unitif the LCU’s thumbwheels are set incorrectly.CAUTION: In this situation, the LCU displays the ID numberof the transmitting EOT unit, whether or not the numbermatches the LCU’s thumbwheel setting. The displayed IDnumber could possibly be the ID number from a nearbytrain.If you are not sure that the displayed ID number is that ofyour train’s EOT unit:a. Set the thumbwheels to the displayed ID.b. Wait for the normal pressure display to appear.c. Make a 5- to 7-psi brake application and see if theair pressure display changes as you expect.Causes of the [NO COM] Message. The [NO COM] alarm messagecan be caused by:• Operating in a long tunnel• Operating a long train near other trains on adjacent tracksJune 1, 1996 ARRC Air Brakes and Train Handling Manual 68-31