Union Products Communication display Unit 6696 Manuale Utente
SECTION I INTRODUCTION
SM 7063 07/97 1-1
1.0
PURPOSE OF MANUAL
This manual provides general information on the DIGITAIR
End-of-Train Telemetry System and
detailed information on the installation and operation of the Model 6696 Communication Display Unit
(CDU). Refer to Service Manual SM 7064 for detailed Shop Maintenance information.
(CDU). Refer to Service Manual SM 7064 for detailed Shop Maintenance information.
1.1
GENERAL OVERVIEW
The DIGITAIR
End-of-Train Telemetry System consists of a Communication Display Unit (CDU)
mounted in the locomotive cab which communicates via UHF radio with an end-of-train End Unit mounted
on the coupler of the last train car.
on the coupler of the last train car.
The CDU, when operating in conjunction with an End Unit such as the DIGITAIR
Model 6695 SBU,
provides the locomotive operator with information about the conditions at the rear of the train that are
important to the operation of the train. The CDU’s major functions include:
important to the operation of the train. The CDU’s major functions include:
A digital display of the brake pipe pressure at the rear of the train.
An indication of motion of the last car (moving/stopped) and its initial direction (forward/reverse).
The End Unit battery status and other warnings about brake pipe pressure.
The On/Off status of the Highly Visible Marker (HVM) light if equipped on the End Unit.
When operating in two-way mode, provides an Emergency braking function from the rear of the train.
The CDU can be configured to support optional functions such as:
A digital display of the auxiliary pressure if transmitted by dual pressure type End Units.
A built-in odometer to display the distance traveled by the locomotive, speed, and/or acceleration.
The CDU Model 6696 is compatible with all End Units employing existing protocols such as the
American Association of Railroads (AAR) End-of-Train message protocol. It meets or exceeds the
guidelines of the AAR along with the Federal Railroad Administration (FRA), the Federal
Communications Commission (FCC), Industry Canada (IC), and the Canadian Department of
Communications (DOC) regulations.
American Association of Railroads (AAR) End-of-Train message protocol. It meets or exceeds the
guidelines of the AAR along with the Federal Railroad Administration (FRA), the Federal
Communications Commission (FCC), Industry Canada (IC), and the Canadian Department of
Communications (DOC) regulations.
HVM
END UNIT
BRAKE PIPE AIR
LAST CAR
450-475 MHz RF LINK
-BRAKE PRESS.
-BATTERY STATUS
-HVM STATUS
-CAR MOTION
-BATTERY STATUS
-HVM STATUS
-CAR MOTION
VEHICLE
BATT.
BATT.
ODOMETER
INPUT (OPT.)
INPUT (OPT.)
CDU 6696
LOCOMOTIVE
-COMMS LINK TEST
-EMERGENCY ACTIVATION
-EMERGENCY ACTIVATION
Figure 1-0. Two-Way Telemetry Functions
UHF RF LINK