Specifications

Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 16 of 118
This document is uncontrolled when printed.
Any other function that qualifies the operation of the Level Crossing (for
example approach signals HR and ALSR).
 Crossing normal relay.
 Reset fault or warning.
 Output state of each flasher.
Other relays/contacts of interest e.g Signal control relays, releasing
switches.
2.6 Digital Outputs
The level crossing monitor has 8 digital outputs. The current state of
these outputs is indicated on the front panel of the level crossing
monitor. These outputs are connected to the 8-way Output
Optoisolator which is used to drive the required external relays. This
output optoisolator switches a common positive and are suitable for
operating relays. In particular they are suitable to drive 12 volt BRB
930 series relays directly.
The Level Crossing monitor outputs are as follows:
1 Battery test
Used to control battery test relay.
2 No Fault
This output is ON when no fault condition has been detected with
either the level crossing monitor or the level crossing equipment.
The fault indication remains until reset. This output may be used in
the future to control a external flashing beacon which indicates
healthy/faulty level crossing operation to the train driver or public
road users.
3 No Warning
This output is ON when no warning condition has been detected
with the level crossing equipment. The warning indication remains
until reset.