Specifications

Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 89 of 118
This document is uncontrolled when printed.
Ah is length of the timer in hours. A is the number of hours in the
range of 0 to 255 and h identifies that A is the number of hours. Ah is
optional when the timer length is less than one hour.
Bm is length of the timer in minutes. B is the number of minutes in the
range of 0 to 59 and m identifies that B is the number of minutes. Bm
is optional when the timer length is less than one minute.
Cs is length of the timer in seconds. C is the number of seconds in the
range of 0 to 59 and s identifies that C is the number of seconds. Cs
must always be declared even when C is 0.
y is a Boolean expression as described previously. Example Timer
Expressions:
; Check that a local or remote test of LX is done within
36hrs of previous test
*NO_TEST =T 36h 0m 0s !BATT_TEST_OP & TEST_ZK
; Check AC supply
*AC _SUP_WAR =T 6h 30m 0s !AC_SUPPLY
; warn if AC supp out longer than 6hrs 30 min
; Low battery timer
*LOW_BATT _TIMER =T 3s !BATT _ALARM_CARD + *BATT_LOW ; time
delay before low batt
7.1.2.10 Lamp expression
A lamp expression is used to configure the system with the analogue
channel a particular set of level crossing lamps are being monitored
by, the number of lamps expected when the flasher is in the UP
position, the number of lamps expected when the flasher is in the
DOWN position.
Lamps expressions have the following format:
x =L A B C u
where
x is a internal variable which was declared in the IO list as a Lamp. =L
identifies that it is a Lamp expression.
A is the analogue channel in the range of 1 to 7 that is used to
monitor the particular set of lamps. Typically Channel 2 is used for the
Sydney side lamps, 4 is used for the Country side lamps, 3 is used for
the Sydney side tip lights for booms, and 5 is used for Country side tip
lights for booms.
B is the number of lamps expected when the lamps are operating and
the flasher is in the UP state. The number must be in the range of 0 to
4. This is the number of lamps when a steady set of lamps is being
monitored.