Specifications

Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 100 of 118
This document is uncontrolled when printed.
which are controlled by the Level Crossing Monitor software. Numbers in
the range 4 to 22 are Timer variables which are controlled by Boolean
expressions.
The state for Timer variables is either "0" or "1 ". "0" means that the
Timer variable is OFF or has a logical state of FALSE. "1" means that
the Timer variable is ON or has a logical state of TRUE. The Timer will
only become TRUE when the controlling Boolean expression has been
TRUE for the Timer length.
Examples of an Timer variable changing state are:
Mon 07-03-94 12:16:22.3 D 2
Mon 07-03-94 12:16:42.1 T 19
Mon 07-03-94 12:16:58.3 D 2
Mon 07-03-94 12:16:58.8 T 19
DXT 0
NORM_APP_T 1
DXT 1
NORM APP T 0
_
_
Note that the DXT becoming "0" starts the 20 second NORM_APP_T
timer which becomes TRUE 20 seconds later. The DXT becoming "1"
cancels the NORM_APP_T timer which becomes FALSE shortly
afterwards.
8.2.4 Analogue
A log entry type of "A" means that the log entry is for an Analogue
event. There are four types of analogue events. These are Voltage,
Lamp, Current, and Temperature events.
The number identifies the analogue channel for which the event
occurred.
The state is different for each analogue event type and is a means of
identifying the different types.
States of the form "nn.mm volts" are for battery voltage and voltage
change events.
States of the form "FU n" and "FD n" are for lamp change events.
States of the form "nn.m amps" are for battery test current, and
current events.
States of the form "nn.m degrees" are for temperature events.
8.2.4.1 Voltage
Battery voltage change events occur when the battery voltage has
changed by more than 0.5 volts from the last logged value.
General voltage change events occur based on the percentage
change specified in the expressions.
An example is:
Thu 07-04-94 03:51:01.0 A 1 Battery 14.53 volts