Specifications
Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 91 of 118
This document is uncontrolled when printed.
the battery test. Typically this is set at 6.0. It is a real number and
must be in the range of 5.0 to 20.
E is the value below which the battery test current in amps is checked
to be whilst a battery test is not being carried out. A value of 0 is not
normally suitable due to problems with the Analogue to Digital
Converter used, and the Current Sensor used. Typically this is set to
1.0 amps. It is a real number and must be in the range of 0 to 2.0.
Example of a Battery Expression:
*BATTERY =B 11.7 0.16 8 6.0 1.0
7.1.2.12 Analogue expression
A analogue expression is used to configure analogue inputs for
general purpose logging. It details the type of measurement the
analogue channel is being used for, its channel number, the scale for
the input, and the percentage change to log.
Analogue expressions have the following format: *x =A A B C D
where
*x is the name used for the analogue channel.
=A identifies that it is an Analogue expression.
A is the analogue channel number for the this expression.
B is the type of measurement the analogue channel is being used for.
This is VOLTS for voltage measurements, AMPS for current
measurements, and TEMP for temperature measurements.
C is the scale factor used for displaying the measure value. The
measured value is scaled so that it is in the range of 0 to the scale
number. The scale number must be in the range of 1 to 255. Typically it
will be 5, 20, 50, or 100.
D is the percentage change required between the current measured
value and the previously measured value for the current value to be
logged. This must be in the range of 2 to 50 percent.
Examples of Analogue Expressions are:
* VOLTAGE =A 5 VOLTS 5
2
%
*CURRENT =A 6 AMPS 20
3
%
*TEMPERATURE =A 7 TEMP 100
5
%
7.1.3 Variable configuration data
Configurable items that can be changed during normal operation and
their purpose are detailed in this section. These values are set
during