Specifications

Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 47 of 118
This document is uncontrolled when printed.
The following are the Drawing numbers in Specification 1071 for the
particular cables used:
Level Crossing Monitor to Input Optoisolator (No 1) M08-861
Level Crossing Monitor to VIOs (flasher cable) M08-862
Level Crossing Monitor to 8 way Output Optoisolator M08-
873
Level Crossing Monitor Serial channel A to the Modem M08-
863
If a cable is suspected of being faulty then you should check both end
connectors and ensure that the cable are securely attached. The
cable should also be checked for physical damage.
If still faulty then the cable should be checked for continuity and for
shorts. If a fault is found then the cable should be replaced with a new
one.
3.8 Modem
The modem must support the Hayes AT command set as its factory
default. Besides the configuration commands for the particular
modem it must in particular support the ATH, ATD, and ATZ
commands which are used by the Level Crossing Monitor software in
handling the modem.
The modems used must either operate from the Level Crossing
Battery supply or be separately battery backed up so that the Level
Crossing Monitor can report loss of the Council Supply. 240V mains
supply modems should not be used with any level crossing monitor
utilising remote battery testing from a Control Centre.
Only the Dataplex DPX-213 operates from a 10-20V DC supply. This
modem and the previously supplied DPX-223 are currently the only
ones used at level crossing installations.
All installations are to be fitted with a AUSTEL approved surge
protection device fitted to the phone line. This is required to protect
the modem from electrical storms and surges. The recommended unit
Model PF-6/S is available from Elsafe (KCC) Australia Pty Ltd Ph: 02
9938 5799. Please specify when ordering that you require the unit
with the 2 metre earth lead. This unit consists of a small box with a 1
metre long phone lead which plugs into the phone socket. The
modem plugs into the socket on the unit and the green/yellow earth
lead is connected to the earth busbar. This earth lead should be kept
as short as possible. The earth lead should be kept separate from
other cables and should not have excessive bends or kinks.
A number of level crossing monitors and modems have been
damaged by surges on the phone line which could have been
prevented with a suitable surge protection device on the phone line.