Specifications

RailCorp Engineering Manual — Signals — Equipment Manual

Cerberus Level Crossing Monitor Field Equipment Manual TMG E1261

Issued August 2012 UNCONTROLLED WHEN PRINTED Version 2.1

3.2 Tools and Maintenance

A number 1 posidrive screwdriver is required to remove the lid of the main box.

A 2.5 mm flat blade screwdriver is required to remove individual wires from the

connectors used on most modules in the system.

A multimeter is required for most fault finding.

A portable PC with a copy of the program LX_MAINT.exe is required.

A suitable 9 pin female to 9 pin female null modem serial cable with possibly a 25 pin to 9

pin converter if required for the PC. Note that the level crossing monitor end of the cable

needs a moulded plug with loopback for CD to DTR and RTS to CTS.

Null Modem cable connections

D9 Female (PC) D9 Female (LXMON)

2 RX ↔

3 TX

3 TX ↔

2 RX

5 SG ↔

5 SG

1 CD ↔ 4 DTR (loop

Back)

1 CD ↔ 4 DTR (loop

Back)

7 RTS ↔ 8 CTS (loop

Back)

7 RTS ↔ 8 CTS (loop

Back)

The D9 Female connector at the level crossing monitor end requires a moulded (flush

fitting) connector if it is used with a V1.0 monitor. This is due to the recessed serial ports

used on the V1.0 monitor. The new V3.0 level crossing monitor does not have recessed

serial ports and can use D9 connectors with any type of backshell.

A 28 pin IC extractor for removing EPROMs.

3.3 Maintenance Instructions

Prior to conducting routine maintenance of the Level Crossing Signalling equipment the

Fault Reset button on the Monitor should be pushed and held for 5 seconds. This places

the level crossing monitor in maintenance disable mode. The Logic indication should be

flashing once per second which indicates that the monitor has had its reporting of status

changes disabled temporarily.

When in this state the monitor will not report changes of status to the Control Centre. It is

cancelled by a momentary push of the Fault Reset button or at pre-programmed interval

after activation. Normally this time-out is set at 45 minutes.

At the completion of the maintenance tasks all Faults and Warnings must be cleared

before cancelling this mode otherwise they will be reported to the Control Centre. The

maintenance disable state is cleared by a 0.5 second press of the Fault reset button.

When investigating level crossing faults and using the monitor it is important to download

the event log to disk before erasing/deleting the event log.