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

• More lamps are operating than expected (possible short circuit).

A status indication of FAULT & BATTERY is indicated if the level crossing has:

• the battery voltage is below the alarm point configured in the expression file as

measured by the level crossing monitor for more than 3 seconds.

• the Store 74 Low battery alarm card has tripped for more than 3 seconds.

• The remote testing of the level crossing battery has not produced the test current

specified in the expression file.

It is possible to have multiple status indications which would indicate that more than one

fault or warning has occurred. For example a failure of a flasher unit will give FAULT &

LAMP & LOGIC.

A status indication with LOGIC flashing once per second indicates that the monitor has

had its reporting of status changes disabled temporarily (called maintenance mode).

When in this state the monitor will not report changes of status to the Control Centre via

modem. This state, is entered by holding the Fault Reset button pressed for 5 seconds. It

is cancelled by a momentary push of the Fault Reset button or after a time delay of 45

minutes. This function is provided so that maintenance staff can conduct maintenance

activities at the level crossing without causing unnecessary faults and warning to be

reported back to the Control Centre. All Faults and Warnings must be cleared before

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

1.5 Control and Interrogation

The control, interrogation, and reporting facilities are provided via the RS232 serial ports

labelled channel A, and channel B. Normally a dial-up modem is connected to channel A.

Maintenance staff may Control and interrogate the Monitor using a Personal Computer

and one of two programs. The ‘Cerberus’ software will operate on all windows versions

up to WinXP.

The dial-up modem is connected to serial channel A. Serial channel B is available for on-

site maintenance staff. The maintainers PC is directly connected to the Level Crossing

Monitor serial channel B via a null modem serial cable. The cable must include loopbacks

on the Level Crossing Monitor end. These are DTR to CD, and RTS to CTS. See section

4.2 for further details of the cable configuration. Normally the Laptop PC end of the cable

is plugged into serial port 1.

The level crossing monitors have a default set-up of:

Serial Channel A Serial Channel B

9600 bps 19200 bps

8 data bits 8 data bits

1 stop bit 1 stop bit

no parity no parity

The functions available to a user are menu driven. These functions include obtaining the

event log, IO states, configuration details, and status change times as well as conducting

a remote battery test. Some menu items are protected by a PIN number.

The PIN numbers will be common for a Region and are available through the District

Signal Engineer or Signal Engineering.