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ZONESENSE EN54
INSTALLATION COMMISSIONING & OPERATION
8.3
LED Annunciator Master (LAM) Card
LED annunciators (LAM
’s);
Are used to display fire system information at locations that are remote from the FACP.
Have common FACP controls, status indicators, eight alarm and eight fault/disable/test
indicators;
Generally are located in the front entrance of buildings, or in areas that are occupied by
people who are responsible for responding to an emergency.
Contain all communications interfacing and power supply circuitry.
Controls, LAMP TEST and SILENECE BUZZER have tactile and audible feedback (0.25
second tone burst) of operation.
Terminals are a plug-in type and cater for up to 2.5mm cables.
Communications
Communications is, RS485+, RS485-, and Screen. The communications is based on half duplex
RS485. The RS485+ and RS485- carry the data and allow the LAM to communicate with the FACP.
The Screen terminal is an equalisation wire to ensure the LAM and the FACP are at the same
voltage potential. The LAM must therefore be powered by a supply which is isolated from any earth
connections. A 4 way DIP switch sets the LAM address and the termination link (LK) must be
inserted on the last card.
3 RS485 communications IN and 3 RS485 communications OUT terminals are provided
Power Supply
The LAM operates from 24VDC so 2 power IN and 2 power OUT terminals are provided. To meet
the requirements of communication interfacing an isolated DC to DC converter is used.
LAM Buzzer
The buzzer is fitted to the PCB and provides audible:
Indication of a fire condition. Tone is continuous until the fire condition is cleared by a reset
or the buzzer is silenced locally or at the FACP
Indication of a fault condition. Tone is 1 second on, 1 second off, until the fault condition
clears or the buzzer is silenced locally or at the FACP.
Feedback when a key is pressed. Tone is 0.25 second burst
In addition the buzzer:
Can be silenced by front panel control.
Resounds on any new alarm or fault condition.
Sounds during a lamp test.
Will not sound during alarm, fault or walk tests. This is handled by the FACP
Summary of Terminations
Terminal Number
Terminal Description
Terminal Operation/Build Option
Communications (CON1862)
1
RS485 +ve
Incoming communications cabling
2
RS485 -ve
3
Shield
4
RS485 +ve
Outgoing communications cabling
5
RS485 -ve
6
Shield
Power (CON1862)
7
+ 24VDC
Incoming power cabling
8
0VDC
9
+ 24VDc
Outgoing power cabling
