Page 16
FIREFINDER SERIES II
INSTALLATION,
COMMISSIONING
&
OPERATION
4.11 Main Board (BRD85MBA)
The Main Board is the "heart" of the FACP and carries the devices for interconnecting to all the other
Boards, a buzzer for auditory indication, the backlight power supply for the LCD and CPU Reset.
The Main CPU is mounted on this board and connected to it by CN11. The main connection board
then provides interfacing to
Up to 4 Slave CPU’s
A printer
A Modem/Graphics Output
An Expansion Panel
An Internal serial bus
An External communication bus.
RV1
– LCD contrast adjust
Supply and Current = 27VDc @ 120mA
Connections
CN1
Keyswitch Input
CN12
LCD Graphic
CN2
Expansion Panel
CN13
Slave CPU connection
CN3
Serial Communication Port
CN14
Slave CPU connection
CN4
Front Keypad
CN15
Slave CPU connection
CN5
Printer
CN16
27VDC in
CN6
Misc
CN17
To LCD Backlight supply
CN7
Brigade Output
CN18
External Loop Communication
CN8
Modem [ RS232 ]
CN19
LCD Characters
CN9
External Buzzer Output
CN20
RS485 Communications Port 1
CN10
Slave CPU output 1
CN21
RS485 Communications Port 2
CN11
Main CPU
RV 1
C N 8
C N 6
S W 1
CN11
CN16
CN9
CN14
S W 3
CN15
CN13
CN17
LC
BACKLIGHT
SLAVE CPU2
FRONT PANEL
EXPANSION LEDS
MODEM
DEBUG
I/O PORT
27V IN
RESET
INTERNAL PRINTER
TO BRIGADE
PSU MONITOR
BOARD OR
SOUNDER BOARD
302-674E
NODE
ADDRESS
1
+
BRD85MBA TOP OVERLAY
CONTROL INDICATOR CARD
CN21
CN20
+
-
SLAVE CPU3
SLAVE CPU4
C N 2
C N 3
C N 4
BZ1
NOT USED
C N 5
C
N
7
C
N
1
0
ON BOARD
SLAVE CPU
CABLES TO
LOOP
TERMINATION
BOARD
RS485
C O M M S
EXPANSION BOARD
FOR 4 SLAVE CPU's
RS485 COMMS
CN1
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
O O O
a b c
ON
1
2
3
4
5
6
7
8
C
N
1
8
NETWORKING
LCD CONTRAST
ADJUST
NOT FITTED
Figure 20
: Main Board Layout with no Main CPU or Slave CPU’s
