Specifications

Page 17
FIREFINDER SERIES II INSTALLATION, COMMISSIONING &
OPERATION
4.10 Main Board
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 (not used)
CN12
LCD Graphic
CN2
Expansion Panel (not used)
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 (not used)
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
RV1
CN8
CN6
SW1
CN11
CN16
CN9
CN14
SW3
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 CPU3SLAVE CPU4
CN2
CN3
CN4
BZ1
NOT USED
CN5
C
N
7
C
N
1
0
ON BOARD
SLAVE CPU
CABLES TO
LOOP
TERMINATION
BOARD
RS485
COMMS
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 16: Main Board Layout with no Main CPU or Slave CPU’s