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Service manual CS3000
Chapter 3: Interface board KPK-2 3-40
The circuit boards of the central unit
Document no.:
S-4-007.875/E
Prepared:
1995-03-17 Fia
Revision:
R4 2004-03-15 BM
© 2002, Consilium Marine AB
1. DC/DC converter
The DC/DC circuit converts the battery voltage of the back plane to 5 VDC,
which is supplied to all logical circuits on the board. Should the voltage
disappear, a signal is activated in the back-plane. The DC/DC converter aslso
supplies the serial port drivers with electric isolated power.
2. CPU/Memory/Watch-dog
Contains processor, memory, watch-dog and digital circuitry to provide system
function.
3. LED Indications
The 5 V voltage and proper polling are indicated by green LEDs. Send and
receive for both the RS485 channels as well as send and receive for the RS232
channels are also indicated by green LEDs. The serial channels can also be
enabled/disabled by the CPU.
4. DUART circuits
Two of the DUARTs are for the RS232 channels and two is for the RS485
channels. All parameters, such as baud-rate, parity, etc., are programmable.
Contains processor two serial ports which is connected to the RS485
tranceivers. The DUART also control certain I/O on the board.
5. Fuse fault
The battery voltage is fused. If the fuse is blown a signal is activated in the
back-plane. The fuse is accessible on the front panel of the board, and can be
used for disconnecting the power.
6. & 7. RS232 adaptation
Adaptations of the signals from 5 V logic to RS232 logic and vice versa. The
signals from one channel are connected to a D-sub header on the front panel
and the other are connected to the back plane.
8. & 9. RS485 adaptation
Adaptations of the signals from 5 V logic to RS485 logic and vice versa. The
signals from both channels are connected to the back plane.
10. & 11. Buffers
The address bus, the data bus and the control signals are buffered before
entering the board.
12. Board address
Selects the board address.
13. RS232 D-SUB HEADER
Male 9-pin D-sub header on the front panel with IBM PC/AT pin-standard.