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Service manual CS3000
Chapter 3: Interface board RS232K-2 3-35
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.
2. Supervision
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.
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 and two
control signals for one of the RS232 channels are also indicated by green
LEDs.
4. Control logic
The address bus is decoded and selection signals for the two double serial
channels are generated.
5. & 6. Buffers
The address bus, the data bus and the control signals are buffered before
entering the board.
7. & 8. 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.
9. & 10. 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.
11. RS232 D-SUB HEADER
Male 9-pin D-sub header on the front panel with IBM PC/AT pin-standard.
12. & 13. 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.
14. Line protection
The line protector includes resistors for level definition of the line when not in
use. Line protection with zener diodes and varistors.