Installing the Towfish
SeaKing Sidecan Sonars
0374-SOM-00013, Issue: 01
20
© Tritech International Ltd.
Tritech Waterblock
Pin
Function
Cable colour
1
ARCNET A
RS232 TX
Yellow
2
ARCNET B
RS232 RX
Blue
3
DC +
Red
4
DC -
Black
5
RS232 Ground
Green
6
Earth/cable shield
cable screen
Note
If communicating using the ARCNET protocol it will be necessary to have
resistors fitted at each end of the cable. For more details please refer to
Appendix A,
ARCNET Termination
for more information.
6.3. Power
The SeaKing Towfish range of sensors are designed to work over a smoothed DC
power supply over the range specified in Chapter 3,
SeaKing Towfish
.
Caution
Never try to make the Towfish work over a longer cable by increasing
the voltage above the maximum specified, doing so may cause permanent
damage.
If using a rectified transformer PSU the output must have a filter capacitor of at least
470μF for each head that is being powered. The use of unregulated power supplies
is not recommended.
If powering the head down a long lead or umbilical, the maximum recommended
loop resistance of the power line must not exceed 10Ω.
If the supply voltage is less than the minimum specified in Chapter 3,
SeaKing
Towfish
the Towfish is unlikely to work correctly.
Ground Fault Monitoring Equipment
The power supply within all SeaKing devices includes an electrically
isolated DC to DC converter front end with a small capacitive connection
made to the sonar chassis. This should not noticeably affect any impressed
current Ground Fault Interrupter (GFI) or Residual Current Devices
(RCD).
