Installation manual

Simrad SP90

851-164510 / Rev.E

8.6 Trawl system connection

The SP90 sonar can read the trawl data from a Simrad FS Trawl

sonar or ITI (Integrated Trawl Instrumentation) system. The

communication is achieved using a RS-232 serial line.

When connecting the FS Trawl sonar to the SP90 Sonar

Interface Unit the trawl depth will automatically be shown in

accordance with the surface, targets and bottom in the vertical

modes on the sonar.

When the ITI trawl system is connected to the SP90 sonar, the

information exchanged between the ITI and sonar is:

ITI to sonar:

• Trawl position relative to vessel

• Depth of trawl below surface

• Trawl headrope to footrope distance

• Trawl door spread

• Trawl filling

• Water temperature at trawl

Sonar to ITI:

• Position of target or marker

For connection to the trawl system, refer to the RS-232 output

in the applicable trawl system documentation.

References

→ Serial line interface, cable drawing, page 191