Kongsberg Simrad ST90, Reference Manual

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Tx Inhibit Hull Unit Position
If the transducer is activated when out of the water it may be damaged
beyond repair. With the transducer fully retracted, no transmissions
("pings") take place. When you lower the transducer into the water, you
can specify a vertical position for when the transmissions start. When the
transducer is retracted, transmissions will stop when the transducer reaches
the same position.
This functionality is only available if a hull unit has been activated in the
user interface.
Tx Inhibit Power
The high voltage supplied to the transceiver boards is monitored. You
are not permitted to change the alarm limits. If this voltage differs
from the defined tolerances, alarm message AKH11 will be initiated:
Transmission is inhibited due to a high voltage in the
power supply.
Tx Inhibit Operation Mode
This feature activates the system protection to make sure that the ST90
system does not transmit ("ping") when you have chosen
Replay or Inactive
mode.
Hull Unit
You must specify a maximum speed for the vessel. This speed can match the hull
unit specification, or you can choose a lower speed for increased safety.
Hull Unit Lowering depth (m) Maximum speed (knots)
ST92 1.2 21
ST93 1.6 16
ST94 2.1 11
Note
We strongly recommend that you do not specify a higher speed than the hull
unit is designed for.
If the speed limit is exceeded a message is issued by the ST90 system.
Operating procedures