Selecting Normal mode to start "pinging"
In order to transmit ("ping") you must set the ST90 to Normal operating mode. This is the default mode when the ST90 is turned on.
Context
The Operation function controls the operating mode of the ST90. You can set it to Normal, Replay or Inactive. Normal mode allows the ST90 to transmit ("ping") through the water, and to receive the echoes.
Caution
You must never start ST90 transmissions (pinging) when the ship is in dry dock. The transducer may be damaged if it transmits in open air.
Once started, the ST90 transmissions are controlled by the Transmission Mode and TX Power functions.
Procedure
1 Open the Operation menu.
2 Set Operation to Normal.
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The Operation function controls the operating mode of the ST90. Normal mode allows the ST90 to transmit ("ping") through the water, and to receive the echoes.
3 Set Transmission Mode to Maximum.
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The Transmission Mode function enables or disables the ST90 transmissions into the water. If you choose Maximum, the ST90 will transmit (ping) continuously and as often as possible. This gives you the maximum refresh rate.
The ping rate is normally limited by the maximum range settings. It will also be dependant on hardware issues. This may be, for example, how fast your Processor Unit can handle the information from each ping, how fast your system communicates with external peripherals, or how long time the system uses to save data.
4 Set Tx Power to Maximum.
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Result
The ST90 is now transmitting acoustic pulses ("pinging") into the water.