Kongsberg Simrad ST90, Reference Manual, Page: 213 / 690

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The ST90 system operates using its internal ping interval parameters, independent
of any trigger signals arriving at the synchronization port.
The
Synchronization Delay
setting is not applicable when synchronization is
switched off.
• Master
Master mode is used if the ST90 system is going to act as the controlling unit in a
synchronized system. The peripheral hydroacoustic system(s) are only permitted
to transmit when enabled by the ST90 system. When
Master mode is selected, the
ST90 system will run using its internal ping interval parameters and send trigger
signals to the peripheral system(s).
This mode is unavailable if you set
Synchronization Port
to Transceiver Auxiliary
Port .
• Slave
The Slave mode is used if the ST90 system shall transmit only when permitted by
a peripheral system. When the Slave mode is selected, the ST90 system will not
transmit ("ping") unless an external trigger appears on the chosen synchronization
port. The peripheral system may be any other hydroacoustic product (for example
an echo sounder or sonar), or even a dedicated synchronization system.
7 Select
Synchronization Delay
.
This delay parameter is used differently depending on the chosen synchronization mode.
• Stand-alone
The
Synchronization Delay
setting is not applicable when synchronization is
switched off.
• Master
In Master mode, the ST90 system waits for the delay time after the external trigger
signal has been sent to the slaves before transmitting the ping. This is often referred
to as a
pre-trigger .
Note
This delay will only work when the synchronization is set up using a serial port.
• Slave
In Slave mode, the ST90 system waits for the delay time after the external trigger
signal has arrived before transmitting the ping. This is often referred to as a
post-trigger .
8 From the list of ports available, select
Synchronization Port
.
Maintenance procedures