Kongsberg K-Sync, Installation Manual

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The feedback signals communicate whether an echo sounder is ready to be triggered,
and if transmit occurred.
When the
Ready To Transmit
signal is active, the Synchronizing Unit can trigger the echo
sounder. Once the ping cycle starts, it is required that the signal go inactive. Once ping
cycle is complete and echo sounder is ready again, the signal must once again become
active. It also works well if echo sounders keep this signal inactive when they are not
configured for external pinging as they will instantly be placed into standby mode.
The
Transmitting
signal goes active at the instant when the transmit pulse starts. It is not
required that the pulse length of this signal is the same as the transmit pulse itself.
If the signal is available, the trigger display will show a red pulse whenever the echo
sounder transmits. Even if the echo sounder is not controlled by the Synchronizing Unit,
a red pulse will appear whenever the transmitting signal is set by echo sounder.
Note
The red visualization of the pulse is not identical to the actual pulse.
If an echo sounder fails to transmit three times in a row upon being triggered, the echo
sounder will assume that the echo sounder is no longer available. The echo sounder is
assumed to not be responding if it has not transmitted within 512 ms of trigger. In this
case it will be put into standby and the system will not be triggered by the Synchronizing
Unit until the operator disables and re-enables the system in echo sounder status.
Trigger output to the echo sounder
The trigger output is a pulse generated by the Synchronizing Unit to signal the echo
sounder to ping. The pulse width can be specified in 1 ms increments.
Note
There are wide differences among echo sounders in their implementation of the signal
interface. Consult the product manual for the individual systems for specific information
on timing and signal specification.
Logic states and their corresponding voltage
levels
Note
In this manual Signal active refers to a particular voltage level which is present for a
specific state, but does not imply whether this voltage is negative, 0 or positive. Using
this generic terminology avoids confusion. For example, RS-232 signals that are between
-12 and -3 V is considered a logic "high" and +3 to +12 V is considered a logic "low."
KONGSBERG K-Sync Installation manual