Instruction manual

Cable layout
57
850-164696 / A
4.4 External triggering
Overview
Whenever more than one hydroacoustic system (echo sounder or
sonar) is installed on a vessel, interference may occur. To avoid
this, the systems may either be connected to a common
synchronization system, or one of the acoustic systems may be
defined as a “master”.
The EK60 echo sounder include interface for remote transmit
synchronisation. The system can be set up to operate in either
Master or Slave mode in relation to an external synchronization
or hydroacoustic system.
Extyernal synchronization may be connected to a serial port on
the Processing Unit or to the Auxiliary plug on the General
Purpose Transceiver (GPT).
Master system using the Auxiliary plug
When the EK60 system is set up to operate as a Master in a
system, the TrigOut signal from the GPT Auxiliary connector
must be connected to the external trigger input on the other
hydroacoustic system(s). Two TrigOut signals are available for
either positive or negative triggering.
Note Simultaneous transmission of more than one system can only
take place if the systems operate with different frequencies!
The TrigOut+ signal is an open collector output (max 100 mA)
containing a 100-kohm pullup resistor to +5 Vdc. This signal is
normally low. The TrigOut+ signal goes high when the
transceiver is ready to transmit, and it goes low again when all
frequency channels of the transceiver have finished transmitting.
TrigOut- is the inverse of TrigOut+.
Connect the ground wire to one of the Ground pins (18-22).
Slave system using the Auxiliary plug
If an external system is used to provide the transmit trigger, the
trigger signal must be connected to one of the TrigIn inputs on
the GPT Auxiliary connector. When activated. the trigger signal
from the external system will allow the EK60 system to
transmit.
Two TrigIn inputs are available for either positive or negative
triggering. The TrigIn - input is sensitive to a high-to-low
transition.