76
451253/A
External synchronization
The SBP 29 CPU RIO have two connections for external synchronization.
One connection is dedicated for synchronization with the EM 124 or EM 304, and the
other is for interface to an external synchronization system, for example K-Sync. An
external synchronization system is used when multiple echo sounders are employed
on the same vessel.
This is an optically isolated connection that requires ~10mA current. Input power and
resistor value must be adjusted accordingly. The connector is RJ45 type.
RJ45 connector pin layout
External synchronization signal characteristics
Signal
Description
Type
Active
RTT
Rready To Transmit -
Output from SBP 29
when it is ready for the
next trigger pulse
Open collector output
from isolation unit
High
TRIG OUT
Trigger out -
Output to external
synchronization system,
active while the SBP 29
is transmitting
Open collector output
from isolation unit
Low
TRIG IN
Trigger in - Input to
SBP 29 enabling it to
transmit
Optical isolated input
High
Note
To avoid ground loops and damage of the electronics caused by external connections, all
connections are optically isolated.
SBP 29 Installation Manual
Summary of Contents for SBP 29
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