Second Temp Sensor; Led Status Indicator; Power Connections - Standard Horizon FF520 Owner's Manual

2.3.2

Second temp sensor

Any thermistor type temp sensor that produces 10K ohms at 77 degrees F is able to be
connected.
2.3.3

LED Status Indicator

There are seven different LED behaviors, representing seven different diagnostic condi-
tions. These are described below.
· OFF
The FF520 is running in the bootloader, or DC power is not being supplied to the FF520.
· ON CONTINOUSLY
The transducer is not connected to the GPS Chart plotter or problem with cable of the
transducer cable..
· 1 LONG FLASH EVERY 2 SECONDS
The FF520 is not connected with the GPS Chart plotter.
· 1 SHORT FLASH EVERY 2 SECONDS
The FF520 is connected to the GPS Chart plotter and is operating correctly.
· 2 SHORT FLASHES EVERY 2 SECONDS
The FF520 is not operating as it is waiting for a commaned from the GPS chart plotter.
· 3 SHORT FLASHES EVERY 2 SECOND
A non-Standard Horizon transducer (without transducer ID) has been connected
· 4 SHORT FLASHES EVERY 2 SECONDS
No transducer connected.
2.4

POWER CONNECTIONS

It is recommended the installation of a switch and a (5A) fuse (not supplied) in the positive
DC supply to the FF520. The FF520 is designed to remain in stand-by even when the power
of the GPS chartplotter is turned off, this is the need for a switch so the vessels battery will
not be drained..
In the example below you will notice the positive DC power connection is run through a
switch and a fuse before connecting it to the FF520 and the GPS chartplotters.
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