Figure 2.3a - The FF520 Optional Connections (II)
2.3.0NMEA Output
The following sentences are outputted: DPT and DBT (Depth), VHW (Speed), VLW (Trip Log), MTW (Water Temperature), XDR (External Sensor Temperature).
2.3.1Alarm Buzzer
This connection has the capability to drive a buzzer that draws 400mA. Any 12VDC buzzer within the current draw requirements can to be connected.
2.3.2Second temp sensor
Any thermistor type temp sensor that produces 10K ohms at 77 degrees F can to be connected.
2.3.3LED 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 boot loader, or DC power is not being supplied to the FF520.
·ON CONTINUOUSLY
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 connected to the GPS Chart Plotter and is operating correctly.
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