JRC JLN-900 Installation And Instruction Manual page 146

Green LEDs
8 green LEDs for internal voltage supervision are located at the upper edge of
the CPU board. In normal operation these 8 LEDs shall be lit.
4 red LEDs
4 red LEDs are controlled by the software, LED S1, S2, S3 and S4.
In normal operation, S1, S3 and S4 are lit, S2 flickers.
Red 2 x LED digits
Red 2 x LED digits display for diagnostic status. Code 00 shall be displayed
during normal operation, see 8.1 Supervision and diagnostic .
DIP 1-8
A set of 8 DIP switches are located on the CPU-board close to the upper right
corner. In normal operation these DIPs shall be set to: 1 and 5 = ON, the rest =
OFF. Note! ON = down.
NMEA inputs
Each NMEA input is supervised by a control LED. Whenever NMEA telegrams
are received the corresponding LED shall flicker.
NMEA outputs
Each NMEA output is supervised by a control LED. Whenever NMEA
telegrams are transmitted the corresponding LED shall flicker.
Opto and relay terminals
Each Opto and relay terminal is supervised by a control LED that is turned on
when the output is active.
Web interface
The built-in web interface has functions for trouble shooting such as a diagnostic
history list, and an NMEA display function with all incoming and outgoing
NMEA. The web interface can also remotely access the menu systems in the
Sig.Processor for the STW and SOG devices.
USB interface
A USB memory stick can be used to record incoming/outgoing NMEA traffic
for later analysis.
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