IV. LED Signals
The Device is equipped with a bi-color LED that indicates the Device’s state. At power
on, the Device produce a single very short GREEN flash to indicate that power is
supplied.
1. Signals during normal operation
During the normal operation, the Device emits a four-flash sequence every 5 seconds.
When the engine is running, you should observe GREEN-GREEN-RED-GREEN or
four GREEN flashes.
The first flash in the sequence is GREEN if the signal strength is sufficient, and must be
RED if the engine is off. The second flash is GREEN if the quality of the signal is good.
If you are changing the speed, the first signal should remain GREEN, but the second
may change to RED during changes. Please, refer to Section III for details.
The third signal is GREEN if the Device receives messages listed at Appendix B (see
“Receive” column) from the NMEA 2000 network. Usually, this signal is RED and
changes to GREEN when you are opening the list of external devices or the list of
NMEA 2000 devices on a chart plotter or cycle the power of some NMEA 2000 device
in the network.
The fourth signal is GREEN if the Device sent something to NMEA 2000 (and the message
was received by another device or devices). This signal should be always GREEN, because
the Gateway sends periodic messages with engine data every 100 and 500 milliseconds
(see Appendix B). It can be RED in case of network error or when engine messages
settings are modified with YD:PGN or YD:ZERO_RPM commands (see Section VI).
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