Operation
Page 56
Possible alarm conditions are listed Table 7.
Alarm
Description
TX Malfunction
This alarm will occur if the MMSI has not
been configured.
This alarm can also occur if the radio
hardware has failed to select the correct
frequency, that the output power is too low or
a transmitter shutdown has occurred.
In this situation, ALR 001 is output over the
PI.
The alarm will be cleared if the transmitter
recovers normal operation.
RX Channel
x
malfunction
This alarm occurs should the receiver
hardware malfunction. The receiver is
identified by the value of x (as shown below).
The following alarms will be generated over
the PI in this condition:
ALR 003 - Rx Channel 1
ALR 004 - Rx Channel 2
ALR 005 - DSC (Channel 70)
If the receiver returns to normal operation this
alarm will be cleared.
Antenna VSWR exceeds
limit
This alarm occurs if there is a problem with
your antenna or antenna connection.
External EPFS lost
This alarm occurs if the position from the
external Electronic Position Fixing System
(i.e. GNSS) is invalid or lost.
No valid COG information
This alarm occurs if the AIS transceiver has
no valid Course Over Ground information
from any connected sensor.
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