Operation Manual

M-2 AIS Operation Issue 1 49
Alarm Messages
The transponder may generate various alarm and information messages that
appear as pop-ups on the display. Messages categorised as "alarms" also
cause the transponder to generate an audible or visual alarm (depending on the
installation) and must be acknowledged on the display unit in order to clear the
alarm. Messages categorised as "information" do not require any specific action
and the pop-up window on the display unit will automatically disappear after 30
seconds. All these messages are stored in the "alarms list" that can be viewed
on the "Alarm mode: Alarms log" page on the M-2 display unit.
The messages which may appear are listed in numeric order.
Tx malfunction (Alarm 01)
This indicates that there is a problem with the transponder. The occasional
occurrence of this alarm may be caused by transient conditions and does not
necessarily indicate a permanent problem. However, if this alarm occurs on a
regular basis you should take action to have your installation checked by an
authorised service agent.
Antenna VSWR exceeds limits (Alarm 02)
This indicates that there is a problem with the antenna. The transponder is likely
to be still operational, although its performance may be impaired. The
occasional occurrence of this alarm may be caused by transient conditions and
does not necessarily indicate a permanent problem. However, if this alarm
continues to occur you should take action to have your installation checked by
an authorised service agent.
Rx Channel 1 malfunction (Alarm 03)
Rx Channel 2 malfunction (Alarm 04)
Rx Channel 70 malfunction (Alarm 05)
These messages indicate that there is a possible problem with the receiver for
AIS channel A, AIS channel B or the DSC channel 70 respectively. Again, the
occasional occurrence of this message should not be cause for alarm, but the
regular occurrence of these messages is likely to indicate a permanent problem
which should be investigated by an authorised service agent.
Transceiver connection lost (Alarm 08)
This message indicates that the M-2 display unit can no longer communicate
with the M-2 transponder. This may indicate a problem with the connections, or
may indicate that the transponder is no longer operating correctly. This fault
should be investigated immediately. It is important to note that there is a safety
timer in the transponder which causes it to shut down automatically if the
transmitter should remain on for too long. In this event, the transponder will shut
down and this alarm will be raised by the display unit. The situation can be
resolved by disconnecting the power from the transponder for a short time and
then re-connecting it again.