Specifications

55
6.3.10 Alarm Connection
Below picture shows where to connect external Alarm to MX535B
# In/Out Type Usage Name
37 Out Relay (NO) Alarm ALARM_A
38 Out ALARM_B
In this configuration, both the external relay and the alarm unit are powered from external power source,
and the alarm unit is grounded through the external relay if an alarm occurs or the main power to the AIS is
removed or if the MX535B would become defective.
Other configurations may be used, but remember that the Alarm must function both on AIS Alarm
conditions and power failure
to the AIS.
The Alarm relay is a normally open earth free relay contact, provided as an independent and simple
method for triggering an external alarm. The alarm relay is active in case of power off and is capable of
driving a 2 A current. The maximum voltage over the alarm relay must not exceed 48 V. The alarm relay is
deactivated upon acknowledgment of an alarm, either internally on the display unit, or by an externally
provided ACK sentence. If the Transponder power is lost, and the Alarm relay has power, the alarm will
be triggered. In this case, the only way to deactivate the Alarm is to p
ower the Transponder unit or
disconnect the power source of the Alarm relay.
Figure 6.17 Typical Alarm connections