ACR&Artex PathFinder3 SART - Manual (Page 11)

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When activated the SART has three modes of
operation:

Receive - waiting for a valid interrogation by a
radar signal.

Reply - replying to a valid interrogation by a
valid radar signal.

Test - self-test sequence that checks both
indicator lights and the buzzer.
WARNING: The SART must only be
activated in situations of grave and
imminent danger.
Figure 5