Cobalt Digital COMPASS 9345 Stereo Analog Audio to AES A_D Converter - Manual (Page 14)

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REF 2 Green
Second
from the
top
When on indicates that frame reference 2 is selected and the card is
locked to that signal. When flashing it indicates that REF 2 is
selected but the signal is missing or corrupted. (The card will
automatically switch to the internal reference and the internal
reference LED will turn on)
External Green
Third from
the top
When on indicates that external reference is selected and the card is
locked to that signal. When flashing it indicates that External Ref is
selected but the signal is missing or corrupted. (The card will
automatically switch to the internal reference and the internal
reference LED will turn on)
.
Internal Yellow
Fourth from
the top
When on indicates that internal reference is selected either through
dip switch selection or automatically and the card is locked to the
internal reference (see above)
CAL Red
Fifth from
the top When on indicates that the sampling frequency has changed and the
card is self calibrating (very short duration)
COM
Activity
Green
Sixth from
the top When on indicates that communications on the CAN bus is operating
properly
Table 1. Status LED Descriptions