ETC Obsession User Manual page 269

Chapter 21 Accessories
LEDs
Two LEDs labeled A and B are located in the upper left corner of
the Remote Console's face panel and on the DMX switcher's face
panel. The LED for the main processor is lit. The LED for the
backup processor is off.
A processor is main
B processor is main
Tracking off
Tracking off,
and control manually
switched to A processor.
Tracking interrupted,
A is main
Tracking interrupted,
B is main
Remote console DMX Switcher
A LED B LED A LED
on off
off on
off off
off off
blink off
off blink
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B LED
on off
off on
off on
on off
on off
off on