ArcSystem fixtures, including D1 drivers, have 2 primary indicator lights: STATUS and LINK.
LINK blinks slowly when the fixture is communicating to a TX-1 wirelessly. It goes solid when the fixture is receiving wired DMX data. It will be off when there is no data to the fixture.
STATUS blinks to indicate that the fixture’s CPU is functioning correctly. If the STATUS LED is off or solid on, contact ETC Technical Services.