Chapter 6: Features And Controls; Front Panel; Power Switch; Front Panel Leds - Alesis AI-2 Reference Manual

CHAPTER 6: FEATURES AND
CONTROLS

6.0 FRONT PANEL

The AI-2 front panel has a power switch, eight status LEDs, six
function keys and a two row, sixteen character Liquid Crystal display
(LCD) with an orange backlight. The status LEDs are used to give
continual user feedback of the AI-2 operating state. When the LEDs
are on, the AI-2 is operating correctly, if problems are encountered,
they are indicated by flashing LEDs. The keys are used to control
AI-2 functions and the display, to give detailed information and
provide access to the AI-2 setup mode options.

6.1 POWER SWITCH

The power switch is used to isolate the external 10 volt AC supply.
The AC supply is a standard Alesis P3 wall mounting transformer
with a 3.5 mm barrel jack. Power on indication is provided by the
LED backlight, which is always on when power is present.

6.2 FRONT PANEL LEDS

The AI-2 has eight status LEDs that provide the user with contin-
uous information about the time code, reference source and
communications status for the controlling devices and connected
ADATs. The LEDs flash to indicate error conditions.
ONLINE LED. Lights when the ONLINE switch is pressed.
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When the AI-2 is online, external control commands and
changes in time code position, if in time code chase, will be
communicated to the connected ADAT transports. When the
AI-2 is offline, the AI-2 does not control the transports and will
report offline status to the controller.
LOCK LED. Lights when all the connected ADATs are playing
•
and correctly synchronized. The LOCK LED is a true lock tally
and only comes on when all the ADAT transports are locked. In
time code chase operation, the LOCK LED will flash if a lock
error greater than 25 subframes occurs after initial lock, such as
a code drop out or edited time code.
NON STD LED. Lights when the AI-2 digital audio sample rate
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is not set to 48.000 KHz. A sample rate of 48 KHz is both the
ADAT and Broadcast standard. The NON STD LED is also
used to indicate that system errors or changes have occurred.
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