Alesis AI-2 Reference Manual page 50

Interface device for the alesis adat 8-track digital audio tape recorder
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When a new message is added to the AI-2 error stack, the NON
STD LED will flash. The messages can be viewed by pressing
the STORE key and each time the STORE key is pressed the
next message in the stack is displayed. When all the messages
have been read, the stack is cleared and the LED stops
flashing.
BRC/ADAT LED. Lights when valid communications are taking
place between the AI-2 and the ADAT transports, or the AI-2
and the BRC. This LED will flash when communication errors
occur. A communications error could be either bad data or an
unrecognized message.
MMC LED. Lights when valid communications are taking place
on the MIDI IN control port on the rear panel. This LED will
flash when communications errors occur. A communications
error could be either bad data or an unrecognized MIDI
message.
CONTROL LED. Lights when valid communications are taking
place on the selected control port, either the RS422 editor port
or the LYNX-2/MICRO LYNX synchronizer connector. Errors in
the control communications will cause the LED to flash. A
communications error could be either bad data or an
unrecognized serial message.
REF LED. Lights when the selected external reference source
is present and providing a valid reference signal. The REF LED
remains off, if an internal reference is selected. The possible
external references are video, word clock and time code. If the
selected reference (internal or external) is not present, has lost
lock or is determined to be of an unsuitable frequency, the REF
LED flashes.
The LTC LED. Lights when there is valid time code being
received at the time code reader input.
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