5
SETUP (CONNECTIONS & SETTINGS)
S
ECTION 4
This section discusses a multitude of things, all related to getting signals in and out of the 8824
and getting on with using it.
ADAT Sync Connections
These connectors allow sending and receiving ADAT-specific information between daisy-chained
ADAT machines or other hardware capable of sending or receiving ADAT Sync. The ADAT sync
cable carries machine control, word clock, and timecode signals. These connectors, or the MIDI
connectors, may be used for controlling the 8824. The only signal in the ADAT sync connection
that matters to the 8824 is the machine control signal.
Note If you are using the 8824 with the Alesis PCR card, the 8824 must be the first device
connected after the PCR card. Doing so ensures that the 8824 can always receive
commands (ADAT machines do not always pass ADAT Sync information through
themselves.)
Lightpipe Connections
The lightpipe connectors accept TOSLINK fiber-optic cables. There are two such connectors; one
for input, one for output. The optical signal at these connectors represents all eight channels.
Connect the lightpipe connectors to and from your computer’s lightpipe interface card. There is
no provision within the unit to operate the lightpipe connectors in thru mode.
MIDI Connections
The MIDI connectors receive or send MIDI data. These connectors, or the ADAT Sync
connectors, may be used for controlling the 8824.
Note If you use the MIDI connectors, it is preferable to use a separate MIDI port on your
computer (i.e. one that depends on a different IRQ than the lightpipe interface).
Analog I/O Connections
It is not necessary to connect to any or all of these connectors at any given time. The connectors
used or not used depend on your specific application. In most situations, connect the sources and
destinations that you do have to the 8824. You can then use it as a ‘router’ to patch your sources,
destinations, and the computer workstation software together.
Connect your analog sources to the rear-panel analog input connectors. These connectors may be
driven from a balanced or unbalanced, low-impedance source. When using an unbalanced source,
the preferred connection method is to bring all three input connections through to the unbal-
anced source, tying the shield to the source ground, pin 2/hot to the source hot, and pin3/cold to
the source ground.
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