19
H U I R E F E R E N C E G U I D E
DIGITAL CONNECTIONS
These outputs are designed for monitoring
purposes. We do not recommend mixing through
this output section due to the possibility of
feedback routing, and to the fact that smooth
fades, if applicable, may experience some “zip-
pering” inherent to digitally controlled amplifiers
(DCAs). Although these are high quality DCAs,
they are not volume smoothed (interpolated)
between their discrete volume levels. The volume
taper is mapped to resemble the taper of our
analog mixer rotary pots.
DIGITAL CONNECTIONS
MIDI
In order to operate, HUI must be connected
to a MIDI interface. The MIDI interface is in
turn connected to the external computer used
with your DAW.
Connect HUI to a MIDI interface by connect-
ing one MIDI cable between HUI’s
MIDI IN
port and the interface’s MIDI OUT port. Like-
wise, the other cable should be connected
between HUI’s
MIDI OUT
port and the
interface’s MIDI IN port. Now HUI and your
MIDI interface can talk to each other, compare
recipes, and share football scores.
RS-232/RS-422 Serial Port
To use HUI in conjunction with a computer,
run a cable with a 9-pin D-Sub connector from
HUI’s
SERIAL PORT
to the computer’s COM port.
The serial port on HUI bidirectionally trans-
fers data between a computer’s RS-232 or
RS-422 serial port and HUI. The only difference
between using the
SERIAL
and
MIDI
ports is the
rate of transmission of the data (the serial port
operates at 38.4K Baud and MIDI operates at
31.25K Baud) and the general physical hard-
ware (9-pin D-Sub vs. 5-pin DIN, respectively).
The actual data transferred is the same.
For RS-232: Pin 2=TXD
Pin 3=RXD
Pin 5=Ground
For RS-422: Pin 2=TX–
Pin 3=RX+
Pin 4=Ground
Pin 7 =TX+
Pin 8=RX–
Use the following serial communications
parameters when using the
SERIAL
port:
Baud rate: 38.4K
Parity: None
Data bits: 8
Stop bits: 1
Keyboard (computer)
You can “extend ” the use of your computer’s
keyboard by connecting the keyboard to HUI.
Simply connect a 4-pin ADB cable from your
keyboard to HUI’s
KEYBOARD IN
jack. Run
another 4-pin ADB cable from your computer to
HUI’s
KEYBOARD THRU
jack. Now your key-
board can be in closer proximity to HUI.
Note: This extra feature is not required in
order to use HUI — it is there as a convenience
to those who may need the extra length. The
ADB specification limits the ADB cable length
to 5 meters (about 16 feet).
Mouse
Similarly, you can extend the use of your
mouse (or trackball if you’re supremely cool) by
connecting it to HUI. Although most Apple
computers allow you to connect the mouse di-
rectly to the keyboard, some models have more
than one ADB connector on the computer. Using
a 4-pin ADB cable, connect one end to your com-
puter and the other to HUI’s
MOUSE THRU
jack. Then run another 4-pin ADB cable from
HUI’s
MOUSE IN
jack to your mouse or
trackball. (You’ll probably be using the cable
that is hardwired to your mouse — if you use a
trackball you’ll need a separate cable.)
You can use the MOUSE I/O to extend a sec-
ond keyboard/mouse to another computer,
which you might use for sequencing or some
other purpose.
A note regarding ADB port and MIDI com-
munication: HUI communicates with the host
DAW through the MIDI IN/OUT connectors.
The mouse and computer keyboard communi-
cate with the DAW through the ADB connectors.
The Mouse and Keyboard IN/OUT connectors
are wired straight-through, so there is no direct
interaction with the HUI, MIDI or SERIAL ports.
Even though both the HUI and the computer
keyboard have common modifier switches such
as SHIFT, OPTION, ALT, CONTROL, F-keys,
etc., the DAW determines how these keys oper-
ate and interact with one another. For example,
pressing the SHIFT/ADD button on the HUI in
conjunction with a mouse click may not work
the same as pressing the SHIFT key on the
keyboard in conjunction with a mouse click.
Expansion Port
This port is nestled on HUI’s backside for
use with future products.
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