Avid Technology Digidesign USD User Manual page 16

Keep in mind that Word Clock contains no
positional information; if you want devices
to play or record in sync, you'll still need to
provide them with a positional reference.
The USD can generate time code to provide
positional reference to other devices. See
"Generating and Regenerating Time Code" on
page 44 for more information.
Connecting AES/EBU Devices
To use AES/EBU clock reference:
Connect the device's AES/EBU output to
the USD's AES/EBU input.
IN L
L
T
T
BI-PHASE / TACH / GPI C
C
O
OUT I
U
N
T
PC SERIAL VIDEO REF MAC SERIAL VIDEO MTC OUT
Connecting the USD to an AES/EBU device
To supply AES/EBU clock reference from the
USD:
Connect the USD AES/ABU output to the
AES/EBU input on a DAT machine or other
digital device.
Connecting MIDI Devices
The USD MTC Out port provides MTC de-
rived from conversion (from LTC, VITC
and Bi-Phase) or MTC generation to syn-
chronize MTC-compatible consoles, se-
quencers, lighting systems and other de-
vices.
The MTC output from the MTC Out always
matches the time code address displayed
on the USD front panel.
12 Universal Slave Driver
AES out
AES in
85-264VAC, 47-63HZ, 115 W
A IN
A IN
E
E
S
S 9-PIN IN / ACC
O
I
U OUT OUT
N
T
WORD CLOCK 9-PIN OUT SUPER CLOCK (256X)
OMS, Pro Tools, and the USD
When a CPU is connected to the USD Mac
Serial port, Pro Tools does not need any ad-
ditional connections to facilitate MTC sync
or communication (it is handled through
the proprietary Mac Serial-to-DigiSerial
Port or modem/printer port connection).
With Pro Tools 4.1 and earlier, a MIDI In-
terface and OMS were required for
Pro Tools to recognize the USD as a "ge-
neric" synchronization device.
If you need to supply MTC from the USD to
another MTC-compatible device, connect
the device as described below.
To connect an MTC-compatible device to
receive MTC from USD:
Connect the USD MTC Out port to the
appropriate MIDI input on the device using
a standard MIDI cable.
MTC out To MIDI Interface input
Digidesign Universal Slave Driver
85-264VAC, 47-63HZ, 115 W
IN L A
L A IN IN
T E
T C E S
BI-PHASE / TACH / GPI C S 9-PIN IN / ACC
O O
OUT I I
U U OUT OUT
N T N T
PC SERIAL VIDEO REF MAC SERIAL VIDEO MTC OUT
WORD CLOCK 9-PIN OUT SUPER CLOCK (256X)
Connecting the USD MTC output to a MIDI Interface
input
Pro Tools and MTC
Pro Tools does not receive MTC from the
USD through its connection to the USD
Mac Serial or PC Serial port (see "Connect-
ing USD to a Computer" on page 7). The
signal does not include standard MIDI time
code, but is instead a high-quality, propri-
etary time code signal designed for
Pro Tools. Therefore, a MIDI Interface is
only required with Pro Tools version 4.1 or
earlier.
MIDI Interface
MIDI/MTC outputs