Pro Tools | SYNC HD Guide
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Pro Tools | SYNC HD Back Panel
Bi-Phase/Tach/GPI/Pilot
This is an accessory port for Bi-Phase, Tach, and
Pilot signals (specific cables are required for dif-
ferent applications). This connector is also used for
GPI input, output (including Fader Start), and thru
signals. This port handles up to 12 V Bi-Phase.
Video Reference
Receives a signal from a video source, such as a
black burst (house sync) generator or a standard
video signal.
Video Ref input can be used for clock reference, as
well as for frame-edge reference when synchroniz-
ing with 9-pin devices.
The following signal types are supported:
• SD (NTSC/PAL)
• HD (tri-level or bi-level) signal
The Video Ref ports are an un-terminated loop-
through that allows black burst or other video ref-
erence to be passed to another device. The second
port outputs whatever signal is present first port,
whether the SYNC HD is on or off.
When you connect a signal to one of these ports,
you must do one of the following:
• Connect a 75-ohm BNC terminator
(included with the SYNC HD) to the other
Video Ref port
• Make sure another terminated video device is
fed from the other Video Ref port.
Host Serial Port
The Host Serial port is a bidirectional (in/out) port
to connect the SYNC HD to the serial port on the
first HDX card in your system, or HD Native card
or HD Native Thunderbolt peripheral.
Figure 2. Pro Tools | SYNC HD Back Panel
Video Ref
Video In/Out
LTC In/Out
AES/EBU
In/Out
Word Clock
In/Out
Loop Sync In/Out
Bi-Phase/Tach
GPI/Pilot
Host Serial
MTC Out
9-Pin Out 1
9-Pin Out 2
AC Power
Refer to Chapter 8, “Wiring Diagrams and
Pin Assignments” for wiring information and
other specifications for this port.
If the SYNC HD is the last device in the video
sync chain, a 75-ohm BNC terminator must
be attached to this connector.
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