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Chapter 4: Using SYNC I/O 37

Serial Time Code with MachineControl

MachineControl-equipped Pro Tools systems

can utilize serial time code through either of the

SYNC I/O 9-pin ports. When using Machine-

Control with serial time code as the positional

reference, SYNC I/O must be locked to a Video

Reference. In this scenario, SYNC I/O is set to

Generate mode to indicate that positional infor-

mation is acquired by Pro Tools directly over the

9-pin cable, not through SYNC I/O. Refer to the

MachineControl Guide for complete serial time

code information.

Video and Clock Reference

If you have only a single video source, and since

SYNC I/O uses different video inputs depending

on configuration, you may want to follow the

wiring tip below to ensure that you have full

functionality in all configurations:

To work with a single video source:

1 Connect the video signal to Video Ref In.

2 Run a short BNC jumper cable from the Video

Ref Out connector to the Video In connector.

3 Connect the Video Out signal to the video in-

put of your “destination” VTR or video editing

system.

The choice of video connector also matters

when choosing a positional reference. For in-

stance, when SYNC I/O is in Generate mode and

Video is the current clock reference, the time

code reference for the generator is always from

the Video Ref In connector. However, if you se-

lect a positional reference other than Generate,

then the signal at the Video In connector is

used.

Digital Clock

To resolve SYNC I/O to external AES/EBU, Word

Clock, or Slave Clock:

From Pro Tools:

■ In the SYNC Setup section of the Session

Setup window, select the appropriate digital

clock reference from the Clock Reference pop-

up menu.

From the front panel:

1 Press the Clock Reference switch to select

DIGITAL.

2 Press Set, and use the Up or Down switches to

display Digital Reference (dI6 rEF).

3 Press Set again. The LED Time Code Display

displays the current digital reference, which will

be:

• AES/EBU (AES-E8U)

– or –

•Word Clock (I CLOC)

4 Press Up or Down to select the digital clock

you want to use.

5 Press Set.

MachineControl also provides 9-Pin Deck

Emulation mode, but this mode is not sup-

ported through either of the SYNC I/O 9-pin

ports. See the Digidesign MachineControl

Guide for more information.

For more video signal information, refer to

“Video and VITC Signals” on page 67 in

Appendix A.

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