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744T User Guide and Technical Information
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firmware v. 1.04 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
To avoid digital loops, when using the word clock and digital input signals, you must make the 744T the
word clock follower of the digital source.
C. Link – Multi-Unit Linking
The proprietary C. Link protocol (control link) allows multiple 744T’s and 722 recorders to be con-
nected and word clocked together. When linked, the 744T units have a master/slave relationship.
When the master recorder is put into record, the slave unit will roll as well. Multiple units can be
daisy-chained together to record many tracks. The C. Link protocol links carries the following data:
• word clock
• time code information
• RS-232 machine transport data
master
unit
slave
unit
slave
unit
To link units:
1. Connect multiple units as shown in the illustration above.
2. Set all linked recorders to the same sample rate, bit depth, fi le format, and time code frame rate (if
used). This will ensure that all fi les generated are compatible.
3. If time code is being used, set slave units to continuous jam mode so that they will follow the master
recorder’s time code generator.
4. Set scene and take numbers on all linked recorders to the same starting fi le name. There is no fi le name
synchronization with multiple unit linking.
When linked, record start and stop on slave units will not affect units “above” it in the
linked chain. This makes it possible for units to get out of synchronization if a unit other
than the master is set to record or stop. Using the master unit will assure that all machines
begin and end recording together.
The C. Link jack is a proprietary RS-232 port. Under no circumstances should analog or digital telephone
lines be connected to either jack. Serious damage could result.
Input-to-Track Routing
The 744T uses a simple, yet powerful routing scheme. The microprocessor-controlled matrix allows
any input to be routed to any track. Multiple inputs can be routed to a single track to create mono-
mixed recordings.
The 4 by 4 blue LED matrix makes it easy to check your current routing at a glance. A solid blue LED
indicates an input is assigned to a record track.