dCS Scarlatti DAC
User Manual
Software Issue 1.2x
August 2011
Flename: Scarlatti DAC Manual v1_2x.docx
Page 17
English
version
Word Clock Input / Output
The
WCLK In
connector (R) will accept standard word clock from the source equipment or a master
clock at 32, 44.1, 48, 88.2, 96, 176.4 or 192kHz. The clock frequency
MUST
be an exact multiple of
the data rate, otherwise the system will not lock. Use the
Sync
button to lock the DAC to the external
word clock. Note that the source
MUST
be locked to the same clock, otherwise the system will not be
locked and periodic clicks will be heard on the outputs.
When the unit is set to Master mode, the DAC uses its internal clock instead of locking to the data or
WCLK In
put, and the
WCLK Out
connector (S) carries a 44.1kHz word clock. This
MUST
be
connected to the source equipment, so that the system can lock.
Word clock is used for synchronisation only, it does not carry digital data.
1394
Interface
The IEEE 1394 interface (T) will accept encrypted DSD data from the
Scarlatti
Transport or
Upsampler, as well as from other
dCS
transports and upsamplers that are loaded with current
software. 1394 interfaces are great for carrying lots of digital data - but are very poor at transmitting a
stable clock, so a separate Word Clock connection is required. The two 1394 ports are identical – they
can be used as data inputs or as a loop-through. Note that the 1394 bus must not be connected in a
loop as this will prevent the system initialising.
SUC
Connector
The
SUC
connector (U) is an RS232 interface, primarily used to remotely control the unit during
automated testing. Please contact
dCS
for advice on using this interface with a household automation
system. Note that we recommend using infra-red remote control instead.
Mains inlet
Power is connected via a standard IEC320 connector (V), protected by a fuse (W) and isolated by a 2-
pole power switch (X).
