Studio Technologies 76 V.1.04 - Manual (Page 13)

Model 76/77 User Guide Issue 4, September 2008
Studio Technologies, Inc. Page 13
for Surround
carton as well as each “solo” Model 77.
These cables implement all nine connector
pins in a one-to-one manner.
When connecting one or two Model 77
units to a Model 76 all nine pins of the
interconnecting cables can be connected
in parallel (“multed”). This will connect the
data signals between the units and route
the Model 76’s 12 volt DC power source to
both Model 77 units. A basic cable imple-
mentation would have pin 1 (data+), pin 6
(data–), pin 4 (DC+), and pin 9 (DC–)
connected. Connecting to a third and
fourth Model 77 requires that only pin 1
(data+) and pin 6 (data–) be connected
from the Model 76 to the third and fourth
Model 77 units. (This will connect the “data
bus” from the Model 76 to all the Model
77 Control Consoles.) An external 12 volt
DC source must provide power to the third
and fourth Model 77. This power source,
capable of supplying a minimum of 200
milliamperes of current (100 milliamperes
per Model 77), needs to connect to pin 4
(DC+) and pin 9 (DC–) on the third and
fourth unit.
Previous paragraphs of this user guide
discussed the Model 76 to Model 77 cable
length issues. Please review that informa-
tion prior to creating the interconnection
scheme to be used for installing multiple
Model 77 units.
Confi guration
After the physical installation has been
completed it’s important that the system’s
confi guration options be carefully reviewed.
In most cases one or more of the operating
parameters will need to be revised to meet
the needs of a specifi c installation. Many
of the parameters will impact the signal
fl ow in to and out of the Model 76 Central
Controller. Other parameters affect how the
one or more Model 77 Control Consoles
will display status conditions and respond
to user commands.
Confi gurable Parameters
Many StudioComm functions can be
confi gured to meet the exact needs of an
installation. The Model 77 Control Console
is used to display and select the desired
system confi guration. Here’s an overview
of what can be confi gured:
• Model 77 Device Address
• Stereo Output
• Digital Input Reference Level
• Monitor Output Nominal Level
• Reference Level
• Overall Display Mode
• Reference Level in dB SPL
• Auto Reference Level Off
• Dim Level
• Remote Inputs
• LFE Downmix
• Channel Pop Solo Mode Offset Levels
The confi guration diagrams, located at the
end of this section, give details on set-
ting each parameter. An overview of each
confi gurable parameter is provided in the
following paragraphs.
Entering and Exiting the
Confi guration Mode
A small button is located on the back of
each Model 77 Control Console, adjacent
to the 9-pin D-sub connector. Pressing and
holding this button for two seconds places