Studio Technologies 76 V.1.04 - Manual (Page 12)

Issue 4, September 2008 Model 76/77 User Guide
Page 12 Studio Technologies, Inc.
for Surround
confi guration could prevent operation or
cause damage to the unit. Should it be
necessary to change the unit’s operating
voltage it must be performed only at the
factory, or by a factory-authorized service
technician.
The Model 76 uses an IEC-standard C14
inlet connector to mate with the AC mains
cord. The AC mains cord should have a
C13 socket affi xed with the wire colors
conforming to the internationally recog-
nized CEE color code:
Connection Wire Color
Neutral (N) Light Blue
Line (L) Brown
Protective Earth (E) Green/Yellow
Safety Warning: The Model 76 does
not contain an AC mains disconnect
switch. As such, the AC mains cord
plug serves as the disconnection
device. Safety considerations require
that the plug and associated outlet
be easily accessible to allow rapid
disconnection of AC mains power
should it prove necessary.
As soon as AC mains power is applied,
the Model 76 Central Controller’s power
LED will light steadily. The control con-
sole data activity LED may also light. The
one or more connected Model 77 Control
Consoles will go through a power-up se-
quence, lighting each LED in succession.
Using its 4-digit display, each Model 77 will
also momentarily display its address, it’s
software version, and the software version
of the associated Model 76.
Advanced
Installation
Additional Model 77 Control
Consoles
Some installations will benefi t from the
Model 76’s ability to be controlled by up
to four Model 77 Control Consoles. In
this section details on how to connect
additional Model 77 units will be reviewed.
While control of one Model 76 by up to
four Model 77 units is fully supported,
one limitation does exists. A Model 76
Central Controller is capable of providing
DC power for only one or two Model 77
units. Connecting a third or fourth Model
77 requires use of a separate source of
12 volt DC power. As each Model 77 unit
requires a maximum current of only 100
milliamperes, obtaining an external power
supply should not prove to be an issue.
Many low-cost external “wall wart” 12 volt
DC power supplies are available that will
be suitable to the task. For best operation
they should be a “switch-mode” type with
a fi ltered and regulated output.
As covered in a previous section of this
user guide, a 9-pin female D-subminiature
connector, labeled To/From Control Con-
sole, is provided on the back panel of the
Model 76 Central Controller. This is pro-
vided to interface the Model 76 with up to
four Model 77 Control Consoles. A 9-pin
D-sub connector, labeled To/From Central
Controller, is provided on the back panel
of each Model 77 Control Console. A cable
with 9-pin male D-sub connectors on each
end is used to interconnect each Model 77
with the Model 76. A 20-foot (6.1-meter)
cable is included in the main shipping