Studio Technologies 78 2004 - Manual (Page 12)

Issue 5, January 2004 Model 78/79 User Guide
Page 12 Studio Technologies, Inc.
for Surround
Connecting the Model 78 to
the Model 79
A cable with 9-pin D-sub plugs (males)
on each end is used to interconnect the
Model 78 Central Controller with the
Model 79 Control Console. A 20-foot (6.1-
meter) cable is provided with each system.
The connector labeled To/From Control
Console on the back panel of the Model 78
is used to connect to the Model 79.
Should a cable of different length be re-
quired, it should be wired in a one-to-one
fashion for all 9 pins. Pin 1 carries signal
common, and must be connected at both
ends. A shield connection for the cable
should be connected to pin 1 on the Model
78’s end. For best performance the cable
generally should not exceed 50 feet (15.3
meter) in length. The reality is that a cable
much longer in length should work correct-
ly, as long as an excellent-quality cable is
utilized. We define “excellent” as extensive
shielding along with very low capacitance.
The low cable capacitance is important
as it limits the amount of data-signal
waveform distortion. As far as an actual
maximum length, just test and see how far
away you can go—if it works, it works!
AC Mains Power
The Model 78 is internally configured to
operate from either nominal 100, 120,
or 220/240 V, 50/60 Hz. Units shipped to
North America are factory selected for
120 V operation. Units bound for Japan
are generally selected for 100 V, while
our friends “down under” and in Europe
receive units set for 220/240 V. Before
connecting the Model 78 to AC mains
power, check that it is configured to match
the local mains voltage. Look on the back
panel (adjacent to the power entry con-
nector) for the factory-configured voltage.
Note that an incorrect configuration could
prevent operation, or cause damage to the
unit. Should it be necessary to change the
unit’s operating voltage it must be per-
formed only at the factory, or by a factory-
authorized service technician.
The Model 78 uses an IEC-standard
connector to mate with the AC mains
cord. The wire colors in the AC mains
cord should conform to the internationally
recognized CEE color code and must
be wired accordingly:
Connection Wire Color
Neutral (N) Light Blue
Line (L) Brown
Protective Earth (E) Green/Yellow
Safety Warning: The Model 78 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.
Pin Signal
1 Shield
5 Remote Mute All
6 Remote Dim
7 Remote Input Select
9 Remote Control Common
Notes: 1) Connector type on Model 78 is 9-pin D-subminiature
female. Installer must provide plug (male). Connector
uses 4-40 threaded inserts for locking with mating plug.
Figure 6. Connector Pin Out for Remote Control
Inputs