Studio Technologies 68A 2001 - Manual (Page 13)

Model 68A/69A User Guide Issue 1, March 2001
Studio Technologies, Inc. Page 13
for Surround
static (ESD) discharge, care should be
taken to prevent nasty signals from reach-
ing them. The inputs are active only when
held in the low state; they can’t be config-
ured to change state (“latch”) in response
to a logic pulse.
The connector labeled Remote Control
Inputs on the back panel of the Model 68A
is used to interface with the remote control
inputs. Refer to Figure 7 for exact connec-
tion details. Note that pin 1 (Shield) and
pin 9 (Remote Control Common) are
electrically identical. In addition to con-
necting to system common, they connect
to the Model 68A’s chassis and mains
earth connection. For convenience, the
shield of the interconnecting cable should
be connected to pin 1 (Shield), while the
return signals of the remote control
sources should connect to pin 9 (Remote
Control Common).
Note that although the remote control
connections are physically made to the
D-sub on the Model 68A’s back panel, the
remote control input circuitry is actually
located in the Model 69A Control Console.
Conductors in the cable linking the Model
68A to the Model 69A route the remote
control signals to the actual input circuitry.
Connecting the Model 68A
to the Model 69A
A cable with 9-pin D-sub plugs (males)
on each end is used to interconnect the
Model 68A Central Controller with the
Model 69A 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 68A is used to connect to the
Model 69A.
Should a cable of different length be
required, 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 68A’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 correctly, as long as an excellent-
quality cable is utilized. We define “excel-
lent” 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 68A is internally configured
to operate from either nominal 100, 120,
or 220/240V, 50/60Hz. Units shipped to
North America are factory selected for
120V operation. Units bound for Japan
must be selected for 100V, while our
friends “down under” and in Europe
Pin Signal
1 Shield
5 Remote Mute All
6 Remote Dim
7 Spare Remote Input
8 Remote Input Select
9 Remote Control Common
Notes: 1) Connector type on Model 68A is 9-pin D-subminiature
female. Installer must provide plug (male). Connector
uses 4-40 threaded inserts for locking with mating plug.
Figure 7. Connector Pin Out for Remote
Control Inputs