Studio Technologies 58 2000 - Manual (Page 18)

Model 58/59 User Guide Issue 4, December 2000
Studio Technologies, Inc. Page 19
for Surround
feature is active, the signal connected to
the bypass inputs is simply passed
through to the associated monitor output
channels by means of electromechanical
relay contacts.
Insert Sends and Returns
The connector labeled INSERTS is used
to interface with the two 2-channel insert
sections. Please refer to Figure 9 for
details on the exact “pin out” of the D-sub
connector. The use of the insert sections
will depend on the requirements of the
specific installation. In certain cases the
inserts sections won’t be required, and
no connections will need to be made.
The insert sends are electronically bal-
anced, have a nominal level of +4dBu,
and are capable of driving balanced or
unbalanced loads of 600 ohms or greater.
While balanced operation is preferred,
unbalanced operation is not a problem.
To connect to an unbalanced load connect
the + terminal of the D-sub as signal high,
and both the – and shield as the signal
low/shield. For optimal unbalanced opera-
tion, it is important to connect both – and
shield together directly on the D-sub.
Note that the insert sends do not have
level trim potentiometers associated with
them. The output levels are nominally
+4dBu, with channel-to-channel variation
of up to ±0.5dB considered normal. It is
anticipated that the equipment connected
to the insert sends will have, if required for
correct operation, input level adjustment
controls.
The insert returns are electronically bal-
anced, have a nominal input level of
+4dBu, and are compatible with balanced
or unbalanced sources. Connections
should be made in the same fashion as
the main inputs, described previously.
A trim pot is associated with each insert
return, allowing the input sensitivity to be
adjusted over a ±2dB range. Refer to the
Configuration section of this guide for
details on using the trim pots.
Remote Control Connections
The remote control input circuitry is physi-
cally located in the Model 59 Control
Console. Access to the remote control
inputs is by way of the 9-conductor cable
that links the Model 59 with one of the
Model 58 Central Controllers. In fact, five
of the nine connections in this cable are
dedicated for use by the remote control
inputs and have nothing directly to do with
the Model 58 Central Controller. Since all
pins of the Model 58’s 9-pin D-sub con-
nectors are connected in parallel, access
to the remote control inputs is made using
any of the available 9-pin D-subs on any of
the Model 58 units. Refer to Figure 10 for
a detailed description of the 9-pin D-sub
connections.
Contact input 1 and contact input 2 are
+5V logic signals which are active when
they are brought to the logic low state.
While the inputs are protected from over-
current and static (ESD) discharge care
should be taken to prevent nasty signals
from reaching them. To activate contact
input 1 simply connect pin 5 to data com-
mon, pin 4. To activate contact input 2
connect pin 6 to pin 4. The contact inputs
are active when held in the low state; they
can’t be configured to change states
(“latch”) in response to a logic pulse.
All that is required to add a remote level
control is to connect a commonly available
linear taper potentiometer. (Yes, use a
linear pot! Software in the Model 59