Studio Technologies 591 - Manual (Page 12)

Model 58/591 User Guide Issue 1, September 1999
Studio Technologies, Inc. Page 15
Remote Control Connections
The remote control input circuitry is physi-
cally located in the Model 591 Control
Console. Access to the remote control
inputs is by way of the 9-conductor cable
that links the Model 591 with the Model 58
Central Controller. 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 two 9-pin D-sub connectors
are connected in parallel, access to the
remote control inputs is made using the
connector labeled “Loop Thru” on the
Model 58. Refer to Figure 7 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 591
Control Console converts its performance
to logarithmic.) Any high-quality pot with a
nominal “coil” resistance of between 1k
and 25k ohms should work fine. Simply
connect the “Loop Thru” D-sub to the pot
in this fashion: Pin 7 to counterclockwise,
pin 8 to wiper, and pin 9 to clockwise. As
very little current (amps) travels through
the wiring and pot, there is really no practi-
cal maximum cable length. Be aware that
the longer the cable run, the more chance
that an accidental short circuit could take
place. This is a serious issue, as a short
circuit could cause the monitor output level
to go to maximum.
Warning: Connecting to the remote
level control input requires very careful
attention to wiring and potentiometer
connections. Shorting pin 8 of the 9-pin
D-sub connector to common will raise
the monitor output level to maximum!
To address hearing safety issues, the
Model 591 is default configured to
disable the remote level control input.
A safe and reliable installation must be
completed prior to enabling the input.
Pin Signal Direction
1 Power Supply Common, Model 58 unit to
Cable Shield Model 591
2 +15Vdc Model 58 unit to
Model 591
3 Data Model 591 to
Model 58 unit
4 Data Common Model 591 to
Model 58 unit
5 Contact Input 1 Remote Contact to
Model 591
6 Contact Input 2 Remote Contact to
Model 591
7 CCW Remote Level
Potentiometer to Model 591
8 Wiper Remote Level
Potentiometer to Model 591
9 CW Remote Level
Potentiometer to Model 591
Notes: 1) Connector type on Model 58 is 9-pin D-subminiature
female. Connector uses 4-40 threaded inserts for
locking with mating plug.
Figure 7. Connections for Control Console and
Remote Control Inputs
Level
Control