USL, Inc.
JSD-80 Instruction Manual
Page 18
3rd Edition. February, 2006
6.3 Back Panel Signal Output
Connections
Main Outputs
These are the main processor outputs
to connect to the power amplifi ers. The
outputs are balanced, and all have a cor-
responding ground terminal. Use two-con-
ductor shielded cable for each channel.
The shield should usually be connected to
ground at the power amplifi er end only.
Monitor Outputs
This is a 25-pin D-type connector containing
the line output signals for all eight channels.
It can be connected directly to any Ultra
Stereo “CM” series monitors. The pinout for
this connector is in Section 12.
Hearing Impaired Output
This line-level output is the sum of the
left, center, and right channels. It can be
connected to an “Ultra Phonic” or other
hearing impaired system. Output level is
approximately 300 mV.
Back Panel Automation Connections
Automation Inputs (Phoenix Connector)
These are active low-contact closure inputs
to remotely trigger the JSD-80. There are
nine automation inputs; one for each of the
eight JSD-80 operating formats, and a “Mute”
input. These are intended to be momentary
contact closures. The “Mute” function is
released by selecting (or re-selecting) one
of the main input formats.
The Automation common terminal is iso-
lated from the system ground through an
internal 10 Ohm resistor to minimize ground
loop problems.
Note: When wiring the automation in-
puts, use the Com terminal, not a ground
terminal.
Automation (DB-25)
This 25-pin D-type connector contains most
(not all!) of the automation input and output
signals. The pinout for this connector is in
Section 12.
Note: An adapter is available to convert
to the DTS automation pinout (DTS-6D).
LEDs for monitoring the status of the JSD-80
can be connected in series with a 1k resistor
from +5 V at pin 13, to any of these outputs.
See Section 12.
Bypass Power Input
The JSD-80 uses an external 16 V AC @
500 mA power supply to power the bypass
circuit.
Remote Fader Input
Two normally open switches can be used
to implement a remote fader. One button
increases level, the other decreases level.
The range is limited to 4.0 - 9.0 on the main
fader. See Section 10.3.
Changeover
The JSD-80 includes dual preamplifi ers for
use in two-projector changeover systems.
Connecting the “XO” terminal to “Common”
mutes the Projector 1 input and selects
Projector 2. This must be a maintained
closure.
RS232 Port
A standard 9-pin D-type connector connects
to a host PC computer. The cable should
be a standard male to female “straight
through” type. The port also can be used
for remote fader and automation functions.
See Section 12.
