Studio Technologies 76 V.1.10 - Manual (Page 10)

Issue 7, August 2012 Model 76/77 User Guide
Page 10 Studio Technologies, Inc.
for Surround
exact connection details. Note that unlike
a DA-88-style assembly, the Model 76’s
D-sub connector uses 4-40 threads. This
complies with the original design standard
for D-subminiature connectors.
Remote Control Inputs
Support is provided for two remote con-
trol input functions: remote mute all and
remote dim. The inputs use logic gates,
“pulled up” to +5 volts DC by way of resis-
tors, which are active whenever they are
brought to their logic low state. Inputs of
this type are commonly referred to as
GPI inputs. While the input circuitry is pro-
tected from over-current and static (ESD)
discharge, care should be taken to prevent
nasty signals from reaching them. The
inputs are active only when held in the low
state; they can’t be configured to change
state (“latch”) in response to a logic pulse.
A 9-pin female D-subminiature connector
is used to interface with the remote control
inputs. This connector, labeled RS-485/
Remote Control Inputs, is located on the
back panel of the Model 76. Refer to
Figure 5 for the exact connection details.
Note that pin 4 (remote input common)
connects to the Model 76’s internal cir-
cuit common connection as well as the
Model 76’s chassis and mains earth con-
nections. Figure 5 also shows two spare
remote control inputs (pins 8 and 9). These
are provided for future applications and
should remain unconnected. This connec-
tor also allows access to an RS-485 data
interface. This interface is not supported in
the Model 76 and, as such, pins 7 and 2
should remain unterminated.
Connecting the Model 76 to
the Model 77
A 9-pin female D-subminiature connector,
labeled To/From Control Console, is pro-
vided on the back panel of the Model 76
Central Controller. This is used to interface
the unit with a Model 77 Control Console.
A 9-pin female D-sub connector, labeled
To/From Central Controller, is provided
on the back panel of the Model 77 Control
Signal Signal
Connections High (+) Low (–) Shield
Surround L 24 12 25
Surround R 10 23 11
Surround C 21 9 22
Surround LFE 7 20 8
Surround LS 18 6 19
Surround RS 4 17 5
Stereo L 15 3 16
Stereo R 1 14 2
Notes: 1) Connector type on Model 76 is 25-pin D-subminiature
female. Installer must provide plug (male). Connector
uses 4-40 threaded inserts for locking with mating plug.
2) Wiring scheme follows TASCAM DA-88 convention.
Standard DA-88-type wiring harnesses are directly
compatible, with the exception of 4-40 screw threads
being required.
Figure 4. Connections for Analog Monitor
Outputs
Signal Pin Direction
RS-485 Data+ 7 Input
RS-485 Data– 2 Input
Data Shield 1 Shield
Remote Mute All 5 Input
Remote Dim 6 Input
Remote Spare 1 8 Input
Remote Spare 2 9 Input
Remote Input Common 4 Common
Note: Connector type on Model 76 is 9-pin D-subminiature
female. Connector uses 4-40 threaded inserts for
locking with mating plug.
Figure 5. Connector Pin Out for Remote Control
Inputs (RS-485 connections not used)