Studio Technologies 780-03 V.4.15 - Manual (Page 14)

Issue 1, April 2015 Model 780-03/790 User Guide
Page 14 Studio Technologies, Inc.
for Surround
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 D-subminiature connector (DE-9F)
is used for the remote control inputs. Refer
to Figure 7 or Appendix A for connection
details. Note that pin 4 (remote common)
connects to the Model 780-03’s internal
circuit common connection as well as to
the Model 780-03’s chassis and mains
earth connections. Figure 7 also shows
two spare remote control inputs (pins 8
and 9). These are provided for future appli-
cations and should remain unconnected.
with 9-pin male D-sub (DE-9M) connectors
on each end is used to interconnect the
Model 780-03 with the Model 790 units. A
cable, approximately 20 feet
(6 meters) in length, is included in the ship-
ping carton. The cable implements all nine
connector pins in a one-to-one manner.
Should an interconnecting cable of a differ-
ent length be required there’s no problem
for one to be fabricated and used. While
it can be wired in a one-to-one fashion
supporting all nine pins, only four connec-
tions are actually required: pin 1 (data +),
pin 6 (data –), pin 4 (DC +), and pin 9 (DC
–). The Model 780-03’s connector pin-out
scheme was designed to allow creation of
an interconnecting cable which uses com-
monly available 2-pair audio cable. This
cable, consisting of two twisted pairs each
with an individual shield, is typically small
in diameter, flexible, and available in many
colors. One pair and shield can be used for
the data connection (pins 1 and 6) while
the other pair and shield can be used for
the DC connections (pins 4 and 9). This
implementation has the advantages of
providing a shield for the data path and a
more robust common (return path) connec-
tion (two conductors including the shield)
for the DC power circuit.
Signal Pin Direction
Data Shield 1 Shield
Remote Mute All 5 Input
Remote Dim 6 Input
Remote Spare 1 8 Input
Remote Spare 2 9 Input
Remote Common 4 Common
Note: Connector type on Model 780-03 is 9-pin female
D-subminiature (DE-9F). Connector uses 4-40
threaded inserts for locking with mating plug.
Figure 7. Connections for Remote Control
Inputs
Signal Pin Direction
Data + (RS-485) 1 To/From Models 790/71
Data – (RS-485) 6 To/From Models 790/71
Data Shield 2 To/From Models 790/71
DC + (12 V) 4 To Models 790/71
DC – (12 V Return) 9 To Models 790/71
DC Power Shield 5 To/From Models 790/71
Note: Connector type on Model 780-03 is 9-pin female
D-subminiature (DE-9F). Connector uses 4-40
threaded inserts for locking with mating plug.
Figure 8. Connections between Model 780-03
and Model 790 and Model 71
Connecting the Model 780-03
to the Model 790
A 9-pin female D-subminiature connector
(DE-9F), labeled To/From Control Con-
soles, is provided on the back panel of the
Model 780-03 Central Controller. This is
used to interface the unit with Model 790
Control Consoles. Refer to Figure 8 or Ap-
pendix A for details. A 9-pin female D-sub
connector (DE-9F) labeled To/From Central
Controller, is provided on the back panel of
each Model 790 Control Console. A cable