Studio Technologies 2A 2013 - Manual (Page 17)

Model 2A User Guide Issue 1, October 2013
Studio Technologies, Inc. Page 17
Mounting Methods
There are three mounting methods ap-
propriate for the Model 22: the Model 25A
19-Inch Rack Adapter, the Model 28A Panel
Adapter, or a custom implementation. The
Model 25A 19-Inch Rack Adapter allows a
Model 22 and a Model 11A Gooseneck Mi-
crophone to be mounted in a single space
(1U) of a standard 19-inch rack. Refer to
Appendix A for details on how the Model 22
is physically positioned in the Model 25A
19-inch Rack Adapter. Plenty of room re-
mains on the right side of the rack adapter
plate, allowing the addition of custom
switches, lights, or jacks as your installation
may require. (Of course any modifications
will have to be implemented by installation
personnel.)
The Model 28A Panel Adapter allows
the installation of a Model 22 and a Model
11A Gooseneck Microphone in a “cut out”
made in a desk, console, or other enclo-
sure. Refer to Appendix A for a mechanical
drawing of the panel adapter and the re-
quired dimensions of the mounting opening.
A custom Model 22 installation is any appli-
cation where installation personnel devise
an alternative mounting method. Refer to
Appendix A for a mechanical drawing show-
ing detailed dimensions of the Model 22.
Interconnect Wiring
Contained on both the Model 2A and the
Model 22 are 9-pin D-subminiature female
(DE-9F) connectors. A “straight through”
cabling scheme links the units together,
with pin 1 connected to pin 1, pin 2 to pin
2, etc. Shielded cable is required as the
two audio buses linking the Model 22 units
to a Model 2A are unbalanced. The shield
should be connected to pin 1 on the 9-pin
plugs. For reference, the following chart
displays the signals associated with the
access station connector:
Pin # Function
1
Common/Shield
2 Interrupt Audio, Ch 1
3 Interrupt Audio, Ch 2
4 18 volts DC
5 Interrupt Control, Ch 1
6 Interrupt Control, Ch 2
7 Lamp Voltage, Ch 1
8 Lamp Voltage, Ch 2
9 Monitor Output Mute Control
Note:
Connector type on Model 2A is a 9-pin D-subminia-
ture female (DE-9F). Installer must provide a 9-pin
D-subminiature male (DE-9M). Connector uses
4-40 threaded inserts for locking with mating plug.
Figure 7. Model 22 Access Station Connections
For ease of installation, each Model 22
contains two 9-pin D-subminiature female
connectors (DE-9F). The pins on both
connectors are wired in parallel (“multed”).
This allows signals to be easily “looped
through” on their way to the next Model 22.
For short cable runs, standard 9-pin video
monitor extension cables, commonly used
with older-style personal computers, are
an inexpensive way to link a Model 22 with
a Model 2A. Ensure that any cable as-
semblies you purchase use shielded cable,
with the shield connected at pin 1 of both
plugs.
For optimal audio performance a maximum
total cable length of 500 feet can used to
link Model 22 units to the Model 2A. But
minimizing the cable length will reduce the
total exposure that the unbalanced audio
buses will have to noise pickup, etc. Cable