Studio Technologies 2A 2015 - Manual (Page 21)

Model 2A User Guide Issue 2, March 2015
Studio Technologies, Inc. Page 21
provided by the Model 2A units; an external
power source is not required. A 5-position
screw terminal strip allows connection of
an optional Studio Technologies’ Model
11A Gooseneck Microphone or a line-level
signal.
The Model 24 can be mounted using
either the Model 27A 19-Inch Rack Adapter
or a custom panel cutout. The Model 27A
19-Inch Rack Adapter allows convenient
installation of a Model 24 and a Model 11A
Gooseneck Microphone into one space
of a standard rack enclosure. Refer to the
mechanical drawing in Appendix A for
details. Plenty of room remains on the right
side of the rack adapter panel, allowing
the addition of custom switches, lights, or
connectors as the specific installation may
require.
A custom Model 24 installation is defined
as any installation where you devise the
mounting method! Refer to Appendix A for
a mechanical drawing showing the dimen-
sions of the Model 24. This will assist you
in implementing your own mounting
method.
The Model 24 contains two 9-pin D-submin-
iature connectors (DE-9F). One is designat-
ed to connect to the Model 2A that provides
IFB channels 1 and 2 (unit # 1). The other
connects to the Model 2A designated for
IFB channels 3 and 4 (unit # 2). Contained
on the Model 2A is a 9-pin D-subminiature
female connector (DE-9F) that is used to
connect to the access stations. A “straight
through” cabling scheme links the Model 24
units to the Model 2A units, with pin 1 con-
nected to pin 1, pin 2 to pin 2, etc. Shielded
cable is required as the audio buses linking
a Model 24 to the Model 2As are unbal-
anced. The shield should be connected to
pin 1 on the DE-9M connectors. For refer-
ence, the chart shown in Figure 9 displays
the signals associated with the access
station connector.
Pin # Function
1
Common/Shield
2 Interrupt Audio,
Ch 1 (Model 2A # 1) or Ch 3 (Model 2A # 2)
3 Interrupt Audio,
Ch 2 (Model 2A # 1) or Ch 4 (Model 2A # 2)
4 18 volts DC
(Model 2A # 1 and Model 2A # 2)
5 Interrupt Control,
Ch 1 (Model 2A # 1) or Ch 3 (Model 2A # 2)
6 Interrupt Control,
Ch 2 (Model 2A # 1) or Ch 4 (Model 2A # 2)
7 Lamp Voltage,
Ch 1 (Model 2A # 1) or Ch 3 (Model 2A # 2)
8 Lamp Voltage,
Ch 2 (Model 2A # 1) or Ch 4 (Model 2A # 2)
9 Monitor Output Mute Control
(Model 2A # 1 and Model 2A # 2)
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 9. Model 24 Access Station Connections
For best performance, a maximum total
cable length of 500 feet should be used to
link Model 24s to the Model 2As. Minimiz-
ing the cable length reduces the total expo-
sure the unbalanced audio buses have to
noise pickup, etc. Cable runs longer than
500 feet are possible but should be care-
fully checked for correct operation.
If more than one Model 24 is going to be
installed some method of “multing” or “split-
ting” the 9-pin D-subminiature connectors