Studio Technologies 210 2012 - Manual (Page 33)

Model 210 User Guide Issue 5, September 2012
Studio Technologies, Inc. Page 33
P14 (SW INS): Remote switch input: pin 1
common; pin 2 main output control; pin 3
talkback output control.
P13 (DC OUT 1): Auxiliary DC output 1:
pin 1 common; pin 2 +12 Vdc; pin 3
–12 Vdc.
P20 (DC OUT 2): Auxiliary DC output 2:
pin 1 common; pin 2 +12 Vdc; pin 3
–12 Vdc.
P17 (RELAY CONTACT): Form-A
(normally open, not-shorted) solid-state
relay contact: pin 1 common; pins 2 & 3
relay contact (isolated from common).
Pushbutton Backlighting
For special applications, provision has
been made to allow illumination (“back-
lighting”) of the two pushbutton switches.
This may prove useful for applications
where adequate room lighting is not avail-
able. It can also serve in custom Model
210 configurations. Note that this is an
advanced feature, intended only to be
implemented by a qualified technician.
From the outset several limitations must
be discussed. The first is that button
backlighting is not intended to serve tally
applications. (A common connection to
power both lamps is provided; indepen-
dent access to the lamp connections on
each button is not provided.) It is strictly
intended to provide a moderate amount
of illumination to the button’s clear lens
and associated labeling. The second
restriction is that power for the backlight-
ing function cannot be provided by the IFB
input—there is simply not enough cur-
rent available from a typical IFB circuit to
power the Model 210 and light the lamps.
However, power from the external 24 volt
DC source can be used. This requires that
this power source be connected whenever
backlighting is desired.
From the factory, lamps (“bulbs”) are
not installed in the pushbutton housings.
They are pluggable T-1 bi-pin type and
are simple to install. The mating socket
is accessed by removing the button’s
lens caps, graphic label, and back frosted
lens. Compatible incandescent lamps with
a nominal rating of 18 volts, 28 mA are
available from Studio Technologies (part
number 12030). Bulbs with other nominal
voltages should also be available from
electronics parts vendors. While compatible
LED-based lamps are probably also avail-
able, incandescent lamps, when powered
below their rated current and voltage,
can provide extremely long and reliable
operation.
A 3-position header connector, labeled P12,
is located on the Model 210’s main printed
circuit board. It provides access to, and a
means to power, the two lamps. Contact
the factory for details on implementation.
Remote Control Connections
Provision has been made on the Model
210’s printed circuit board assembly to al-
low external switches or contact closures to
control the main output and talkback output
functions. A 3-position header, labeled P14,
provides access to the circuitry associ-
ated with the functions. Pin 1 of the header
is connected to the common point of the
Model 210’s circuitry. Pin 2 of the header
is connected to the circuitry associated with
main output pushbutton. Pin 3 of the head-
er is connected to the circuitry associated
with the talkback output pushbutton.
The input circuitry is “active low,” with a
10 k ohm resistor connected to +5 volts
acting as a pull up. A combination of resis-
tors and capacitors provide ESD protection.
A qualified technician can use these inputs
for special applications. Contact the factory
for additional details.