Studio Technologies 212 2013 - Manual (Page 32)

Issue 5, May 2013 Model 212 User Guide
Page 32 Studio Technologies, Inc.
The 3-position headers on the Model 212’s
main circuit board assembly are generally
located close to their related input or out-
put connectors. The following list provides
the printed circuit board reference numbers
and associated functions:
P1: AES3id Input, pin 1 not used, pin 2
signal, pin 3 shield.
P2: Bidirectional Digital Interface, pin 1
not used, pin 2 signal, pin 3 shield.
P3: External 24 Volt DC Input, pin 1
common, pin 2 +24 volts, pin 3 not
used. Note: header P10 is used by the
back-panel 24 Vdc jack assembly and
is electrically in parallel with P3.
P4: Headphone Output, pin 1 common,
pin 2 left (tip), pin 3 right (ring).
P5: Microphone Input, pin 1 shield, pin 2
high, pin 3 low. Note: follows back-panel
3-pin female XLR pin assignment.
P7: AES3id Output, pin 1 not used, pin 2
signal, pin 3 shield.
Additional functions can be accessed
using these 3-position headers:
P6: Auxiliary Relay Contact B, pin 1
normally closed, pin 2 common, pin 3
normally open.
P8: AES3 Output, pin 1 common, pin 2
high, pin 3 low.
P9: AES3 Input, pin 1 common, pin 2 high,
pin 3 low.
P11: Auxiliary Relay Contact A, pin 1
normally closed, pin 2 common, pin 3
normally open.
P12: Auxiliary Input 2, pin 1 common,
pin 2 unbalanced analog audio, –10 dBu
nominal, pin 3 not used.
P13: Analog Main Output, pin 1 common,
pin 2 unbalanced analog audio @ –2 dBu
nominal, pin 3 not used.
P14: Auxiliary Input 1, pin 1 common,
pin 2 unbalanced analog audio @
–10 dBu nominal, pin 3 not used.
P15: Remote Data Interface, pin 1
common, pin 2 data +, pin 3 data –
P16: DC Output 1, pin 1 common, pin 2
+12 volts, pin 3 –12 volts
P17: Remote Switch Connections, pin 1
common, pin 2 main output control, pin 3
talkback output control
P20: DC Output 2, pin 1 common, pin 2
+12 volts, pin 3 –12 volts
P23: Analog Talkback Output, pin 1
common, pin 2 unbalanced analog audio
@ –2 dBu nominal, pin 3 not used.
Pushbutton Backlighting
For special applications, provision has been
made to allow LED illumination (“backlight-
ing”) of the two pushbutton switches. This
may prove useful for applications where
adequate room lighting is not available. It
can also serve in custom Model 212 con-
figurations. It’s important to note that the
button lighting is not intended to serve tally
applications. It is strictly intended to provide
a moderate amount of illumination of the
button’s clear lens and associated labeling.
From the factory, LED lamps are not in-
stalled in the pushbutton housings. The
socket in each housing was designed for
inserting a pluggable T-1 bi-pin incandes-
cent type but we find that the more modern
leaded T1 LEDs work very well. The Model
212’s 5 volt DC power supply is connected
to the socket in each pushbutton housings
by way of 2.2 k (2200 ohm) resistors. With