Revision C • 10/07
HARRIS CORPORATION
2-18
2 Installation
Mic Connections
Microphones must be preamplified to line level
before being connected to an RMX
digital
audio
input. Typically, mics are routed through a mic
processor to preamplify, equalize, and compress
or limit the audio. The mic processor output then
connects to an analog or digital input.
If there is a mic control panel associated with
the mic, then it is wired to an Assignable Logic
connector and that logic connector is “bound” or
associated with the mic audio input connector in
VMCC. This means that regardless of which chan-
nel strip the mic is assigned to, the logic signals
are routed with the audio.
When the console is part of a VistaMax system,
then the mic audio and panel logic could be as-
signed to, or come from, a completely different
console or VistaMax frame. This allows easy shar-
ing of a common voicing studio between two or
more consoles, with only one physical connection
of the mic processor and mic control panel.
For additional networked audio information, see
the VistaMax manual (75-52). For information on
software setup of the console features see Chapter
4, which covers using the VMCC program.
Mic Logic To/From a RMXdigital
Two mic control panels are available for the
RMX
digital
: PRE99-1197 (On, Off, Cough) and
PRE99-1198 (On, Off, Cough and Talkback). Ei-
ther one connects to the Assignable Logic I/O con-
nector that is bound to the mic audio input. A
wiring diagram of the interconnect wiring (90-
1875) is shown on page 2-17.
The remote control switches (On, Off, Cough,
Talkback) connect to the four remote inputs on
pins 2, 3, 8 and 9. Pin 4 is jumpered to pin 10 to
enable the external inputs.
The switch LEDs connect to pins 5, 7 and 11
with pin 1 supplying a ground connection. The
On Tally output (pin 11) drives the LEDs in the
On button and the Off Tally (pin 5) drives the LEDs
in the Off button. The other LEDs (Cough and
Talkback) connect to +5 Volts. Switches and LEDs
are commoned to Logic Ground (pin 1).
To make a custom mic panel, use SPST (single
pole, single throw) momentary contact switches
with LED or lamp indicators. Lamps must be 6.3
volt type with a current draw of under 50 mA. Tie
one side of each switch and lamp to Logic Com-
mon (pin 1). The other side of the Cough and Talk-
back lamps are tied together to +5 volts.
Each switch is tied to its logic counterpart (the
On switch goes to the On (-) input, pin 9, the Off
switch goes to Off (-) input, pin 3, etc. The on/off
lamps are tied to their Tally outputs (On lamp to
On Tally, pin 11; Off lamp to Off Tally, pin 5).
Tally Common (pin 6) is jumpered to +5 Volts
(pin 12). Pin 4, Enable Logic Inputs (+), is also
jumpered to +5 Volts on pin 10.
Assignable Logic I/O and Peripherals
Peripheral devices are controlled through Start
and Stop Commands. These commands can be set
to output a single 220 msec pulse, multiple pulses
(additional pulses with each button press), or they
can be set for sustained logic.
In the basic logic connection example on page
2-26, active low logic is used, thus Tally & Pulse
Common is connected to the logic ground on the
peripheral device (labeled Command Common on
the Denon CD player in the example).
In the complex logic example shown on page
2-27, active high logic is used, thus Tally & Pulse
Common connects to +5 VDC.
Note: This voltage is more typically supplied
directly by the peripheral device in order to
prevent ground loops, but in this example the pe-
ripheral has isolated connections as well.
Peripheral devices control the channel strip
through the Ready logic input. The Ready logic
performs both an audio reset, which turns off the
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