Wiring The Nxa-Avb/Rgb For Unbalanced Audio; Wiring The Nxa-Avb/Rgb For Balanced Audio; Preparing Your Panel For Pass-Thru Control (Using The Nxa-Avb/Rgb Breakout Box) - AMX NXD-1700VG Instruction Manual

Wiring the NXA-AVB/RGB for Unbalanced Audio

Most domestic audio equipment has unbalanced audio inputs and outputs. This means that the audio output (left, right, or mono)
appears on a single wire, and is referenced to "0 V" or "Ground". Typical connectors used are RCA "phono" connectors, DIN plugs/
sockets, and 0.25" (6.3mm) or 3.5mm jack plugs/sockets.
Unbalanced audio is adequate for most domestic environments and for line-level signals in a typical broadcast studio. Problems
may occur if the signals are carried over long distances, especially if the source and destination have separate main supplies. Use
the following wiring drawing (FIG. 5) to configure an unbalanced audio connection.
GND
IN-
IN+
GND
IN-
IN+
AUDIO IN
MIC OUT
GND
OUT-
OUT+
Wiring the rear AUDIO IN and MIC OUT for use with Unbalanced Audio
FIG. 5
When using unbalanced audio for the AUDIO IN connector (FIG. 5), the "-" and the "GND" terminals should be connected together
and then connected to the GND of the unbalance audio signal. When connecting to an unbalanced audio input from the MIC OUT
connector (FIG. 5), wire the "+" terminal to the signal input, and the "GND" terminal to the signal ground.

Wiring the NXA-AVB/RGB for Balanced Audio

Professional audio equipment will often use balanced audio inputs and outputs, usually on 3-pin "XLR" connectors. A balanced
audio signal consists of a pair of wires carrying the audio signal in anti-phase with each other (if one wire carries a positive voltage,
the other carries an equal and opposite negative voltage).
The advantage of balanced audio over unbalanced audio is its ability to reject external interference added as the signal is carried
over the wire. The receiving equipment takes the voltage difference between the two wires as the input signal. Interference will
usually get added to both wires equally, and so gets cancelled by the receiving equipment.
The 3 wires used in a typical XLR lead are often referred to as Ground, Live (Hot) and Return (Cold). "Live" and "Return" carry the
"in-phase" and "out-of-phase" versions of the audio respectively. The pins of the XLR plug/socket are as follows:
• X = Ground
• L = Live (Hot)
• R = Return (Cold)
When connecting the MIC OUT connector to a balanced audio input (FIG. 6), use all three audio terminals (+, -, and GND), then
connect the "+" terminal to the "live" signal, the "-" terminal to the "return" signal, and the "GND" terminal to the ground signal.
GND
OUT-
OUT+
Wiring the rear MIC OUT connector for use with Balanced Audio
FIG. 6

Preparing Your Panel for Pass-thru Control (using the NXA-AVB/RGB Breakout Box)

Pass-thru control allows the NXA-AVB/RGB to act as a control bridge between the USB input signals (coming from a touch panel via
the NXA-RGB card) and a target computer.
The pass-thru is routed from the USB Input device, through the panel, then through internal NXA-RGB card and to the front

RGB RJ-45 connector on the NXA-AVB/RGB. From there the signal is routed through the rear USB port on the breakout box
and finally to the target PC. Refer to FIG. 7 for a visual representation.
NOTE: Pass-thru must be enabled to control devices through the NXA-RGB card when using USB-compatible control devices. Refer to
the following commands to enable pass-thru on the RGB card: ^MPS on page 174 for Mouse pass-thru and ^KPS on page 174 for the
keyboard pass-thru.
The two available USB input connections on the touch panel can be used to provide either Keyboard and/or Mouse signals between
the PC and the panel. You are no longer limited to one mouse and one keyboard. You can use USB hubs and multiple mice/
keyboards in any configuration.
When setting up pass-thru computer control its important to focus on the following areas:
Modero VG Series Touch Panels - Instruction Manual
Unbalanced IN
Left Channel
(Jumper IN- to GND)
Unbalanced IN
Right Channel
(Jumper IN- to GND)
Unbalanced OUT
Microphone
Ground signal
Return signal
Balanced OUT
Line signal
Touch Panel Accessories
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