AMX Modero NXD/NXT-1200VG - Manual (Page 33)

Touch Panel Accessories
19 VG-Series Modero Touch Panels
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:
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.
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.
FIG. 5 Wiring the rear AUDIO IN and MIC OUT for use with Unbalanced Audio
• X = Ground
• L = Live (Hot)
• R = Return (Cold)
FIG. 6 Wiring the rear MIC OUT connector for use with Balanced Audio
Unbalanced IN
GND
IN-
IN+
GND
IN-
IN+
Left Channel
Right Channel
(Jumper IN- to GND)
Unbalanced OUT
GND
OUT-
OUT+
Microphone
Unbalanced IN
(Jumper IN- to GND)
AUDIO IN
MIC OUT
Balanced OUT
GND
OUT-
OUT+
Ground signal
Return signal
Line signal