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Installation Guide
NXC-VOL4 Volume Card, 4 Channels
NetLinx Control Cards and NetModules
NetLinx Control Cards can be installed in either the NXF CardFrame, NI-4000, or
NetModules. This document provides basic specifications and wiring information
for the NetLinx Control cards. For detailed information on the cards, refer to the
NetLinx CardFrame, Control Cards, and NetModules Instruction Manual found
on-line at www.amx.com.
NXC-VOL4 Volume Control Card
The NXC-VOL4 Volume Control Card provides four discrete volume control
channels with LED feedback. The volume control channels can be programmed
for mono or stereo operation, and balanced or unbalanced audio connections.
It supports programmable audio levels, audio mute, variable ramp speeds and
preset levels. Use the on-board jumpers to set the gain/attenuation (Unity, Pro
level (+4dBu) to Consumer level (-10dBu) conversion, or Consumer level to Pro
level on each channel).
Specifications:
Pinouts, Signals, and Functions:
NXC-VOL4 Connections/Wiring:
The NXC-VOL4 card contains four audio volume control channels. Each line-
level channel is isolated from system ground and can be configured for balanced
or unbalanced line operation. It supports programmable audio levels, audio
mute, variable ramp speeds, and preset levels. Each audio channel's input to
output gain ratio is adjustable via the on-board jumpers shown below.
FIG. 1 NXC-VOL4 Volume Control card
NXC-VOL4 Specifications
Power Requirements 197 mA @ 12 VDC
Volume 1-4 Four volume channels
Status 1-4
(3 LEDs per channel)
Yellow LED shows level-up/down activity.
Red LED shows mute mode:
• LED 1: Channel 1 RAISE (yellow)
• LED 2: Channel 1 LOWER (yellow)
• LED 3: Channel 1 MUTE (red)
• LED 4: Channel 2 RAISE (yellow)
• LED 5: Channel 2 LOWER (yellow)
• LED 6: Channel 2 MUTE (red)
• LED 7: Channel 3 RAISE (yellow)
• LED 8: Channel 3 LOWER (yellow)
• LED 9: Channel 3 MUTE (red)
• LED 10: Channel 4 RAISE (yellow)
• LED 11: Channel 4 LOWER (yellow)
• LED 12: Channel 4 MUTE (red)
Gain jumpers 1-4 • Unity
Maximum Input Level: +10dBm
• Pro level to Consumer level conversion
(attenuation of +4dBu IN to -10dBu OUT)
Maximum Input Level: +10dBm
• Consumer level to Pro level conversion
(gain of -10dBu IN to +4dBu OUT)
Maximum Input Level: +6dBm
Connections/wiring Two 10-pin 3.5 mm captive-screw terminals
Audio Specifications • Frequency response of 15 Hz - 25 KHz
• THD less than.005% at nominal output level
• S/N ratio greater than 100 dB (IHF A)
• Crosstalk less than 80 dB
• Logarithmic attenuation range of 95 dB
Models • NXC-VOL4 Volume Card
• NXM-VOL4 Volume NetModule
I/O Jumpers (CH1-CH4)
NXC-VOL4 Pinouts, Signals, and Functions
Pin Signal Balanced Function Unbalanced Function
Channel 1
1 GND Audio GND Audio GND
2 Input 1+ Audio IN Audio IN
3 Input 1- Audio IN Audio GND
4 Output 1+ Audio OUT Audio OUT
5 Output 1- Audio OUT no connection
Channel 2
6 GND Audio GND Audio GND
7 Input 2+ Audio IN Audio IN
8 Input 2- Audio IN Audio GND
9 Output 2+ Audio OUT Audio OUT
10 Output 2- Audio OUT no connection
Channel 3
11 GND Audio GND Audio GND
12 Input 3+ Audio IN Audio IN
13 Input 3- Audio IN Audio GND
14 Output 3+ Audio OUT Audio OUT
15 Output 3- Audio OUT no connection
Channel 4
16 GND Audio GND Audio GND
17 Input 4+ Audio IN Audio IN
18 Input 4- Audio IN Audio GND
19 Output 4+ Audio OUT Audio OUT
20 Output 4- Audio OUT no connection
FIG. 2
NXC-VOL4 Volume Control card
Unity (jumper not installed)
Gain (-10 dB Input level/+4 dB Output level setting
Attenuate (+4 dB Input level/-10 dB Output level setting
on pins 1 and 2)
on pins 2 and 3)
(jumper)
(jumper)
(jumper)
(jumper)