AMX nxc Pinouts, Signals, and Functions, NXC-VOL4 Connections/Wiring

NXC-VOL4 Volume Control Card
36 NetLinx Cardframe, Control Cards, and NetModules - Operation Reference Guide
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 in FIG.8 on page 35.
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
Audio Channel Gain Ratio Jumper Settings
Unity jumper not installed
Gain -10 dB Input level/+4 dB Output level setting on pins 1 and 2
Attenuate +4 dB Input level/-10 dB Output level setting on pins 3 and 4