AMX TV Converter Box AXB VOL3 User Manual

instruction manual  
AXB-VOL3  
Three-Channel Volume Control  
AXlink Bus Controllers  
 
Table of Contents  
i
AXB-VOL3 Three-Channel Volume Control  
 
Table of Contents  
ii  
AXB-VOL3 Three-Channel Volume Control  
 
Product Information  
Product Information  
The AXB-VOL3 Three-Channel Volume Control provides three audio volume control channels.  
Each line-level channel, opto-isolated from system ground, can be configured for balanced or  
unbalanced line operation. The AXB-VOL3 is programmable for 128 steps of audio level, audio  
mute, variable ramp speed and level presets. The AXB-VOL3 connects to Axcess control systems  
using the 4-wire AXlink data/power bus; it can be used for remote or rack mount applications.  
Front  
DEVICE  
AXlink  
1
2
3
ON  
Device  
DIP switch  
AXlink LED  
Channel LEDs  
Rear  
AXlink  
VOL CHAN 3  
VOL CHAN 2  
VOL CHAN 1  
Volume Channel  
connector  
AXlink connector  
FIG. 1 AXB-VOL3 front and rear panel  
Specifications  
AXB-VOL3 Specifications  
Three line-level audio control channels:  
Line operation:  
Balanced or unbalanced  
Audio ground:  
Audio ground opto-isolated from system ground.  
-10 to +4 dBm.  
Nominal input level:  
Max. input/output level:  
Volume level resolution:  
Attenuation:  
+16 dBm.  
128 volume level steps (+ .5 dB per step).  
72 dB at full attenuation (mute).  
Total Harmonic Distortion: THD = <.008%  
Frequency Response  
20 Hz to 20 kHz +/- 1 dB  
1
AXB-VOL3 Three-Channel Volume Control  
 
   
Product Information  
AXB-VOL3 Specifications (Cont.)  
Front Panel Components:  
AXlink LED  
AXlink LED (green and blinks to indicate AXlink communication activity and  
power:  
• Full-Off indicates no power is being received or the controller is not functioning  
properly.  
• One blink per second indicates power is active and AXlink communication is  
functioning.  
• Full-On indicates there is no AXlink control or activity, but power is On.  
Device DIP Switch  
Channel LEDs  
An 8-position DIP switch used to set the AXlink device number for the  
AXB-VOL3.  
Red channel LEDs 1 - 3. The LEDs individually light indicating a change in chan-  
nel levels.  
Rear Panel Components:  
AXlink connector  
4-pin, captive wire connector, receives power and information via the AXlink and  
AXlink Central Controller.  
Volume Channel  
connectors  
6-pin, captive wire connectors that control audio level, audio mute, variable ramp  
speed and level presets of up to 3 devices.  
Enclosure  
Metal with black matte finish  
1.51" x 5.55" x 5.45" (3.84 cm x 14.10 cm x 13.84 cm)  
1.1 lb (0.499 kg)  
Dimensions (HWD)  
Weight  
AXlink Power  
12 VDC @ 230 mA  
2
AXB-VOL3 Three-Channel Volume Control  
 
Installation  
Installation  
DIP Switch Settings  
Use the device DIP switch to set the AXB-VOL3 AXlink device number. You can set it as one of  
255 devices in an Axcess control system. Set the device number with the total of all ON (down)  
switches. As an example, the DIP switch below defines Device 128.  
Device DIP Switch Settings  
Position  
Value  
1
1
2
2
3
4
4
8
5
6
7
8
16 32 64 128  
The device number takes effect only upon power-up. If you later change the device number, remove  
and reconnect the AXlink connector to enter the new device number into memory. AMX standard  
device numbers are assigned as follows:  
Cards are 1 through 25.  
Boxes are 96 through 127.  
Panels are 128 through 255.  
The AXB-PCCOM emulates a touch panel when set in the panel range.  
Wiring  
Preparing and connecting captive wires  
1. Strip 0.25 inch of wire insulation off all wires.  
2. Insert each wire into the appropriate opening on the connector according to the wiring  
diagrams and connector types described in this section.  
3. Tighten the screws to secure the wires. Do not tighten the screws excessively; doing so may  
strip the threads and damage the connector.  
Wiring guidelines  
The interface requires a 12 VDC power to operate properly. The interface uses a PSN2.8 power  
supply. The Central Controller supplies power via the AXlink cable or external 12 VDC power  
supply. The maximum wiring distance between the Central Controller and interface is determined  
by power consumption, supplied voltage, and the wire gauge used for the cable. The table below  
lists wire sizes and maximum lengths allowable between the VOL3 and Central Controller. The  
maximum wiring lengths for using AXlink power are based on a minimum of 13.5 volts available at  
the Central Controller’s power supply.  
Wiring Guidelines at 230 mA  
Wire Size Maximum Wiring Length  
18 AWG  
20 AWG  
22 AWG  
24 AWG  
510.31 feet (155.54 m)  
371.29 feet (113.17 m)  
201.29 feet (61.35 m)  
126.88 feet (38.67 m)  
3
AXB-VOL3 Three-Channel Volume Control  
 
         
Installation  
AXlink connector  
Install the AXlink data/power bus wiring as shown in FIG. 2.  
PWR  
AXP  
AXM  
GND  
PWR  
AXP  
AXM  
GND  
Control  
system  
AXB-VOL3  
FIG. 2 AXlink data/power connections  
Volume channels 1 - 3 connectors  
Volume channels 1 - 3 can be wired for unbalanced or balanced line operation, as shown in FIG. 3.  
Optional 600 ohm resistor can be added for impedance matching, if required  
GND  
IN-  
GND  
IN-  
Unbalanced IN  
Jumper IN- to GND  
Balanced  
IN  
IN+  
IN+  
GND  
OUT-  
GND  
OUT-  
Balanced  
OUT  
Unbalanced OUT  
OUT+  
OUT+  
FIG. 3 Volume Channels 1 - 3 Connector wiring diagrams  
4
AXB-VOL3 Three-Channel Volume Control  
 
   
Programming  
Programming  
The following sections list Axcess programming commands used with the AXB-VOL3.  
Channel Settings Commands  
Use the AXB-VOL3 channel settings listed for ramp up, ramp down and mute operations..  
AXB-VOL3 Channel Setting Commands  
Channel Description  
Channel Description  
1
2
3
4
5
6
Ramps channels 1 and 2 up.  
7
8
Ramps channel 2 up.  
Ramps channels 1 and 2 down.  
Mutes channels 1 and 2.  
Ramps channel 1 up.  
Ramps channel 2 down.  
Mutes channel 2.  
9
10  
11  
12  
Ramps channel 3 up.  
Ramps channel 3 down.  
Mutes channel 3.  
Ramps channel 1 down.  
Mutes channel 1.  
Ramping a volume channel while the mute channel is on will NOT automatically turn  
off the mute channel (will not restore) but the ramping will still occur and the volume  
change will be noticed when the mute channel is turned off. For setting ramp rates  
and presets, see SEND_COMMAND programming instructions below. For reading  
current volume levels and displaying bargraphs see CREATE_LEVEL and  
SEND_LEVEL programming instructions. Volume channels 1 through 3 use levels 1  
to 3 respectively.  
When controlling levels, such as with an active bargraph, there is no LED indication of volume  
changes.  
Levels  
1 = Output #1  
2 = Output #2  
3 = Output #3  
5
AXB-VOL3 Three-Channel Volume Control  
 
     
Programming  
Send_Commands  
System Send_Commands are stored in the Axcess Control System.  
AXB-VOL3 Send_Commands  
PLT  
Ramps specified channel(s) from current level to a specified preset level or percentage at the  
current rate or optionally in a specified amount of time.  
Syntax:  
SEND_COMMAND VOL, ’P<output channel 0-3>L<level 0-255|0-100%>[T<Time  
0-255 in tenth second increments>]’  
Variables:  
Output Channel = Channel numbers 1, 2 or 3. Output channel 0 = both channels 1 and 2.  
Level = Level number (0-255) or percentage (0-100 percent). Level 0 is lowest volume (same  
as mute) and 255 or 100% is maximum volume.  
Time = Optional ramp time (0-255) in tenths of a second.  
Example 1:  
SEND_COMMAND VOL,'P0L50%'  
Ramps both channels to 50% mid level volume at the current ramp rate.  
Example 2:  
SEND_COMMAND VOL,'P1L255T20'  
Ramps channel 1 to highest level volume in 2 seconds.  
PR  
Sets the ramp rate of the specified channel(s) where the time is the time to ramp the full range  
both down to up and up to down or optionally just down to up or just up to down.  
Syntax:  
SEND_COMMAND VOL, 'P<output channel 0-3>R<ramp rate 0-255 in tenth  
seconds>[U|D]'  
Variables:  
Output Channel = Channel numbers 1, 2 or 3. Output channel 0 = both channels 1 and 2.  
Ramp Rate = Sets ramp rate (1-255) for channel commands in tenth second increments.  
U = Optional character sets rate for ramp up.  
D = Optional character sets rate for ramp down.  
Example 1:  
SEND_COMMAND VOL, 'P0R50'  
Sets ramp rate of channels 1 and 2 to 5 seconds full range from down to up and up to down.  
Example 2:  
SEND_COMMAND VOL, 'P3R50D'  
Sets ramp rate of channel 3 to 5 seconds full range from up to down only.  
6
AXB-VOL3 Three-Channel Volume Control  
 
 
Programming  
AXB-VOL3 Send_Commands (Cont.)  
PP  
Syntax:  
SEND_COMMAND VOL, ’P<Channel> = P<Channel>’  
Variable:  
Channel = Enter channel number.  
Examples:  
SEND_COMMAND VOL, ’P1 = P2’  
Sets channel 1 level to the same as channel 2.  
SEND_COMMAND VOL, ’P1 = P3’  
Sets channel 1 level to the same as channel 3.  
SEND_COMMAND VOL, ’P2 = P1’  
Sets channel 2 level to the same as channel 1.  
SEND_COMMAND VOL, ’P2 = P3’  
Sets channel 2 level to the same as channel 3.  
SEND_COMMAND VOL, ’P3 = P1’  
Sets channel 3 level to the same as channel 1.  
SEND_COMMAND VOL, ’P3 = P2’  
Sets channel 3 level to the same as channel 2.  
Note: You cannot use 'P0' with these commands.  
7
AXB-VOL3 Three-Channel Volume Control  
 
AMX reserves the right to alter specifications without notice at any time.  
brussels • dallas • los angeles • mexico city • philadelphia • shanghai • singapore • tampa • toronto* • york  
3000 research drive, richardson, TX 75082 USA • 469.624.8000 • 800.222.0193 • fax 469.624.7153 • technical support 800.932.6993  
 

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