instruction manual
AXB-VOL3
Three-Channel Volume Control
AXlink Bus Controllers
AMX Limited Warranty and Disclaimer
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Table of Contents
Table of Contents
Product Information .................................................................................................1
Specifications .................................................................................................................... 1
Installation .................................................................................................................3
DIP Switch Settings........................................................................................................... 3
Wiring ................................................................................................................................ 3
Preparing and connecting captive wires .................................................................................. 3
Wiring guidelines...................................................................................................................... 3
AXlink connector ...................................................................................................................... 4
Volume channels 1 - 3 connectors........................................................................................... 4
Programming ............................................................................................................5
Channel Settings Commands............................................................................................ 5
Levels ................................................................................................................................ 5
Send_Commands.............................................................................................................. 6
AXB-VOL3 Three-Channel Volume Control
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Table of Contents
ii
AXB-VOL3 Three-Channel Volume Control
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.
Product Information
DEVICE
AXlink
12
ON
3
Device
GND
IN
IN
DIP switch
GND
OUT
GND
OUT
GND
OUT
OUT
IN
IN
GND
GND
IN
IN
AXlink LED
AXP
AXM
GND
PWR
OUT
OUT
AXlink VOL CHAN 3 VOL CHAN 2 VOL CHAN 1
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.
Nominal input level: -10 to +4 dBm.
Max. input/output level: +16 dBm.
Volume level resolution: 128 volume level steps (+
Attenuation: 72 dB at full attenuation (mute).
Total Harmonic Distortion: THD = <.008%
Frequency Response 20 Hz to 20 kHz +/- 1 dB
.5 dB per step).
Front
Channel LEDs
Rear
Volume Channel
connector
AXB-VOL3 Three-Channel Volume Control
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Product Information
AXB-VOL3 Specifications (Cont.)
Front Panel Components:
AXlink LED AXlink LED (green and blinks to indicate AXlink communication activity and
Device DIP Switch An 8-position DIP switch used to set the AXlink device number for the
Channel LEDs Red channel LEDs 1 - 3. The LEDs individually light indicating a change in chan-
Rear Panel Components:
AXlink connector 4-pin, captive wire connector, receives power and information via the AXlink and
Volume Channel
connectors
Enclosure Metal with black matte finish
Dimensions (HWD) 1.51" x 5.55" x 5.45" (3.84 cm x 14.10 cm x 13.84 cm)
Weight 1.1 lb (0.499 kg)
AXlink Power 12 VDC @ 230 mA
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.
AXB-VOL3.
nel levels.
AXlink Central Controller.
6-pin, captive wire connectors that control audio level, audio mute, variable ramp
speed and level presets of up to 3 devices.
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AXB-VOL3 Three-Channel Volume Control
Installation
12345678ON
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 1234 5 6 7 8
Value 1 2 4 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.
Installation
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 510.31 feet (155.54 m)
20 AWG 371.29 feet (113.17 m)
22 AWG 201.29 feet (61.35 m)
24 AWG 126.88 feet (38.67 m)
AXB-VOL3 Three-Channel Volume Control
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Installation
AXlink connector
Install the AXlink data/power bus wiring as shown in FIG. 2.
PWR
AXP
AXM
GND
AXB-VOL3
FIG. 2 AXlink data/power connections
PWR
AXP
AXM
GND
Control
system
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-
IN+
GND
OUT-
OUT+
FIG. 3 Volume Channels 1 - 3 Connector wiring diagrams
Unbalanced IN
Jumper IN- to GND
Unbalanced OUT
GND
IN-
IN+
GND
OUT-
OUT+
Balanced
IN
Balanced
OUT
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AXB-VOL3 Three-Channel Volume Control
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 Ramps channels 1 and 2 up. 7 Ramps channel 2 up.
2 Ramps channels 1 and 2 down. 8 Ramps channel 2 down.
3 Mutes channels 1 and 2. 9 Mutes channel 2.
4 Ramps channel 1 up. 10 Ramps channel 3 up.
5 Ramps channel 1 down. 11 Ramps channel 3 down.
6 Mutes channel 1. 12 Mutes channel 3.
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.
Programming
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
AXB-VOL3 Three-Channel Volume Control
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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>]’
Var iables :
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]'
Var iables :
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.
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AXB-VOL3 Three-Channel Volume Control
AXB-VOL3 Send_Commands (Cont.)
PP Syntax:
SEND_COMMAND VOL, ’P<Channel> = P<Channel>’
Var iable:
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.
Programming
AXB-VOL3 Three-Channel Volume Control
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AMX reserves the right to alter specifications without notice at any time.
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