AMX AXB-VOL3 User manual

instruction manual

AXlink Bus Controllers

AXB-VOL3

Three-Channel Volume Control

AMX Limited Warranty and Disclaimer

AMX Corporation warrants its products to be free of defects in material and workmanship under normal use for

three (3) years from the date of purchase from AMX Corporation, with the following exceptions:

• Electroluminescent and LCD Control Panels are warranted for three (3) years, except for the display and touch

overlay components that are warranted for a period of one (1) year.

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warranted for a period of one (1) year.

• Unless otherwise specified, OEM and custom products are warranted for a period of one (1) year.

• Software is warranted for a period of ninety (90) days.

• Batteries and incandescent lamps are not covered under the warranty.

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This includes any lost profits, lost savings, incidental damages, or consequential damages. AMX Corporation is not

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Table of Contents

AXB-VOL3 Three-Channel Volume Control

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

ii AXB-VOL3 Three-Channel Volume Control

Table of Contents

Product Information

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.

Specifications

FIG. 1 AXB-VOL3 front and rear panel

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 (+ .5 dB per step).

Attenuation: 72 dB at full attenuation (mute).

Total Harmonic Distortion: THD = <.008%

Frequency Response 20 Hz to 20 kHz +/- 1 dB

123

DEVICE

AXlink

GND

AXP

AXM

PWR

OUT

GND

OUT

GND

OUT

GND

OUT

GND

AXlink VOL CHAN 3 VOL CHAN 2 VOL CHAN 1

AXlink LED

Device

DIP switch Channel LEDs

Volume Channel

connector

AXlink connector

Front

Rear

Product Information

2AXB-VOL3 Three-Channel Volume Control

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 An 8-position DIP switch used to set the AXlink device number for the

AXB-VOL3.

Channel LEDs 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

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

Installation

AXB-VOL3 Three-Channel Volume Control

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.

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.

Device DIP Switch Settings

Position 1234 5 6 7 8

Value 1 2 4 8 16 32 64 128

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)

Installation

4AXB-VOL3 Three-Channel Volume Control

AXlink connector

Install the AXlink data/power bus wiring as shown in FIG. 2.

Volume channels 1 - 3 connectors

Volume channels 1 - 3 can be wired for unbalanced or balanced line operation, as shown in FIG. 3.

FIG. 2 AXlink data/power connections

FIG. 3 Volume Channels 1 - 3 Connector wiring diagrams

PWR

AXP

AXM

GND

PWR

AXP

AXM

GND

AXB-VOL3

Control

system

GND

IN-

IN+

GND

OUT-

OUT+

Unbalanced IN

Jumper IN- to GND

Unbalanced OUT

GND

IN-

IN+

GND

OUT-

OUT+

Balanced

OUT

Optional 600 ohm resistor can be added for impedance matching, if required

Programming

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..

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 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

6AXB-VOL3 Three-Channel Volume Control

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.

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