instruction manual

AXB-VOL3

Three-Channel Volume Control

AXlink Bus Controllers

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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

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.

AXlink

DEVICE

AXlink LED

Device DIP switch

Channel LEDs

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: Audio ground: Nominal input level: Max. input/output level: Volume level resolution: Attenuation: Balanced or unbalanced Audio ground opto-isolated from system ground. -10 to +4 dBm. +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
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 Rear Panel Components: AXlink connector Volume Channel connectors Enclosure Dimensions (HWD) Weight AXlink Power 4-pin, captive wire connector, receives power and information via the AXlink and 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. 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) 12 VDC @ 230 mA 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 channel levels.

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 7 8

O 12345678 N

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 Controllers 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)
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 ININ+ GND OUTOUT+

Unbalanced IN Jumper IN- to GND

GND ININ+ GND

Balanced IN

Unbalanced OUT

OUTOUT+

Balanced OUT

FIG. 3 Volume Channels 1 - 3 Connector wiring diagrams

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 Ramps channels 1 and 2 up. Ramps channels 1 and 2 down. Mutes channels 1 and 2. Ramps channel 1 up. Ramps channel 1 down. Mutes channel 1. Channel Description Ramps channel 2 up. Ramps channel 2 down. Mutes channel 2. Ramps channel 3 up. Ramps channel 3 down. 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.
When controlling levels, such as with an active bargraph, there is no LED indication of volume changes.

Levels

1 = Output #= Output #= Output #3

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.

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.
AMX reserves the right to alter specifications without notice at any time.
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