User’s Manual
MLA-VC10
MediaLink Accessory
Extron Electronics, USA
1230 South Lewis Street
Anaheim, CA 92805
USA
714.491.1500
Fax 714.491.1517
Extron Electronics, Europe
Beeldschermweg 6C
3821 AH Amersfoort
The Netherlands
+31.33.453.4040
Fax +31.33.453.4050
Extron Electronics, Asia
135 Joo Seng Road, #04-01
PM Industrial Building
Singapore 368363
+65.6383.4400
Fax +65.6383.4664
Extron Electronics, Japan
Daisan DMJ Building 6F
3-9-1 Kudan Minami
Chiyoda-ku, Tokyo 102-0074 Japan
+81.3.3511.7655
68-690-01 Rev. A
Printed in the USA
07 02
Fax +81.3.3511.7656
© 2002 Extron Electronics. All rights reserved.
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Quick Start Guide — MLA-VC10
Setting Up the MLA-VC10
To install and set up the MLA-VC10, follow these steps and see the
appropriate section of this manual for details:
Step 1
Determine the control voltage required
by the amplifier or mixer.
See “Determining the Control Voltage”
on pages 2-3 to 2-6 of this manual.
Step 2
CONFIGURATION
Set the MLA-VC10’s DIP switches to match
the voltage determined in 1. See “Setting the
Configuration DIP Switches” on page 2-7, and
the reference tables on pages 2-8 and 2-9.
ON
1
2
3
4
5
6
7
8
(Example)
CONFIGURATION
CONFIGURATION
UP
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
ON
DOWN
0 to 10.0VDC
0 to 4.98VDC
NOT HALFWAY
Step 3
Turn all of the equipment off. Make sure that the MediaLink
Controller (MLC) (if used), the MLA-VC10, the audio amplifier or
mixer, and RS-232 host device are turned off and disconnected from
the power source.
Step 4
Terminate cables and use them to connect the MLA-VC10 to the
MLC and/or a power supply and to an amplifier or mixer. See
“Cabling” on pages 2-9 to 2-11. Tie all grounds together.
MLA-VC10
Rear Panel
CONFIGURATION
AMP/MIXER
CONTROL
ON
8
1
2
3
4
5
6
7
The actual maximum control voltage
*
CRL
depends on the Configuration DIP switch
settings, but the maximum power output will
not be reached if the amplifier's control port
voltage measures more than 10VDC.
Amplifier
Rear Panel
REMT
VOL
0VDC to +10VDC
*
Ground (
)
MUTE
1
MUTE
2
GND
6 feet (1.8 m) maximum
between the MLA-VC10
and the amplifier
MLA-VC10 • Quick Start Guide QS-1
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Quick Start Guide — MLA-VC10, cont’d
Table of Contents
Chapter 1 • Introduction .......................................................... 1-1
About the MLA-VC10 ........................................................... 1-2
MLA-VC10
MLC/RS-232
POWER
NOTE The external power supply
provides power to both the
An external
power supply
(12VDC,
MLA-VC10 and the MLC.
POWER/
STATUS
A
B
1A max.)
Ground all devices
White or
white-striped
wire
MLA-VC10
Front Panel
Chapter 2 • Installation and Setup ................................... 2-1
Front and Rear Panel Features ....................................... 2-2
+12VDC
NOTE If you use cable
that has a drain
wire, tie the drain
wire to ground at
both ends.
Ground (
)
+12VDC
Ground (
+12VDC
Ground (
Determining the Control Voltage ................................. 2-3
Measuring voltage for a TOA A-903MK2 amplifier ............ 2-4
Measuring voltage for a Peavey UMA™ 35T II amplifier ..... 2-5
)
)
B
A
Receive (Rx)
Transmit (Tx)
Transmit (Tx)
Receive (Rx)
B
A
To connect a
computer or
third party
control system,
see page 2-9.
Measuring voltage for a
Biamp Precedence CMA 60 amplifier ................................... 2-6
A
B
C
IR
D
E
A
B
C
D
E
1A 1B 2A 2B 3A 3B
A
B
C
D
1
2
3
4
5
6
A
B
RS-232
Tally Out
MLS/Power
Display/Source Control
Relays
IR/RCM
Extron Switcher Control
MLC 206
Bottom Panel
Setting the Configuration DIP Switches ................... 2-7
Cabling ........................................................................................ 2-9
Wiring the MLC/Power connector ...................................... 2-10
Wiring the Amp/Mixer Control connector ......................... 2-11
Step 5
Connect the power cables to a power source and power on the
equipment (MLC/power supply, RS-232 host device, and amplifier
or mixer).
Operation................................................................................. 2-12
RS-232 control ...................................................................... 2-12
Command/response table for SIS commands..................... 2-14
Step 6
If you are using an MLC with the MLA-VC10, use the
Controller (MLC) Config portion of the
Troubleshooting ................................................................... 2-15
MediaLink control software (included with the
MLC) to set the MLC’s volume control to
“Switcher” instead of “Projector”. Refer to the
MediaLink Controllers User’s Manual for details.
Appendix A • Specifications, Part Numbers,
and Accessories.............................................................................. A-1
Specifications ......................................................................... A-2
Included Parts......................................................................... A-2
Cables ......................................................................................... A-2
MLA-VC10 Functional Block Diagram ........................ A-3
All trademarks mentioned in this manual are the properties of their respective owners.
Step 7
Test the system by turning the volume knob on the MLC or by
sending a volume-related RS-232 command while listening for a
change in the volume level and observing the MLA-VC10’s LED
(which should blink).
68-690-01 Rev. A
Printed in the USA
07 02
Step 8
If wiring changes are needed, turn off the power and unplug the
equipment, make any necessary wiring changes, then restore power
to the system.
In some applications the amplifier’s front panel volume control
knob may be disabled when the MLA is attached to the
amplifier’s control port.
MLA-VC10 • Quick Start Guide
QS-2
MLA-VC10 • Table of Contents
i
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Table of Contents, cont’d
MLA-VC10
Chapter One
1
Introduction
About the MLA-VC10
MLA-VC10 • Table of Contents
ii
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Introduction
About the MLA-VC10 (part #60-502-01)
MLA-VC10
Along with an RS-232 host device, the Extron MediaLink™
Accessory Volume Control 10 (MLA-VC10) can be used to
remotely control the volume output of an audio mixer or
amplifier that has a 0VDC to 10VDC variable voltage remote
control port for volume control.
The MLA-VC10 can be installed with an Extron MediaLink
Controller (MLC) and the MLC’s 12VDC power supply, or
the MLA-VC10 can be installed with an external 12VDC power
supply and a third party RS-232 control device.
Refer to the appropriate controller’s, amplifier’s, or mixer’s
user’s manual for information on how to wire control
connections.
The MLA-VC10 provides a control voltage (supply
voltage) of between 0VDC and 10VDC. The
MLA-VC10 can control amplifiers that use a higher
control voltage. However, if the MLA-VC10 is used
with devices that use a control port voltage above
10VDC, the maximum volume will not be reached.
Chapter Two
The illustration below shows a typical application.
2
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Installation and Setup
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CONFIGURA
8
7
6
ON
1
5
4
3
2
OL
MLC 206
AMP/MIXER
CONTR
CTRL
Front and Rear Panel Features
Determining the Control Voltage
Setting the Configuration DIP Switches
Cabling
MLC/RS-232
PO
ST
WER/
PO
WER
A
TUS
MLA-VC10
RS-232
12VDC
A
B
Control
Voltage
MLA-VC10
Amplifier
Operation
12VDC
Power Supply
Troubleshooting
Speakers
VCR
DVD
MLA-VC10 • Introduction
1-2
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Installation
Front and Rear Panel Features
Determining the Control Voltage
The MLA-VC10 drives the amplifier’s or mixer’s remote control
port. Each model or line of amplifier or mixer may require a
different voltage for controlling the audio volume. You need to
know the specific voltage your equipment requires before you
can set up the MLA-VC10 to control it.
Front
MLA-VC10
MLC/RS-232
POWER
POWER/
STATUS
Sometimes the equipment’s manual lists the required voltage,
but usually you will have to use a voltmeter to test the voltage
yourself. This section shows examples of how to measure the
control voltage for three widely used amplifiers.
A
B
1
2
Many models of amplifiers have one of two basic
configurations:
• two-terminal (signal and ground)
Power/Status indicator LED — This LED lights steadily while
the MLA-VC10 receives power, and it blinks three times when
the MLA-VC10 receives valid RS-232 volume setting
commands.
1
2
• three-terminal (signal, ground, and control)
The MLA-VC10 will work with a wide range of
amplifiers. Those models shown in this section are
included as examples only. The MLA-VC10 is not
limited to being used with just the amplifier-mixers
shown in this manual.
MLC/RS-232 Power connector — This 5-pole, 3.5 mm captive
screw port is for RS-232 transmit and receive signal connections
and for power and ground connections. Connect cables to this
port for
•
a MediaLink Controller (MLC) and the MLC’s 12VDC
power supply, or
•
an external 12VDC power supply and a third party RS-232
control device.
Rear
CONFIGURATION
AMP/MIXER
CONTROL
ON
1
8
2
3
4
5
6
7
CTRL
3
4
Amp/Mixer Control connector — Connect a cable between the
amplifier’s or mixer‘s remote control port and this 3.5 mm, 2-
pole captive screw connector, which provides a ground and
control voltage for controlling the audio volume.
3
4
Configuration DIP switches — Set these eight switches to
configure the MLA-VC10 for the control voltage required by the
amplifier or mixer. See “Setting the Configuration DIP
Switches“ on page 2-7.
MLA-VC10 • Installation and Operation
2-2
MLA-VC10 • Installation and Operation
2-3
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Installation and Setup, cont’d
Measuring voltage for a TOA A-903MK2 amplifier
Measuring voltage for a Peavey UMA™ 35T II amplifier
Control terminals for several TOA amplifiers are two screw
terminals labeled “REMT VOL”. They do not indicate which
terminal is for control voltage and which is for the ground. Use
a voltmeter (set to VDC) to measure the voltage as shown here.
Control terminals for Peavey amps also usually consist of two
screw terminals, in this example labeled “Remote Vol”. Use a
voltmeter (set to VDC) to measure the voltage as shown below.
If you get
a negative
voltage
In the picture below the measured voltage is positive, so the
upper terminal is the signal voltage terminal, and the lower
terminal is for the ground connection.
reading
on the
meter, the
meter’s
leads are
touching
the wrong
terminals.
When measuring
voltage, if the
reading is positive,
the positive probe
indicates the signal
voltage terminal,
and the ground
probe indicates the
ground connection.
If the voltage is
negative, reverse
the probes.
Measuring control voltage for a Peavey UMA™ 35T
II: meter leads are oriented incorrectly relative to
the amp’s terminals
Write down the measured
voltage for your reference
when you set the DIP
switches, and note which
terminal is for the ground.
In the picture below the measured voltage is positive, so the
right (#1) terminal is the signal terminal, and the left (#2)
terminal is for the ground connection.
Measuring control voltage for a TOA A-903MK2 amp
Measuring control voltage for a Peavey UMA™ 35T
II: meter leads are oriented correctly
Write down the measured voltage for your reference when you
set the DIP switches, and note which terminal is for the ground.
MLA-VC10 • Installation and Setup
2-4
MLA-VC10 • Installation and Setup
2-5
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Installation and Setup, cont’d
Measuring voltage for a
Biamp Precedence CMA 60 amplifier
Setting the Configuration DIP Switches
Set the Configuration DIP switches to the setting corresponding
to the control voltage required by the amplifier or mixer.
See “Determining the Control Voltage” in this chapter. The
table on the following two pages lists all the voltage levels that
Several Biamp amplifiers have three screw terminals labeled
“remote level”. The control voltage may be indicated (by a “C”
in the following picture) on the
panel over the corresponding
screw terminal, and the ground
can be selected. Be sure to set each
CONFIGURATION
switch all the way up or all the way
down, and do not leave it partway
between the two positions.
ON
1
2
3
4
5
6
7
8
terminal is indicated with a
.
Even if the voltage is indicated,
CONFIGURATION
CONFIGURATION
use a voltmeter (set to VDC) to measure the voltage as shown in
the picture below. Write down the measured voltage for your
reference when you set the DIP switches.
UP
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
ON
DOWN
0 to 10.0VDC
0 to 4.98VDC
NOT HALFWAY
Measuring voltage for a Biamp Precedence CMA 60
For three-terminal amps, always connect the MLA-
VC10 to the control voltage terminal and ground
terminal of the amp’s control port. Leave the other
terminal (+10V in this example) open (not connected).
The MLA-VC10 provides a control voltage (supply
voltage) of between 0VDC and 10VDC. The
MLA-VC10 can control amplifiers that use a higher
control voltage. However, if the MLA-VC10 is used
with devices that use a control port voltage above
10VDC, the maximum volume will not be reached.
MLA-VC10 • Installation and Setup
2-6
MLA-VC10 • Installation and Setup
2-7
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Installation and Setup, cont’d
MLA-VC10 DIP Switch Settings for Approximate
Amplifier/Mixer Measured Control Voltages
MLA-VC10 DIP Switch Settings for Approximate
Amplifier/Mixer Measured Control Voltages (cont'd)
Closed = up,
Open = down,
Closed = up,
Open = down,
Closed = up,
Open = down,
Closed = up, , on
Open = down,
Closed = up,
Open = down,
Closed = up,
Open = down,
Voltage
Voltage
Voltage
Voltage
Voltage
Voltage
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
10.00
9.96
9.92
9.88
9.84
9.80
9.76
9.73
9.69
9.65
9.61
9.57
9.53
9.49
9.45
8.04
8.00
7.96
7.92
7.88
7.84
7.80
7.76
7.73
7.69
7.65
7.61
7.57
7.53
7.49
6.08
6.04
6.00
5.96
5.92
5.88
5.84
5.80
5.76
5.73
5.69
5.65
5.61
5.57
5.53
4.12
4.08
4.04
4.00
3.96
3.92
3.88
3.84
3.80
3.76
3.73
3.69
3.65
3.61
3.57
2.55
2.51
2.47
2.43
2.39
2.35
2.31
2.27
2.24
2.20
2.16
2.12
2.08
2.04
2.00
0.98
0.94
0.90
0.86
0.82
0.78
0.75
0.71
0.67
0.63
0.59
0.55
0.51
0.47
0.43
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
9.41
9.37
9.33
9.29
9.25
9.22
9.18
9.14
9.10
9.06
9.02
8.98
8.94
8.90
8.86
8.82
8.78
8.75
8.71
8.67
7.45
7.41
7.37
7.33
7.29
7.25
7.22
7.18
7.14
7.10
7.06
7.02
6.98
6.94
6.90
6.86
6.82
6.78
6.75
6.71
5.49
5.45
5.41
5.37
5.33
5.29
5.25
5.22
5.18
5.14
5.10
5.06
5.02
4.98
4.94
4.90
4.86
4.82
4.78
4.75
3.53
3.49
3.45
3.41
3.37
3.33
3.29
3.25
3.22
3.18
3.14
3.10
3.06
3.02
2.98
2.94
2.90
2.86
2.82
2.78
1.96
1.92
1.88
1.84
1.80
1.76
1.73
1.69
1.65
1.61
1.57
1.53
1.49
1.45
1.41
1.37
1.33
1.29
1.25
1.22
0.39
0.35
0.31
0.27
0.24
0.20
0.16
0.12
0.08
0.04
0.00
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1.17
1.14
1.10
1.06
1.02
8.63
8.59
8.55
8.51
8.47
8.43
8.39
8.35
8.31
8.27
8.24
8.20
8.16
8.12
8.08
6.67
6.63
6.59
6.55
6.51
6.47
6.43
6.39
6.35
6.31
6.27
6.24
6.20
6.16
6.12
4.71
4.67
4.63
4.59
4.55
4.51
4.47
4.43
4.39
4.35
4.31
4.27
4.24
4.20
4.16
2.75
2.71
2.67
2.63
2.59
Cabling
To avoid introducing noise and static into audio
channels, the MediaLink Controller (if used), the power
supply, the MLA-VC10, and the amplifier or mixer
should share the same grounding source.
Power and communications cables should be at least
18 AWG.
MLA-VC10 • Installation and Setup
2-8
MLA-VC10 • Installation and Setup
2-9
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Installation and Setup, cont’d
MLC/RS-232
POWER
A B
Wiring the MLC/Power connector
MLA-VC10
front panel
MLC/RS-232
Power port
The 12VDC, 1 amp power supply kit (part #70-055-01)
is not included with the MLA-VC10.
MLC/RS-232
POWER
A B
White or
white-striped
wire
MLA-VC10
MLC/POWER
POWER/
STATUS
A
B
MLA-VC10's
front panel
MLC/RS-232
Power port
MLA-VC10
+12VDC input
Ground (
Front Panel
)
An external
power supply
(12VDC, 1A max.)
White or
white-striped
wire
Ground all devices
Connecting an MLA-VC10
to an external power supply
+12VDC
Ground (
12VDC
Power Supply
)
An external
power supply
(12VDC, 1A max.)
To avoid introducing noise and static into the audio
channels, the MediaLink Controller (if used), the power
supply, the MLA-VC10, and the amplifier or mixer
should all share the same grounding source.
Ground all devices
A
B
C
IR
D
E
A
B
C
D
E
1A 1B 2A 2B 3A 3B
Relays
A
B
C
D
1
2
3
4
5
6
A
B
RS-232
Tally Out
MLS/Power
Display/Source Control
IR/RCM
Extron Switcher Control
MLC 206 Bottom Panel
+12VDC
Ground (
+12VDC
Ground (
)
)
NOTE The external power
B
A
Receive (Rx)
Transmit (Tx)
Transmit (Tx)
Receive (Rx)
B
A
The 12VDC, 1 amp power supply kit (part #70-055-01)
is not included with the MLA-VC10.
supply provides power
to both the MLA-VC10
and the MLC.
NOTE If you use cable that has a
drain wire, tie the drain wire
to ground at both ends.
MLC 206's
MLS/Power
port
Wiring the Amp/Mixer Control connector
A B
MLS
/
Power
The illustration below shows how to wire the 3.5 mm, 2-pole
captive screw connector for controlling the amplifier or mixer.
NOTE Use the MediaLink control software to set the MLC’s volume control to “Switcher”
instead of “Projector”. Refer to the MediaLink Controllers User’s Manual.
AMP/MIXER
CONTROL
Connecting an MLA-VC10 to an MLC 206
CTRL
MLC/RS-232
POWER
A B
The actual maximum control voltage depends on the
*
MLA-VC10's
Configuration DIP switch settings, but the maximum
power output will not be reached if the amplifier's
control port voltage measures more than 10VDC.
front panel
MLC/RS-232
Power port
MLA-VC10
MLC/POWER
0VDC to +10VDC
White or
white-striped
wire
POWER/
STATUS
*
A
B
Ground (
)
MLA-VC10
Front Panel
+12VDC
Ground (
)
To Amplifier
An external
power supply
(12VDC, 1A max.)
6 feet (1.8 m) maximum
between the MLA-VC10
and the amplifier
Ground all devices
12VDC
Power Supply
Wiring the MLA’s Amp/Mixer Control connector
Ground (
)
Ground (
)
B
A
Receive (Rx)
Transmit (Tx)
Transmit (Tx)
Receive (Rx)
B
A
In some applications the amplifier’s front panel volume
control knob may be disabled when the MLA is attached
to the amplifier’s control port.
Computer or
Third Party
Control's
NOTE If you use cable that has a
drain wire, tie the drain wire
to ground at both ends.
Rx Tx Gnd
Computer or
Third Party Control's
RS-232 Port
RS-232 Port
See the illustration on page 2-9 for power wiring instructions.
The Configuration DIP switches must also be set to select the
outgoing voltage. See pages 2-7 to 2-9.
Connecting an MLA-VC10
to a Computer or Third Party Control's RS-232 Port
MLA-VC10 • Installation and Setup
2-10
MLA-VC10 • Installation and Setup
2-11
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Installation and Setup, cont’d
Operation
Error response
When the MLA receives a valid SIS command, it executes the
To control audio volume when using an MLA-VC10, turn a
command and sends a response to the host device. If the MLA
is unable to execute the command because the command
contains invalid parameters, it returns the following error
response to the host:
connected MediaLink Controller’s Volume knob, or send
commands via an RS-232 remote control device such as a
computer or third party control system.
If you are using an MLC with the
MLA-VC10, use the
E13 – Invalid value (the number is out of range/too large)
Controller (MLC) Config portion of
the MediaLink control software
(included with the MLC) to set the
MLC’s volume control to
“Switcher” instead of “Projector” .
Refer to the MediaLink Controllers
User’s Manual for details.
Using the command/response table
The command/response table lists valid command ASCII codes,
the MLA’s responses to the host, and a description of the
command’s function or the results of executing the command.
Lower case characters are acceptable in the command field
unless otherwise indicated. The following ASCII to HEX
conversion table is for use with the command/response table.
ASCII to HEX Conversion Table
RS-232 control
The RS-232 protocol for the MLA-VC10 is 9600 baud, 1 stop bit,
no parity, and no flow control.
•
The control device (host) can use Extron’s Simple Instruction Set
(SIS) commands.
The MLA’s MLC/Power 5-pole captive screw connector has the
following pin assignments:
A = transmit, B = receive, C = not used,
= ground, + = +12VDC input
Host-to-MLA communications
Symbol definitions
SIS commands consist of one or more characters per field. No
special characters are required to begin or end a command
sequence. When a command is valid, the interface executes the
command and sends a response to the host device. All respon-
ses from the interface to the host end with a carriage return and
a line feed (CR/LF = ), which signals the end of the response
character string. A string is one or more characters.
=
=
=
=
CR/LF (carriage return/line feed) (hex 0D 0A)
Space
•
X1
Volume adjustment range (0 through 100%)
On/off status
0 = off/disable
1 = on/enable
X2
=
Controller firmware version (listed to
two decimal places e.g.: x.xx)
X3
MLA-initiated messages
When the MLA is powered up, it sends the following message
(underlined here) to the host:
(C) Copyright 2002, Extron Electronics, MLA-VC10
No response is required from the host. The MLA may also send
a message of Volxxx where xxx represents the setting for the
percentage of maximum volume.
MLA-VC10 • Installation and Setup
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MLA-VC10 • Installation and Setup
2-13
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Installation and Setup, cont’d
Troubleshooting
If the MLA-VC10’s LED doesn’t light:
• The MLA-VC10 is not receiving power. Check the wiring at
the MLA-VC10’s MLC/Power port for correct polarity.
Verify that the power supply has been connected to a
functional power outlet.
If the MLA-VC10’s LED doesn’t blink when volume
commands are sent:
• The volume command is out of the acceptable range (0 to 100
steps).
• The MLA-VC10 is not receiving RS-232 commands correctly.
If there is no audio output
• Check the wiring at the amplifier/mixer to make sure the
MLA-VC10 is connected to the correct terminals. Verify
that the amplifier/mixer and speakers have been
powered on.
If the output is noisy or has lots of static:
• The amplifier/mixer and MLA-VC10 are installed near
electromagnetic interference sources such as appliances
and large motors. Move the amp/mixer and the
MLA-VC10 away from the interference source.
• The voltage control cable is too long, allowing noise to be
picked up from many sources. Use a shorter cable (6 feet,
max.) between the MLA-VC10 and the amplifier or mixer.
• The ground line may be noisy. Use a different, “clean”
grounding source.
If the volume doesn’t change when you change the
volume setting via the MLC or via RS-232 commands:
• The wiring at the amplifier/mixer terminals is reversed.
Switch the leads for the ground and the control volume.
• The DIP switches are set for too high of an output voltage. If
this is the case, the amplifier/mixer will output the
maximum audio level all the time and will not change.
Retest the amplifier/mixer’s control voltage and reset the
DIP switches to match the required voltage.
MLA-VC10 • Installation and Setup
2-14
MLA-VC10 • Installation and Setup
2-15
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Installation and Setup, cont’d
• The amplifier accepts a higher control voltage than the
MLA-VC10
MLA-VC10 provides, so the amplifier will not reach its
highest volume level. Try another amplifier with a lower
control voltage requirement.
If audio output does not reach the amplifier’s maximum
volume
• If you use an MLA-VC10 with an amplifier/mixer that has a
control voltage requirement above 10VDC, the maximum
volume may not be reached.
If volume changes lead to erratic variation in output
volumes
• Verify that each DIP switch is set either all the way up or all
the way down, not partway between up and down
positions.
CONFIGURATION
CONFIGURATION
Appendix A
UP
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
ON
DOWN
A
0 to 10.0VDC
0 to 4.98VDC
NOT HALFWAY
Leaving a DIP switch in the middle can cause
unpredictable changes in volume: the switch
intermittently varies between on and off settings, yielding
control voltages from two different ranges: one range
that’s appropriate for your equipment, and one that isn’t.
Specifications, Part Numbers,
and Accessories
If the audio output can still be heard when the MLA-VC10
has a volume setting of 0VDC
• Check the gain and level settings on the amplifier or mixer.
Adjust the gain so that you don’t hear any audio output
when the MLA-VC10 is set for 0VDC output (minimum
volume).
Specifications
Included Parts
Cables
MLA-VC10 Functional Block Diagram
MLA-VC10 • Installation and Setup
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Specifications, Part Numbers, and Accessories
Specifications
MLA-VC10 Functional Block Diagram
Control — amplifier
Maximum voltage output .......... 10VDC 5%
General
Power............................................. 12VDC from a 1 A external power supply
Temperature/humidity .............. Storage -40° to +158°F (-40° to +70°C) /
10% to 90%, non-condensing
Operating +32° to +122°F (0° to +50°C) /
10% to 90%, non-condensing
Rack mount................................... No
Enclosure type.............................. Plastic
Enclosure dimensions ................. 1.0" H x 2.4" W x 2.3" D
2.5 cm H x 6.1 cm W x 5.8 cm D
Product weight............................. 0.2 lbs (0.1 kg)
Shipping weight........................... 1 lb (0.5 kg)
Vibration ....................................... ISTA/NSTA 1A in carton
(International Safe Transit Association)
Listings .......................................... UL, CUL
Compliances ................................. CE, FCC Class A, VCCI, AS/NZS, ICES
MTBF ............................................. 30,000 hours
Warranty ....................................... 3 years parts and labor
Specifications are subject to change without notice.
Included Parts
These items are included in each order for an MLA-VC10:
Included parts
Part number
MLA-VC10
60-502-01
10-319-15
10-319-10
68-690-01
3.8 mm, 2-pole captive screw connector
3.5 mm, 5-pole captive screw connector
MLA-VC10 user’s manual
Cables
Plenum Comm-link cable
Part number
50 feet, 100 feet, 200 feet
300 feet, 400 feet
26-461-01, -02, -03
26-461-05, -04
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