Extron Electronics MLA-VC10 User Manual

User’s Manual

MLA-VC10

MediaLink Accessory

68-690-01

Rev. B

03 08

Precautions

Safety Instructions • English

This symbol is intended to alert the user of important
operating and maintenance (servicing) instructions in
the literature provided with the equipment.

This symbol is intended to alert the user of the
presence of uninsulated dangerous voltage within
the product’s enclosure that may present a risk of
electric shock.

Caution

Read Instructions • Read and understand all safety and operating

instructions before using the equipment.

Retain Instructions • The safety instructions should be kept for future

reference.

Follow Warnings • Follow all warnings and instructions marked on the

equipment or in the user information.

Avoid Attachments • Do not use tools or attachments that are not

recommended by the equipment manufacturer because they may be
hazardous.

Consignes de Sécurité • Français

Ce s ymbole sert à avert ir l’ut ilisat eur qu e la
documentation fournie avec le matériel contient des
instructions importantes concernant l’exploitation et
la maintenance (réparation).

Ce symbole sert à avertir l’utilisateur de la présence
dans le boîtier de l’appareil de tensions dangereuses
non isolées posant des risques d’électrocution.

Attention

Lire les instructions• Prendre connaissance de toutes les consignes de

sécurité et d’exploitation avant d’utiliser le matériel.

Conserver les instructions• Ranger les consignes de sécurité afin de pouvoir

les consulter à l’avenir.

Respecter les avertissements • Observer tous les avertissements et consignes

marqués sur le matériel ou présentés dans la documentation utilisateur.

Eviter les pièces de fixation • Ne pas utiliser de pièces de fixation ni d’outils

non recommandés par le fabricant du matériel car cela risquerait de poser
certains dangers.

Sicherheitsanleitungen • Deutsch

Die ses Sy mbol sol l dem Ben utzer in de r im
Lieferumfang enthaltenen Dokumentation besonders
wichtige Hinweise zu r Bedienung und Wartung
(Instandhaltung) geben.

Dieses Symbol soll den Benutzer darauf aufmerksam
mache n, daß im Inneren des Gehä uses die ses
Produktes gefährliche Spannungen, die nicht isoliert
sind und die einen elektrischen Schock verursachen
können, herrschen.

Achtung

Lesen der Anleitungen • Bevor Sie das Gerät zum ersten Mal verwenden,

sollten Sie alle Sicherheits-und Bedienungsanleitungen genau durchlesen
und verstehen.

Aufbewahren der Anleitungen • Die Hinweise zur elektrischen Sicherheit

des Produktes sollten Sie aufbewahren, damit Sie im Bedarfsfall darauf
zurückgreifen können.

Befolgen der Warnhinweise • Befolgen Sie alle Warnhinweise und

Anleitungen auf dem Gerät oder in der Benutzerdokumentation.

Keine Zusatzgeräte • Verwenden Sie keine Werkzeuge oder Zusatzgeräte,

die nicht ausdrücklich vom Hersteller empfohlen wurden, da diese eine
Gefahrenquelle darstellen können.

Instrucciones de seguridad • Español

Este símbolo se utiliza pa ra advertir al usuario
sobre ins trucciones import antes de operació n y
mantenimiento (o cambio de partes) que se desean
desta car en el conteni do de la docum entación
suministrada con los equipos.

Este símbolo se utiliza para advertir al usuario sobre
la presencia de elementos con voltaje peligroso sin
protección aislante, que puedan encontrarse dentro
de la caja o alojamiento del producto, y que puedan
representar riesgo de electrocución.

Precaucion

Leer las instrucciones • Leer y analizar todas las instrucciones de operación y

seguridad, antes de usar el equipo.

Conservar las instrucciones • Conservar las instrucciones de seguridad para

futura consulta.

Obedecer las advertencias • Todas las advertencias e instrucciones marcadas

en el equipo o en la documentación del usuario, deben ser obedecidas.

Evitar el uso de accesorios • No usar herramientas o accesorios que no

sean especificamente recomendados por el fabricante, ya que podrian
implicar riesgos.

Warning

Power sources • This equipment should be operated only from the power source

indicated on the product. This equipment is intended to be used with a main power
system with a grounded (neutral) conductor. The third (grounding) pin is a safety
feature, do not attempt to bypass or disable it.

Power disconnection • To remove power from the equipment safely, remove all power

cords from the rear of the equipment, or the desktop power module (if detachable),
or from the power source receptacle (wall plug).

Power cord protection • Power cords should be routed so that they are not likely to be

stepped on or pinched by items placed upon or against them.

Servicing • Refer all servicing to qualified service personnel. There are no user-

serviceable parts inside. To prevent the risk of shock, do not attempt to service
this equipment yourself because opening or removing covers may expose you to
dangerous voltage or other hazards.

Slots and openings • If the equipment has slots or holes in the enclosure, these are

provided to prevent overheating of sensitive components inside. These openings
must never be blocked by other objects.

Lithium battery • There is a danger of explosion if battery is incorrectly

replaced. Replace it only with the same or equivalent type recommended by
the manufacturer. Dispose of used batteries according to the manufacturer’s
instructions.

Avertissement

Alimentations• Ne faire fonctionner ce matériel qu’avec la source d’alimentation

indiquée sur l’appareil. Ce matériel doit être utilisé avec une alimentation principale
comportant un fil de terre (neutre). Le troisième contact (de mise à la terre) constitue
un dispositif de sécurité : n’essayez pas de la contourner ni de la désactiver.

Déconnexion de l’alimentation• Pour mettre le matériel hors tension sans danger,

déconnectez tous les cordons d’alimentation de l’arrière de l’appareil ou du module
d’alimentation de bureau (s’il est amovible) ou encore de la prise secteur.

Protection du cordon d’alimentation • Acheminer les cordons d’alimentation de

manière à ce que personne ne risque de marcher dessus et à ce qu’ils ne soient pas
écrasés ou pincés par des objets.

Réparation-maintenance • Faire exécuter toutes les interventions de réparation-

maintenance par un technicien qualifié. Aucun des éléments internes ne peut être
réparé par l’utilisateur. Afin d’éviter tout danger d’électrocution, l’utilisateur ne doit
pas essayer de procéder lui-même à ces opérations car l’ouverture ou le retrait des
couvercles risquent de l’exposer à de hautes tensions et autres dangers.

Fentes et orifices • Si le boîtier de l’appareil comporte des fentes ou des orifices, ceux-ci

servent à empêcher les composants internes sensibles de surchauffer. Ces ouvertures
ne doivent jamais être bloquées par des objets.

Lithium Batterie • Il a danger d’explosion s’ll y a remplacment incorrect de la batterie.

Remplacer uniquement avec une batterie du meme type ou d’un ype equivalent
recommande par le constructeur. Mettre au reut les batteries usagees conformement
aux instructions du fabricant.

Vorsicht

Stromquellen • Dieses Gerät sollte nur über die auf dem Produkt angegebene

Stromquelle betrieben werden. Dieses Gerät wurde für eine Verwendung mit einer
Hauptstromleitung mit einem geerdeten (neutralen) Leiter konzipiert. Der dritte
Kontakt ist für einen Erdanschluß, und stellt eine Sicherheitsfunktion dar. Diese
sollte nicht umgangen oder außer Betrieb gesetzt werden.

Stromunterbrechung • Um das Gerät auf sichere Weise vom Netz zu trennen, sollten

Sie alle Netzkabel aus der Rückseite des Gerätes, aus der externen Stomversorgung
(falls dies möglich ist) oder aus der Wandsteckdose ziehen.

Schutz des Netzkabels • Netzkabel sollten stets so verlegt werden, daß sie nicht im

Weg liegen und niemand darauf treten kann oder Objekte darauf- oder unmittelbar
dagegengestellt werden können.

Wartung • Alle Wartungsmaßnahmen sollten nur von qualifiziertem Servicepersonal

durchgeführt werden. Die internen Komponenten des Gerätes sind wartungsfrei.
Zur Vermeidung eines elektrischen Schocks versuchen Sie in keinem Fall, dieses
Gerät selbst öffnen, da beim Entfernen der Abdeckungen die Gefahr eines
elektrischen Schlags und/oder andere Gefahren bestehen.

Schlitze und Öffnungen • Wenn das Gerät Schlitze oder Löcher im Gehäuse aufweist,

dienen diese zur Vermeidung einer Überhitzung der empfindlichen Teile im
Inneren. Diese Öffnungen dürfen niemals von anderen Objekten blockiert werden.

Litium-Batterie • Explosionsgefahr, falls die Batterie nicht richtig ersetzt

wird. Ersetzen Sie verbrauchte Batterien nur durch den gleichen oder einen
vergleichbaren Batterietyp, der auch vom Hersteller empfohlen wird. Entsorgen Sie
verbrauchte Batterien bitte gemäß den Herstelleranweisungen.

Advertencia

Alimentación eléctrica • Este equipo debe conectarse únicamente a la fuente/tipo

de alimentación eléctrica indicada en el mismo. La alimentación eléctrica de este
equipo debe provenir de un sistema de distribución general con conductor neutro
a tierra. La tercera pata (puesta a tierra) es una medida de seguridad, no puentearia
ni eliminaria.

Desconexión de alimentación eléctrica • Para desconectar con seguridad la acometida

de alimentación eléctrica al equipo, desenchufar todos los cables de alimentación
en el panel trasero del equipo, o desenchufar el módulo de alimentación (si fuera
independiente), o desenchufar el cable del receptáculo de la pared.

Protección del cables de alimentación • Los cables de alimentación eléctrica se deben

instalar en lugares donde no sean pisados ni apretados por objetos que se puedan
apoyar sobre ellos.

Reparaciones/mantenimiento • Solicitar siempre los servicios técnicos de personal

calificado. En el interior no hay partes a las que el usuario deba acceder. Para evitar
riesgo de electrocución, no intentar personalmente la reparación/mantenimiento
de este equipo, ya que al abrir o extraer las tapas puede quedar expuesto a voltajes
peligrosos u otros riesgos.

Ranuras y aberturas • Si el equipo posee ranuras o orificios en su caja/alojamiento,

es para evitar el sobrecalientamiento de componentes internos sensibles. Estas
aberturas nunca se deben obstruir con otros objetos.

Batería de litio • Existe riesgo de explosión si esta batería se coloca en la posición

incorrecta. Cambiar esta batería únicamente con el mismo tipo (o su equivalente)
recomendado por el fabricante. Desachar las baterías usadas siguiendo las
instrucciones del fabricante.

安全须知 • 中文

这个符号提示用户该设备用户手册中
有重要的操作和维护说明。

这个符号警告用户该设备机壳内有暴

露的危险电压，有触电危险。

注意

阅读说明书 • 用 户 使 用 该 设 备 前 必 须 阅 读 并 理

解 所 有 安 全 和 使 用 说 明 。

保存说明书 • 用户应保存安全说明书以备将来使

用。

遵守警告 • 用户应遵守产品和用户指南上的所有安

全和操作说明。

避免追加 • 不要使用该产品厂商没有推荐的工具或

追加设备，以避免危险。

警告

电源 • 该 设 备 只 能 使 用 产 品 上 标 明 的 电 源 。 设 备

必 须 使 用 有 地 线 的 供 电 系 统 供 电 。 第 三 条 线
（ 地 线 ） 是 安 全 设 施 ， 不 能 不 用 或 跳 过 。

拔掉电源 • 为安全地从设备拔掉电源，请拔掉所有设备后

或桌面电源的电源线，或任何接到市电系统的电源线。

电源线保护 • 妥善布线， 避免被踩踏，或重物挤压。
维护 • 所有维修必须由认证的维修人员进行。 设备内部

没有用户可以更换的零件。为避免出现触电危险不要自
己试图打开设备盖子维修该设备。

通风孔 • 有些设备机壳上有通风槽或孔，它们是用来防止

机内敏感元件过热。 不要用任何东西挡住通风孔。

锂电池 • 不正确的更换电池会有爆炸的危险。 必须使用

与厂家推荐的相同或相近型号的电池。 按照生产厂的
建议处理废弃电池。

声明

所使用电源为 A 级产品，在生活环境中，该产品可能会造成无线电干扰。在这种情况下，可能需要用
户对其干扰采取切实可行的措施。

FCC Class A Notice

This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this
device may not cause harmful interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation. The Class A limits are designed to
provide reasonable protection against harmful interference when the equipment is operated in
a commercial environment. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is likely to
cause harmful interference, in which case the user will be required to correct the interference at his
own expense.

N

This unit was tested with shielded cables on the peripheral devices. Shielded cables must be used

with the unit to ensure compliance with FCC emissions limits.

Quick Start Guide — MLA-VC10

A B

MLA-VC10's
front panel
MLC/RS-232
Power port

+12 VDC

Ground ( )

MLC/RS-232

POWER

Ground all devices

White or
white-striped
wire

An external
power supply
(12 VDC, 1A max.)

Not used for connecting
to computers or
3rd party controllers.

To Controllers

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 2-7 of
this manual.

Step 2

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 3

Terminate cables and connect the MLA-VC10 to the MLC and/or a
power supply.

Step 4

Connect to an amplifier or mixer. The wiring depends on the model
of amplifier or mixer (see "Wiring" on page 2-8). Ground the chassis

of all units together.

MLA-VC10 • Quick Start Guide

QS-1

Quick Start Guide — MLA-VC10, cont’d

AMP/MIXER

CONTROL

CTRL

Ground ( )

To Amplifier

0 VDC to +10 VDC

*

*

The actual maximum control voltage
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 10 VDC.

6 feet (1.8 m) maximum
between the MLA-VC10

and the amplifier

3

4

1

2

7

8

5

6

MLA_VC10_

dip_switch.eps

ON

CONFIGURATION

Step 5

Connect the power cables to a power source and power on the
MLA-VC10, MLC/power supply, RS-232 host device, and amplifier

or mixer.

Step 6

For most MLC units used with the MLA-VC10, configure the system
with the Global Configurator program (see page 3-2) or RS-232 (see
page 3-14). The MLC 206 is not supported by Global configurator
and the MediaLink control software (included with the MLC) must
be used (see page 3-10).

Step 7

Step 8

Step 9

QS-2

Set the MLA-VC10’s DIP switches to match
the voltage determined in step 1. See “DIP
switches” on page 3-11, and the reference tables
on pages 3-12 and 3-13.

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).

If wiring changes are needed, turn off the power and unplug
the equipment, make any necessary wiring changes (see
"Troubleshooting", page 3-17), and then restore power to the system.

N

When the MLA-VC10 is attached to the control port of some

amplifiers, the amplifier's front panel volume control knob is

MLA-VC10 • Quick Start Guide

disabled.

i

Table of Contents

Chapter One • Introduction .................................................... 1-1

About this Manual ....................................................................1-2

About the MLA-VC10 ............................................................... 1-2

Chapter Two • Installation and Setup .............................2-1

Front and Rear Panel Features .............................................. 2-2

Determining the Control Voltage ......................................... 2-3

Measuring voltage for a Peavey UMA 35T II amplifier ....... 2-4

Measuring voltage for a Biamp Precedence CMA 60 amplifier

2-5

Measuring the voltage for a TOA A-706 amplifier .............. 2-6

Measuring the voltage for a TOA A-903 amplifier .............. 2-7

Wiring ............................................................................................ 2-8

Wiring the MLC/Power connector ........................................ 2-8

Wiring the amplifier/mixer control connector ................... 2-11

Wiring TOA 700 Series amplifiers ....................................... 2-12

Wiring TOA 900 Series amplifiers ....................................... 2-14

Chapter Three • Configuration and Operation ......... 3-1

Configuration .............................................................................. 3-2

Global Configurator ............................................................... 3-2

Adding the MLA-VC10 driver.................................................3-2

Configuring the MLC Button for amplifier mute .................3-5

Configuring a GC2 Monitor for amplifier mute ...................3-6

Uploading the Configuration File to the MLC ....................3-10

MediaLink® Control Software ............................................. 3-10

DIP switches .........................................................................3-11

Table of MLA-VC10 DIP Switch Settings ............................. 3-12

RS-232 control ......................................................................3-14

Host-to-MLA communications .............................................3-14

MLA-initiated messages .......................................................3-14

Error response .......................................................................3-14

Using the command/response table ...................................3-15

Command/response table for SIS commands ................ 3-16

Operation ................................................................................... 3-17

Troubleshooting ....................................................................... 3-17

MLA-VC10 • Table of Contents

i

Table of Contents, cont’d

Appendix A • Reference Information ............................A-1

Specifications ..............................................................................A-2

Included Parts .............................................................................A-3

Cables ............................................................................................A-3

MLA-VC10 Functional Block Diagram .................................A-3

All trademarks mentioned in this manual are the properties of their respective owners.

68-690-01

ii

MLA-VC10 • Table of Contents

Rev. B

03 08

MLA-VC10

Chapter One

1

Introduction

About this Manual

About the MLA-VC10

Introduction

About this Manual

This manual contains information on how to mount, install and
operate the Extron MLA-VC10. Unless otherwise stated, in
this manual all references to MediaLink Accessory or Volume
Control Accessory pertain to the MLA-VC10.

About the MLA-VC10

In conjuction with a MediaLink® Controller (MLC), 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 0 VDC to 10 VDC variable voltage remote
control port for volume control.

When used with an MLC, the MLA-VC10 can share the MLC's
12 VDC power supply. It can also be installed with an external
12 VDC power supply and a third party RS-232 control device.

Refer to the appropriate user's manual for information on how
to wire control connections to the controller, amplifier or mixer.

N

This manual describes how to measure the amplifier's control
voltage and special requirements for wiring the MLA-VC10 to
specific amplifiers.

Figure 1-1 shows a typical application of the MLA-VC10.

The MLA-VC10 provides a control voltage (supply

voltage) of between 0 and 10 VDC. The MLA-VC10 can
contol amplifiers that use a higher control voltage but the
amplifier's maximum volume will not be reached.

1-2

MLA-VC10 • Introduction

MLA

-

VC1

0

P

O

W

E

R

/

S

T

A

T

U

S

A

B

M

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C
/

R

S

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3

2

P

O

W

E

R

Speakers

MLA-VC10

DVD

VCR

1

2

3

4

5

6

ON

7

8

C

O

N

F

I

G

U

R

A

T

I

O

N

A

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P

/

M

I

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E

R

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O

N

T

R

O

L

C

T

R

L

12 VDC

Control
Voltage

RS-232

12 VDC
Power Supply

O

F

F

O

N

OF

F

ON

E

xt

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C

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F

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DISPL

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MLC 104 IP Plus

VO

LUME

1

2

3

4

O

N

OF

F

VC

R

DV

D

PC

MLC 104 IP Plus

MediaLink
Controller

B

A

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V

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IN

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R

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D

U

A

L

M

O

N

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MPA 122

Mini
Power
Amplifier

Figure 1-1 — The Extron MLA-VC10

MLA-VC10 • Introduction

1-3

Introduction, cont’d

1-4

MLA-VC10 • Introduction

MLA-VC10

Chapter Two

2

Installation and Setup

Front and Rear Panel Features

Determining the Control Voltage

Wiring

Installation and Setup

MLA-VC10

POWER/
STATUS

A B

MLC/RS-232

POWER

1 2

CTRL

AMP/MIXER

CONTROL

1

2

345

6

ON

7

8

CONFIGURATION

3 4

Front and Rear Panel Features

Figure 2-1 — MLA-VC10 front panel

Power/Status indicator LED — This LED lights steadily while

a

the MLA-VC10 receives power, and blinks three times when the
MLA-VC10 receives valid RS-232 volume setting commands.

MLC/RS-232 Power connector — This 5-pole, 3.5 mm captive

b

screw connector is for transmitting and receiving RS-232 signals
and for power and ground connections. Connect cables to this
port for:

a MediaLink Controller (MLC) and the MLC's 12 VDC power

•
supply, or

an external 12 VDC power supply and a third party RS-232

•
control device

2-2

Figure 2-2 — MLA-VC10 rear panel

Amp/Mixer Control connector — Connect a cable between the

c

amplifier's or mixer's remote control port and this 2-pole 3.5 mm
captive screw connector to provide a ground and control voltage
for regulating the audio volume.

Configuration DIP switches — Set these eight switches to

d

configure the MLA-VC10 for the control voltage required by the
amplifier or mixer. See "DIP switches" on page 3-11.

MLA-VC10 • Installation and Setup

Determining the Control Voltage

The MLA-VC10 drives the amplifier's or mixer's remote control
port. Different models of amplifier or mixer may require a
different voltage to control the audio volume. You need to know
the specific voltage requirements of your equipment before you
can configure the MLA-VC10 to control it.

Sometimes the equipment's manual lists the required voltage,
but usually you will have to test the voltage yourself, using a
voltmeter. This section describes how to measure the control
voltage for some widely used amplifiers.

Most amplifiers come in one of two basic configurations:

two-terminal (control and ground)

•
three-terminal (reference, control, and ground)

•

N

The next two pages show how to measure control voltages
on "typical" amplifers: the Peavey UMA 35T II (page 2-4) and
Biamp Precedence CMA 60 (page 2-5).

Following that, two special case amplifiers are described: the
TOA 700 series (page 2-6) and 900 series (page 2-7).

The MLA-VC10 works with a wide range of amplifiers.

The models shown in this section are included as
examples only. The MLA-VC10 is not limited to
working with only the amplifiers shown in this manual.

MLA-VC10 • Installation and Setup

2-3

Installation and Setup, cont’d

Measuring voltage for a Peavey UMA 35T II
amplifier

Control Terminals for Peavey amplifiers usually consist of two
screw terminals. In the example shown below, they are labeled
"Remote Vol". Use a voltmeter, set to VDC, to measure the
voltage.

Figure 2-3 — Measuring control voltage for a Peavey
UMA 35T II: Meter probes are oriented correctly.

In figure 2-3, the measured voltage is positive, so the right
terminal is the signal connection and the left terminal is ground
connection. Write down the measured voltage and which
terminal is ground as this will be important when you set the
DIP switches. If the voltage is negative (see figure 2-4), the
meter's probes are touching the wrong terminals.

Meter probes
correctly oriented

2-4

Meter probes
incorrectly oriented

Figure 2-4 — Measuring control voltage for a Peavey
UMA 35T II: Meter probes are oriented incorrectly.

MLA-VC10 • Installation and Setup

Measuring voltage for a
Biamp Precedence CMA 60 amplifier

Several Biamp amplifiers have
three screw terminals labeled
"remote level". In the picture
at right, the control voltage is
indicated by a C on the panel
over the corresponding screw
terminal. The ground terminal is indicated with a and the
reference terminal is indicated by a +10v.

Even if the voltage is indicated, use a voltmeter to measure the
voltage between the control terminal and the ground terminal
as shown in figure 2-5. Write down the measured voltage and
which terminal is ground as this will be important when you set
the DIP switches.

Figure 2-5 — Measuring control voltage for a Biamp
Precedence CMA 60

N

N

For three-terminal amplifiers, always connect the

MLA-VC10 to the control voltage terminal and ground
terminal of the amplifier's control port. Leave the other
terminal (+10v in this example) open (not connected).

The MLA-VC10 provides a control voltage (supply

voltage) of 0 to 10 VDC. The MLA-VC10 can control
amplifers that use a higher control voltage. However, in
this situation, the maximum volume may not be reached.

MLA-VC10 • Installation and Setup

2-5

Installation and Setup, cont’d

Measuring the voltage for a TOA A-706 amplifier

TOA 700 series amplifiers use a 10k ohm potentiometer instead
of the variable DC voltage on the Remote Volume terminals. To
control volume on these amplifiers, it is necessary to connect the
MLA-VC10 to different terminals on the amplifier (see page
2-12). The control voltage for this amplifier is measured
between the "REMOTE VOLUME" Hot (H) terminal and the
"POWER REMOTE" negative (-) terminal (see figure 2-6).

Write down the measured voltage and which terminal is ground
as this will be important when you set the DIP switches.

N

When measuring voltage, if the reading is positive, the

positive probe indicates the signal voltage terminal and
the ground probe indicates the ground terminal. If the
reading is negative, reverse the probes.

2-6

Figure 2-6 — Measuring control voltage for a
TOA A-706 amplifier

N

The TOA 700 series needs different wiring to connect it

to the MLA-VC10 (see pages 2-12 and 2-13).

MLA-VC10 • Installation and Setup

Measuring the voltage for a TOA A-903 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 the ground. Use a
voltmeter set for VDC to measure the voltage.

In figure 2-7, the measured voltage is positive, indicating that
the upper terminal is the signal voltage terminal and the lower
terminal is the ground. Write down the measured voltage and
which terminal is ground as this will be important when you set
the DIP switches.

N

When measuring voltage, if the reading is positive, the

positive probe indicates the signal voltage terminal and
the ground probe indicates the ground terminal. If the
reading is negative, reverse the probes.

Figure 2-7 — Measuring control voltage for a
TOA A-903 amplifier

N

The TOA 900 series needs different wiring to connect it

to the MLA-VC10 (see pages 2-14 and 2-15).

MLA-VC10 • Installation and Setup

2-7

Installation and Setup, cont’d

Male

9 Pin D Connector

Pin Configuration

Male RS-232
Pin Function

2 Transmit (Tx)
3 Receive (Rx)
5

Ground (Gnd)

1 5

6 9

Power Supply

Output Cord

SECTION A–A

Ridges

Smooth

A A

Wiring

Wiring the MLC/Power connector

N

Power and communications cables should be at least

18 AWG.

N

If the cable has a drain wire, it should be ground at

both ends. To avoid introducing noise and static into
audio channels, the chassis of the MediaLink controller
(if used), the power supply, the MLA-VC10, and the
amplifier or mixer should all share a common ground.

N

The 12 VDC, 1 amp power supply kit (PN 70-055-01)

provides power for both the MLA-VC10 and the MLC.
It is not included with the MLA-VC10.

To connect the MLA-VC10 to the power supply and an Extron
MLC device or a third party control device follow these
instructions and figures 2-8 to 2-11.

Check the polarity of the wires from
the power supply and connect them to
the captive screw power input on the
MLA-VC10 front panel. If the power
supply is also providing power for an MLC device, connect the
same captive screw sockets to the power input on the MLC.

Connect the Transmit (Tx) socket (labeled "A") on the front panel
of the MLA-VC10 to the Receive (Rx) socket (also labeled "A")
on the MLC device. Connect the Receive socket (labeled "B") on
the front panel of the MLA-VC10 to the Transmit socket (also
labeled "B") on the MLC device.

If the MLA-VC10 is to be connected to a third-party control
device:

connect the Transmit socket on the front panel of the MLA-

•
VC10 to the Receive socket of the control device

connect the Receive socket of the MLA-VC10 to the Transmit

•
socket of the control device

connect the ground socket of the MLA-VC10 to the ground

•
socket on the control device

The MLA-VC10 can be connected to a computer serial port
using a DB-9 connector that is wired as shown in the figure
below.

2-8

MLA-VC10 • Installation and Setup

A B

MLA-VC10's
front panel
MLC/RS-232
Power port

+12 VDC

Ground ( )

MLC/RS-232

POWER

Ground all devices

White or
white-striped
wire

An external
power supply
(12 VDC, 1A max.)

Not used for connecting
to computers or
3rd party controllers.

To Controllers

To MLA-VC10's front panel

MLC/RS-232 Power port

MLS and
Power ports
for MLC 226 IP
or MLC 104 IP Plus

RS-232 12V

MLS PWR

A B

Rx

Tx

GROUND

GROUND

+12V IN

Ground ( )

Transmit (Tx)

B

Receive (Rx)

A

Transmit (Tx)
Receive (Rx)

B
A

+12 VDC

+12 VDC

Ground ( )

Figure 2-8 — Connecting a power supply and
controllers to MLA-VC10

Figure 2-9 — Connecting an MLC 226 IP or MLC 104 IP
Plus to MLA-VC10

MLA-VC10 • Installation and Setup

2-9

Installation and Setup, cont’d

MLC 206's
MLS/Power
port

Ground ( )

+12 VDC

Transmit (Tx)

B

Receive (Rx)

A

A

B

MLS / Power

Transmit (Tx)
Receive (Rx)

+12 VDC

Ground ( )

B
A

To MLA-VC10's front panel

MLC/RS-232 Power port

Transmit (Tx)

B

Receive (Rx)

A

Computer or

Third Party Controller's

RS-232 Port

Rx Tx Gnd

Transmit (Tx)
Receive (Rx)

B
A

Ground ( ) Ground ( )

To MLA-VC10's front panel

MLC/RS-232 Power port

Figure 2-10 — Connecting an MLC 206 to MLA-VC10

2-10

MLA-VC10 • Installation and Setup

Figure 2-11 — Connecting a third party controller to
MLA-VC10

N

The length of the exposed wires in the stripping process

is critical. The ideal length is 3/16” (5 mm). If the
stripped section of wire is longer than 3/16”, the exposed
wires may touch, causing a short circuit between them.
If the stripped section of wire is shorter than 3/16”, the
wires can be easily pulled out even if tightly fastened by
the captive screws.

C

Do not tin the wires. Tinned wire does not hold its

shape and can become loose over time.

AMP/MIXER

CONTROL

CTRL

Ground ( )

To Amplifier

0 VDC to +10 VDC

*

*

The actual maximum control voltage
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 10 VDC.

6 feet (1.8 m) maximum
between the MLA-VC10

and the amplifier

Wiring the amplifier/mixer control connector

There are special instructions for wiring TOA 700 series (page
2-12) and TOA 900 series amplifiers (page 2-14). Connect all
other amplifiers and mixers to the 3.5 mm, 2-pole captive screw
control port on the rear panel of the MLA-VC10 (see figure 2-12).
Ensure that the ground wire connects to the ground terminal
on the amplifer (as discussed in the section "Determining the
Control Voltage" on pages 2-3 to 2-7). The control wire must
connect to the control terminal on the amplifier.

N

The cable between the MLA-VC10 and the amplifier/

mixer should not be more than 6 feet (1.8 m). Longer
cables can pick up background noise that affects sound
quality.

Figure 2-12 — Wiring the MLA's Amplifier/Mixer
Control connector

N

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. In those cases the volume
can only be controlled by the MLC's volume control or
through Simple Instruction Set (SIS™) commands.

MLA-VC10 • Installation and Setup

2-11

Installation and Setup, cont’d

3

4

1

2

7

8

5

6

ON

DIP Switches

set for 10.0 VDC

ON

3 2

1

8 7 6 5

4

NC

M

1

23M

MUTE ASSIGNMENT

MUTE RECEIVE (INPUT CH)

MUTE SEND

(INPUT CH)

Wiring TOA 700 Series amplifiers

TOA 700 series amplifers use a 10k ohm potentiometer instead

of a variable DC voltage on the Remote Volume terminals. To
control volume on these amplifers, follow these steps and see
figure 2-13:

1. Configure the DIP switch setting on the
MLA-VC10 for 10 V, with all switches in
the "ON" position (see figure at right).

2. Use the "-" terminal on the TOA amplifier's
Power Remote terminals as an alternative ground point.
Connect the Ground ( ) terminal of the MLA-VC10 to the "-"
terminal of the TOA 700 Series Power Remote terminals.

3. Although this allows the volume to be controlled using
voltage, the remote volume range will be 12 V. To compensate
for the higher voltage range, add a resistor between the "CTL"
terminal of the MLA-VC10 and the "H" terminal of the TOA
amplifier.

The following chart (information courtesy of TOA Electronics)

shows corresponding resistor and attenuation values:

Resistor Values Attenuation Values

Maximum Minimum

100k ohm 0 dB -25 dB
82k ohm 0 dB -32 dB
68k ohm -2 dB -38 dB
56k ohm -3 dB -47 dB
47k ohm -4 dB -55 dB

4. This will drop the maximum and minimum volume
attenuation but will not achieve complete silence when
volume is set to 0. Use Global Configurator to program a
relay from the MediaLink Controller to the TOA amplifier's
"Mute Control" terminals (see pages 3-5 to 3-9).

5. Configure the Mute Assignment DIP switch on the TOA
amplifier to choose which channels are muted at contact
closure. The figure at right shows switches 8, 7, 6, 5, 4, M
(module), 3, 2, and 1 in the down (ON position), which will
mute all channels.

6. Use Global Configurator 2 software
to configure the
MLA-VC10 driver (see page 3-2).

2-12

MLA-VC10 • Installation and Setup

MLA-VC10

POWER/
STATUS

A B

Front

Rear

MLC/RS-232

POWER

CTRL

AMP/MIXER

CONTROL

1

2

345

6

ON

7

8

CONFIGURATION

DISPLAY

Extron MLC 226 IP

To
Relay
port

Extron MLA-VC10

To

MLS

port

C H

R

TOA 700 Series Amplifier

MLC 226 IP

1

2

3

4

5

6

VOLUME

CONFIG

IR

ON

OFF

AUDIO
MUTE

VCR

DVD

DOC
CAM

PC

LAPTOP

AUTO

IMAGE

REMOTE

VOLUME

POWER

REMOTE

MUTE
CONTROL

Figure 2-13 — Controlling a TOA 700 Series amplifier
with MLA-VC10

MLA-VC10 • Installation and Setup

2-13

Installation and Setup, cont’d

3

4

1

2

7

8

5

6

ON

DIP Switches

set for 0.24 VDC

Wiring TOA 900 Series amplifiers

At high volumes, when the MLA-VC10 is used to control

TOA 900 series amplifers unwanted "ticking" and low "hum"
may be heard at the speakers of a projector or monitor. This
is caused by a lack of proper ground isolation between the
MLA-VC10 and the TOA amplifier, which creates ground
loops between the products. To remove this unwanted noise,
follow these steps and see figure 2-14:

1. Configure the DIP switch setting on the
MLA-VC10 for a control voltage of 0.24 V
(see the figure at right and page 3-11).

2. Connect a 1k ohm resistor between the
Ground ( ) terminal of the MLA-VC10 and
the lower terminal of the TOA 900 Series Remote Volume
terminals. It is recommended that the resistor is placed
closest to the amplifier

N

3. Connect the "CTL" terminal of the MLA-VC10 Amp/Mixer

4. Ground the chassis of the MLC to the display. Either run

5. Ground the chassis of the MLC to the TOA amplifier. This can

6. Use Global Configurator 2 software to configure the

22 AWG wire is recommended for connecting the resistor

between the MLA-VC10 and the TOA 900 Series
amplifier.

Control port to the upper terminal of the TOA 900 Series
Remote Volume terminals.

a ground wire from the chassis screw of the display to any
ground pin on the MLC or, if using an Extron Serial cable for
projector control with a DB9 connector, attach the shield wire
of the cable to any ground pin on the MLC.

be done by running a wire from the chassis screw of the TOA
amplifier to any ground pin on the MLC.

MLA-VC10 driver appropriately (see pages 3-2 to 3-10).

2-14

MLA-VC10 • Installation and Setup

MLA-VC10

POWER/
STATUS

A B

Front

Rear

MLC/RS-232

POWER

CTRL

AMP/MIXER

CONTROL

1

2

345

6

ON

7

8

CONFIGURATION

DISPLAY

REMT

VOL

Extron MLC 226 IP

Projector

Extron MLA-VC10

To
MLS
port

TOA 900 Series Amplifier

1k Ohm

MUTE

1

MUTE

2

GND

To
Ground
port

To
Ground
port

To

projector

port

MLC 226 IP

1

2

3

4

5

6

VOLUME

CONFIG

IR

ON

OFF

PIC

MUTE

VCR

DVD

DOC
CAM

PC

LAPTOP

AUTO
IMAGE

RS-232

Figure 2-14 — Controlling a TOA 900 Series Amplifier
with MLA-VC10

MLA-VC10 • Installation and Setup

2-15

Installation and Setup, cont’d

2-16

MLA-VC10 • Installation and Setup

MLA-VC10

Chapter Three

3

Configuration and Operation

Configuration

Operation

Troubleshooting

Configuration and Operation

Select “MLS Port” tab.

Select “Disable MLS
support” radio button.

MLS Port is a
separate folder.

Configuration

Global Configurator

For the MLA-VC10 to work correctly with most MediaLink
Controllers (MLCs), it is necessary to add and configure the
MLA-VC10 driver, using Global Configurator. The following
sections show the basic steps for configuring an MLA-VC10
to work with an MLC 226 IP plus. For more advanced
configuration, consult the manuals that came with the MLC.

The MLC 206 is not supported by the Global Configurator
software. For instructions on configuring this MLC with
MediaLink Control software, see "MediaLink Control Software"
on page 3-10.

Adding the MLA-VC10 driver

To add the MLA-VC10 driver to a MLC, using Global
Configurator, follow these instructions:

1. Open the Global Configurator program and, at the prompt,

open a new or existing project, as required.

2. For a new project, add a new controller, IP address and a

name for the controller.

In the pane on the left there are three major subdirectories:

"Control Ports", "MLS Port", and "Control Modules" (see
figure 3-1 below).

3. To enable serial driver support, click on the MLS Port tab.

4. Select the Disable MLS support (Enable serial driver

support) radio button.

3-2

Figure 3-1 — Opening Global Configurator

MLA-VC10 • Configuration and Operation

“Serial Configuration” tab

“Add Driver” button
Select MLA VC10

from list of drivers.
Select Device type
(Controller).

Select Manufacturer
(Extron).

5. Click Yes on the dialog box that asks if you wish to continue

with serial configuration.

In the pane on the left, "MLS port" is no longer a major

subdirectory, but is listed under "Control Ports".

6. Select "MLS port" in the left pane and the Serial

Configuration tab in the right pane (see figure 3-2 below).

7. Select "Controller" from the Device Type menu.

8. Select "Extron" from the Manufacturer menu.

9. From the list of drivers, select "Extron MLA-VC10" and click

on the Add Driver button.

"Extron MLA-VC10" appears in the "Added Driver" list, and

replaces "MLS Port" in the pane on the left.

A list, with checkable boxes, appears in the "Driver

Command and State Configuration" pane. All the boxes
must be checked.

Figure 3-2 — Adding a driver

10. Select the Advanced Configuration tab in the right pane (see

figure 3-3 on the next page).

11. In the "Volume Settings" section, select "Range" from the

"When adjusting the volume, use:" menu, and "100" as
"Maximum volume steps for projector".

MLA-VC10 • Configuration and Operation

3-3

Configuration and Operation, cont’d

“Advanced
Configuration” tab

Volume Settings

Select “Range”.

Select “100”.

“Front Panel” Tab

Volume Up/Down
Buttons

Select “range(0,100,1)

”

Press green arrow
to associate selected
driver with selected
front panel button.

“Button Operations”
section

Figure 3-3 — Configuring the driver

12. Select the Front Panel tab in the right pane and select the

Volume Up button (see figure 3-4).

13. In the "Button Operations" section, ensure the Driver tab is

selected and that all the directories and sub-directories in
that window are open.

14. Highlight the "range(0,100,1)" option.

15. Click on the green arrow next to the "Press" pane, which

associates the "range(0,100,1)" driver with pressing the
Volume "Up" button.

16. Select the Volume Down button and repeat steps 13-15, which

will also associate the "range(0,100,1)" driver with pressing
the Volume Down button.

3-4

Figure 3-4 — Configuring the volume buttons

MLA-VC10 • Configuration and Operation

“Front Panel” Tab

Button Label

Mute Button

Select “Toggle” mode.

Configuring the MLC Button for amplifier mute

There will be some cases when the audio amplifier's control
voltage is greater than the MLA-VC10 can handle. In those
cases, sound will be heard even when the MLC and MLA-VC10
are at their lowest volume settings.

If the audio amplifier has a contact closure mute feature,
complete silence can be obtained by connecting an available
relay on the MLC to the amplifier's mute terminals. When the
relay closes, the audio amplifier mutes the audio output.

The following section describes how the relay can be controlled
manually with a button. Afterwards, the section "Configuring
a GC2 Monitor for Amplifier Mute" shows how the relay can be
controlled automatically using GC2 monitors.

N

1. Select the Front Panel tab and select an available button (see

2. Rename the button "AUDIO MUTE".

3. Change the button mode to "Toggle".

This section describes how to configure relays with the

MLC 226 IP. The MLC 104 IP plus controller needs the
IPA T RLY4 accessory to implement relays. The
MLC 206 uses different software (see page 3-10).

figure 3-5).

Figure 3-5 — Configuring the mute button (steps
1-3)

MLA-VC10 • Configuration and Operation

3-5

Configuration and Operation, cont’d

“Relay” Tab

Toggle 1 or 2

Click green arrow
to add action to the
“Press” pane.

Relay 1

“Light Control” Tab

“Button Light Control”
“No Blink”

4. In the Button Operations section, select the Relay tab and

expand the "Relay 1" directory (see figure 3-6).

5. At the top of the "Press" pane, select Toggle 1.

6. Select Relay 1 "On", and add it to the "Press" pane by clicking

on the green triangle.

Figure 3-6 — Configuring the mute button (steps
4-6)

7. In the Buttons Operation section, select the Light Control tab

and, in the "No Blink" section, select the Red light. Add it to
the "Press" pane by clicking on the green triangle (see figure
3-7).

3-6

Figure 3-7 — Configuring the mute button (step 7)

8. At the top of the "Press" pane select Toggle 2.

9. Select the Relay tab and add Relay 1 "Off" to the "Press" pane.

10. Select the Light Control tab and add "No Blink, Off" to the

"Press" pane.

Configuring a GC2 Monitor for amplifier mute

The amplifier mute can also be controlled automatically with
GC2 monitors. It works well when a low level of sound persists
at the lowest volume setting. To achieve complete silence, the

MLA-VC10 • Configuration and Operation

“Monitor” Tab

“Add Monitor” Button

Type the name of
the monitored
condition in the box.

mute action must be associated with the lowest volume setting
of the MLA VC10.

In order to mute the amplifier when MLA VC10 is set to "0"
and unmute when the volume increases above "0", follow these
instructions:

Figure 3-8 — Adding a monitored condition (step 1)

1. Select the Monitor tab and click on the Add Monitor button

(see figure 3-8). The Monitored Conditions Wizard opens (see
figure 3-9).

2. Type the name of the monitored condition in the "Enter

Monitored Condition Name" text box.

Figure 3-9 — Monitored Conditions Wizard (step 2)

MLA-VC10 • Configuration and Operation

3-7

Configuration and Operation, cont’d

Select status command.

Select device.

Select monitored condition.

Set “Condition Test
Parameters” to “Equals

”

and “0.0”.

Click “Apply Condition”.

3. Click the Next button.

4. Select "Extron MLA-VC10" from the "Device" pane. A new

range of options opens in the "Status Commands" pane (see
figure 3-10).

Figure 3-10 — Monitored Conditions Wizard (step 4)

5. Select "Volume (Discrete): range (0.100,1)" and choose the

options "Equals" and "0.0" (see figure 3-11).

6. Click on Apply Condition.

7. Click Next.

3-8

Figure 3-11 — Monitored Conditions Wizard (steps
5-7)

MLA-VC10 • Configuration and Operation

Select Relay 1.

Select Close

Click Apply Action.

8. Select "Relay 1" in the "Device" pane (see figure 3-12).

9. Select "Close" in the "Action Commands" pane.

10. Click the Apply Action button.

Figure 3-12 — Monitored Conditions Wizard (steps
8-10)

11. Click Done, which will close the Monitored Conditions

Wizard.

This monitor mutes the TOA amplifier when the MLA VC10

volume is turned to 0.

12. Add a new monitor to unmute the TOA amplifier (see steps 2
and 3).

13. Select "Volume
(Discrete): range
(0.100,1)" and choose
the options "Is greater
or equal" and "1.0" (see
the figure at right and steps 5 and 6).

14. Apply the action and close the Wizard (see steps 7-12).

This monitor unmutes the TOA amplifier when the volume

on the MLA VC10 is turned to 1 or more.

When the Wizard is completed, Global Configurator shows
a list of monitored conditions and actions in the "Monitored
Conditions" pane (see figure 3-13 on the next page).

MLA-VC10 • Configuration and Operation

3-9

Configuration and Operation, cont’d

Figure 3-12 — List of Monitored Conditions

Uploading the Configuration File to the MLC

Once the MLC has been configured on your computer, you must
upload the file to the MLC's memory:

1. Click on the Build option in the Global Configurators menu

bar.

2. Select the "Build all configurations.." option.

3. Give the file a name and save it.

4. The file will be uploaded to the MLC automatically.

MediaLink® Control Software

The MLC 206 is not supported by the Global
Configurator software. To control volume
with an MLC 206 and the MLA-VC10, use the
Controller Config portion of the MediaLink
control software (included with the MLC).
Ensure that the MLC's volume control is set
to Switcher instead of "Projector". Refer to
the MediaLink Controller's User's Manual for
details.

3-10

MLA-VC10 • Configuration and Operation

3

4

1

2

7

8

5

6

3

4

1

2

7

8

5

6

ON

CONFIGURATION

0 to 10.0 VDC 0 to 4.98 VDC NOT HALFWAY

UP

DOWN

CONFIGURATION

DIP switches

Using the table on the two following pages, select the voltage
that is closest to the control voltage of the amplifer or mixer (see
"Determining the Control Voltage" on pages 2-3 to 2-7). Note the
configuration of the DIP switches that is needed to achieve that
voltage and set the DIP switches on the rear panel of the MLA­VC10 in that configuration.

N

The switch must be fully up or fully down. An

intermediate setting causes the MLA-VC10 to oscillate
erratically between the two possible values.

MLA-VC10 • Configuration and Operation

3-11

Configuration and Operation, cont’d

Voltage

10.00

9.96

9.92

9.88

9.84

9.80

9.76

9.69

9.73

9.65

Closed = up,

Open = down,

MLA-VC10 DIP Switch Settings for Approximate

Amplifier/Mixer Measured Control Voltages

1 2 3 4 5 6 7

9.61

9.57

9.53

9.49

9.45

9.41

9.37

9.29

9.33

9.25

9.22

9.18

9.10

9.14

9.06

8.82

8.78

8.71

8.75

8.67

8.63

8.59

8.51

8.55

8.47

8.43

8.39

8.31

8.35

8.27

8.24

8.20

8.12

8.16

9.02

8.98

8.90

8.94

8.86

8

1 2 3 4 5 6 7 8

Voltage

8.04

8.00

7.96

7.92

7.88

7.84

7.80

7.73

7.76

7.69

Closed = up,

Open = down,

1 2 3 4 5 6 7

7.65

7.61

7.57

7.53

7.49

7.45

7.41

7.33

7.37

7.29

7.25

7.22

7.14

7.18

7.10

6.86

6.82

6.75

6.78

6.71

6.67

6.63

6.55

6.59

6.51

6.47

6.43

6.35

6.39

6.31

6.27

6.24

6.16

6.20

8.08 6.12

7.06

7.02

6.94

6.98

6.90

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

Voltage

6.08

6.04

6.00

5.96

5.92

5.88

5.84

5.76

5.80

5.73

Closed = up,

Open = down,

1 2 3 4 5 6 7

5.69

5.65

5.61

5.57

5.53

5.49

5.45

5.37

5.41

5.33

5.29

5.25

5.18

5.22

5.14

4.90

4.86

4.78

4.82

4.75

4.71

4.67

4.59

4.63

4.55

4.51

4.47

4.39

4.43

4.35

4.31

4.27

4.20

4.24

4.16

5.10

5.06

4.98

5.02

4.94

8

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

Table of MLA-VC10 DIP Switch Settings

3-12

MLA-VC10 • Configuration and Operation

Voltage

4.12

4.08

4.04

4.00

3.96

3.92

3.88

3.80

3.84

3.76

Closed = up, , on

Open = down,

MLA-VC10 DIP Switch Settings for Approximate

Amplifier/Mixer Measured Control Voltages (cont'd)

1 2 3 4 5 6 7

3.73

3.69

3.65

3.61

3.57

3.53

3.49

3.41

3.45

3.37

3.33

3.29

3.22

3.25

3.18

2.94

2.90

2.82

2.86

2.78

2.75

2.71

2.63

2.67

2.59

2.55

2.51

2.43

2.47

2.39

2.35

2.31

2.24

2.27

3.14

3.10

3.02

3.06

2.98

8

1 2 3 4 5 6 7 8

Voltage

2.16

2.12

2.08

2.04

2.00

1.96

1.92

1.84

1.88

1.80

Closed = up,

Open = down,

1 2 3 4 5 6 7

1.76

1.73

1.69

1.65

1.61

1.57

1.53

1.45

1.49

1.41

1.37

1.33

1.25

1.29

1.22

0.98

0.94

0.86

0.90

0.82

0.78

0.75

0.67

0.71

0.63

0.59

0.55

0.47

0.51

0.43

0.39

0.35

0.27

0.31

2.20

0.24

1.17

1.14

1.06

1.10

1.02

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

Voltage

0.20

0.16

0.12

0.08

0.04

0.00

Closed = up,

Open = down,

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

MLA-VC10 • Configuration and Operation

3-13

Configuration and Operation, cont’d

A B C

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 Simple Instruction Set
(SIS) commands.

The MLA has a 5-pole captive screw connector for
connecting to the MLC and power. The connector
has the following pin assignments:

A = Transmit, B = Receive, C = Not Used,

= Ground, + = +12 VDC input

Host-to-MLA communications

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 MLA executes
that command and sends a response to the host device. All
responses 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.

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.

]

3-14

Error response

When the MLA receives a valid SIS command, it executes the
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:

E13 − Invalid value (the number is out of range/too large)

MLA-VC10 • Configuration and Operation

ASCII to HEX Conversion Table

•

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.

Space

Symbol definitions

]

= CR/LF (carriage return/line feed) (hex 0D 0A)

• = Space

X!

= Volume adjustment range (0 through 100%)

X@

= On/off status

0 = off/disable
1 = on/enable

X#

= Controller firmware version (listed to

two decimal places e.g.: x.xx)

MLA-VC10 • Configuration and Operation

3-15

Configuration and Operation, cont’d

Additional description

Specify the % of maximum audio

volume output.

Set volume to 82% of maximum.

Increment audio volume.

]

X!]

Response

(MLC to host)

V Vol

X!

(host to MLC)

Vol082

82V

X!]

Vol

+V

Decrement audio volume.

Show the % of maximum audio

volume.

Mute all audio outputs.

Unmute all audio outputs.

Show the status of audio mute.

]

]

Amt0

0Z

X@]

Amt

Z

X!]

Vol

-V

X!]

Vol

V

Amt1

1Z

Show the firmware version.

Show MLA's part number

]

X@]

Ver

N60-502-01

Q

N

Command ASCII Command

Volume adjustment

Set the output volume

Example:

Increment volume

Decrement volume

View volume

Audio mute (overall)

Command/response table for SIS commands

3-16

MLA-VC10 • Configuration and Operation

Mute on

Mute off

View the audio mute status

Firmware version, part number & information requests

Query firmware version

Request part number

Operation

To control audio volume when using a MLA-VC10, turn a
connected MediaLink Controller's Volume knob, or send
commmands through an RS-232 remote control device such as a
computer or third party control device.

Troubleshooting

If the MLA-VC10's LED does not light:

The MLA-VC10 is not receiving power. Check the wiring at the
MLA-VC10's MLC/Power port for the correct polarity. Verify
that the power supply has been connected to a functional power
outlet.

If the MLA-VC10's LED does not blink when volume
commands are sent:

The volume command may be out of the acceptable range (0 to
100 steps).

The MLA-VC10 may not be 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:

If you are using a TOA 900 series amplifier, follow the
instructions on page 2-14.

For all other amplifiers/mixers, it may be necessary to move
the amplifier/mixer and MLA-VC10 away from sources of
electromagnetic interference, such as appliances and large
motors.

If the voltage control cable is too long, noise may be picked up
from many sources. Use a cable that is no longer than 6 feet
between the MLA-VC10 and the amplifer or mixer.

The ground line may be noisy. Use a different, "clean"
grounding source. The chassis of the MediaLink controller (if
used), the power supply, the MLA-VC10, and the amplifier or

MLA-VC10 • Configuration and Operation

3-17

Configuration and Operation, cont’d

3

4

1

2

7

8

5

6

3

4

1

2

7

8

5

6

ON

CONFIGURATION

0 to 10.0 VDC 0 to 4.98 VDC NOT HALFWAY

UP

DOWN

CONFIGURATION

mixer should all share a common ground.

If the audio output can still be heard when the MLA-VC10
has a volume setting of 0 VDC

If you are using a TOA 700 series amplifier, follow the
instructions shown on page 2-12.

For all other amplifers, check the gain and level settings on the
amplifier/mixer. Adjust the gain so that you do not hear any
audio output when the MLA-VC10 is set for 0 VDC output
(minimum volume).

To completely mute audio output, use the contact closure
mute relay switches on the MLC 226 IP or the MLC 206. For
relay switches with the MLC 104 IP plus, use the IPA T RLY4
accessory.

If the volume does not change when you change the
volume setting via the MLC or via the RS-232 commands:

The wiring at the amplifier/mixer terminals may be reversed.
Switch the leads for the ground and control voltage.

The DIP switches may be set too high for the output voltage. In
this case the amplifer/mixer will output the maximum audio
level all the time. Retest the amplifier/mixer's control voltage
and reset the DIP switches to match the required voltage.

The amplifier may accept a higher control voltage than the
MLA-VC10 provides, so the amplifier will not reach its highest
volume level.

As a last resort, test the equipment with another amplifier that
has a lower control volume requirement.

If volume changes lead to erratic variation in output
volumes:

Verify that each DIP switch is set either all the way down or all
the way up, not at some intermediate level.

Leaving a DIP switch in the middle can cause unpredictable
changes in volume: the switch intermittently varies between the
on and off setting, yielding control voltages from two different
ranges, only one of which is appropriate for the equipment.

3-18

MLA-VC10 • Configuration and Operation

MLA-VC10

Appendix A

A

Reference Information

Specifications

Included Parts

Cables

MLA-VC10 Functional Block Diagram

Reference Information

Specifications

Control/remote — MLA volume controller

Serial control port .......................... 1 RS-232, 3.5 mm captive screw connector,

5-pole, shared with power input

Baud Rate and protocol ................ 9,600 baud, 8 data bits, 1 stop bit, no parity

Serial control pin configurations . A = TX, B = RS, C = not used, 4 = GND,

+ = +12 VDC input

Program control ............................. Extron's Simple Instruction Set (SIS™)

Control — amplifier

Number/type ................................ 1 control voltage

Connectors ..................................... (1) 3.5 mm captive screw connector, 2 pole

Control voltage output range ...... 0 - 10 VDC

General

Power ............................................. Supplied by a 12 VDC, 1 A external power

supply or a MediaLink™ controller

Power input requirements ........... 12 VDC, 60 mA

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

Cooling ........................................... Convection, unvented

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

(Depth excludes connectors and DIP

switch)

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

N

N

A-2

All nominal levels are at ±10%.

Specifications are subject to change without notice.

MLA-VC10 • Reference Information

MLA-VC10

Control
Voltage

High Z

Amp/Mixer

+V

Microcontroller

Relay

DIP Sw.

Digital

Pot.

Digital

Pot.

Low Z

RS-232/MLC Control

Sets Max Voltage

Tx Rx Gnd+12V

DC Voltage Controller

Power Up Amp

Protection

MLA-VC10 Block Diagram.eps

- Amp/Mixer must support remote volume capabilities.

- Output impedance of MLA-VC10 is lower than the input impedance of the Amp/ Mixer.

- DIP switches set maximum control voltage (10VDC max.).

- Relay shorts to ground when power is removed and for 5 seconds after power up.

Included Parts

These items are included in each order for an MLA-VC10:

Included parts Replacement

MLA-VC10 60-502-01

3.8 mm, 2-pole captive screw connector

3.5 mm, 5-pole captive screw connector 10-319-10
User’s manual

Cables

Plenum Comm-link cable Part number

CTLP/500: 500' (150 m) 22-119-02
CTLP/1000: 1000' (300 m) 22-119-03
CTLP/400: 400' (120 m) 26-461-04

MLA-VC10 Functional Block Diagram

part number

10-319-15

MLA-VC10 • Reference Information

A-3

Reference Information, cont’d

A-4

MLA-VC10 • Reference Information

Extron’s Warranty

Extron Electronics warrants this product against defects in materials and workmanship
for a period of three years from the date of purchase. In the event of malfunction during
the warranty period attributable directly to faulty workmanship and/or materials,
Extron Electronics will, at its option, repair or replace said products or components,
to whatever extent it shall deem necessary to restore said product to proper operating
condition, provided that it is returned within the warranty period, with proof of
purchase and description of malfunction to:

USA, Canada, South America, Europe, Africa, and the Middle East:
and Central America:

Extron Electronics, Europe
Extron Electronics Beeldschermweg 6C
1001 E. Ball Road 3821 AH Amersfoort
Anaheim, CA 92805, USA The Netherlands

Asia: Japan:

Extron Electronics, Asia Extron Electronics, Japan
135 Joo Seng Road, #04-01 Kyodo Building, 16 Ichibancho
PM Industrial Bldg. Chiyoda-ku, Tokyo 102-0082
Singapore 368363 Japan

This Limited Warranty does not apply if the fault has been caused by misuse, improper
handling care, electrical or mechanical abuse, abnormal operating conditions or non­Extron authorized modification to the product.

If it has been determined that the product is defective, please call Extron and ask for an
Applications Engineer at [phone] (USA), 31.33.453.4040 (Europe), 65.6383.4400
(Asia), or 81.3.3511.7655 (Japan) to receive an RA# (Return Authorization number). This
will begin the repair process as quickly as possible.

Units must be returned insured, with shipping charges prepaid. If not insured, you
assume the risk of loss or damage during shipment. Returned units must include the
serial number and a description of the problem, as well as the name of the person to
contact in case there are any questions.

Extron Electronics makes no further warranties either expressed or implied with respect
to the product and its quality, performance, merchantability, or fitness for any particular
use. In no event will Extron Electronics be liable for direct, indirect, or consequential
damages resulting from any defect in this product even if Extron Electronics has been
advised of such damage.

Please note that laws vary from state to state and country to country, and that some
provisions of this warranty may not apply to you.

Extron Electronics, USA

1230 South Lewis Street
Anaheim, CA 92805

800.633.9876 714.491.1500
FAX [phone]

Extron Electronics, Europe

Beeldschermweg 6C
3821 AH Amersfoort, The Netherlands
+800.3987.6673 +31.33.453.4040
FAX [phone]

Extron Electronics, Asia

135 Joo Seng Rd. #04-01
PM Industrial Bldg., Singapore 368363
+800.7339.8766 +65.6383.4400
FAX [phone]

Extron Electronics, Japan

Kyodo Building, 16 Ichibancho
Chiyoda-ku, Tokyo 102-0082
Japan
+81.3.3511.7655 FAX [phone]

www.extron.com

© 2008 Extron Electronics. All rights reserved.