Extron electronic MLA-VC10 User Manual

User’s Manual
www.extron.com
Extron Electronics, USA
1230 South Lewis Street Anaheim, CA 92805 USA
714.491.1500 Fax 714.491.1517
Extron Electronics, Europe
© 2002 Extron Electronics. All rights reserved.
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 Fax +81.3.3511.7656
MLA-VC10
MediaLink Accessory
68-690-01 Rev. A
Printed in the USA
07 02
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 symbole sert à avertir l’utilisateur que 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
Dieses Symbol soll dem Benutzer in der im Lieferumfang enthaltenen Dokumentation besonders wichtige Hinweise zur Bedienung und Wartung (Instandhaltung) geben.
Dieses Symbol soll den Benutzer darauf aufmerksam machen, daß im Inneren des Gehäuses dieses 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 para advertir al usuario sobre instrucciones importantes de operación y mantenimiento (o cambio de partes) que se desean destacar en el contenido de la documentación 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.
FCC Class A Notice
Note: 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. These 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.
Note: This unit was tested with shielded cables on the peripheral devices. Shielded cables must be used with the unit to ensure compliance.
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 Beeldschermweg 6C 1230 South Lewis Street 3821 AH Amersfoort Anaheim, CA 92805, USA The Netherlands
Asia: Japan:
Extron Electronics, Asia Daisan DMJ Bldg. 6F, 135 Joo Seng Road, #04-01 3-9-1 Kudan Minami PM Industrial Bldg. Chiyoda-ku, Tokyo 102-0074 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 non-Extron 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 (714) 491-1500 (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, Europe
Extron Electronics, Japan
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
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
CONFIGURATION
(Example)
5
6
2
7
3
8
4
CONFIGURATION
1
2
3
ON
5
4
UP
6
7
8
CONFIGURATION
1
5
2
6
3
7
4
8
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.
8
7
*
MLA-VC10 Rear Panel
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 10VDC.
6 feet (1.8 m) maximum between the MLA-VC10
and the amplifier
REMT
VOL
MUTE
1
MUTE
2
GND
Amplifier Rear Panel
AMP/MIXER
CONTROL
CTRL
CONFIGURATION
ON
1
2
345
0VDC to +10VDC
Ground ( )
6
MLA-VC10 • Quick Start Guide
QS-1
Quick Start Guide — MLA-VC10, cont’d

Table of Contents

MLA-VC10
POWER/ STATUS
MLA-VC10 Front Panel
MLC/RS-232
POWER
A B
ABCDE ABC
IR
RS-232
Display/Source Control
Ground ( )
B A
DE ABC ABD
White or
white-striped
+12VDC
Ground ( )
+12VDC
Receive (Rx) Transmit (Tx)
1A 1B 2A 2B 3A 3B
Relays IR/ RCM
NOTE
The external power supply provides power to both the MLA-VC10 and the MLC.
wire
+12VDC
Ground ( )
Transmit (Tx) Receive (Rx)
Ground all devices
B A
123456
Tally Out
MLS
Extron Switcher Control
/Power
33-644-01 A
07 01
Printed in the
USA
MLC 206 Bottom Panel
NOTE
If you use cable that has a drain wire, tie the drain wire to ground at both ends.
To connect a computer or third party control system, see page 2-9.
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).
Step 6
If you are using an MLC with the MLA-VC10, use the
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.
An external power supply (12VDC, 1A max.)
Chapter 1 • Introduction .......................................................... 1-1
About the MLA-VC10 ........................................................... 1-2
Chapter 2 • Installation and Setup ................................... 2-1
Front and Rear Panel Features ....................................... 2-2
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
Measuring voltage for a
Biamp Precedence CMA 60 amplifier ................................... 2-6
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
Operation ................................................................................. 2-12
RS-232 control ...................................................................... 2-12
Command/response table for SIS commands..................... 2-14
Troubleshooting ................................................................... 2-15
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.
QS-2 i
MLA-VC10 • Quick Start Guide
MLA-VC10 • Table of Contents
Table of Contents, cont’d
MLA-VC10
Chapter One
1
Introduction
About the MLA-VC10
ii
MLA-VC10 • Table of Contents
Introduction

About the MLA-VC10 (part #60-502-01)

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.
The illustration below shows a typical application.
AUX VIDEO
DVD
AMX PC
VCR
Laptop
Laptop
LAY
SP
DI
WER
Extron
MLC 206
12VDC
PO
E
LUM
VO
MAX/
MIN
6
20
C L M
PC
MediaLink Controller
CONFIGURATION
ON
3
2
1
AMP/MIXER
CONTROL
CTRL
MLA-VC10
RS-232
POWER/ STATUS
MLC/RS-232
POWER
A B
MLA-VC10
7
6
5
4
Control Voltage
MLA-VC10
Chapter Two
2
Installation and Setup
8
Front and Rear Panel Features
Determining the Control Voltage
Setting the Configuration DIP Switches
1-2
12VDC Power Supply
MLA-VC10 • Introduction
VCR
DVD
Amplifier
Speakers
Cabling
Operation
Troubleshooting
Installation
R
Front and Rear Panel Features
Front
MLC/RS-232
POWER
POWER/ STATUS
Power/Status indicator LED — This LED lights steadily while
1
A B
the MLA-VC10 receives power, and it 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
2
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.
MLA-VC10
21

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.
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.
Many models of amplifiers have one of two basic configurations:
• two-terminal (signal and ground)
• 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.
ear
AMP/MIXER
CONTROL
CTRL
Amp/Mixer Control connector — Connect a cable between the
3
amplifier’s or mixer‘s remote control port and this 3.5 mm, 2­pole captive screw connector, which provides a ground and control voltage for controlling the audio volume.
Configuration DIP switches — Set these eight switches to
4
configure the MLA-VC10 for the control voltage required by the amplifier or mixer. See “Setting the Configuration DIP Switches“ on page 2-7.
2-2
MLA-VC10 • Installation and Operation
CONFIGURATION
ON
1
2
345
43
8
7
6
MLA-VC10 • Installation and Operation
2-3
Installation and Setup, cont’d
Measuring voltage for a TOA A-903MK2 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.
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.
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.
Write down the measured voltage for your reference when you set the DIP switches, and note which terminal is for the ground.
Measuring voltage for a Peavey UMA™ 35T II amplifier
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 reading on the meter, the meter’s leads are touching the wrong terminals.
Measuring control voltage for a Peavey UMA™ 35T II: meter leads are oriented incorrectly relative to the amp’s terminals
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.
2-4
Measuring control voltage for a TOA A-903MK2 amp
MLA-VC10 • Installation and Setup
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
2-5
Installation and Setup, cont’d
Measuring voltage for a Biamp Precedence CMA 60 amplifier
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 terminal is indicated with a .
Even if the voltage is indicated, 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.

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 can be selected. Be sure to set each switch all the way up or all the way down, and do not leave it partway between the two positions.
CONFIGURATION
1
5
2
3
ON
4
UP
6
7
8
0 to 10.0VDC 0 to 4.98VDC NOT HALFWAY
CONFIGURATION
1
2
3
4
ON
1
5
6
7
8
DOWN
CONFIGURATION
5
6
2
7
3
8
4
Measuring voltage for a Biamp Precedence CMA 60
For three-terminal amps, always connect the MLA­VC10 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
MLA-VC10 • Installation and Setup
2-72-6
Installation and Setup, cont’d
MLA-VC10 DIP Switch Settings for Approximate
Amplifier/Mixer Measured Control Voltages
Voltage
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
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
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 6.12
2-8
Closed = up,
Open = down,
1234567
12345678 12345678
12345678
MLA-VC10 • Installation and Setup
Voltage
8
Closed = up,
Open = down,
1234567
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
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
12345678
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
Voltage
8
Closed = up,
Open = down,
1234567
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
12345678
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
12345678
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
MLA-VC10 DIP Switch Settings for Approximate
Amplifier/Mixer Measured Control Voltages (cont'd)
Voltage
8
Closed = up, , on
1234567
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
Open = down,
Voltage
8
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
12345678 12345678
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
12345678
2.75
2.71
2.67
2.63
2.59
1.17
1.14
1.10
1.06
1.02
Closed = up,
Open = down,
1234567
8
12345678
Voltage
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
0.39
0.35
0.31
0.27
0.24
0.20
0.16
0.12
0.08
0.04
0.00
Closed = up,
Open = down,
12345678
12345678

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
2-9
Installation and Setup, cont’d

Wiring the MLC/Power connector

The 12VDC, 1 amp power supply kit (part #70-055-01) is not included with the MLA-VC10.
MLC/RS-232
POWER
AB
MLA-VC10's front panel MLC/RS-232 Power port
White or white-striped wire
+12VDC
Ground ( )
An external power supply
B A
AB
MLS / Power
(12VDC, 1A max.)
Ground all devices
+12VDC
Ground ( )
B
Receive (Rx)
A
Transmit (Tx)
NOTE If you use cable that has a
drain wire, tie the drain wire to ground at both ends.
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.
+12VDC
Ground ( )
Transmit (Tx) Receive (Rx)
Connecting an MLA-VC10 to an MLC 206
NOTE
MLC 206's MLS/Power port
POWER/ STATUS
MLA-VC10
Front Panel
12VDC
Power Supply
ABCDEABC
DE ABC ABD
1A1B 2A2B 3A3B
Relays IR/RCM
123456
Tally Out
Extron Switcher Control
IR
RS-232
Display/Source Control
MLC 206 Bottom Panel
The external power supply provides power to both the MLA-VC10 and the MLC.
MLC/POWER
A B
MLC/RS-232
POWER
AB
MLA-VC10
MLA-VC10 front panel MLC/RS-232 Power port
+12VDC input
Ground ( )
White or white-striped wire
Ground all devices
An external power supply (12VDC, 1A max.)
Connecting an MLA-VC10 to an external power supply
33-644-01 A
07 01
Printed in the
USA
MLS
/Power
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.
The 12VDC, 1 amp power supply kit (part #70-055-01) is not included with the MLA-VC10.

Wiring the Amp/Mixer Control connector

The illustration below shows how to wire the 3.5 mm, 2-pole captive screw connector for controlling the amplifier or mixer.
AMP/MIXER
CONTROL
MLC/RS-232
POWER
AB
MLA-VC10's front panel MLC/RS-232 Power port
White or white-striped wire
+12VDC
Ground ( )
An external power supply
Ground all devices
Ground ( ) Ground ( )
B
Receive (Rx)
A
Transmit (Tx)
NOTE If you use cable that has a
drain wire, tie the drain wire to ground at both ends.
Transmit (Tx) Receive (Rx)
(12VDC, 1A max.)
B A
Rx Tx Gnd
Computer or
Third Party Control's
RS-232 Port
Connecting an MLA-VC10 to a Computer or Third Party Control's RS-232 Port
MLA-VC10 • Installation and Setup
Front Panel
12VDC
Power Supply
POWER/ STATUS
MLA-VC10
MLA-VC10
MLC/POWER
A B
Computer or
Third Party
Control's
RS-232 Port
CTRL
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 10VDC.
0VDC to +10VDC
Ground ( )
*
To Amplifier
6 feet (1.8 m) maximum between the MLA-VC10
and the amplifier
Wiring the MLA’s Amp/Mixer Control connector
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.
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.
MLA-VC10 • Installation and Setup
2-112-10
Installation and Setup, cont’d
ASCII to HEX Conversion Table

Operation

To control audio volume when using an MLA-VC10, turn a 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.

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
If you are using an MLC with the MLA-VC10, use the 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.
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)
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.
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 interface executes the 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 = 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.
MLA-VC10 • Installation and Setup
), which signals the end of the response
Symbol definitions
= CR/LF (carriage return/line feed) (hex 0D 0A)
= Space
X1
= Volume adjustment range (0 through 100%) = On/off status
X2
= Controller firmware version (listed to
X3
0 = off/disable 1 = on/enable
two decimal places e.g.: x.xx)
MLA-VC10 • Installation and Setup
2-132-12
Installation and Setup, cont’d
audio volume output.
Example: set volume to 82% of
Specify the % of maximum
X1
V Vol
X1
(host to MLC) (MLC to host)
maximum.
Increment audio volume.
X1
level.
Decrement audio volume.
Show the % of maximum audio
X1
X1
Unmute all audio outputs.
Show the status of audio mute.
X2
Show the MLA’s part #.
Show the firmware version.
X3

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.
(increase audio output) +V Vol
Example: 82V Vol082

Command/response table for SIS commands

Command ASCII Command Response Additional description
2-14
MLA-VC10 • Installation and Setup
Set the output volume
Volume adjustment
Increment
Decrement -V Vol
View the volume level V Vol
Mute on 1Z Amt1 Mute all audio outputs.
Mute off 0Z Amt0
Audio mute (overall)
View the audio mute status. Z Amt
Query firmware version number Q Ver
Request part number N N60-502-01
Firmware version, part number & information requests
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
2-15
Installation and Setup, cont’d
• The amplifier accepts a higher control voltage than the 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
1
5
2
3
ON
4
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.
UP
6
7
8
CONFIGURATION
1
5
2
6
3
7
4
8
DOWN
MLA-VC10
Appendix A
A
Specifications, Part Numbers,
2-16
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).
MLA-VC10 • Installation and Setup
and Accessories
Specifications
Included Parts
Cables
MLA-VC10 Functional Block Diagram
Specifications, Part Numbers, and Accessories

Specifications

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.

MLA-VC10 Functional Block Diagram

Voltage
Control
Amp/Mixer
+V
High Z
Low Z
Protection
Relay
Power Up Amp

Included Parts

These items are included in each order for an MLA-VC10:
Included parts Part number
MLA-VC10 60-502-01
3.8 mm, 2-pole captive screw connector 10-319-15
3.5 mm, 5-pole captive screw connector 10-319-10 MLA-VC10 user’s manual 68-690-01

Cables

Plenum Comm-link cable Part number
50 feet, 100 feet, 200 feet 26-461-01, -02, -03 300 feet, 400 feet 26-461-05, -04
A-2
MLA-VC10 • Specifications, Part Numbers, and Accessories
Microcontroller
MLA-VC10
RS-232/MLC Control
Pot.
Digital
Pot.
Digital
DC Voltage Controller
DIP Sw.
Sets Max Voltage
- Amp/Mixer must support remote volume capabilities.
Tx Rx Gnd+12V
MLA-VC10 • Specifications, Part Numbers, and Accessories
- 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.
A-3
Specifications, Part Numbers, Accessories, cont’d
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A-4 A-5
MLA-VC10 • Specifications, Part Numbers, and Accessories
MLA-VC10 • Specifications, Part Numbers, and Accessories
Specifications, Part Numbers, Accessories, cont’d
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A-6
MLA-VC10 • Specifications, Part Numbers, and Accessories
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