Extron Electronics MLA VC10 Plus User Guide - Manual (Page 8)

Inverse mode — In normal mode, 0 is mute and 10 VDC or 10 kilohm is the maximum
volume. In inverse mode, this reverses the output to 0 (maximum volume) to 10 VDC or
10 kilohm (minimum volume).
Relay switch — This switch has a Normally Open (NO) pin and a Normally Closed (NC)
pin. This relay can be used to mute audio on an amplifier or mixer.
Auto Mute — When the volume level is at 0, this feature allows the MLA VC10 Plus to
trigger this relay to mute the amplifier, via mute contact closure terminals on the amplifier.
By default this feature is enabled.
Soft Start — The audio level is gently ramped to restore volume to its previous level after
a mute or a power cycle to prevent loud bursts of sound and to protect the amplifier and
speakers from possible damage.
Isolation — Isolated digital circuitry prevents noise in the signal path. All control ports are
isolated from each other to eliminate induced noise.
RS-232 serial control — The MLA VC10 Plus can be controlled by Extron Simple
Instruction Set (SIS
™ ) commands either via the controller or directly from a PC using the
front panel USB port or the rear panel 3-pole captive screw connector.
Optional ENERGY STAR
® qualified power supply — This external universal power
supply (PS 1210 C, part number 70-775-01) provides worldwide compatibility, low power
consumption, and reduced operating costs.
RS-232
RELA
Y
V-DC
R
Tx Rx G
G
G
V C
NO
NC C
PO WE R
0.3A MA
X 12V
CONTR
OL
OUTPUT
REMO
TE
CONFIG
DISPL
AY
VOLUME
1
2
3
4
ON
OF F
MLC 104
IP PLUS
VCR
DVD
PC
XP A 100
2
1 2 LIMITER/PR
OTECT
SIGNAL OVE R
TEMP
Extron
MLC 104 IP Plus
MediaLink
Controller
Extron
MLA VC10 Plus
Volume Control Module
RS-232
Variable
Impedance
Output
Extron
XPA 1002
Power
Amplifier
Extron
SI 26
Surface-mount
Speakers
Figure 1. MLA VC10 Plus Application Diagram
MLA VC10 Plus • Introduction 2