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Control — Volume Control
Reference
voltage: ≤10 VDC
V
C
G
Control voltage output:
0 - 10 VDC
Rear Panel
IR
VOL
D IN
S
G
V
C
G
IN
G
Ground (Gnd)
G
C
Control voltage (variable output to amp from MLC Plus 84) – This signal controls the amp volume.
V
Reference voltage input (from ampli er) – This allows the MLC Plus 84 to detect when the amp is present.
Example:
Connecting to
Extron Amplifiers
VOL
MLC Plus 84
V
C
G
Rear
Panel
G
Ground
C
Control voltage
V
Reference voltage
Control, Unidirectional — Digital Input
Rear
Panel
Con gure the port with or without
+5 VDC pull-up.
VOL
D IN
RELAYS
Use this port to:
V
C
G
IN
G
1
2
C
• Monitor or trigger events and
functions (toggle relays, issue
commands, send e-mail), once
con gured.
• Power an LED, incandescent
light, or other device that
accepts a TTL signal.
Switch, Sensor, LED,
Relay, or Similar Item)
Volume Control
This port can be used to control the volume and mute or unmute the audio for some
Extron audio ampli ers with remote volume capability.
• Connect to an Extron audio ampi er
to permit volume control via the
MLC
.
Plus 84
Settings to configure via software:
• Maximum and minimum voltage
limits
XPA 1002
MPA 401 Series
MPA 181T,
MP 101 Series
REMOTE
10V
50mA
10V
50mA
REMOTE
G
10V
VOL/MUTE
V
C
G
V
C
G
MPA 152 Plus
MPA 152
REMOTE
V
C
G
10V
50mA
10V
C or VOL/MUTE
V or 10V
Digital Input
• Do not exceed 25 VDC input voltage.
• Soft Start mode: off or on (default) − to
allow volume to gradually increase from
mute to the previous level after muting
or power-on to prevent loud audio bursts
NOTE:
When audio mute is active, the MLC Plus 84
sets output voltage to 0 VDC, even if the voltage
range (minimum and maximum voltage limits) have
been set to levels above zero, such as 2 V to 8 V.
VOL/MUTE
50mA
G or
Control — Relay
Rear
Panel
D IN
RELAYS
IN
G
1
2
C
NOTE:
Use shielded cable and
place the MLC Plus 84 as close
as possible to the ampli er to
avoid picking up background
noise via the cable.
All relays are
normally open.
Relays
• Connect devices for relay control.
• Do not exceed a total of 24 V, 1 A
for each port.
Normally
Closed
Open
To Room
Control
Equipment
7
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