MVC 121 • Installation and Operation
MVC 121 • Installation and Operation
Installation and Operation
2-11
2-10
Front Panel Features
MIXER/VOLUME CONTROLLER
MVC 121
MIC 1
VO
L
MIC 2
MAIN 3
MASTER
2
1
3
4
5
1
All front panel control knobs are speed sensitive. Turn
the knob quickly to make coarse gain/volume
adjustments or slowly to make fine adjustments.
1
Gain/Volume level LEDs
— The four vertical LEDs indicate the
level setting of the last adjusted knob of the four front panel
volume control knobs for Mic 1, Mic 2, Main 3, and Master. If no
knob is adjusted within 5 seconds, all four
LEDs will turn off. Turning any of the
knobs clockwise will increase the gain/
volume setting, and turning any of the
knobs counterclockwise will decrease the
gain/volume setting. A higher gain/
volume level is indicated by more LEDs
being lit (from bottom to top).
When the Mic 1, Mic 2, and Main 3
maximum gain
setting is
reached (+12 dB), the top LED will flash three times. When the
minimum setting is reached (-79 dB) or if no knob is turned for 5
seconds, the four LEDs will be off until the next adjustment. The
default input gain setting is 0 dB. See the dB levels and the
corresponding LEDs in the illlustration.
When the
maximum volume
setting is
reached (92), the top LED will flash three
times. When the minimum setting is
reached (0) or if no knob is turned for 5
seconds, the four LEDs will be off until the
next adjustment. The default output
volume setting is 50. See the level and the
corresponding LEDs in the illustration on the right.
6
Fixed output connector
— The balanced/unbalanced stereo
output from this 5-pole 3.5 mm captive screw
connector is output at a fixed volume level for
input to a recording device. Volume level can be
adjusted at the recording device.
The Master volume control knob on the front panel
operates independently from the fixed output.
The Fixed output connector is wired the same as the Variable
output connector. See
5
, Variable output connector, for an
example application diagram with cabling instructions and a
caution.
Both the Fixed and Variable output connectors will
output audio simultaneously.
7
RS-232 connector
— Connect an RS-232 device
(control system or PC) to the 3-pole 3.5 mm
captive screw connector for two-way RS-232
communication.
Software for RS-232 control is included
with the MVC. See chapter 3,
Remote
Control
, for information on how to install
and use the control software and SIS commands.
8
Mute connector
— Connect a contact closure device
to the 6-pole 3.5 mm captive screw connector to mute
the inputs, as follows:
1.
Short and hold pin 1 to ground to mute Mic 1 input.
2.
Short and hold pin 2 to ground to mute Mic 2 input.
3.
Short and hold pin 3 to ground to mute Main 3 line level
input.
See the section
Contact Closure Mute
in chapter 3.
RS-232 and Mute share the same ground.
The associated input remains muted during the time period the
contact closure pin is shorted to ground and all the front panel
and RS-232 controls for that input are disabled. As soon as the
short is removed, the contact closure mute is disabled and the
other controls are enabled.
32
MUTE
1
2
3
VO
L
+12 dB maximum
+10 dB
0 dB (default)
-30 dB
-50 dB
VO
L
92 maximum
90
80
50 (default)
20
Transmit (Tx)
Receive (Rx)
Ground (Gnd, )
Tx Rx
RS-232
FIXED
L
R
im Vertrieb von
CAMBOARD Electronics
www.camboard.de
Tel. 07131 911201
Fax 07131 911203
