Extron Electronics MVC 121 - Manual (Page 23)

MVC 121 • Installation and Operation
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 chapter 3, the “Contact Closure Mute” section.
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
Transmit (Tx)
Receive (Rx)
Ground (Gnd, )
Tx Rx
RS-232
FIXED
L R
2-11