Extron Electronics MVC 121 - Manual (Page 26)

MVC 121 • Installation and Operation
Installation and Operation, cont’d
2-14
On/off status LEDs
If no adjustment of the front panel has occurred for 5 seconds,
the Gain/Volume level LEDs goes off. All the on/off status
LEDs next to each knob are active to indicate the current setting
(LED on indicates that the channel is on, LED off indicates that
the channel is muted or off).
Mute/unmute channel
A channel that has been muted by an SIS command can be
unmuted by turning the front panel knob clockwise.
For contact closure muted input, no front panel adjustment of
that input is allowed. Any attempt to adjust that input causes
the input’s status LED to blink 3 times.
Front panel security lockout (executive mode)
Executive mode is a security feature that prevents the front
panel knobs from being adjusted.
There are two forms of executive mode and each can only be
enabled/disabled via RS-232 commands. See chapter 3,
“Remote Control”, for command details.
1 . Executive mode 1: The Mic 1, Mic 2, and Main 3 input gain
control knobs on the front panel are locked, although the
Gain/Volume level LEDs still show the current gain
settings for those inputs if any of those three knobs are
rotated slightly. For a muted input, no gain/volume level
will be displayed. The individual LED for each input gain
control knob flashes three times if that knob is rotated
while in Executive mode 1.
The Master output volume control knob is not locked in
Executive mode 1.
2 . Executive mode 2: All four front panel volume control
knobs are locked, although the Gain/Volume level LEDs
still show the current gain/volume settings if any knobs
are rotated slightly. For a muted input, no gain/volume
level is displayed. The individual LED for each gain/
volume control knob flashes three times if that knob is
rotated while in Executive mode 2.