User`s guide

2: Basic Setup and Operation • 8
Version 1.2 July 2010
Select control and Assign/Enter key. Those controls are
fully described in subsequent sections.
Volume
The rotary Volume control performs three functions.
• It is used to adjust the overall level of the loud-
speaker audio by simply rotating the control.
• When the Volume Control is rotated while push-
ing a Listen button, it adjusts the audio level of
only that source on the panel loudspeaker with-
out affecting the levels presented for that source
elsewhere in the system. When a channel is
removed from listen mode, the default level is
restored.
• The headphone level can be controlled by push-
ing the Volume control encoder and adjusting
the volume while pushed. When released, nor-
mal operation will resume.
Mute Microphone (MUTE MIC)
Tapping the Mute Microphone key alternately en-
ables and disables the microphone. The red LED illumi-
nates when the microphone is muted and extinguishes
when the microphone is active.
Whenever the intercom station is powered up, the
analog output and Livewire source may be active. If you
want the freedom of hands-free communication with
other stations, make sure the Mute Mic LED is not illu-
minated. Alternately, to ensure your privacy, you should
use the Mute Microphone function.
Mute Speaker (MUTE SPKR)
Tapping the Mute Speaker button alternately en-
ables and disables the audio from the local speaker. The
red LED illuminates when the speaker is muted and ex-
tinguishes when the local speaker is active. Note that the
speaker may also be muted by a contact closure to the
GPIO port input 2 (pin 12).
Select
The Select control is used for several functions:
• The Select control is used in injunction with the
Assign/Enter key to scroll and select from op-
tions in the Assign, Shift and Status menus. See
the section on the Assign key for the details of
Figure 2-1: IC.20 Front Panel Controls
Figure 2-2: IC.10X - Expander Chassis