User`s guide

3: Operation • 9
©2014 Axia Audio - Rev.1.3.8
new shift excludes the last 4 calls in memory, the CALL-
STACK OLED will return to the top level where the pre-
vious calls are listed along with the menus.
Volume Knob
The Volume knob has three different functions; ad-
just overall volume, adjust per channel volume, and ad-
just headset volume.
Overall – rotating the volume knob any time other
than by the methods dened below.
Per Channel – Holding down the Listen button while
adjusting the volume knob will adjust the volume for
that source loaded to the key. The setting is saved to the
source in volatile memory.
Headset – Pressing the knob in while rotating will
adjust the volume to the headset.
Mute Microphone (MUTE MIC)
The Mute Mic button will mute the audio inputs.
When engaged the LED will be illuminated red. If any
other station attempts to listen while the Mute Mic is
enabled, the audio received will be muted. This help to
ensure privacy to the operator of the intercom station. If
the Mute Mic is engaged and the station attempts to talk
to another station, the Mute Mic will be disengage.
Mute Speaker (MUTE SPKR)
The Mute Spkr button toggles the muting of the in-
ternal speaker. When muted, the red LED will illumi-
nate. Mute control is also available through GPIO. With
the Element module, the Mute Spkr button will mute the
audio that is delivered to the External Preview circuit.
Keypad
Select models have a dial keypad for use with future
versions of software.
External Sources
Intercom stations discover all other stations within
the network. This provides an ease in conguration, but
there are plenty of applications where a user needs to
interact with a source that is not another intercom sta-
tion. External source option allows for an intercom sta-
tion to interact with additional devices. Creating an ex-
ternal source denes an additional option which can be
dened to a key. Using the talk and listen states operates
the same for the operator, but behind the panel the ac-
tions are different. Conguration of external sources is
covered in the next chapter. Case examples are provided
at the end of this chapter.
GPIO
General Purpose Input/Output logic is provided in
intercom stations to allow for external triggering and
signaling. All stations have 8 virtual ports and a single
main port. Rackmout stations include an additional port
that is a physical GPIO port on the back panel. The 8 vir-
tual ports are used for external source triggering and are
dened as you congure an external source. The Main
GPIO port has predened functions as follows:
PIN FUNCTION
GPO Pin1 Mute Speaker command
GPO Pin2 Busy (also mutes speaker)
GPO Pin3
GPO Pin4
GPO Pin5
GPI Pin1 Listening Lamp
GPI Pin2
GPI Pin3 Ring Lamp
GPI Pin4 Mic Mute Lamp
GPI Pin5 Talking Lamp
Main GPIO port
The physical port on the back of a rackmount station
is intended to be given function by the use of GPIO port
routing. GPIO port routing is a feature present in Axia
products that links one port to another. By doing a port
route, the GPI activity of one port result in GPO activity
of the other:
GPI change of state in Port 1-> route (link)-> GPO
change of state in Port 2
So by routing the Main GPIO port to a physical port,
a “Ring Lamp” indication would be present on GPO pin
3 of the back panel GPIO. Likewise routing the physical
port to the Main port, rst GPI triggered on the physical