Talk/Listen Communication; Talk Lock Mode; Page Mode - 3M C860 Service Information

Wireless Intercom System
In standard communication systems, the output from
the headset receiver is muted when the headset
transmitter is ON. This provides standard
(non- -duplex) communication (talk or listen).
In duplex communication systems, the output from
the headset receiver is enabled (not muted) when the
headset transmitter is ON. This provides duplex
communication (simultaneous talk and listen).
The two sets of transmitters and receivers work
together to provide audio communication between the
customer at the menu sign and the headset operators
inside the drive-through restaurant or between two or
more headset operators.
All audio transmitted by a headset during talk
operation is heard by:
Menu sign customers.
S
Personnel wearing active headsets.
S
People near the optional monitor speaker.
S
All audio from the menu sign is heard by:
Personnel wearing headsets that are operating in
S
the talk/listen mode.
People near the optional monitor speaker.
S

Talk/Listen Communication

Headset to Menu Sign
After the vehicle detection signal is presented to the
base station, the base station broadcasts a repeating
alert tone to all active headsets.
The headset operator presses and holds the talk button
to acknowledge the customer at the menu sign and
cancel the alert tone. When the headset operator
speaks into the microphone, the headset generates a
talk control tone and adds it to the microphone audio.
The microphone audio and talk control tone are then
transmitted to the base station. The talk control tone
turns the base station amplifier ON, which drives the
menu speaker enabling the customer to hear the audio.
When the base station receives the microphone audio
signal, it re-transmits it to all headset receivers. The
same microphone audio signal is also routed to the
monitor speaker amplifier if that option has been
selected.
E 3M 2003 March
Theory of Operation and Diagrams
n Note
The menu sign audio is not turned ON unless the
base station receives a talk control tone from the
headset. However, the the monitor amplifier is
always turned ON.
Menu Sign to Headset
When the customer at the menu sign speaks, audio is
detected by a microphone and sent through wire to the
transmitter and the monitor amplifier in the base
station.
The transmitter transmits the microphone audio to all
headset receivers. The monitor amplifier routes the
same microphone audio through wire to the optional
monitor speaker.
n Note
Personnel wearing headsets that are set to monitor
only page communications will not hear talk
communications.

Talk Lock Mode

The talk lock mode is used to operate "hands free." In
this mode, the headset automatically switches from
standby to talk/listen when a customer is detected at
the menu sign. The headset automatically switches
back to standby when the customer leaves the menu
sign. This mode is only available with duplex system
configurations.

Page Mode

When the headset page button is pressed, system
operation is identical to talk operation except for two
things:
The talk control tone is not broadcast, so the
S
menu sign amplifier is not turned on, muting
menu sign audio.
A page control tone is sent from the headset. The
S
transmitter rebroadcasts this tone to turn ON any
headsets that are in the page monitor mode. Any
audio detected by the headset microphone is
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