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Technical Description
Man Machine Interface (MMI)
Keypad
The keypad has back-lighting that makes it possible to operate the station in the
dark. The back lighting function (on 10sec/on 20sec/off) is selected by the user.
Note that the END/PWR/NO key is not part of the keyboard scanning matrix. It is
connected to the 3.8V regulators enable inputs so that the power of GUSTAV is
forced On when this key is held down.
The volume keys are not located on the keypad. They are push button switches
mounted on the upper left hand side of the phone.
Display
The segmented LCD contains one row of 10 alpha-numeric characters and one row
of icons.
The software for driving the display is contained in the Flash EPROM.
An elastomeric connector joins the PCB to the transparent conductive tracks on the
LCD module.
Acoustic Signals
The acoustic signals are generated by a buzzer in the transceiver. The acoustic level
as well as the frequency of the signal is variable in order to distinguish between dif-
ferent situations.
The different acoustic signals are:
• Ring signals
• Alarm signals
• Low battery warning
• Keypad tone or "click"
Top LED Indicator
A dual-colour LED (green & red) is positioned on the top front end.
Each LED is connected to a separate output port on GUSTAV.
Blinking rates and color of the Indicator LED are controlled by software.
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