TB7100 Installation and Operation Manual Functional Description 33
© Tait Electronics Limited December 2005
Function Keys
Pressing the function keys will activate the functions assigned using the
programming application. Function keys may have functions assigned to
both short and long key presses. A short key press is less than one second,
and a long key press is more than one second.
Volume Control and
Internal Speaker
Rotate the volume control potentiometer clockwise to increase the speaker
volume and counterclockwise to decrease the volume. By default, the base
station is programmed not to generate any audible indicators.
UI Board The UI board is connected to the receiver and transmitter modules via
separate 18-way ribbon cables. The internal speaker is connected to the
UI board via a cable with a mating connector for easy disconnection.
If an internal AC Power supply is fitted, a fan power signal is routed from
the fan power board to the fan via the UI board. For more information on
the connectors and their signals, refer to “UI Board Connectors” on
page 75.
Figure 3.6 on page 34 shows a block diagram of the UI board.
The UI board does not include a microprocessor. A synchronous bi-
directional serial interface provides communication of key status, LCD and
LED-indicator data between the transmitter/receiver modules and the UI
board. The serial data is converted to or from a parallel form by a number
of shift registers for the function keys and indicators. For the LCD, the serial
data is fed to a driver IC that converts the serial data to a form suitable for
the LCD. The keys are scanned and the LCD and LED indicators updated
approximately every 50ms. The
TX/RX switch controls what is displayed on
the LCD and also whether the transmitter module or the receiver module
will be programmed.
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