Linx Technologies MDEV-GPS-R4 - Manual (Page 10)

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The Display Section
The R4/F4 Series Master Development System features an OLED screen
that displays the navigation information from the GPS module. This allows
the development board to act as a stand-alone evaluation system without
the need for any additional software.
The display is driven by an on-board microcontroller located under
the display. Data from the GPS module is connected directly to this
microcontroller. The microcontroller receives data at the receiver’s default
9,600bps. If the receiver’s baud rate is changed, it will not be able to
communicate with the microcontroller.
The display and microcontroller pull about 100mA when fully powered, so a
power switch is supplied to deactivate the display area when not in use,
saving battery life. To protect the display and extend its life, be sure to turn
the display section off before turning off the main power to the board.
Figure 8: The Development Board Display Section