1 Introduction
The GLK12232-25-WBL comes equipped with the following features;
• 122 x 32 pixel graphics display
• Text display using built in or user supplied fonts
• Adjustable contrast
• Backlighting
• Keypad interface
• RS-232 or I
2
C communications
1.1 What to Expect From the GLK12232-25-WBL
The GLK12232-25-WBL is designed as the display unit for an associated controller. The controller may
be anything from a single board, special purpose micro-controller to a PC, depending on the application.
This controller is responsible for what is displayed on the screen of the display.
The display provides a simple command structure to allow both text and graphics to be transferred to the
screen. Text fonts and graphics, if desired, are stored in the display’s flash ROM and may be regarded as
’permanent’ in that they survive power-off periods and don’t change until explicitly reprogrammed.
The screen is backlit for low-light situations. Backlighting may be turned on or off under program
control. Contrast is adjustable to compensate for differing lighting conditions and viewing angles.
1.2 What Not to Expect From the GLK12232-25-WBL
Since the display is intended to be used with a controller, it does not have any built in text editing
functions. If a stream of ASCII characters is inputed they will be displayed, but the CR, LF, backspace, etc.,
will be ignored. If the user’s application requires these functions, they must be provided by the software in
the user’s controller, which can issue the appropriate positioning commands to the display.
1.3 Keypad Interface
The keypad interface takes row / column input and converts it to ASCII characters, which are delivered
out the RS-232 or I
2
C port to the associated controller. Note that the keypad is not used to directly control
any aspect of the operation of the display, which acts simply as a matrix to serial converter. In order to use
the keypad to control the display, the user must program their controller accordingly.
1.4 mogd.exe
Matrix Orbital has developed an interface program which exercises all the features of the display. It
is also used to manage font and graphics downloads. The program, called "mogd.exe", is provided on the
Matrix Orbital Cd and website.
To install mogd.exe follow these steps;
Matrix Orbital GLK12232-25-WBL 1
