Matrix Orbital GLK12232-25-SM Legacy - Manual (Page 4)

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1. Introduction
Your GLK12232-25-SM has 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
This manual describes the basic use and overview of the GLK12232-25-SM. It also describes advanced
functions, which may require soldering. We do expect you to be proficient with a soldering iron before
attempting to modify the unit. Any damage resulting from soldering irons or modifications will not be
covered under warrantee.
1.1 What it Does
The GLK12232-25-SM is designed as the display unit for an associated controller. The controller may be
anything from a single board, special purpose microcontroller to a PC, depending on the application. This
controller is responsible for what you see on the screen of the GLK12232-25-SM.
The GLK12232-25-SM 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 GLK12232-25-SM'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 it Does Not Do
Since the GLK12232-25-SM is intended to be used with a controller, it does not have any built-in text
editing functions. If you input a stream of ASCII characters they will be displayed, but the CR, LF,
backspace, etc. will be ignored. If your application needs these functions, they must be provided by the
software in your controller, which can issue the appropriate positioning commands to the GLK12232-25-
SM.
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 GLK12232-25-SM, which acts simply as a matrix to serial converter. If you
want to use the keypad to control the GLK12232-25-SM display you must program your controller
accordingly.
1.4 mogd.exe
Matrix-Orbital has developed an interface program which exercises all the features of the GLK12232-25-
SM. It is also used to manage font and graphics downloads. The program, called "mogd.exe", is provided
on CD and our website.
To install mogd.exe follow these steps: