Matrix Orbital GLK240128-25 Legacy - Manual (Page 8)

Figure 8: 4X4 Keypad
1.3 Features
• 240 x 128 pixel graphics display
• Selectable communication protocol, Serial at RS-232 or TTL levels or I
2 C
• 16 KB flash memory for fonts and bitmaps
• Lightning fast communication speeds, up to 115 kbps for RS-232 and 100 kbps for I
2 C
• Adjustable contrast and backlight brightness
• Extended temperature available for extreme environments of -20C to 70C
• Extended voltage and efficient power supply available
• Support for up to a twenty-five key matrix style keypad
1.4 Connecting to a PC
The GLK240128-25 connects seamlessly to a PC and it is an excellent means of testing the functionality
and uploading new fonts and bitmaps. You will require a standard RS-232 9-pin serial cable such as the one
pictured in
figure 6 on the previous page , as well as a modified 5V power adapter such as the one pictured in
figure 3 on the preceding page .
In order to connect your display to a personal computer follow these easy instructions:
1. Plug the serial cable into the com port you wish to use.
2. Connect the modified 5V power adapter to a power lead from your PC power supply (you will have to
open your computer case).
3. Connect the serial cable to the DB-9 connector on the back of the display.
4. Connect the 5V power adapter to the 4-pin connector on the back of the display.
Matrix Orbital GLK240128-25 3