Matrix Orbital GLK12232-25-WBL - Manual (Page 8)

NOTES
• The keypad connector must be wired with columns on one side and rows on the other
side of the center of the connector. If the keypad isn’t wired this way, an adapter will
need to be made. Another method would be to rewire the connector to meet this
requirement.
• The connector is reversible. Reversing the connector will not damage the keypad or
the display, but will however, change the ASCII character map.
3. Press a key on the keypad. An upper case ASCII character (A-Y) should appear on the PC screen.
Different keys should generate different characters.
To experiment, reverse the connector and see if it generates a more logical set of characters. Ultimately, the
program in the micro-controller will have to ’map’ these characters to the ones marked on the keypad, which
will likely be different.
1.8 Manual Over-ride
Manual over-ride should only be required in one instance. If for some reason the module is set at a baud
rate which cannot be produced by the host system and all communication to the display is lost, then the user
should follow this simple procedure;
1. Turn off the display.
2. Put a jumper on pins 5 and 6 of the keypad connector.
3. Power up the display. The baud rate is now set to 19,200.
4. Remove the jumper and change the RS-232 port settings to the desired baud rate.
5. Turn off the display.
6. Power up the display.
NOTE This procedure does not change settings in the memory chip, it uses default set-
tings stored in the main processor. This allows the user to communicate with the display
when all other communications are lost. Once able to communicate with the display, the
user may then change the default settings in the memory chip.
2 Connectionshttp://www.atmel.com/dyn/resources/prod_doc
2.1 Connector Pinout
Refer to the diagram below for this chapter.
Matrix Orbital GLK12232-25-WBL 4