• Second, please ensure that the display module is set to communicate on the protocol that you are
using, by checking the Protocol Select Jumpers. To change the protocol used by the display module
see Section 2.3 on page 10.
• Third, ensure that the host system and display module are both communicating on the same baud rate.
The default baud rate for the display module is 19200 bps.
• If you are communicating to the display via I
2
C please ensure that the data is being sent to the correct
address. The default slave address for the display module is 0x50.
NOTE I
2
C communication will always require pull up resistors.
• Finally, you may reset the display to it’s default settings using the Manual Override Jumper, see
Section 2.5 on page 12.
3.3 The display module is communicating, however text cannot
be displayed.
• The cause of this is often that no font has been loaded onto the display. To load a font onto the display
see Section 4.2.1 on page 16.
• Another common cause may be that the contrast settings have been set to low. The solution to this
problem is to adjust the contrast settings, the default setting that will work in most environments is
128.
NOTE Optimal contrast settings mayvary accordingto factors suchas temperature, view-
ing angle and lighting conditions.
3.4 There is a problem uploading fonts or bitmaps.
• First, ensure that you can communicate to the display. A good test is to use a PC, with MOGD# in-
stalled, to connect to the display. See Section 1.4 on page 6 for setting up a PC to test the GLK24064-
25.
• Second, unsure that the File System Lock Jumper has not been set. See Section 2.6 on the previous
page.
• Third, please ensure that the display module’s memory is not full. The GLK24064-25 has 16 Kb of
memory for fonts and bitmaps.
NOTE If you are unable to resolve any issue please contact Matrix Orbital. See 15.5 on
page 61 for contact information.
Matrix Orbital GLK24064-25 14
