4communications, 4 there is a problem uploading fonts or bitmaps, 1 introduction – Matrix Orbital GLK12232-25-SM User Manual

Page 18

• If you are communicating to the display via I

C please ensure that the data is being sent to the correct

address. The default slave address for the display module is 0x50.

NOTE

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 10.

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 may vary according to factors such as 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#

installed, to connect to the display. See Section 1.4 on page 4for setting up a PC to test the GLK12232-
25-SM.

• Second, ensure that the Filesystem Lock Jumper has not been set. See Section 2.6 on page 11.
• Third, please ensure that the display module’s memory is not full. The GLK12232-25-SM has 16 Kb

of memory for fonts and bitmaps.

NOTE

If you are unable to resolve any issue please contact Matrix Orbital. See 16.6 on

page 64 for contact information.

Communications

4.1

Introduction

The commands listed in this chapter describe how to configure data flow on the GLK12232-25-SM.

Matrix Orbital

GLK12232-25-SM