Matrix Hairstyles GLK24064-25 User Manual

GLK24064-25

Technical Manual

Revision: 3.0

Contents

Contents ii

1 Getting Started 1

1.1 Display Options Available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.2 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.4 Connecting to a PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.5 Installing the Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.5.1 MOGD# . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2 Hardware Information 8

2.1 DB-9 Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1.1 Power Through DB-9 Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.2 Power/Data Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.2.1 Legacy Data Connector Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.3 Protocol Select Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.4 Keypad Interface Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.5 Manual Override . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.6 Filesystem Lock Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3 Troubleshooting 13

3.1 The display does not turn on when power is applied. . . . . . . . . . . . . . . . . . . . . . . 13

3.2 The display module is not communicating. . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.3 The display module is communicating, however text cannot be displayed. . . . . . . . . . . 14

3.4 There is a problem uploading fonts or bitmaps. . . . . . . . . . . . . . . . . . . . . . . . . 14

4 Communications 15

4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.1.1 I2C Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.1.2 Serial Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.2 Turn Flow Control On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.3 Turn Flow Control Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.4 Changing the I2C Slave Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.5 Changing the Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.6 Setting a Non-Standard Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5 Fonts 19

5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.1.1 Font File Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.1.2 Creating a Font . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.2 Uploading a Font File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.3 Setting the Current Font . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.4 Font Metrics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.5 Set Box Space Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Matrix Orbital GLK24064-25 ii

6 Text 24

6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

6.2 Move Cursor Home . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

6.3 Setting the Cursor Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

6.4 Setting the Cursor Coordinate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.5 Auto Scroll On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.6 Auto Scroll Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

7 Bitmaps 26

7.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

7.2 Uploading a Bitmap File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

7.3 Drawing a Bitmap from Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

7.4 Drawing a Bitmap Directly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

8 Bar Graphs and Drawing 28

8.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

8.2 Set Drawing Color . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

8.3 Draw Pixel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

8.4 Drawing a Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

8.5 Continue a Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

8.6 Draw a Rectangle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

8.7 Drawing a Solid Rectangle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

8.8 Initializing a Bar Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

8.9 Drawing a Bar Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

8.10 Initializing a Strip Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

8.11 Shifting a Strip Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

9 Keypad 35

9.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

9.2 Auto Transmit Keypresses On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

9.3 Auto Transmit Keypresses Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

9.4 Poll Key Press . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

9.5 Clear Key Buffer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

9.6 Set Debounce Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

9.7 Set Auto Repeat Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

9.8 Auto Repeat Mode Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

9.9 Assign Keypad Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

10 Display Functions 39

10.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

10.2 Clear Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

10.3 Backlight On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

10.4 Backlight Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

10.5 Set Backlight Brightness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

10.6 Set and Save Backlight Brightness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

10.7 Set Contrast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

10.8 Set and Save Contrast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Matrix Orbital GLK24064-25 iii

11 Filesystem 43

11.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

11.1.1 File Upload Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

11.2 Wipe Filesystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

11.3 Deleting a File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

11.4 Get Filesystem Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

11.5 Get Filesystem Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

11.6 Downloading a File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

11.7 Moving a File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

12 Data Security 47

12.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

12.2 Set Remember . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

12.3 Data Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

12.4 Set and Save Data Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

13 Miscellaneous 50

13.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

13.2 Read Version Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

13.3 Read Module Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

14 Command Summary 52

14.1 Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

14.2 Fonts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

14.3 Text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

14.4 Bitmaps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

14.5 Bar Graphs and Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

14.6 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

14.7 Display Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

14.8 Filesystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

14.9 Data Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

14.10Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

14.11Command By Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

15 Appendix 59

15.1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

15.1.1 Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

15.1.2 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

15.2 Optical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

15.3 Physical Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

15.4 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

15.5 Contacting Matrix Orbital . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Matrix Orbital GLK24064-25 iv

1 Getting Started

Figure 1: GLK24064-25-WB

The GLK24064-25 is an intelligent graphic LCD display designed to decrease development time by
providing an instant solution to any project. With the ability to communicate via serial RS-232/TTL and I2C
protocols, the versatile GLK24064-25 can be used with virtually any controller. The ease of use is further
enhanced by an intuitive command structure to allow display settings such as backlight brightness, contrast
and baud rate to be software controlled. Additionally, text and fonts may be uploaded to the display and
stored in the on board memory.

1.1 Display Options Available

The GLK24064-25 comes in a variety of colors including the standard yellow/green, the popular blue/white
and the crisp white/grey. Extended voltage, and temperature options are also available, to allow you to select
the display which will best fit your project needs.

Figure 2: GLK24064-25 Options

Matrix Orbital GLK24064-25 1

1.2 Accessories

NOTE Matrix Orbital provides all the interface accessories needed to get your display

up and running. You will find these accessories and others on our e-commerce website at
http://www.matrixorbital.com. To speak with a sales associate see Section 15.5 on page 61
for contact information.

Figure 3: 5V Power Cable Adapter

Figure 4: 12V Power Cable Adapter (V/VPT Models)

Matrix Orbital GLK24064-25 2

Figure 5: Breadboard Cable

Figure 6: Serial Cable 4FT

Matrix Orbital GLK24064-25 3

Figure 7: Communication and 5V Power Cable

Figure 8: 4X4 Keypad

Matrix Orbital GLK24064-25 4

1.3 Features

• 240 x 64 pixel graphics display

• Selectable communication protocol, RS-232 or I2C

• 128 byte buffered communication

• 5V - 20mA General Purpose Output

• 16 KB flash memory for fonts and bitmaps

• Lightning fast communication speeds, up to 115 kbps for RS-232 and 400 kbps for I2C

• Display text using built in or user supplied fonts

• Adjustable contrast

• Adjustable backlight brightness

• Default 19.2 kbps serial communication speed

• 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

Matrix Orbital GLK24064-25 5

1.4 Connecting to a PC

The GLK24064-25 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 page 3, as well as a modified 5V power adapter such as the one pictured in figure 3 on

page 2.

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.

WARNING DO NOT use the standard floppy drive power connector,
as this will not provide you with the correct voltage and will damage the
display module.

Figure 9: PC vs Matrix Orbital Display Module Wiring

Matrix Orbital GLK24064-25 6

1.5 Installing the Software

1.5.1 MOGD#

MOGD# is the latest updated version of MOGD and can be used to manage font and graphics downloads
as well as exercise all of the features of our graphical displays. MOGD# provides a new user friendly
interface as well as many feature enhancements.

To install MOGD# from the Matrix Orbital CD, follow the following steps:

1. Insert the Matrix Orbital Cd-ROM into the Cd drive

2. Locate the file MogdSharp.zip, which should be in the “cd-drive:\Download” directory

3. Unzip MogdSharp.zip to a temporary directory using a program such as Winzip, Pkzip, etc.

4. Double click on "setup.exe"

5. Follow the instructions on the screen to complete the installation

6. MOGD# requires the .NET framework 2.0 and will download and install it automatically

After the installation is complete there will be a Matrix Orbital entry under “Start->Programs->Matrix Or­bital” in the start menu. Click on the ’Mogd Sharp’ entry to run the program.

Be sure to check the information selected in the configuration panel the first time MOGD# is run.
Once this information is entered correctly the program can be used to control all functions of the graphic
display.speed=17.391-1

speed=16.391

Port The serial port the display is plugged in to.

Speed The communication speed the display

module is set to. (Default 19,200)

Display Type The type of display. (GLK24064-25)

PCB Revision The revision of the display you are using.

(Found on the back of the PCB)

Figure 10: Mogd Sharp Settings

NOTES

• MOGD# may also be downloaded from Matrix Orbital’s support site at

http://www.matrixorbital.ca/software/software_graphic/MogdSharp

• Winzip is available as a free download from http://www.winzip.com

Matrix Orbital GLK24064-25 7

2 Hardware Information

Refer to the following diagram for this chapter:

1 DB-9 Connector 6 Legacy Connector Jumper
2 Power Through DB9 Jumper 7 Protocol Select Jumpers
3 Manual Override 8 File System Lock Jumper
4 Keypad Interface Connector
5 Power / Data Connector

Figure 11: GLK24064-25

2.1 DB-9 Connector

The GLK24064-25 provides a DB-9 Connector to readily interface with serial devices which use the
EIA232 standard signal levels of ±12V to ±12V. It is also possible to communicate at TTL levels of 0 to
+5V by setting the Protocol Select Jumpers to TTL. As an added feature it is also possible to apply power
through pin 9 of the DB-9 Connector in order to reduce cable clutter. However, in order to accomplish this
you must set the Power Through DB-9 Jumper.

Pin 2 Rx \ SCL (I2C clock)
Pin 3 Tx \ SDA (I2C data)
Pin 5 GND

Pin 9 PWR (Must solder Power Through DB-

9 Jumper. See table 1 on page 10 for
power requirements.)

Figure 12: RS-232 Pin-out

Matrix Orbital GLK24064-25 8

2.1.1 Power Through DB-9 Jumper

In order to provide power through pin 9 of the DB-9 Connector you must place a solder jumper on the
Power through DB-9 Jumper pictured in figure 13 below. The GLK24064-25 allows all voltage models to use

the power through DB-9 option, see table 1 on the following page for display module voltage requirements.

Figure 13: Power Through DB-9 Jumper

WARNING Do not apply voltage through pin 9 of the DB-9 connector
AND through the Power/Data Connector at the same time.

2.2 Power/Data Connector

The Power/Data Connector provides a standard connector for powering the display module. The GLK24064-
25 requires five volts for the standard display module, between nine to fifteen for the wide voltage (V) and
between nine to thirty-five volts for the wide voltage with efficient power supply module (VPT). The volt­age is applied through pins one and four of the four pin Power/Data connector. Pins two and three are
reserved for serial transmission, using either the RS-232/TTL or the I2C protocol, depending on what has
been selected by the Protocol Select Jumpers. Pins two and three may be reversed by changing the Legacy
Connector Jumpers in order to be compatible with previous PCB revisions.

Pin 1 PWR (See table 1 on the next

page)

Pin 2 Rx \ SCL (I2C clock)
Pin 3 Tx \ SDA (I2C data)
Pin 4 GND

Figure 14: Power Connector and Pin-out

Matrix Orbital GLK24064-25 9

Table 1: Power Requirements

Standard -V -VPT

Supply Voltage +5Vdc ±0.25V +9V to +15V +9V to +35V

Supply Current 31 mA typical

Supply Backlight Current 160 mA typical

WARNINGS

• Do not apply any power with reversed polarization.

• Do not apply any voltage other than the specified voltage.

2.2.1 Legacy Data Connector Jumpers

To reverse pins two and three of the Power/Data Connector remove the zero ohm resistors from the
Legacy Data Connector Jumpers, labeled with the = symbol and place them on the jumpers labeled with

the X symbol. This will allow you to transmit on pin two, and receive data on pin three as pictured in figure

15 below.

Power/Data Connector

=[

x[

Figure 15: Legacy Data Connector Jumpers

Pin 2 Rx \ SCL (I2C clock)
Pin 3 Tx \ SDA (I2C data)

Pin 2 Tx \ SDA (I2C data)
Pin 3 Rx \ SCL (I2C clock)

2.3 Protocol Select Jumpers

The Protocol Select Jumpers, pictured below in figure 16, provide the means necessary to toggle the
display module between RS-232, TTL and I2C protocols. As a default, the jumpers are set to RS-232 mode
with zero ohm resistors on the 232 jumpers. In order to place the display module in I2C mode you must
first remove the zero ohm resistors from the 232 jumpers and then solder the resistors on to the I2C jumpers.
The display will now be in I2C mode and have a default slave address of 0x50 unless it has been changed.

Matrix Orbital GLK24064-25 10

Similarly, in order to change the display to TTL mode, simply remove the zero ohm resistors from the 232
or I2C jumpers and solder them to the TTL jumpers.

Figure 16: Protocol Select Jumpers

2.4 Keypad Interface Connector

The GLK24064-25 provides a Keypad Interface Connector which allows for up to a five by five matrix
style keypad to be directly connected to the display module. Key presses are generated when a short is
detected between a row and a column. When a key press is generated a character, which is associated with
the particular key press, is automatically sent on the Tx communication line. If the display module is running
in I2C mode, the “Auto Transmit Keypress” function may be turned off, to allow the key presses to remain
in the buffer so that they may be polled. The character that is associated with each key press may also be
altered using the “Assign Key Codes” command, for more detailed information see the Keypad Section, on
page 35.

Figure 17: Keypad Interface Connector

Matrix Orbital GLK24064-25 11

2.5 Manual Override

The Manual Override is provided to allow the GLK24064-25 to be reset to factory defaults. This can be
particularly helpful if the display module has been set to an unknown baud rate or I2C Slave Address and
you are no longer able to communicate with it. If you wish to return the module to its default settings you
must:

1. Power off the display module.

2. Place a Jumper on the Manual Override pins 1 and 2 as pictured below.

3. Power up the display module.

4. The display module is now set to its default values listed below in table 2.

5. Edit and save settings.

Figure 18: Manual Override Jumper

Table 2: Default Values

Contrast 128
Backlight 255
Baud Rate 19.2 kbps
I2C Slave Address 0x50
Data Lock False
RS232AutoTransmitData True

NOTE The display module will revert back to the old settings once turned off, unless the
settings are saved.

Matrix Orbital GLK24064-25 12

2.6 Filesystem Lock Jumper

The File System Lock Jumper allows you to lock the file system on the GLK24064-25 so that no fonts or
bitmaps can be either written or deleted from the on board memory. This feature is useful in order to protect
data integrity of production units, if protection of other settings is required see Section 12.1.

To lock the file system, solder a zero ohm resistor or use a solder jumper on the Filesystem Lock Jumper
pictured in figure 19 below.

Figure 19: File System Lock Jumper

3 Troubleshooting

3.1 The display does not turn on when power is applied.

• First, you will want to make sure that you are using the correct power connector. Standard floppy

drive power cables from your PC power supply may fit on the Power/Data Connector however they do
not have the correct pin-out as can be seen in figure 9 on page 6. Matrix Orbital supplies power cable
adapters for connecting to a PC, which can be found in the Accessories Section on page 2.

• The next step is to check the power cable which you are using for continuity. If you don’t have an

ohm meter, try using a different power cable, if this does not help try using a different power supply.

• The last step will be to check the Power / Data Connector on the GLK24064-25. If the Power / Data

Connector has become loose, or you are unable to resolve the issue, please contact Matrix Orbital

see 15.5 on page 61 for contact information.

3.2 The display module is not communicating.

• First, check the communication cable for continuity. If you don’t have an ohm meter, try using a

different communication cable. If you are using a PC try using a different Com port.

Matrix Orbital GLK24064-25 13

• 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 I2C please ensure that the data is being sent to the correct

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

NOTE I2C 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 may vary according to factors such as temperature, view­ing 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

4 Communications

4.1 Introduction

The commands listed in this chapter describe how to configure data flow on the RS232/TTL and I2C
port. The display has built in flow control which may be useful when long strings of text are downloaded to
the display. Flow control is enabled or disabled by two commands. If flow control is enabled, the display
will return an "almost full" message (0xFE) to the controller when its internal buffer fills to a defined level,
and an "almost empty" message (0xFF) when the buffer contents drop to a defined level.

4.1.1 I2C Communication

The GLC25064 is capable of communicating at 400 Kbps in I2C mode, with 127 units addressable on
a single I2C communication line. However, in order to communicate via I2C you must first set the Protocol
Select Jumpers as can be seen in Section 2.3 and ensure that pull up resistors, with a nominal value of 1K to
10K, are placed on the SCL SDA communication lines coming from pins two and three of the Data / Power
Connector respectively. The GLK24064-25 uses 8-bit addressing, with the 8th bit designated as the read
write bit, a 0 designates a write address and a 1 designates a read address. The default read address of the
display module will be 0x51, whereas the write address is 0x50 by default, to change the I2C address see
section 8.2.1.

When communicating in I2C the GLK24064-25 will send an ACK on the 9th clock cycle when addressed.
When writing to the display module, the display will respond with a ACK when the write has successfully
been completed. However if the buffer has been filled, or the module is too busy processing data it will
respond with a NAK. When performing a multiple byte read within one I2C transaction, each byte read from
the slave should be followed by an ACK to indicate that the master still needs data, and a NAK to indicate
that the transmission is over.

4.1.2 Serial Communication

In addition to being able to communicate via I2C the GLK24064-25 communicates natively through the
RS-232 protocol at a default baud rate of 19,200 bps and is capable of standard baud rates from 9600 to
115200 bps. Furthermore the GLK24064-25 is also capable of reproducing any non-standard baud rate in
between using values entered into our baud rate generation algorithm and set through command 164 (0xA4).
The display module communicates at standard voltage levels of . at ±12V to ±12V or at TTL levels of 0 to
+5V by setting the Protocol Select Jumpers to TTL.

Matrix Orbital GLK24064-25 15

4.2 Turn Flow Control On

Syntax

Parameters

Description This command enables flow control. When the buffer fills so that only

Hexadecimal 0xFE 0x3A [full] [empty]
Decimal 254 58 [full] [empty]
ASCII 254 “:” [full] [empty]

Parameter Length Description
full 1 The upper limit to issue an
empty 1 The lower limit to issue an

[full] bytes are available, the display will return an “almost full” mes­sage (0xFE) to the host controller. When the buffer empties so that only
[empty] bytes remain, the display will return an “almost empty” message
(0xFF) to the host controller.
The display will return the “almost full” message for every byte sent to
the display until the used buffer space once more drops below the [full]
level. Whether the user is in ‘flow control mode’ or not, the module will
ignore display or command bytes which would overrun the buffer. While
in ‘flow control mode’ the unit will return 0xFE when buffer is almost
full even though it may have already thrown rejected data away. The
buffer size for the display is 80 bytes.
When using this command in an application, selection of the value for
the buffer [full] should be considered very carefully. This is a critical
aspect to be able to use this feature to it’s full potential. When using a
host system or PC which contains a FIFO, the user should set the value
of [full] equal to or greater than the size of the FIFO. The reason for this
is that the FIFO may be full when the host system receives 0xFE. In the
case of 16550 UART the size at its maximum is 16, therefore the value
of [full] should be set to 16 or greater.

Remembered No

Factory Default Off

4.3 Turn Flow Control Off

Syntax

Matrix Orbital GLK24064-25 16

Hexadecimal 0xFE 0x3B
Decimal 254 59
ASCII 254 “;”

Description This command turns off flow control. Bytes may overflow the buffer

without warning.

Remembered No

4.4 Changing the I2C Slave Address

Syntax

Parameters

Description This command sets the I2C write address of the module between 0x00

Remembered Always

Factory Default 0x50

Hexadecimal 0xFE 0x33 [adr]
Decimal 254 51 [adr]
ASCII 254 “3” [adr]

Parameter Length Description
adr 1 The new I2C write address (0x00 -

0xFF).

and 0xFF. The I2C write address must be an even number and the read
address is automatically set to one higher. For example if the I2C write
address is set to 0x50, then the read address is 0x51.

NOTE The change in address is immediate.

4.5 Changing the Baud Rate

Syntax

Parameters

Description Data Security

Matrix Orbital GLK24064-25 17

Hexadecimal 0xFE 0x39 [speed]
Decimal 254 57 [speed]
ASCII 254 “9” [speed]

Parameter Length Description
speed 1 Hex value corresponding to a baud

rate.

Remembered Always

Factory Default 0x50

4.6 Setting a Non-Standard Baud Rate

Syntax

Hexadecimal 0xFE 0xA4 [speed]
Decimal 254 164 [speed]

Parameters

Parameter Length Description
speed 2 Inputed LSB MSB from baud rate

formula (12-2047).

Description This command sets the RS-232 port to a non-standard baud rate. The

command accepts a two byte parameter that goes directly into the mod­ules baud generator. Use the formula, speed =

16,000,000

8×DesiredBaud

− 1 to cal­culate the [speed] for any baud rate setting. The speed can be anywhere
from 12 to 2047 which corresponds to a baud range of 977 to 153,800
baud. Setting the baud rate out of this range could cause the display to
stop working properly and require the Manual Override jumper to be set.

Remembered Always

Examples

speed = 17.391− 1

speed =

16, 000, 000

8 × DesiredBaud

−1

speed = 16.391

speed =

16, 000, 000

8 × 115, 000

−1

LSB = 16

MSB = 0

NOTE Results from the formula are rounded to the nearest whole number.

Matrix Orbital GLK24064-25 18

5 Fonts

5.1 Introduction

The GLK24064-25 comes loaded with the ’Small Filled’ and ’Futura Bk BT 16’ fonts by default how­ever, it is capable of displaying any font that is uploaded to it in the correct format. MOGD# provides a
simple method of generating font files from your installed fonts. For instructions on how to install MOGD#
see Section 1.5.1 on page 7.

5.1.1 Font File Format

A font file consists of three parts, a header, a character table and bitmap data.

1. Header (4 bytes)

(a) Nominal Width (1 byte)
(b) Height (1 byte)
(c) ASCII Start Value (1 byte)
(d) ASCII End Value (1 byte)

2. Character Table (3 bytes for every character between the ASCII Start and End values inclusive)

(a) High Offset LSB (1 byte)
(b) Low Offset MSB(1 byte)
(c) Character Width (1 byte)

3. Bitmap Data

5.1.2 Creating a Font

The following is an example of how to create a font file for the letters h, i and j.

First you must create the bitmaps containing the character data in bitmap form. Figure 20 below illus­trates the bit pattern for the h, i and j bitmap data.

Figure 20: Bitmaps for h, i, and j

Second you may begin to create the font file starting with the header. The header will contain the nominal
width, the height and the ASCII start and end values inclusive that you wish to create characters for.

Matrix Orbital GLK24064-25 19

Character Data

Character Data Byte Size (For Reference)

h 0x84 0x2D 0x98 0xC6 0x20 0x05

i 0x43 0x24 0x84 0x03
j 0x2D 0x98 0x19 0x60 0x04

Table 8: Font File Header

Nominal Width Height ASCII Start Val ASCII End Val

0x05 0x07 0x49 0x4B

Next we will have to find out how many bytes each character will use up, in order to create the character
table. The bitmaps are encoded horizontally and may have variable widths, h has a width of five, i a width
of three and j a width of four, see the figure below for an example of encoding the first letter h:

Bitmap Data Byte Hex Value

1 0 0 0 0
1 0 0 0 0 10000100 0x84

1 0 1 1 0 00101101 0x2D
1 1 0 0 1 10011000 Fonts

1 0 0 0 1 11000110 0xC6

1 0 0 0 1 00100000 0x20
1 0 0 0 1

Figure 21: Bitmap Encoding

As you can see the letter h will take up five bytes with the last three bits being zero padded to form a full

byte. So if you continue the process you will get the character data as seen in table 5.1.2.

The second part of the font file is the character table. The character table is comprised of three bytes for

every glyph in the font file.

The first two bytes represents the position, in bytes, of the glyph stored MSB LSB referenced from the
beginning of the file including the header. The third byte is the width of the glyph in pixels. So because there
will be 0x09 bytes in the character table (three bytes for each glyph) and four bytes in the header section,
the first entry in the table will be 13, or 0x00 0x0D in hexadecimal, and 0x05 for the width.

To calculate the second entry in the character table, representing the position and width of the second
glyph, take the offset of the first entry and add the size of the first bitmap in bytes. Since the first glyph
occupies 0x05 bytes as seen in table 5.1.2 above, and the offset is 0x00 0x0D, the offset of the second entry
will be 0x00 0x12 and the width of the glyph is 0x03.

Calculate the third entry the same way as the second to get table 9 below.

Matrix Orbital GLK24064-25 20

Table 9: Character Table

High Offset (MSB) Low Offset (LSB) Character Width

h 0x00 0x0D 0x05

i 0x00 0x12 0x03
j 0x00 0x15 0x04

Once completed, place the character table after the header and the character data at the end, as seen in
table 10.

Table 10: Sample Font File

0x05 0x07 0x49 0x4B 0x00 0x0D 0x05 0x00

0x12 0x03 0x00 0x15 0x04 0x84 0x2D 0x98

0xC6 0x20 0x43 0x24 0x84 0x2D 0x98 0x19

0x60

Red = Header

Blue = Character Table

Purple = Character Data

5.2 Uploading a Font File

Syntax

Parameters

Matrix Orbital GLK24064-25 21

Hexadecimal 0xFE 0x24 [refID] [size] [data]
Decimal 254 36 [refID] [size] [data]
ASCII 254 “$” [refID] [size] [data]

Parameter Length Description
refID 1 A unique font identification

number.
size 2 Font file size (LSB to MSB).
data x Font file data.

Description In order to upload a font to the GLK24064-25 you must first initiate the

upload font file command (0xFE 0x24), you must then pass it a reference
identification number, which must be unique for every font on the display
module. You may then pass the display module the two byte file size,
which needs to be transfered LSB, then MSB. The last part of uploading
a font is transmitting the font file data.
For detailed instructions on uploading a file to the GLK24064-25 see
Section 11.1 on page 43.

Remembered Always

5.3 Setting the Current Font

Syntax

Parameters

Description In order to set the font on the GLK24064-25 you must know the font

Remembered Always

Hexadecimal 0xFE 0x31 [refID]
Decimal 254 49 [refID]
ASCII 254 “1” [refID]

Parameter Length Description
refID 1 A unique font identification

number.

identification number of the font that you wish to use. The font ID is
established when the font is saved to the display. The default installed
fonts are “Small Filled” and “Futura Bk BT 16” and their font ID’s are
0x01 and 0x02 respectfully. Once you are aware of the font ID for the
font that you wish you use, simply send the command bytes (0xFE 0x31)
and then send the font ID corresponding to the font you wish to use. A
directory listing of the contents of the entire filesystem may be obtained
by using the “Get Filesystem Directory” command, see Section 11.5 on
page 46 for more detailed information.

5.4 Font Metrics

Syntax

Matrix Orbital GLK24064-25 22

Hexadecimal 0xFE 0x32 [lm] [tm] [csp] [lsp] [srow]
Decimal 254 50 [lm] [tm] [csp] [lsp] [srow]
ASCII 254 “2” [lm] [tm] [csp] [lsp] [srow]

Parameters

Description Font metrics define where the characters are positioned on the

Remembered Yes

Parameter Length Description
lm 1 Left margin: Location in pixels.
tm 1 Top margin: Location in pixels.
csp 1 Character Spacing: Amount of

space in pixels between characters.
lsp 1 Line Spacing: Amount of space

between lines in pixels.
srow 1 Scroll Row: The Y location of the

last row in pixels.

screen, by setting where the rows and columns begin based on the
[lm][tm][csp][lsp][srow] parameters. [lm] defines the leftmost position
and [tm] the topmost. [csp] controls the amount of pixels that are placed
in between characters and [lsp] controls the amount of pixels that are
placed in between lines. [srow] is the location of the top of the last row
that will be displayed on the GLK24064-25. It defines the row that, when
filled, will cause the display to auto scroll if auto scrolling is enabled.
The font metrics will have to be reconfigured after changing to a differ­ent font.

5.5 Set Box Space Mode

Syntax

Parameters

Description This command will toggle the box space mode. Box space mode is when

Remembered Yes

Factory Default Off

Matrix Orbital GLK24064-25 23

Hexadecimal 0xFE 0xAC [value]
Decimal 254 172 [value]

Parameter Length Description
value 1 Value (0: Off, 1: On)

a box, the size of the character to be written, is printed to the display
before a character is written.

6 Text

6.1 Introduction

The GLK24064-25 is an intelligent display module, designed to reduce the amount of code necessary
to begin displaying data. This means that it is able to display all characters and strings that are sent to it,
which are defined in the current font, without much, if any configuration. The display module will begin
displaying text at the top left corner of the display area, known as home, and continue to print to the display
as if it was a page on a typewriter. When the text reaches the bottom right, as defined in the font metrics, it
will automatically scroll all of the lines up and continue to display text.

6.2 Move Cursor Home

Syntax

Description This command moves the text insertion point to the top left of the display

Remembered No

Hexadecimal 0xFE 0x48
Decimal 254 72
ASCII 254 “H”

area, based on the current font metrics see Section 5.4 on page 22.

6.3 Setting the Cursor Position

Syntax

Parameters

Description This command sets the text insertion point to the [col] and [row] speci-

Hexadecimal 0xFE 0x47 [col] [row]
Decimal 254 71 [col] [row]
ASCII 254 “G” [col] [row]

Parameter Length Description
col 1 Column
row 1 Row

fied. The insertion point is positioned using the base size of the current
font (this command does not position the insertion point at a specific
pixel). The pixel column used is determined by multiplying the width of
the widest character in the font by the [column]. The pixel row used is
determined by multiplying the height of the font by [row + Metrics: line
spacing].

Matrix Orbital GLK24064-25 24

Remembered No

6.4 Setting the Cursor Coordinate

Syntax

Parameters

Description This command positions the insertion point at a specific pixel (X,Y),

Remembered No

Hexadecimal 0xFE 0x79 [col] [row]
Decimal 254 121 [col] [row]
ASCII 254 “y” [col] [row]

Parameter Length Description
col 1 Column
row 1 Row

which references the top left corner of the font insertion point.

6.5 Auto Scroll On

Syntax

Hexadecimal 0xFE 0x51
Decimal 254 81
ASCII 254 “Q”

Description When auto scrolling is on, it causes the display to shift the entire display’s

contents up to make room for a new line of text when the text reaches
the end of the scroll row defined in the font metrics (the bottom right
character position) see Section 5.4 on page 22.

Remembered Yes

Factory Default On

Matrix Orbital GLK24064-25 25

6.6 Auto Scroll Off

Syntax

Description When auto scrolling is disabled, text will wrap to the top left corner of

Remembered Yes

Factory Default On

Hexadecimal 0xFE 0x52
Decimal 254 82
ASCII 254 “R”

the display area when the text reaches the end of the scroll row defined in
the font metrics (the bottom right character position) see Section 5.4 on
page 22. Existing text in the display area is not erased before new text is
placed. A series of spaces followed by a “Cursor Home” command may
be used to erase the top line of text.

7 Bitmaps

7.1 Introduction

One of the main features of the GLK24064-25 is its ability to display bitmap images, that are either
loaded onto its on board memory, or written directly to the screen. This chapter will cover creating a bitmap,
uploading the bitmap, as well as drawing the bitmap from memory and directly.

7.2 Uploading a Bitmap File

Syntax

Parameters

Matrix Orbital GLK24064-25 26

Hexadecimal 0xFE 0x5E [refID] [size] [data]
Decimal 254 94 [refID] [size] [data]
ASCII 254 “^” [refID] [size] [data]

Parameter Length Description
refID 1 A unique bitmap identification

number.
size 2 Bitmap file size (LSB to MSB).
data x Bitmap data.

Description The GLK24064-25 is capable of storing up to sixty-four font and bitmap

files combined. In order to upload a bitmap to the GLK24064-25 you
must first initiate the upload font file command (0xFE 0x5E), you must
then pass it a reference identification number, which must be unique for
every font on the display module. You may then pass the display module
the two byte file size, which needs to be transfered LSB, then MSB. The
last part of uploading a bitmap is transmitting the bitmap file data.
For detailed instructions on uploading a file to the GLK24064-25 see
Section 11.1 on page 43.

Remembered Always

7.3 Drawing a Bitmap from Memory

Syntax

Parameters

Description This command will draw a bitmap that is located in the on board memory.

Remembered No

Hexadecimal 0xFE 0x62 [refID] [X] [Y]
Decimal 254 98 [refID] [X] [Y]
ASCII 254 “b” [refID] [X] [Y]

Parameter Length Description
refID 1 The bitmap identification number.
X 1 Left bounds.
Y 1 Top bounds.

The bitmap is referenced by the bitmaps reference identification number,
which is established when the bitmap is uploaded to the display module.
The bitmap will be drawn beginning at the top left, from the specified
X,Y coordinates. A directory listing of the contents of the entire filesys­tem may be obtained by using the “Get Filesystem Directory” command,
see Section 11.5 on page 46 for more detailed information.

7.4 Drawing a Bitmap Directly

Syntax

Matrix Orbital GLK24064-25 27

Hexadecimal 0xFE 0x64 [X] [Y] [W] [H] [D]
Decimal 254 100 [X] [Y] [W] [H] [D]
ASCII 254 “d” [X] [Y] [W] [H] [D]

Parameters

Description Drawing a bitmap to the GLK24064-25, without first uploading the im-

Remembered No

Parameter Length Description
X 1 Left bounds.
Y 1 Top bounds.
W 1 Width
H 1 Height
D 1 Data

age to the memory can be a very useful feature for drawing images that
are not used very often. In order to accomplish this, you must supply the
display module with the X,Y coordinates, representing the top left corner
of where you would like to draw the bitmap on the screen, as well as the
width and the height of the bitmap. After you have supplied this data you
may then upload the bitmap data to the GLK24064-25. The bitmap data
is encoded into bytes horizontally and is transfered the same as if you
were uploading a file, see Section 11.1 on page 43 for more information
about transferring data to the display module.

NOTE Drawing a bitmap directly to the display supports flow control.

8 Bar Graphs and Drawing

8.1 Introduction

Supplementary to the ability of the GLK24064-25 to display bitmaps and fonts, the GLK24064-25 also
allows for a robust 2D drawing environment. With the ability to draw by pixel, line or rectangle, as well as
the ability to continue a line to form a polygon, we are certain that you will spend less time, developing and
creating better looking projects. With the addition of custom bar and strip graphs, you are sure to find the
right tools to make any graphical layout a success.

8.2 Set Drawing Color

Syntax

Matrix Orbital GLK24064-25 28

Hexadecimal 0xFE 0x63 [color]
Decimal 254 99 [color]
ASCII 254 “c” [color]

Parameters

Description This command sets the drawing color for subsequent graphic commands

Remembered No

Parameter Length Description
color 1 Drawing color (0: White, 1-255:

Black).

that do not have the drawing color passed as a parameter. The parameter
[color] is the value of the color where white is 0 and black is 1-255.

8.3 Draw Pixel

Syntax

Parameters

Description This command will draw a pixel at (x,y) using the current drawing color.

Remembered No

Hexadecimal 0xFE 0x70 [x] [y]
Decimal 254 112 [x] [y]
ASCII 254 “p” [x] [y]

Parameter Length Description
x 1 X screen location.
y 1 Y screen location.

The unit processes these requests fast enough to keep up with a steady
stream at 115 Kbps so flow control is not required.

8.4 Drawing a Line

Syntax

Parameters

Hexadecimal 0xFE 0x6C [x1] [y1] [x2] [y2]
Decimal 254 108 [x1] [y1] [x2] [y2]
ASCII 254 “l” [x1] [y1] [x2] [y2]

Parameter Length Description
x1 1 Left bounds.
y1 1 Top Bounds.
x2 1 Right Bounds.
y2 1 Bottom Bounds.

Matrix Orbital GLK24064-25 29

Description This command will draw a line from (x1,y1) to (x2,y2) using the current

drawing color. Lines may be drawn from any part of the display to any
other part. However, it may be important to note that the line may in­terpolate differently right to left, or left to right. This means that a line
drawn in white from right to left may not fully erase the same line drawn
in black from left to right.

Remembered No

8.5 Continue a Line

Syntax

Parameters

Description This command will draw a line with the current drawing color from the

Remembered No

Hexadecimal 0xFE 0x65 [x] [y]
Decimal 254 101 [x] [y]
ASCII 254 “e” [x] [y]

Parameter Length Description
x 1 Left bounds.
y 1 Top Bounds.

last line end (x2,y2) to (x,y). This command uses the global drawing
color.

8.6 Draw a Rectangle

Syntax

Parameters

Hexadecimal 0xFE 0x72 [color] [x1] [y1] [x2] [y2]
Decimal 254 114 [color] [x1] [y1] [x2] [y2]
ASCII 254 “r” [color] [x1] [y1] [x2] [y2]

Parameter Length Description
color 1 Drawing color (0: White, 1-255:

Black).
x1 1 Left bounds.
y1 1 Top Bounds.
x2 1 Right Bounds.
y2 1 Bottom Bounds.

Matrix Orbital GLK24064-25 30

Description This command draws a rectangular box in the specified color (0: White,

1: Black). The top left corner is specified by (x1,y1) and the bottom right
corner by (x2,y2).

Remembered No

8.7 Drawing a Solid Rectangle

Syntax

Parameters

Description This command draws a solid rectangle in the specified color (0: White,

Remembered No

Hexadecimal 0xFE 0x78 [color] [x1] [y1] [x2] [y2]
Decimal 254 120 [color] [x1] [y1] [x2] [y2]
ASCII 254 “x” [color] [x1] [y1] [x2] [y2]

Parameter Length Description
color 1 Drawing color (0: White, 1-255:

Black).
x1 1 Left bounds.
y1 1 Top Bounds.
x2 1 Right Bounds.
y2 1 Bottom Bounds.

1: Black). The top left corner is specified by (x1,y1) and the bottom right
corner by (x2,y2). Since this command involves considerable processing
overhead, we strongly recommend the use of flow control, particularly if
the command is to be repeated frequently.

8.8 Initializing a Bar Graph

Syntax

Matrix Orbital GLK24064-25 31

Hexadecimal 0xFE 0x67 [refID] [type] [x1] [y1] [x2] [y2]
Decimal 254 103 [refID] [type] [x1] [y1] [x2] [y2]
ASCII 254 “g” [refID] [type] [x1] [y1] [x2] [y2]

Parameters

Description This command initializes a bar graph referred to by number [reference

Parameter Length Description
refID 1 Reference number
type 1 Type of bar graph.
x1 1 Left bounds.
y1 1 Top Bounds.
x2 1 Right Bounds.
y2 1 Bottom Bounds.

number] of type [type] with size from (x1,y1) (top left) to (x2,y2)
(bottom right). A maximum of 16 bar graphs with reference numbers
from 0 to 15 can be initialized as:

[type] Direction Bar Start Point

0 Vertical Bottom
1 Horizontal Left
2 Vertical Top
3 Horizontal Right

The bar graphs may be located anywhere on the display, but if
they overlap, they will not display properly.
It is important that [x1] is less than [x2], and [y1] is less than [y2]. This
command doesn’t actually draw the graph, it must be filled in using the
Fill Bar Graph command. The unit saves time by only drawing that part
of the bar graph which has changed from the last write, so the represen­tation on the screen may not survive a screen clear or other corrupting
action. A write of value zero, followed by new values will restore the
proper look of the bar graph.

Remembered No

8.9 Drawing a Bar Graph

Syntax

Parameters

Matrix Orbital GLK24064-25 32

Hexadecimal 0xFE 0x69 [ref] [value]
Decimal 254 105 [ref] [value]
ASCII 254 “i” [ref] [value]

Parameter Length Description
ref 1 Initialized bar graph reference

number.
value 1 The number of pixels to fill.

Description Once the bar graph has been initialized it can be filled in using this com-

mand. This command sets the bar graph specified by the [ref] number
to fill in [value]. [value] is given in pixels and should not exceed the
available height/width of the graph. (If it does the graph will simply be
written to its maximum size.)

Remembered No

8.10 Initializing a Strip Chart

Syntax

Parameters

Hexadecimal 0xFE 0x6A [refID] [x1] [y1] [x2] [y2]
Decimal 254 106 [refID] [x1] [y1] [x2] [y2]
ASCII 254 “j” [refID] [x1] [y1] [x2] [y2]

Parameter Length Description
refID 1 Reference number
x1 1 Left bounds.
y1 1 Top Bounds.
x2 1 Right Bounds.
y2 1 Bottom Bounds.

Matrix Orbital GLK24064-25 33

Description A strip chart is an area of the screen reserved for horizontal scrolling.

This is normally used as follows:

• Initialize the strip chart, which reserves the appropriate area of the

screen.

• Draw a line segment at the right or left side of the strip chart.

• Shift the strip chart to the right or left.

• Draw the next line segment.

• Used this way the strip chart can produce a graph which scrolls

smoothly horizontally in either direction. With text the strip chart
can produce a marquis effect.

NOTE If the strip chart is used with text we recommend the use of a 6 or 7 pixel wide
fixed width character set, with each character placed 8 pixels from the start of the previous
one.

Up to 7 strip charts ([ref] = 0 - 6) may be defined. To initialize a strip
chart the user must define an area on the display in which to place the
strip chart.(x1,y1) is the top left corner of the area to be used, where [x1]
is the placement of the column where the strip chart is to begin and [y1]
is the row. The user must then define [x2] as the bottom right column of
the area to be utilized and [y2] as the bottom right row.
The definition of x must lie on byte boundaries. That is, x must be defined
as 0x00, 0x08, 0x10, etc. This restriction does not apply to y values.

Remembered No

8.11 Shifting a Strip Chart

Syntax

Parameters

Matrix Orbital GLK24064-25 34

Hexadecimal 0xFE 0x6B [ref]
Decimal 254 107 [ref]
ASCII 254 “k” [ref]

Parameter Length Description
ref 1 Reference number of a strip chart

that has already been created.

Description This command shifts the strip chart left or right. [ref] determines both

which strip chart is used and which direction it will shift. The direction
is selected by the most significant bit (MSB):

• MSB: 0 shifts left

• MSB: 1 shifts right

For example if [ref] is 1:

• 254 107 1 (hex FE 6B 01) shifts left

• 254 107 129 (hex FE 6B 81) shifts right

This command shifts the contents of the area defined in the Initialize
Strip Chart command 8 pixels at a time.

Remembered No

9 Keypad

9.1 Introduction

The GLK24064-25 supports up to a twenty-five key, matrix style, keypad and may be configured to
allow key presses to be automatically transmitted via RS-232 or polled through I2C. The GLK24064-25 also
allows for auto-repeating key presses, and remapping of all keypad character codes.

9.2 Auto Transmit Key Presses On

Syntax

Description In this mode, all key presses are sent immediately to the host system

Remembered Yes

Factory Default On

Matrix Orbital GLK24064-25 35

Hexadecimal 0xFE 0x41
Decimal 254 65
ASCII 254 “A”

without the use of the poll keypad command. This is the default mode
on power up.

9.3 Auto Transmit Key Presses Off

Syntax

Description In this mode, up to 10 key presses are buffered until the unit is polled

Remembered Yes

Hexadecimal 0xFE 0x4F
Decimal 254 79
ASCII 254 “O”

by the host system, via the poll keypad command 254 38. Issuing this
command places the unit in polled mode.

9.4 Poll Key Press

Syntax

Description This command returns any buffered key presses via the RS-232 inter-

Hexadecimal 0xFE 0x26
Decimal 254 38
ASCII 254 “&”

face. The host system must be set up to receive key codes. When the
display receives this command, it will immediately return any buffered
key presses which may have not been read already. If there is more than
one key press buffered, then the high order bit (MSB) of the returned key
code will be set (1). If this is the only buffered key press, then the MSB
will be cleared (0). If there are no buffered key presses, then the returned
code will be 0x00. Please note that to make use of this command, the
“Auto Transmit Key Presses” mode should be off.

Remembered No

9.5 Clear Key Buffer

Syntax

Matrix Orbital GLK24064-25 36

Hexadecimal 0xFE 0x45
Decimal 254 69
ASCII 254 “E”

Description This command clears any unread key presses. In a menu application, if

the user presses a key which changes the menu context, any following
key presses may be inaccurate and can be cleared out of the buffer be­tween menu changes to prevent jumping around the menu tree. It may
also be used, in effect, to reset the keypad in case the host application
resets for whatever reason.

Remembered No

9.6 Set Debounce Time

Syntax

Parameters

Description This command sets the time between key press and key read. All key

Remembered Yes

Factory Default 8

Hexadecimal 0xFE 0x55 [time]
Decimal 254 85 [time]
ASCII 254 “U” [time]

Parameter Length Description
time 1 Debounce time in increments of

6.554ms (0 - 255).

types with the exception of latched piezo switches will ’bounce’ for a
varying time, depending on their physical characteristics. The [time]
value is in increments of 6.554ms. The default debounce time for the
module is 8 (about 52ms), which is adequate for most membrane key­pads.

9.7 Set Auto Repeat Mode

Syntax

Matrix Orbital GLK24064-25 37

Hexadecimal 0xFE 0x7E [mode]
Decimal 254 126 [mode]
ASCII 254 “~” [mode]

Parameters

Description Two auto repeat modes are available and are set via the same command:

Parameter Length Description
mode 1 Auto Repeat Mode (0: Resend Key

, 1: Key Up/Down)

• Resend Key Mode: 0x00

• Key Up/Down Mode: 0x01

Resend Key Mode This mode is similar to the action of a keyboard on

a PC. In this mode, when a key is held down, the key code is
transmitted immediately followed by a 1/2 second delay. After
this delay, key codes will be sent via the RS-232 interface at a rate
of about 5 codes per second. This mode has no effect if polling or
if using the I2C interface.

Key Up/Down Mode This mode may be used when the typematic pa-

rameters of the “Resend Key Code” mode are unacceptable or if
the unit is being operated in polled mode. The host system detects
the press of a key and simulates an auto repeat inside the host sys­tem until the key release is detected. In this mode, when a key is
held down, the key code is transmitted immediately and no other
codes will be sent until the key is released. On the release of the
key, the key release code transmitted will be a value equal to the
key down code plus 20 hex.

Remembered Yes

Examples When the key code associated with key ’P’ (0x50) is pressed, the release

code is ’p’ (0x70). In RS-232 polled mode or via the I2C, the “Key
Down / Key Up” codes are used; however, the user should be careful of
timing details. If the poll rate is slower than the simulated auto-repeat it
is possible that polling for a key up code will be delayed long enough
for an unwanted key repeat to be generated.

9.8 Auto Repeat Mode Off

Syntax

Description This command turns auto repeat mode off. See Set Auto Repeat Mode.

Matrix Orbital GLK24064-25 38

Hexadecimal 0xFE 0x60
Decimal 254 96
ASCII 254 “‘”

Remembered No

9.9 Assign Keypad Codes

Syntax

Parameters

Description This command will allow you to reassign the key codes that correspond

Remembered Always

Hexadecimal 0xFE 0xD5 [KDown] [KUp]
Decimal 254 213 [KDown] [KUp]

Parameter Length Description
KDown 25 Key down codes
KUp 25 Key up codes

to the key presses on the matrix style key pad. The first twenty-five bytes
that are transmitted will be used for the key down codes and the next
twenty-five bytes that are transmitted will be used for the key up codes.
The default values of the key down codes are ’A-Y’ in order, and for the
key up codes the values are ’a-y’ in order.

Key Down

1 2 3 4 5

1 A B C D E
2 F G H I J
3 K L M N O
4 P Q R S T
5 U V W X Y

1 a b c d e
2 f g h i j
3 k l m n o
4 p q r s t
5 u v w x y

Key Up

1 2 3 4 5

10 Display Functions

10.1 Introduction

The GLK24064-25 employs software controlled display settings, which allow for control over, clearing
the screen, changing the brightness and contrast or setting timers for turning it on or off. The combination
of these allow you complete software control over your display’s appearance.

Matrix Orbital GLK24064-25 39

10.2 Clear Screen

Syntax

Description This command clears the display and resets the text insertion position to

Remembered No

Hexadecimal 0xFE 0x58
Decimal 254 88
ASCII 254 “X”

the top left position of the screen defined in the font metrics.

10.3 Backlight On

Syntax

Parameters

Hexadecimal 0xFE 0x42 [min]
Decimal 254 66 [min]
ASCII 254 “B” [min]

Parameter Length Description
min 1 Minutes before turning the

backlight on (0 to 90).

Description This command turns the backlight on after the [minutes] timer has ex-

pired , with a ninety minute maximum timer. A time of 0 specifies that
the display should turn on immediately and stay on. When this command
is sent while the remember function is on, the timer will reset and begin
after power up.

Remembered Yes

Factory Default 0

Matrix Orbital GLK24064-25 40

10.4 Backlight Off

Syntax

Description This command turns the backlight off immediately. The backlight will

Remembered Yes

Hexadecimal 0xFE 0x46
Decimal 254 70
ASCII 254 “F”

remain off until a ’Backlight On’ command has been received.

10.5 Set Backlight Brightness

Syntax

Parameters

Description This command sets the backlight settings according to [backlight]. If the

Hexadecimal 0xFE 0x99 [brightness]
Decimal 254 153 [brightness]

Parameter Length Description
brightness 1 Backlight setting (0 to 255).

remember function is on, this command acts the same as ’Set and Save
Backlight Brightness’.

Remembered Yes

Factory Default 255

10.6 Set and Save Backlight Brightness

Syntax

Parameters

Matrix Orbital GLK24064-25 41

Hexadecimal 0xFE 0x98 [brightness]
Decimal 254 152 [brightness]

Parameter Length Description
brightness 1 Backlight setting (0 to 255).

Description This command sets and saves the backlight [brightness] as default.

Remembered Always

10.7 Set Contrast

Syntax

Parameters

Description This command sets the display’s contrast to [contrast], where [contrast] is

Remembered Yes

Factory Default 128

Hexadecimal 0xFE 0x50 [contrast]
Decimal 254 80 [contrast]
ASCII 254 “P” [contrast]

Parameter Length Description
contrast 1 Contrast value (0 to 255).

a value between 0x00 and 0xFF (between 0 to 255). Lower values cause
‘on’ elements in the display area to appear lighter, while higher values
cause ‘on’ elements to appear darker. Lighting and temperature condi­tions will affect the actual value used for optimal viewing. Individual
display modules will also differ slightly from each other in appearance.
In addition, values for optimal viewing while the display backlight is on
may differ from values used when backlight is off.
This command does not save the [contrast] value, and is lost after power
down; but this command has the option of remembering the settings
when issued with the Remember function ‘on’ . When this is the case,
this command is the same as the Set and Save Contrast command.

10.8 Set and Save Contrast

Syntax

Parameters

Matrix Orbital GLK24064-25 42

Hexadecimal 0xFE 0x91 [contrast]
Decimal 254 145 [contrast]

Parameter Length Description
contrast 1 Contrast value (0 to 255).

Description This command sets the display’s contrast to [contrast], where [contrast] is

a value between 0x00 and 0xFF (between 0 to 255). Lower values cause
‘on’ elements in the display area to appear lighter, while higher values
cause ‘on’ elements to appear darker. Lighting conditions will affect the
actual value used for optimal viewing. Individual display modules will
also differ slightly from each other in appearance. In addition, values for
optimal viewing while the display backlight is on may differ from values
used when backlight is off.

NOTE This command saves the [contrast] value so that it is not lost after power down.

Remembered Yes

Factory Default 128

11 Filesystem

11.1 Introduction

11.1.1 File Upload Protocol

In order to allow fonts and bitmaps to be uploaded to the on board flash memory Matrix Orbital has
developed a simple protocol that supports RS-232/TTL or I2C communications. In order to upload a font
file you must first provide a reference identification number (ref ID), then the file size and finally the data.

The reference identification number will allow you to identify the font for future use. After transmitting
the refID, please wait for the display module to send an immediate confirmation that the reference ID has
not been used yet. The display module will do this in the form of echoing the byte back to you. Once you
receive the echo, you must then confirm it by sending a 0x01 byte.

The next part of uploading a font file is to provide the display module with a two byte file size of the
font file you are attempting to upload; the font size must be formated LSB to MSB. After the first byte is
transmitted you will receive an echo of the byte and you must confirm the echo with a confirmation byte
(0x01). However, after the display module receives the second byte it will echo the byte and then send a
0x01 confirmation byte if the file fits, if the file does not fit the module will notify you by sending 0x08 and
then it will terminate the upload session. If the font file does fit you must confirm the echo with a 0x01 byte.

Matrix Orbital GLK24064-25 43

The last part of uploading a font file is to upload the file data. After transmitting each byte of the file the
module will echo the byte and wait for a confirmation byte of 0x01 until the file has completed uploading.
Below is an example of uploading the font file which we created in Section 5.1.2 on page 19.

Host: Transmit(0xFE); //Command Prefix

Transmit(0x24); //Font file upload command
Transmit(0x03); //Request file ID for font file

Module: Echo(0x03); //Accept request for file ID, by echoing the request

Host: Receive(); //Receive the echo

Confirm(0x01); //Confirm File ID
Transmit(0x19); //Transmit the file size LSB

Module: Echo(0x19); //Echo the LSB

File Size = 0x19

Host: Receive(); //Receive LSB echo

Confirm(0x01); //Confirm the LSB
Transmit(0x00); //Transmit MSB

Module: Echo(0x00); //Echo MSB

FileFits(0x01); //Send confirmation that the file fits

Host: Receive(); //Receive confirmation

Transmit(0x05); //Begin transmit of file data

Module: Echo(0x05); //Echo first byte from file

Host: Receive(); //Receive echo

Confirm(0x01); //Confirm echo
Transmit(0x07); //Transmit second byte of file data

etc...

NOTES

• The GLK24064-25 has watch dog timer, set to 2.1 seconds in between transmissions,

in order prevent the display module from staying in a waiting state.

• Once the timeout has been reached the timer will reset the display and issue a 0xFE

0xD4 response to the host to signal that this has happened.

Matrix Orbital GLK24064-25 44

11.2 Wipe Filesystem

Syntax

Description This command completely erases the display’s non-volatile memory. It

Remembered Yes

Hexadecimal 0xFE 0x21 0x59 0x21
Decimal 254 33 89 33
ASCII 254 “!” “Y” “!”

removes all fonts, font metrics, bitmaps, and settings (current font, cursor
position, communication speed, etc.). It is an “odd” command in that it
is three bytes in length in order to prevent accidental execution.

11.3 Deleting a File

Syntax

Parameters

Description This command erases a single file at a time within the GLK24064-25

Hexadecimal 0xFE 0xAD [type] [refID]
Decimal 254 173 [type] [refID]

Parameter Length Description
type 1 Type of file (0:Font, 1:Bitmap)
refID 1 Reference ID of the file to delete.

memory when given two parameters: [type] and [ref]. The file type and
reference number are defined when the file is saved to the GLK24064-25.

• [type] = 1: Bitmap

• [type] = 0: Font

Remembered Yes

11.4 Get Filesystem Space

Syntax

Matrix Orbital GLK24064-25 45

Hexadecimal 0xFE 0xAF
Decimal 254 175

Description This command will return 4 bytes, LSB to MSB for how many bytes are

remaining in the 16 KB on board memory.

Remembered No

11.5 Get Filesystem Contents

Syntax

Description This command will return the contents of the file system directory.

Remembered No

Hexadecimal 0xFE 0xB3
Decimal 254 179

The first byte returned will be a hex value representing the number of
entries in the filesystem, followed by four bytes for each entry. See the
following tables:

Filesystem Header

Bytes Description

1 Hex value representing the number

of entries in the filesystem

File Entry

Bytes Description

1 Flag: Hex value of 0x00 indicates

that this file entry has not been used.

1 FileID/Type: 1st bit is the file type

(0: Font, 1: Bitmap). Next 7 bits are

the file ID.
1 File Size: LSB
1 File Size: MSB

11.6 Downloading a File

Syntax

Matrix Orbital GLK24064-25 46

Hexadecimal 0xFE 0xB2 [Type] [refID]
Decimal 254 178 [Type] [refID]

Parameters

Description Download a specified file from the filesystem. The first 4 bytes will be

Remembered No

Parameter Length Description
Type 1 File type (0:Font File, 1:Bitmap)
refID 1 Reference ID number

the length of the file (LSB to MSB) followed by the data contained in the
file.

11.7 Moving a File

Syntax

Parameters

Description This command can be used to move a file to a new file ID, or correct the

Remembered Always

Hexadecimal 0xFE 0xB4 [oldT] [oldID] [newT] [newID]
Decimal 254 180 [oldT] [oldID] [newT] [newID]

Parameter Length Description
oldT 1 Old file type
oldID 1 Old file ID
newT 1 New file type
newID 1 New file ID

type of a file that was uploaded incorrectly. The command first checks to
see if there is a file identified by [oldT] and [oldID]. If it does exist, and
there is no file already with the desired type and ID, the ID and type of
the old file will be changed to [newT] and [newID] respectively.

12 Data Security

12.1 Introduction

Ensuring that your GLK24064-25 display’s exactly what you want it to can be the difference between a
projects success and failure. This is why we incorporate features such as Data Lock into the GLK24064-25.
With this new feature you now are in control over of how and when settings will be changed so there is no
need to worry about the module acting exactly like you expected it to because all the settings may be locked
and remembered for the next power up.

Matrix Orbital GLK24064-25 47

12.2 Set Remember

Syntax

Parameters

Description This command allows you to switch the remember function on and off.

Remembered No

Hexadecimal 0xFE 0x93 [switch]
Decimal 254 147 [switch]

Parameter Length Description
switch 1 0: Do not remember, 1: Remember

To use the remember function, set remember to on, then set all of the
settings that you wish to save, settings that are listed as ’Remember:
Yes’ support being saved into the non-volatile memory. After you have
set all of the commands that you wish to save, you may then cycle the
power and check the display settings to ensure that all the settings have
been saved. If you wish to use remember again after cycling the power,
you must set it to on again.

NOTES

• Writing to non-volatile memory is time consuming and slows down the operation of

the display.

• Non-volatile memory has a ‘write limit’ and may only be changed approximately

100,000 times.

Factory Default Do not remember

12.3 Data Lock

Syntax

Parameters

Matrix Orbital GLK24064-25 48

Hexadecimal 0xFE 0xCA [level]
Decimal 254 202 [level]

Parameter Length Description
level 1 Sets the data lock level

Description Data lock, originally known as paranoia, allows you to lock the module

from displaying information, as well as enables the protection of the
filesystem and module settings. Each bit corresponds corresponds to a
different lock level, while sending a zero will unlock your display as the
following tables explains:

Bit Binary Data Lock Level Description
0 0 Unlock Sending a zero will cause

the display to unlock.

1-4 1-1111 Reserved
5 10000 Setting Lock Locks the display settings

such as backlight, contrast
and GPO settings.

6 100000 Filesystem Lock When locked no bitmap or

font files may be added,
deleted or modified.

7 1000000 Command Lock Locks all commands but

the the data lock command.

8 10000000

NOTES

• Sending a new data lock level will override the previous data lock level.

• Data lock levels may be combined.

Remembered Always

Factory Default 0

Examples

Hex Dec Binary Description

0x00 0 0 Unlock
0xF0 240 11110000 Setting, Filesystem, Command and Display Lock
0x50 80 01010000 Setting and Command Lock

Matrix Orbital GLK24064-25 49

12.4 Set and Save Data Lock

Syntax

Parameters

Description This command will set and save the data lock level. See the Data Lock

Remembered Always

Factory Default 0

Hexadecimal 0xFE 0xCB [level]
Decimal 254 203 [level]

Parameter Length Description
level 1 Sets the data lock level

section for more information.

13 Miscellaneous

13.1 Introduction

This chapter covers the ’Report Version Number’ and ’Read Module Type’ commands. These commands
can be particularly useful to find out more information about the display module before contacting technical
support.

13.2 Read Version Number

Syntax

Description This command will return a byte representing the version of the module,

Matrix Orbital GLK24064-25 50

Hexadecimal 0xFE 0x36
Decimal 254 54
ASCII 254 “6”

see the following table as an example:

Hex Value Version Number

0x10 Version 1.0
0x20 Version 2.0
0x42 Version 4.2

Remembered No

13.3 Read Module Type

Syntax

Description This command will return a hex value corresponding to the the model

Hexadecimal 0xFE 0x37
Decimal 254 55
ASCII 254 “7”

number of the module see the following table:

Hex Product ID Hex Product ID

1 LCD0821 36 LK202-24-USB
2 LCD2021 37 VK202-24-USB
5 LCD2041 38 LK204-24-USB
6 LCD4021 39 VK204-24-USB
7 LCD4041 3A PK162-12
8 LK202-25 3B VK162-12

9 LK204-25 3C MOS-AP-162A
A LK404-55 3D PK202-25
B VFD2021 3E MOS-AL-162A
C VFD2041 40 MOS-AV-202A
D VFD4021 41 MOS-AP-202A
E VK202-25 42 PK202-24-USB
F VK204-25 43 MOS-AL-082

10 GLC12232 44 MOS-AL-204
13 GLC24064 45 MOS-AV-204
15 GLK24064-25 46 MOS-AL-402
22 GLK12232-25-WBL 47 MOS-AV-402
24 GLK12232-25-SM 48 LK082-12
31 LK404-AT 49 VK402-12
32 MOS-AV-162A 4A VK404-55
33 LK402-12 4B LK402-25
34 LK162-12 4C VK402-25
35 LK204-25PC

Matrix Orbital GLK24064-25 51

Remembered No

14 Command Summary

14.1 Communications

Description
Turn Flow Control On

Turn Flow Control Off

Changing the I2C Slave
Address

Changing the Baud Rate

Setting a Non-Standard
Baud Rate

14.2 Fonts

Syntax
Hexadecimal 0xFE 0x3A [full] [empty]
Decimal 254 58 [full] [empty]
ASCII 254 “:” [full] [empty]

Hexadecimal 0xFE 0x3B
Decimal 254 59
ASCII 254 “;”

Hexadecimal 0xFE 0x33 [adr]
Decimal 254 51 [adr]
ASCII 254 “3” [adr]

Hexadecimal 0xFE 0x39 [speed]
Decimal 254 57 [speed]
ASCII 254 “9” [speed]

Hexadecimal 0xFE 0xA4 [speed]
Decimal 254 164 [speed]

Page

16

16

17

17

18

Description
Uploading a Font File

Setting the Current Font

Matrix Orbital GLK24064-25 52

Syntax
Hexadecimal 0xFE 0x24 [refID] [size] [data]
Decimal 254 36 [refID] [size] [data]
ASCII 254 “$” [refID] [size] [data]

Hexadecimal 0xFE 0x31 [refID]
Decimal 254 49 [refID]
ASCII 254 “1” [refID]

Page

21

22

Description
Font Metrics

Syntax
Hexadecimal 0xFE 0x32 [lm] [tm] [csp] [lsp] [srow]
Decimal 254 50 [lm] [tm] [csp] [lsp] [srow]
ASCII 254 “2” [lm] [tm] [csp] [lsp] [srow]

Page

22

Set Box Space Mode

14.3 Text

Description
Move Cursor Home

Setting the Cursor
Position

Setting the Cursor
Coordinate

Auto Scroll On

Hexadecimal 0xFE 0xAC [value]
Decimal 254 172 [value]

Syntax
Hexadecimal 0xFE 0x48
Decimal 254 72
ASCII 254 “H”

Hexadecimal 0xFE 0x47 [col] [row]
Decimal 254 71 [col] [row]
ASCII 254 “G” [col] [row]

Hexadecimal 0xFE 0x79 [col] [row]
Decimal 254 121 [col] [row]
ASCII 254 “y” [col] [row]

Hexadecimal 0xFE 0x51
Decimal 254 81
ASCII 254 “Q”

23

Page

24

24

25

25

Auto Scroll Off

Hexadecimal 0xFE 0x52
Decimal 254 82
ASCII 254 “R”

26

14.4 Bitmaps

Description
Uploading a Bitmap File

Matrix Orbital GLK24064-25 53

Syntax
Hexadecimal 0xFE 0x5E [refID] [size] [data]
Decimal 254 94 [refID] [size] [data]
ASCII 254 “^” [refID] [size] [data]

Page

26

Description
Drawing a Bitmap from
Memory

Syntax
Hexadecimal 0xFE 0x62 [refID] [X] [Y]
Decimal 254 98 [refID] [X] [Y]
ASCII 254 “b” [refID] [X] [Y]

Page

27

Drawing a Bitmap
Directly

Hexadecimal 0xFE 0x64 [X] [Y] [W] [H] [D]
Decimal 254 100 [X] [Y] [W] [H] [D]
ASCII 254 “d” [X] [Y] [W] [H] [D]

14.5 Bar Graphs and Drawing

Description
Set Drawing Color

Draw Pixel

Drawing a Line

Continue a Line

Syntax
Hexadecimal 0xFE 0x63 [color]
Decimal 254 99 [color]
ASCII 254 “c” [color]

Hexadecimal 0xFE 0x70 [x] [y]
Decimal 254 112 [x] [y]
ASCII 254 “p” [x] [y]

Hexadecimal 0xFE 0x6C [x1] [y1] [x2] [y2]
Decimal 254 108 [x1] [y1] [x2] [y2]
ASCII 254 “l” [x1] [y1] [x2] [y2]

Hexadecimal 0xFE 0x65 [x] [y]
Decimal 254 101 [x] [y]
ASCII 254 “e” [x] [y]

27

Page

28

29

29

30

Draw a Rectangle

Drawing a Solid
Rectangle

Initializing a Bar Graph

Drawing a Bar Graph

Matrix Orbital GLK24064-25 54

Hexadecimal 0xFE 0x72 [color] [x1] [y1] [x2] [y2]
Decimal 254 114 [color] [x1] [y1] [x2] [y2]
ASCII 254 “r” [color] [x1] [y1] [x2] [y2]

Hexadecimal 0xFE 0x78 [color] [x1] [y1] [x2] [y2]
Decimal 254 120 [color] [x1] [y1] [x2] [y2]
ASCII 254 “x” [color] [x1] [y1] [x2] [y2]

Hexadecimal 0xFE 0x67 [refID] [type] [x1] [y1] [x2] [y2]
Decimal 254 103 [refID] [type] [x1] [y1] [x2] [y2]
ASCII 254 “g” [refID] [type] [x1] [y1] [x2] [y2]

Hexadecimal 0xFE 0x69 [ref] [value]
Decimal 254 105 [ref] [value]
ASCII 254 “i” [ref] [value]

30

31

31

32

Description
Initializing a Strip Chart

Syntax
Hexadecimal 0xFE 0x6A [refID] [x1] [y1] [x2] [y2]
Decimal 254 106 [refID] [x1] [y1] [x2] [y2]
ASCII 254 “j” [refID] [x1] [y1] [x2] [y2]

Page

33

Shifting a Strip Chart

14.6 Keypad

Description
Auto Transmit Key
Presses On

Auto Transmit Key
Presses Off

Poll Key Press

Clear Key Buffer

Hexadecimal 0xFE 0x6B [ref]
Decimal 254 107 [ref]
ASCII 254 “k” [ref]

Syntax
Hexadecimal 0xFE 0x41
Decimal 254 65
ASCII 254 “A”

Hexadecimal 0xFE 0x4F
Decimal 254 79
ASCII 254 “O”

Hexadecimal 0xFE 0x26
Decimal 254 38
ASCII 254 “&”

Hexadecimal 0xFE 0x45
Decimal 254 69
ASCII 254 “E”

34

Page

35

36

36

36

Set Debounce Time

Set Auto Repeat Mode

Auto Repeat Mode Off

Assign Keypad Codes

Matrix Orbital GLK24064-25 55

Hexadecimal 0xFE 0x55 [time]
Decimal 254 85 [time]
ASCII 254 “U” [time]

Hexadecimal 0xFE 0x7E [mode]
Decimal 254 126 [mode]
ASCII 254 “~” [mode]

Hexadecimal 0xFE 0x60
Decimal 254 96
ASCII 254 “‘”

Hexadecimal 0xFE 0xD5 [KDown] [KUp]
Decimal 254 213 [KDown] [KUp]

37

37

38

39

14.7 Display Functions

Description
Clear Screen

Backlight On

Backlight Off

Set Backlight Brightness

Set and Save Backlight
Brightness

Set Contrast

Set and Save Contrast

Syntax
Hexadecimal 0xFE 0x58
Decimal 254 88
ASCII 254 “X”

Hexadecimal 0xFE 0x42 [min]
Decimal 254 66 [min]
ASCII 254 “B” [min]

Hexadecimal 0xFE 0x46
Decimal 254 70
ASCII 254 “F”

Hexadecimal 0xFE 0x99 [brightness]
Decimal 254 153 [brightness]

Hexadecimal 0xFE 0x98 [brightness]
Decimal 254 152 [brightness]

Hexadecimal 0xFE 0x50 [contrast]
Decimal 254 80 [contrast]
ASCII 254 “P” [contrast]

Hexadecimal 0xFE 0x91 [contrast]
Decimal 254 145 [contrast]

Page

40

40

41

41

41

42

42

14.8 Filesystem

Description
Wipe Filesystem

Deleting a File

Get Filesystem Space

Matrix Orbital GLK24064-25 56

Syntax
Hexadecimal 0xFE 0x21 0x59 0x21
Decimal 254 33 89 33
ASCII 254 “!” “Y” “!”

Hexadecimal 0xFE 0xAD [type] [refID]
Decimal 254 173 [type] [refID]

Hexadecimal 0xFE 0xAF
Decimal 254 175

Page

45

45

45

Description
Get Filesystem Contents

Syntax
Hexadecimal 0xFE 0xB3
Decimal 254 179

Page

46

Downloading a File

Moving a File

14.9 Data Security

Description
Set Remember

Data Lock

Set and Save Data Lock

14.10 Miscellaneous

Hexadecimal 0xFE 0xB2 [Type] [refID]
Decimal 254 178 [Type] [refID]

Hexadecimal 0xFE 0xB4 [oldT] [oldID] [newT] [newID]
Decimal 254 180 [oldT] [oldID] [newT] [newID]

Syntax
Hexadecimal 0xFE 0x93 [switch]
Decimal 254 147 [switch]

Hexadecimal 0xFE 0xCA [level]
Decimal 254 202 [level]

Hexadecimal 0xFE 0xCB [level]
Decimal 254 203 [level]

46

47

Page

48

48

50

Description
Read Version Number

Read Module Type

Syntax
Hexadecimal 0xFE 0x36
Decimal 254 54
ASCII 254 “6”

Hexadecimal 0xFE 0x37
Decimal 254 55
ASCII 254 “7”

Page

50

51

14.11 Command By Number

Matrix Orbital GLK24064-25 57

Command Description Page
Hex Dec ASCII

Command Description Page
Hex Dec ASCII
0x21 33 “!” Wipe Filesystem 45
0x24 36 “$” Uploading a Font File 21
0x26 38 “&” Poll Key Press 36
0x31 49 “1” Setting the Current Font 22
0x32 50 “2” Font Metrics 22
0x33 51 “3” Changing the I2C Slave Address 17
0x36 54 “6” Read Version Number 50
0x37 55 “7” Read Module Type 51
0x39 57 “9” Changing the Baud Rate 17
0x3A 58 “:” Turn Flow Control On 16
0x3B 59 “;” Turn Flow Control Off 16
0x41 65 “A” Auto Transmit Keypresses On 35
0x42 66 “B” Backlight On 40
0x45 69 “E” Clear Key Buffer 36
0x46 70 “F” Backlight Off 41
0x47 71 “G” Setting the Cursor Position 24
0x48 72 “H” Move Cursor Home 24
0x4F 79 “O” Auto Transmit Keypresses Off 36
0x50 80 “P” Set Contrast 42
0x51 81 “Q” Auto Scroll On 25
0x52 82 “R” Auto Scroll Off 26
0x55 85 “U” Set Debounce Time 37
0x58 88 “X” Clear Screen 40
0x5E 94 “^” Uploading a Bitmap File 26
0x60 96 “‘” Auto Repeat Mode Off 38
0x62 98 “b” Drawing a Bitmap from Memory 27
0x63 99 “c” Set Drawing Color 28
0x64 100 “d” Drawing a Bitmap Directly 27
0x65 101 “e” Continue a Line 30
0x67 103 “g” Initializing a Bar Graph 31
0x69 105 “i” Drawing a Bar Graph 32
0x6A 106 “j” Initializing a Strip Chart 33
0x6B 107 “k” Shifting a Strip Chart 34
0x6C 108 “l” Drawing a Line 29
0x70 112 “p” Draw Pixel 29
0x72 114 “r” Draw a Rectangle 30
0x78 120 “x” Drawing a Solid Rectangle 31
0x79 121 “y” Setting the Cursor Coordinate 25
0x7E 126 “~” Set Auto Repeat Mode 37
0x91 145 Set and Save Contrast 42
0x93 147 Set Remember 48

Matrix Orbital GLK24064-25 58

Command Description Page
Hex Dec ASCII
0x98 152 Set and Save Backlight Brightness 41
0x99 153 Set Backlight Brightness 41
0xA4 164 Setting a Non-Standard Baud Rate 18
0xAC 172 Set Box Space Mode 23
0xAD 173 Deleting a File 45
0xAF 175 Get Filesystem Space 45
0xB2 178 Downloading a File 46
0xB3 179 Get Filesystem Contents 46
0xB4 180 Moving a File 47
0xCA 202 Data Lock 48

15 Appendix

15.1 Specifications

15.1.1 Environmental

Table 70: Environmental Specifications

Standard Temperature Extended Temperature

Operating Temperature 0◦C to +50◦C -20◦C to +70◦C

Storage Temperature -20◦C to +70◦C -30◦C to +80◦C

Operating Relative Humidity 90% max non-condensing

Vibration (Operating) 4.9 m/s2XYZ directions

Vibration (Non-Operating) 19.6 m/s2XYZ directions

Shock (Operating) 29.4 m/s2XYZ directions

Shock (Non-Operating) 490 m/s2XYZ directions

Matrix Orbital GLK24064-25 59

15.1.2 Electrical

Table 71: Electrical Specifications

Standard Wide Voltage (V) Wide Voltage with Efficient

Switching Power Supply
(VPT)

Supply Voltage +5Vdc ±0.25V +9V to +15V +9V to +35V

Backlight On 110 mA typical

Backlight Off Supply 40 mA

Power Conservation 35 mA

15.2 Optical Characteristics

Table 72: Optical Characteristics

Pixel Layout 240 x 64 pixels XxY

Number of Characters 320 (maximum 40 characters x 8

Lines with 5x7 font)

Display Area 127.16 x 33.88mm XxY

Dot Size 0.49 x 0.49mm (XxY)

Dot Pitch 0.53 x 0.53mm (XxY)

LED Backlight Life 100, 000 hours typical

Backlight Yellow/Green LED

Blue LED
White LED

Matrix Orbital GLK24064-25 60

15.3 Physical Layout

Figure 22: Physical Diagram

15.4 Definitions

E Extended Temperature (-20C to 70C)

VPT Wide Voltage with Efficient Switching Power Supply (+9 to +35Vdc)

V Wide Voltage (+9 to +15Vdc)

GW Grey Text / White Background

WB White Text / Blue Background

MSB Most Significant Byte

LSB Least Significant Byte

15.5 Contacting Matrix Orbital

Telephone

Sales and Support: 1(403)229-2737

Matrix Orbital GLK24064-25 61

On The Web

Sales: http://www.MatrixOrbital.com

Support: http://www.MatrixOrbital.ca

Forums: http://www.lcdforums.com

Matrix Orbital GLK24064-25 62