Matrix Orbital GLK19264A-7T-1U User manual

GLK19264A-7T-1U
Including the GLK19264A-7T-1U-USB, and GLK19264A-7T-1U-422
Technical Manual
Revision 2.5
PCB Revision: 2.0 or Higher
Firmware Revision: 8.4 or Higher

Revision History
Revision
Date
Description
Author
2.5
October 27, 2015
Correction to Hardware Lock
Divino
2.4
October 19, 2015
Revision to Commands for Firmware Revision 8.6
Clark
2.3
May 21, 2014
Revision to Commands for Firmware Revision 8.5
Martino
2.2
March 5, 2014
Correction to Current Draw of Backlights
Martino
2.1
September 9, 2013
Corrected Scripted Key and Keypad Brightness Commands
Clark
2.0
July 10, 2013
Initial Release
Clark
0.3
December 13, 2012
Added Firmware Revision 8.4 Commands
Clark
0.2
October 18, 2012
Preliminary Manual Release to Thomson Networks
Clark
0.1
May 7, 2012
Initial Manual Draft for PCB Revision 2.0
Clark

Contents
1 Introduction ............................................................................................................................................... 1
2 Quick Connect Guide..................................................................................................................................2
2.1 Available Headers ............................................................................................................................... 2
2.2 Standard Module ................................................................................................................................ 3
Recommended Parts............................................................................................................................. 3
Serial Connections................................................................................................................................. 3
I2C Connections .....................................................................................................................................4
2.3 USB Module ........................................................................................................................................ 5
Recommended Parts............................................................................................................................. 5
USB Connections................................................................................................................................... 5
2.4 RS422 Module..................................................................................................................................... 6
RS422 Connections ............................................................................................................................... 6
3 Software..................................................................................................................................................... 7
3.1 MOGD# ............................................................................................................................................... 7
3.2 Firmware Upgrade .............................................................................................................................. 8
3.3 Application Notes................................................................................................................................ 8
4 Hardware.................................................................................................................................................... 9
4.1 Standard Model .................................................................................................................................. 9
Extended Communication/Power Header ............................................................................................ 9
Serial DB9 Connector ............................................................................................................................ 9
Power Through DB9 Jumper ...............................................................................................................10
Protocol Select Jumpers...................................................................................................................... 10
Hardware Lock .................................................................................................................................... 10
4.2 USB Model.........................................................................................................................................11
Mini USB Connector............................................................................................................................11
Alternate USB Header .........................................................................................................................11
Alternate Power Connector ................................................................................................................11
4.3 RS422 Model .....................................................................................................................................12
RS422 Header...................................................................................................................................... 12
Alternate Power Connector ................................................................................................................12

4.4 Common Features............................................................................................................................. 13
General Purpose Outputs ................................................................................................................... 13
Dallas One-Wire Connector ................................................................................................................13
5 Troubleshooting.......................................................................................................................................14
5.1 Power ................................................................................................................................................14
5.2 Display...............................................................................................................................................14
5.3 Communication.................................................................................................................................15
5.4 Manual Override ...............................................................................................................................15
6 Commands ...............................................................................................................................................16
6.1 Communication.................................................................................................................................16
6.2 Text....................................................................................................................................................18
6.3 Drawing.............................................................................................................................................21
6.4 Fonts..................................................................................................................................................26
Font File Creation................................................................................................................................27
6.5 Bitmaps .............................................................................................................................................28
Bitmap File Creation............................................................................................................................29
Bitmap Masking ..................................................................................................................................30
6.6 9-Slices ..............................................................................................................................................30
9-Slice File Creation............................................................................................................................. 31
6.7 Animations ........................................................................................................................................32
Animation File Creation ......................................................................................................................33
6.8 General Purpose Output ................................................................................................................... 33
LED Indicators .....................................................................................................................................34
6.9 Dallas One-Wire ................................................................................................................................34
6.10 Piezo Buzzer ....................................................................................................................................35
6.11 Keypad.............................................................................................................................................36
6.12 Display Functions ............................................................................................................................38
6.13 Scripting .......................................................................................................................................... 40
6.14 Filesystem .......................................................................................................................................40
File Transfer Protocol..........................................................................................................................43
XModem Transfer Protocol................................................................................................................. 44
6.15 Data Security...................................................................................................................................46

6.16 Miscellaneous .................................................................................................................................47
7 Appendix ..................................................................................................................................................49
7.1 Command Summary .........................................................................................................................49
7.2 Block Diagram ...................................................................................................................................54
7.3 Environmental Specifications............................................................................................................54
7.4 Electrical Tolerances .........................................................................................................................54
7.5 Dimensional Drawings ...................................................................................................................... 55
7.1 Optical Characteristics ......................................................................................................................57
8 Ordering ...................................................................................................................................................57
8.1 Part Numbering Scheme ...................................................................................................................57
8.2 Options..............................................................................................................................................57
8.3 Accessories........................................................................................................................................ 58
9 Definitions................................................................................................................................................60
10 Contact...................................................................................................................................................60

Command Summary 1
1Introduction
Figure 1: GLK19264A-7T-1U Display
The GLK19264A-7T-1U is an intelligent graphic liquid crystal display engineered to quickly and easily add
an elegant creativity to any application. In addition to the RS232, TTL and I2C protocols available in the
standard model, USB and RS422 communication models allow the GLK19264A-7T-1U to be connected to
a wide variety of host controllers. Communication speeds of up to 115.2kbps for serial protocols and
100kbps for I2C ensure lightning fast text and graphic display.
The simple command structure permits easy software control of many settings including backlight
brightness, screen contrast, and baud rate. On board memory provides a whopping 256KB of
customizable fonts and bitmaps to enhance the graphical user experience.
User input on the GLK19264A-7T-1U is available through a built-in seven key tactile keypad. Three bi-
colour LEDs provide visual outputs and six general purpose outputs provide simple switchable five volt
sources on each model. In addition, an optional Dallas One-Wire header provides a communication
interface for up to thirty-two devices.
The versatile GLK19264A-7T-1U, with all the features mentioned above, is available in a variety of
colour, voltage, and temperature options to suit almost any application.

2 Command Summary
2Quick Connect Guide
2.1 Available Headers
Figure 2: GLK19264A-7T-1U Standard Module Header Locations
Figure 3: GLK19264A-7T-1U USB and RS422 Model Header Locations
Table 1: List of Available Headers
#
Header
Mate
Population
1
Mini USB Connector
EXTMUSB3FT/INTMUSB3FT
USB Model Only
2
RS422 Terminal Block
16-30 AWG Wire
422 Model Only
3
Alternate Power Connector
PCS
422 and USB Models Only
4
GPO Header
None Offered
All Models
5
Optional Dallas One-Wire Header
Temperature Probe
USB Model Only
6
DB9 Serial Header
CSS1FT/CSS4FT
Standard Model Only
7
Extended Communication/Power Connector
ESCCPC5V/BBC
Standard Model Only

Command Summary 3
2.2 Standard Module
The standard version of the GLK19264A-7T-1U allows for user configuration of two common
communication protocols. First, the unit can communicate using serial protocol at either RS323 or TTL
voltage levels. Second, it can communicate using the Inter-Integrated Circuit connect, or I2C protocol.
Connections for each protocol can be accessed through the four pin Communication/Power Header as
outlined in the Serial Connections and I2C Connections sections below.
Recommended Parts
Figure 4: Extended Communication/Power
Cable (ESCCPC5V)
The most common cable choice for any standard Matrix Orbital
display, the Extended Communication/ Power Cable offers a simple
connection to the unit with familiar interfaces. DB9 and floppy power
headers provide all necessary input to drive your display.
Figure 5: Breadboard Cable (BBC)
For a more flexible interface to the GLK19264A-7T-1U, a Breadboard
Cable may be used. This provides a simple four wire connection that
is popular among developers for its ease of use in a breadboard
environment.
Serial Connections
Serial protocol provides a classic connection to the GLK19264A-7T-1U.The Extended
Communication/Power Cable is most commonly used for this set up as it provides connections for DB9
serial and floppy power cables. To place your board in Serial mode, adhere to the steps laid out below.
1. Set the Protocol Select jumpers.
RS232: Connect the five jumpers*in the 232 protocol box with the zero ohm jumper resistors
provided or an alternate wire or solder solution.
TTL: Connect the four jumpers*in the TTL protocol box.
*Note: Jumpers must be removed from all protocol boxes save for the one in use.

4 Command Summary
2. Make the connections.
a. Connect the six pin female header of the Extended Communication/Power Cable to the
Communication/Power Header of your GLK19264A-7T-1U.
b. Insert the male end of your serial cable to the corresponding DB9 header of the Extended
Communication/Power Cable and the mate the female connector with the desired
communication port of your computer.
c. Select an unmodified floppy cable from a PC power supply and connect it to the power header
of the Communication/Power Cable.
3. Create.
MOGD# or a terminal program will serve to get you started, and then you can move on with
your own development. Instructions for the former can be found below and a variety of
application notes are available for the latter at www.matrixorbital.ca/appnotes.
I2C Connections
A more advanced connection to the GLK19264A-7T-1U is provided by the I2C protocol setting. This is
best accomplished using a breadboard and the Breadboard Cable. Power must be supplied from your
breadboard or another external source. To dive right into your application and use the GLK19264A-7T-
1U in I2C mode, get started with the guidelines below.
1. Set the Protocol Select switches.
I2C: Ensure that the two I2C jumpers in the corresponding protocol box are connected while all
others are open.
2. Make the connections.
a. Connect the Breadboard Cable to the Communication/Power Header on your GLK19264A-7T-
1U and plug the four leads into your breadboard. The red lead will require power, while the
black should be connected to ground, and the green and yellow should be connected to your
controller clock and data lines respectively.
b. Pull up the clock and data lines to five volts using a resistance between one and ten kilohms on
your breadboard.
3. Create.
This time you're on your own. While there are many examples within the Matrix Orbital
AppNote section, www.matrixorbital.ca/appnotes, too many controllers and languages exist to
cover them all. If you get stuck in development, it is possible to switch over to another protocol
on the standard board, and fellow developers are always on our forums for additional support.

Command Summary 5
2.3 USB Module
The GLK19264A-7T-1U-USB offers a single USB protocol for easy connection to a host computer. The
simple and widely available protocol can be accessed using the on board mini B style USB connector as
outlined in the USB Connections section.
Recommended Parts
Figure 6: Mini USB Cable
(EXTMUSB3FT)
The External Mini USB cable is recommended for the GLK19264A-7T-1U-USB
display. It will connect to the miniB style header on the unit and provide a
connection to a regular A style USB connector, commonly found on a PC.
USB Connections
The USB connection is the quickest, easiest solution for PC development. After driver installation, the
GLK19264A-7T-1U-USB will be accessible through a virtual serial port, providing the same result as a
serial setup without the cable hassle. To connect to your GLK19264A-7T-1U-USB please follow the steps
below.
1. Set the Protocol Select jumpers.
USB: The GLK19264A-7T-1U-USB offers USB protocol only. Model specific hardware prevents
this unit from operating in any other protocol, and does not allow other models to operate in
USB. Protocol Select jumpers on the USB model cannot be moved.
2. Make the connections.
Plug the mini-B header of your External Mini USB cable into your GLK19264A-7T-1U-USB and
the regular USB header into your computer USB jack.
3. Install the drivers.
a. Download the latest drivers at www.matrixorbital.ca/drivers, and save them to a known
location.
b. When prompted, install the USB bus controller driver automatically
c. If asked, continue anyway, even though the driver is not signed
d. When the driver install is complete, your display will turn on, but communication will not yet be
possible.
e. At the second driver prompt, install the serial port driver automatically
f. Again, if asked, continue anyway
4. Create.
Use MOGD# or a terminal program to get started, and then move on with your own
development. Instructions for the former can be found below and a number of application
notes are available for the latter at www.matrixorbital.ca/appnotes.

6 Command Summary
2.4 RS422 Module
The GLK19264A-7T-1U-422 provides an industrial alternative to the standard RS232 communication
protocol. Rather than single receive and transmit lines, the RS422 model uses a differential pair for the
receive and transmit signals to reduce degradation and increase transmission lengths. Power can be
transmitted at distance to a -VPT module or supplied from the immediate vicinity to a regular or –LV
unit. RS422 signals are available in a six pin connector as described in the RS422 Connections section.
RS422 Connections
The GLK19264A-7T-1U-422 provides a robust RS422 interface to the display line. For this interface, a
series of six wires are usually screwed into the RS422 terminal block provided. An alternate header is
also available to provide local power to a regular or –LV unit. To connect to your GLK19264A-7T-1U-422,
adhere to the steps laid out below.
1. Set the Protocol Select jumpers.
RS422: The GLK19264A-7T-1U-422 offers only RS422 protocol and does not require any jumper
changes.
2. Make the connections.
a. Screw one wire; sized 16 to 30 on the American Wire Gauge, into each of the six terminal block
positions. When local power is supplied, a floppy cable may link to the alternate power header.
b. Connect the Vcc wire to the positive terminal of your power supply and the GND terminal to
the negative or ground lead to provide appropriate power as per Voltage Specifications.
c. Secure the A and B wires to your non-inverting and inverting output signals respectively, while
attaching the Z and Y wires to your inverting and non-inverting inputs.
3. Create.
a. In a PC environment, MOGD# or a terminal program will serve to get you started. In addition, a
variety of application notes are available online in a number of different languages to aid in the
development of a host controller. Instructions for these programs can be found below and the
simple C# example at www.matrixorbital.ca/appnotes is a great first programming reference.

Command Summary 7
3Software
The multiple communication protocols available and simple command structure of the GLK19264A-7T-
1U means that a variety of applications can be used to communicate with the display. Text is sent to the
display as a character string, for example, sending the decimal value 41 will result in an 'A' appearing on
the screen. A single control character is also available. Commands are merely values prefixed with a
special command byte, 254 in decimal.
Table 2: Reserved Control Characters
Control Characters
7
Bell / Sound Buzzer
10
Line feed / New line
Once the correct communication port is identified, the following communication settings can be applied
to communicate correctly with the GLK19264A-7T-1U.
Table 3: Communication Settings
BPS
Data Bits
Parity
Stop Bits
Flow Control
19200
8
None
1
None
Finally, with a communication port identified and correctly setup simple text strings or even command
bytes can easily be transmitted to control your display.
3.1 MOGD#
The Matrix Orbital Graphic Display interface, MOGD#, is offered as a free download from
www.matrixorbital.ca/software/software_graphic. It provides a simple graphical interface that allows
settings, fonts, and bitmaps to be easily customised for any application.
While monochromatic bitmaps can easily be created in virtually any image editing program, MOGD#
provides an extensive font generation suite to stylize your display to any project design. In addition to
standard font wide modifications, character ranges can be specified by start and end values to eliminate
unused symbols, and individual glyphs can be modified with a double click. Finally, text spacing can be
tailored and a complete font library built with your Matrix Orbital graphic display.
Like uProject, MOGD# offers a scripting capability that provides the ability to stack, run, and save a
series of commands. The most basic function is the Send Numeric tool which is used to transmit a string
of values to the display to write text or execute a command.

8 Command Summary
Figure 7: MOGD# Command Example
Again, the clear screen command is sent to a connected display, this time using the MOGD# Send
Numeric function command style. Scripts can be run as a whole using the Play button from the toolbar
or as single commands by selecting Step; once executed it must be Reset. Before issuing commands, it is
a good idea to ensure communication with a display is successful using the autodetect button.
This program provides both a staging areas for your graphics display and a proving ground that will
prepare it for any application environment.
3.2 Firmware Upgrade
Beginning with revision 8.1, the firmware of the GLK19264A-7T-1U can be upgraded in the field. All
firmware revisions can be installed using software found at www.matrixorbital.ca/software/GLT Series.
If it is necessary to forgo all current and future upgrades to the filesystem and subsequent commands,
firmware revision 8.0 may be ordered as a part of a custom order. Please use the Contact section to
request more information from the Matrix Orbital sales team.
3.3 Application Notes
Full demonstration programs and code are available for Matrix Orbital displays in the C# language from
Simple C# AppNote Pack in the Application Note section at www.matrixorbital.ca/appnotes. Difficulty
increases from beginner, with the Hello World program, to advanced with the Dallas One-Wire
temperature reading application.
Many additional applications are available in a number of different programming languages. These
programs are meant to showcase the capability of the display and are not intended to be integrated into
a final design. For additional information regarding code, please read the On Code document also found
on the support site.

Command Summary 9
4Hardware
4.1 Standard Model
Extended Communication/Power Header
Figure 8: Extended Communication/Power Header
Table 4: Extended Communication/Power Pinout
Pin
Function
1
Vcc
2
Rx (SCL)
3
Tx (SDA)
4
Gnd
5
CTS
6
RTS
The Extended Communication/Power Header provides a standard connector for interfacing to the
GLK19264A-7T-1U.Voltage is applied through pins one and four of the four pin Communication/Power
Header. Please ensure the correct voltage input for your display by referencing Voltage Specifications
before connecting power. Pins two and three are reserved for serial transmission, using either the RS-
232/TTL or clocking data through the I²C protocol, depending on what has been selected by the Protocol
Select Jumpers. Pins five and six can be used for serial transmission hardware flow control, and are
ignored for I²C communications. The Molex 22-04-1061 style header used can be mated to a number of
connectors, a 22-01-1062 for example.
Serial DB9 Connector
Figure 9: Serial DB9 Connector
Table 5: Serial DB9 Pinout
Pin
Function
2
Tx
3
Rx
5
Gnd
7
CTS
8
RTS
9
NC/Vcc*
The GLK19264A-7T-1U provides a DB-9 Connector to readily interface with serial devices using EIA232
standard signal levels. 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. A standard male DB9 header will provide the perfect mate
for this connector.
*Note: Do not apply voltage through pin 9 of the DB-9 Connector AND through the Communication/Power Header
at the same time.

10 Command Summary
Power Through DB9 Jumper
In order to provide power through pin 9 of the DB-9 Connector you must connect the Power Through
DB-9 Jumper labelled D, as illustrated below. This connection can be made using a zero ohm resistor,
recommended size 0603, or a solder bridge. The GLK19264A-7T-1U allows all voltage models to use the
power through DB-9 option, see the Voltage Specifications for power requirements.
Figure 10: Power Through DB9 Jumper
Protocol Select Jumpers
The Protocol Select Jumpers provide the means necessary to toggle the GLK19264A-7T-1U between RS-
232, TTL and I²C protocols. As a default, the jumpers are set to RS-232 mode with solder jumps on the
RS232 jumpers. In order to place the display module in I²C mode you must first remove the solder jumps
from the RS232 jumpers and then place them on the I2C jumpers. The display will now be in I²C mode
and have a default slave address of 80, unless changed with the appropriate command. Similarly, in
order to change the display to TTL mode, simply remove the zero ohm resistors from the RS232 or I²C
jumpers and solder them to the TTL jumpers.
Hardware Lock
The Hardware Lock allows fonts, bitmaps, and settings to be saved, unaltered by any commands. By
connecting the two pads near the memory chip, designated R74, with a zero ohm resistor, the display
will be locked. This supersedes the data lock command and cannot be circumvented by any software
means. To unlock the display and make changes simply remove the jumper.

Command Summary 11
4.2 USB Model
Mini USB Connector
Figure 11: Mini USB Connector
Table 6: Mini USB Pinout
Pin
Function
1
Vcc
2
D-
3
D+
5
Gnd
The GLK19264A-7T-1U-USB comes with a familiar Mini USB Connector to fulfill both communication and
power needs. The standard Mini-B style header can be connected to any other USB style using the
appropriate cable. Most commonly used with a PC, this connection creates a virtual com port that
offers a simple power solution with a familiar communication scheme.
Alternate USB Header
Some advanced applications may prefer the straight four pin connection offered through the Optional
Alternate USB Header. This header offers power and communication access in a simple interface
package. The Optional Alternate USB Header may be added to the GLK19264A-7T-1U-USB for an added
charge as part of a custom order. Please use the Contact section to request more information from the
friendly Matrix Orbital sales team.
Alternate Power Connector
Figure 12: Alternate Power Connector
Table 7: Alternate Power Pinout
Pin
Function
1
Vcc
2
Gnd
3
Gnd
4
NC
The Alternate Power Connector provides the ability to power the GLK19264A-7T-1U-USB using a second
cable. The Tyco 171825-4 style header is particularly useful for connecting to an unmodified floppy
power cable, a 171822-4 for example, from a PC power supply for a simple bench power solution.

12 Command Summary
4.3 RS422 Model
RS422 Header
Figure 13: RS422 Header
Table 8: RS422 Pinout
Pin
Function
1
Gnd
2
Rx (Y)
3
Inv Rx (Z)
4
Inv Tx (B)
5
Tx (A)
6
Vcc
The six pin RS422 interface header of the GLK19264A-7T-1U-422 offers power and ground connections
as well as two differential pair communication lines. Regular and inverted lines are provided for both
receive and transmit signals. Power is supplied locally to the regular or –LV variants while the –VPT can
receive power over a distance. The Tyco 282834-6 style header is most suited to a simple wire
connection.
Alternate Power Connector
Figure 14: Alternate Power Connector
Table 9: Alternate Power Pinout
Pin
Function
1
Vcc
2
Gnd
3
Gnd
4
NC
The Alternate Power Connector provides the ability to power the GLK19264A-7T-1U-USB using a second
cable. The Tyco 171825-4 style header is particularly useful for connecting to an unmodified floppy
power cable, a 171822-4 for example, from a PC power supply for a simple bench power solution.

Command Summary 13
4.4 Common Features
General Purpose Outputs
Figure 15: GPO Header
Table 10: GPO Pinout
Pin
Function
Pin
Function
1
GPO 1
8
Gnd
2
GPO 2
9
Gnd
3
GPO 3
10
Gnd
4
GPO 4
11
Gnd
5
GPO 5
12
Gnd
6
GPO 6
13
Gnd
7
Vcc
14
Gnd
A unique feature of the GLK19264A-7T-1U is the ability to control relays*and other external devices
using either one or six General Purpose Outputs. Each can source up to 10mA of current at five volts
when on or sink 20mA at zero volts when off. The two row, fourteen pin header can be interfaced to a
number of female connectors to provide control to any peripheral devices required.
*Note: If connecting a relay, be sure that it is fully clamped using a diode and capacitor in order to absorb any
electro-motive force (EMF) which will be generated.
Dallas One-Wire Connector
Figure 16: Dallas One-Wire Connector
Table 11: Dallas One-Wire Pinout
Pin
Function
1
Vcc
2
D
3
Gnd
In addition to the six general purpose outputs the GLK19264A-7T-1U offers an Optional Dallas One-Wire
bridge, to allow for an additional thirty two one-wire devices to be connected to the display. This
header can be populated with a Tyco 173979 connector at an added cost by custom order only. Please
use the Contact section to request more information from the Matrix Orbital sales team.

14 Command Summary
5Troubleshooting
5.1 Power
In order for your Matrix Orbital display to function correctly, it must be supplied with the appropriate
power. If the power LED near the top right corner of the board is not illuminated, power is not applied
correctly. Try following the tips below.
First, 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.
If power is applied through the DB9 connector, ensure that the Power Through DB9 Jumper is
connected.
If changes have been made to the protocol select block, ensure all the appropriate protocol
select jumpers are connected and all unused protocol jumpers are disconnected.
The last step will be to check the interface connector in use on your display. If the power
connections have become loose, or you are unable to resolve the issue, please Contact Matrix
Orbital for more information.
5.2 Display
If your display is powered successfully, the Matrix Orbital logo, or user created screen should display on
start up. If this is not the case, check out these tips.
•Ensure the contrast is not too high or too low. This can result in a darkened or blank screen
respectively. See the Manual Override section to reset to default.
•Make sure that the start screen is not blank. It is possible to overwrite the Matrix Orbital logo
start screen, if this happens the screen may be blank. Try writing to the display to ensure it is
functional, after checking the contrast above.

Command Summary 15
5.3 Communication
When communication of either text or commands is interrupted, try the steps below.
•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/USB Port.
•Next, please ensure that the display module is set to communicate on the protocol that you are
using, by checking the Protocol Select Jumpers.
•In serial and USB protocols, ensure that the host system and display module are both
communicating on the same baud rate. The default rate for the display module is 19200 bps.
•Match Rx from your display to the transmitting pin from your host and the Tx pin to the
receiving pin.
•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 80.
•In I2C mode, connect Rx to the clock line of your controller and Tx to the data output.
•Unlock the display. See the Set and Save Data Lock command for more info.
•Finally, you may reset the display to its default settings using the Manual Override procedure
outlined below.
*Note: I²C communication will always require pull up resistors on SCL and SDA of one to ten kilohms.
5.4 Manual Override
Should the settings of your display become altered in a way that dramatically impacts usability, the
default settings can be temporarily restored. To override the display, please follow the steps below.
1. Disconnect power from your display.
2. Hold down the bottom left dot key.
3. Reconnect power to your unit, and wait for the start screen before releasing the key.
4. Settings will be temporarily** overridden to the defaults listed in the Manual Override Settings
table. At this point any important settings, such as contrast, backlight, or baud rate, should not only
be set but saved so they remain when the override is removed.
Parameter
Value
Backlight
255
Contrast
128
Baud Rate
19200
I2C Address
80
Table 12: Manual Override Settings
**Note: The display module will revert back to the old settings once turned off, unless desired settings are saved.