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is high. Next, the display must be addressed using a one byte hexadecimal value, the default to write to the
unit is 0x50, while read is 0x51. Then information can be sent to the unit; even when reading, a command
must first be sent to let the unit know what type of information it is required to return. After each bit is sent,
the display will issue an ACK or NACK as described above. Finally, when communication is complete, the
transaction is ended by toggling the data line from low to high while the clock line is high. An example of
the use of this algorithm to write a simple “HELLO” message can be seen in 3.
Table 3: I
2
C Transaction Algorithm
START Toggle SDA high to low
Address 0x50
Information 0x48 0x45 0x4C 0x4C 0x4F
STOP Toggle SDA low to high
4.1.3 Serial Communication
In addition to being able to communicate via I
2
C the GLK12232-25-SM communicates natively through
the RS-232 protocol at at a default baud rate of 19,200 bps and is capable of standard baud rates from 9600
to 115,200 bps. Furthermore the GLK12232-25-SM 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 -30V to +30V or at TTL levels of 0
to +5V by setting the Protocol Select Jumpers to TTL.
4.2 Turn Flow Control On
Syntax
Hexadecimal 0xFE 0x3A [full] [empty]
Decimal 254 58 [full] [empty]
ASCII 254 “:” [full] [empty]
Parameters
Parameter Length Description
full 1 Bytes remaining before issuing a
almost full message. (Full is 0)
empty 1 Bytes available before issuing a
almost empty message. (Empty is
128)
Matrix Orbital GLK12232-25-SM 15
- GLK12232-25-SM 1
- Technical Manual 1
- Revision: 2.1 1
- Contents 2
- 1 Getting Started 6
- 1.2 Accessories 7
- 1.3 Features 8
- 1.4 Connecting to a PC 9
- 1.5 Installing the Software 9
- 2 Hardware Information 11
- 2.2 Protocol Select Jumpers 13
- 2.5 Manual Override 15
- 2.6 Filesystem Lock Jumper 16
- 3 Troubleshooting 17
- 4 Communications 18
- C Communication Summary 19
- C Transaction Example 19
- 4.2 Turn Flow Control On 20
- 4.3 Turn Flow Control Off 21
- 4.4 Changing the I 21
- C Slave Address 21
- 4.5 Changing the Baud Rate 22
- CrystalSpeed 23
- 8×DesiredBaud 23
- 5.1.1 Font File Format 25
- 5.1.2 Creating a Font 25
- 5.2 Uploading a Font File 27
- 5.3 Setting the Current Font 27
- 5.4 Font Metrics 28
- 5.5 Set Box Space Mode 28
- 6.1 Introduction 29
- 6.2 Move Cursor Home 29
- 6.5 Auto Scroll On 30
- 7 Bitmaps 31
- 7.4 Drawing a Bitmap Directly 32
- 8 Bar Graphs and Drawing 33
- 8.3 Draw Pixel 34
- 8.4 Drawing a Line 34
- 8.5 Continue a Line 34
- 8.6 Draw a Rectangle 35
- 8.7 Drawing a Solid Rectangle 35
- 8.8 Initializing a Bar Graph 36
- 8.9 Drawing a Bar Graph 36
- 8.11 Shifting a Strip Chart 38
- 9 General Purpose Output 39
- 10 Keypad 40
- 10.1.1 I 41
- C Interface 41
- 10.1.2 RS232 Interface 41
- 10.4 Poll Key Press 42
- 10.5 Clear Key Buffer 42
- 10.6 Set Debounce Time 42
- 10.7 Set Auto Repeat Mode 43
- 10.8 Auto Repeat Mode Off 44
- 10.9 Assign Keypad Codes 44
- 11 Display Functions 45
- 11.5 Set Brightness 46
- 11.6 Set and Save Brightness 46
- 11.7 Set Contrast 46
- 11.8 Set and Save Contrast 47
- 12 Filesystem 48
- 12.2 Wipe Filesystem 50
- 12.3 Deleting a File 52
- 12.4 Get Filesystem Space 52
- 12.5 Get Filesystem Directory 53
- 12.6 Filesystem Upload 53
- 12.7 Downloading a File 53
- 13 Data Security 54
- 13.2 Set Remember 55
- 13.3 Data Lock 55
- 13.4 Set and Save Data Lock 57
- 13.5 Dump the Filesystem 57
- 13.6 Write Customer Data 57
- 13.7 Read Customer Data 57
- 14 Miscellaneous 58
- 15 Command Summary 60
- 15.4 Bitmaps 61
- 15.5 Bar Graphs and Drawing 61
- 15.6 General Purpose Output 62
- 15.7 Keypad 62
- 15.8 Display Functions 63
- 15.9 Filesystem 63
- 15.10 Data Security 64
- 15.11 Miscellaneous 64
- 15.12 Command By Number 65
- 16 Appendix 66
- 16.2 Optical Characteristics 67
- 16.3 Physical Layout 67
- Figure 19: Physical Diagram 68
- 16.4 Ordering Information() 69
- 16.5 Definitions 69
- 16.7 Revision History 70
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