Matrix-orbital GLT240128 Legacy Bedienungsanleitung Seite 26
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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 =
CrystalSpeed
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
Crystal Speed 16 Mhz
Desired BAUD 13,500
speed =
crystalspeed
8∗ DesiredBaud
− 1
speed = 148.15 − 1
speed =
16, 000, 000
8∗ 13, 500
− 1
speed = 147.15
• LSB = 0x93 (rounded)
• MSB = 0x00
• Intended Baud Rate: 13,500 baud Actual Baud Rate:
16,000,000
8(147+1)
=13,514 Percent Difference: 0.1%
NOTES
• Results from the formula are rounded down to the nearest whole number (i.e 73.07
= 73).
• This formula becomes less acurate as baud rates increase, due to rounding.
• Place the speed result backwards into the formula to receive the actual baud rate.
(Baud =
CrystalSpeed
8(speed+1)
)
• The actual baud rate must be within 3% of the intended baud rate for the device to
communicate.
Matrix Orbital GLT240128 21
- GLT240128 1
- Technical Manual 1
- Revision: 1.2 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 10
- 2 Hardware Information 11
- 2.1 Communication Connectors 13
- 2.4 Power Through DB-9 Jumper 16
- 2.6 Protocol Select Jumpers 17
- 2.7 Filesystem Lock Jumper 18
- 2.8 Manual Override 19
- 3 Troubleshooting 20
- 4 Communications 21
- C Transaction Example 22
- 4.2 Turn Flow Control On 23
- 4.3 Turn Flow Control Off 24
- 4.4 Changing the I 24
- C Slave Address 24
- 4.5 Changing the Baud Rate 25
- 5.1 Introduction 27
- 5.2 Uploading a Font File 29
- 5.3 Setting the Current Font 29
- 5.4 Font Metrics 30
- 5.5 Set Box Space Mode 31
- 6.1 Introduction 31
- 6.2 Move Cursor Home 31
- 6.5 Auto Scroll On 32
- 7 Bitmaps 33
- 8 Bar Graphs and Drawing 35
- 8.3 Draw Pixel 36
- 8.4 Drawing a Line 36
- 8.5 Continue a Line 37
- 8.6 Draw a Rectangle 37
- 8.7 Drawing a Solid Rectangle 37
- 8.8 Initializing a Bar Graph 38
- 8.9 Drawing a Bar Graph 39
- 8.11 Shifting a Strip Chart 40
- 9 Touchpad 41
- 9.2 Set Touch Region 42
- 9.3 Delete Touch Region 42
- 9.4 Delete All Touch Regions 42
- 9.5 Set Touch Mode 43
- 9.6 Set Region Reporting Mode 43
- 9.7 Set Dragging Threshold 44
- 9.8 Set Pressure Threshold 44
- 9.9 Run Touchpad Calibration 44
- 10 Display Functions 45
- 10.4 Display Off 46
- 10.5 Set Brightness 46
- 10.6 Set and Save Brightness 46
- 10.7 Set Contrast 47
- 10.8 Set and Save Contrast 47
- 11 Filesystem 48
- 11.2 Wipe Filesystem 50
- 11.3 Deleting a File 51
- 11.4 Get Filesystem Space 51
- 11.5 Get Filesystem Directory 53
- 11.6 Filesystem Upload 53
- 11.7 Downloading a File 53
- 12 Data Security 54
- 12.2 Set Remember 55
- 12.3 Data Lock 55
- 12.4 Set and Save Data Lock 57
- 12.5 Dump the Filesystem 57
- 12.6 Write Customer Data 57
- 12.7 Read Customer Data 57
- 13 Miscellaneous 58
- 14 Command Summary 60
- 14.4 Bitmaps 61
- 14.5 Bar Graphs and Drawing 61
- 14.6 Touchpad 62
- 14.7 Display Functions 62
- 14.8 Filesystem 63
- 14.9 Data Security 63
- 14.10 Miscellaneous 64
- 14.11 Command By Number 64
- 15 Appendix 66
- 15.3 Physical Layout 67
- Figure 24: Physical Diagram 68
- Matrix Orbital GLT240128 63 68
- 15.4 Ordering Information 69
- 15.5 Definitions 69
- 15.7 Revision History 70
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