Matrix-orbital VK204-25 Legacy Manual de usuario Pagina 10
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1.3 Features
• 20 column by 4 line alphanumeric vacuum fluorescent display
• Selectable communication protocol, RS-232 or I
2
C
• Optional One-wire interface
• Six, 5V -20mA, general purpose outputs for a variety of applications
• Lightning fast communication speeds, up to 57.6 kbps for RS-232 and 400 kbps for I
2
C
• Default 19.2 kbps serial communication speed
• Extended temperature available for extreme environments of -20C to 70C
• Extended voltage and efficient power supply available
• Built in font with provision for up to 8 user defined characters
• Use of up to 127 modules on the same 2 wire I
2
C interface
• 1-wire bus that is capable of communicating with many devices over a single wire plus a ground
refernce
• Fully buffered so that no delays in transmission are ever necessary
• Ability to add a customized splash / startup screen
• Software controlled brightness with configurable time-out setting up to 90 minutes and software con-
trolled speed
• Use of up to a 25 key keypad with a 10 key buffer
• Horizontal or vertical bar graphs
• Extended temperature option
• Fits Matrix Orbital’s mountings without any modifications
1.4 Connecting to a PC
The VK204-25 connects seamlessly to a PC and it is an excellent means of testing the functionality. To
connect your display to a PC, 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.
Matrix Orbital VK204-25 6
- VK204-25 1
- Technical Manual 1
- Revision: 2.2 1
- Contents 2
- 1 Getting Started 5
- 1.2 Accessories 6
- Figure 5: Breadboard Cable 7
- Figure 6: Serial Cable 4FT 7
- Matrix Orbital VK204-25 3 7
- Figure 8: Aluminum Mountings 8
- Matrix Orbital VK204-25 4 8
- Figure 9: Keypad Mountings 9
- Figure 10: 4X4 Keypad 9
- Matrix Orbital VK204-25 5 9
- 1.3 Features 10
- 1.4 Connecting to a PC 10
- 1.5 Installing the Software 11
- 2 Hardware Information 12
- 2.1 DB-9 Connector 13
- 2.2 Power/Data Connector 14
- 2.3 Protocol Select Jumpers 15
- 2.4 General Purpose Outputs 16
- 2.5 Dallas 1-Wire Bridge 17
- 2.6 Manual Override 17
- 3 Troubleshooting 19
- 4 Communications 20
- C Transaction Example 21
- 4.2 Changing the I 22
- C Slave Address 22
- 4.3 Changing the Baud Rate 22
- CrystalSpeed 23
- 8×DesiredBaud 23
- 5.2 Auto Scroll On 25
- 5.3 Auto Scroll Off 26
- 5.4 Clear Screen 26
- 5.6 Set Auto Line Wrap On 27
- 5.7 Set Auto Line Wrap Off 27
- 5.8 Set Cursor Position 27
- 5.9 Go Home 28
- 5.10 Move Cursor Back 28
- 5.11 Move Cursor Forward 28
- 6 Special Characters 29
- 6.3 Saving Custom Characters 30
- 6.4 Loading Custom Characters 31
- 6.6 Initialize Medium Number 32
- 6.7 Place Medium Numbers 32
- 6.8 Initialize Large Numbers 33
- 6.9 Place Large Number 33
- 7 General Purpose Output 35
- 7.3 General Purpose Output On 36
- 7.4 Set Startup GPO state 36
- 8 Dallas 1-Wire 37
- 8.3 Dallas 1-Wire Transaction 38
- 9 Keypad 39
- C Interface 40
- 9.1.2 RS232 Interface 40
- 9.4 Poll Key Press 41
- 9.5 Clear Key Buffer 41
- 9.6 Set Debounce Time 42
- 9.7 Set Auto Repeat Mode 42
- 9.8 Auto Repeat Mode Off 43
- 9.9 Assign Keypad Codes 43
- 10 Display Functions 44
- 10.3 Display Off 45
- 10.4 Set VFD Brightness 45
- 11 Data Security 46
- 11.3 Data Lock 47
- 11.4 Set and Save Data Lock 48
- 12 Miscellaneous 49
- 12.3 Read Module Type 50
- 13 Command Summary 52
- 13.3 Special Characters 53
- 13.4 General Purpose Output 54
- 13.5 Dallas 1-Wire 54
- 13.6 Keypad 54
- 13.7 Display Functions 55
- 13.8 Data Security 55
- 13.9 Miscellaneous 56
- 13.10 Command By Number 56
- 14 Appendix 58
- 14.2 Physical Layout 59
- 14.3 Optical Characteristics 60
- 14.4 Definitions 60
- 14.6 Revision History 60
- Revision 2.0 Initial Revision 61
- Table 69: Revision History 61
- Matrix Orbital VK204-25 57 61
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