Matrix-orbital LK204-25 Legacy Bedienungsanleitung Seite 41
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Description In this mode, up to 10 key presses are buffered until the unit is polled by
the host system, via the poll keypad command 254 38. Issuing this
command places the unit in polled mode.
NOTE This command is not available in I
2
C.
Remembered Yes
9.4 Poll Key Press
Syntax
Hexadecimal 0xFE 0x26
Decimal 254 38
ASCII 254 “&”
Description This command returns any buffered key presses via the serial interface.
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.
NOTE This command is not available in I
2
C. To read keys in I
2
C mode, one just needs
to address the module and read a byte. No preceding commands are necessary. If there are
no keys pressed the read will result in a 0x00.
Remembered No
9.5 Clear Key Buffer
Syntax
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.
Matrix Orbital LK204-25 37
- LK204-25 1
- Technical Manual 1
- Revision: 2.1 1
- Contents 2
- 1 Getting Started 5
- 1.2 Accessories 6
- Figure 4: Breadboard Cable 7
- Figure 5: Serial Cable 4FT 7
- Figure 7: Aluminum Mountings 7
- Matrix Orbital LK204-25 3 7
- Figure 8: Keypad Mountings 8
- Figure 9: Mounting Kits 8
- Figure 10: 4X4 Keypad 8
- Matrix Orbital LK204-25 4 8
- 1.3 Features 9
- 1.4 Connecting to a PC 9
- 1.5 Installing the Software 10
- 2 Hardware Information 11
- 2.1 DB-9 Connector 12
- 2.2 Power/Data Connector 14
- 2.3 Protocol Select Jumpers 14
- 2.4 General Purpose Outputs 15
- 2.5 Dallas 1-Wire Bridge 16
- 2.6 Manual Override 16
- 3 Troubleshooting 18
- 4 Communications 19
- C Transaction Example 20
- 4.2 Changing the I 21
- C Slave Address 21
- 4.3 Changing the Baud Rate 21
- CrystalSpeed 22
- 8×DesiredBaud 22
- 5.2 Auto Scroll On 24
- 5.3 Auto Scroll Off 25
- 5.4 Clear Screen 25
- 5.6 Set Auto Line Wrap On 26
- 5.7 Set Auto Line Wrap Off 26
- 5.8 Set Cursor Position 26
- 5.9 Go Home 27
- 5.10 Move Cursor Back 27
- 5.11 Move Cursor Forward 27
- 5.12 Underline Cursor On 28
- 5.13 Underline Cursor Off 28
- 5.14 Blinking Block Cursor On 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 Brightness 45
- 10.5 Set and Save Brightness 45
- 10.6 Set Contrast 45
- 10.7 Set and Save Contrast 46
- 11 Data Security 47
- 11.3 Data Lock 48
- 12 Miscellaneous 49
- 12.2 Read Version Number 50
- 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 56
- 13.9 Miscellaneous 56
- 13.10 Command By Number 56
- 14 Appendix 58
- Matrix Orbital LK204-25 55 59
- 14.3 Physical Layout 60
- 14.4 Ordering Information 61
- 14.5 Definitions 61
- 14.7 Revision History 62
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