Matrix-orbital LK204-25 Legacy Instrukcja Użytkownika Strona 14
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2.2 Power/Data Connector
The Power/Data Connector providesa standard connectorfor poweringthe displaymodule. The LK204-
25 requires five volts for the standard display module, between nine to fifteen for the wide voltage (V)
and between nine to thirty-five volts for the wide voltage with efficient power supply module (VPT). The
voltage is applied through pins one and four of the four pin Power/Data connector. Pins two and three are
reserved for serial transmission, using either the RS-232/TTL or the I
2
C protocol, depending on what has
been selected by the Protocol Select Jumpers.
Pin 1 PWR (See table 70 on page 54)
Pin
2 Rx \ SCL (I
2
C clock)
Pin
3 Tx \ SDA (I
2
C data)
Pin 4 GND
Figure 16: Power Connector and Pin out
WARNINGS
• Do not apply any power with reversed polarization.
• Do not apply any voltage other than the specified voltage.
2.3 Protocol Select Jumpers
The Protocol Select Jumpers, pictured below in figure 17, provide the means necessary to toggle the
display module between RS-232, TTL and I
2
C protocols. As a default, the jumpers are set to RS-232 mode
with solder jumps on the 232 jumpers. In order to place the display module in I
2
C mode you must first
remove the solder jumps from the 232 jumpers and then place them on the I2C jumpers. The display will
now be in I
2
C mode and have a default slave address of 0x50 unless it has been changed. Similarly, in order
to change the display to TTL mode, simply remove the zero ohm resistors from the 232 or I
2
C jumpers and
solder them to the TTL jumpers.
Matrix Orbital LK204-25 10
- 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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