Matrix Orbital LK202-25 Legacy - Manual (Page 2)

LK202-25 rev 3 2
Table of Contents
1. Introduction ....................................................................................................................4
1.1 What it Does ........................................................................................................................................... 4
1.2 What it Does Not Do ............................................................................................................................. 4
1.3 Keypad Interface..................................................................................................................................... 4
1.4 Setup for Testing .................................................................................................................................... 4
1.5 Trying Out your LK202-25 ................................................................................................................... 5
1.6 Trying out a Keypad................................................................................................................................ 6
1.6.1 Here's what to do: ........................................................................................................................ 6
1.7 To Reset the module .............................................................................................................................. 7
2. Connections....................................................................................................................8
2.1 Connector Pinout ................................................................................................................................... 8
2.1.1 Power and I
2
C Connections ........................................................................................................ 8
2.1.2 RS-232 Communications .......................................................................................................... 10
2.2 General Purpose Outputs..................................................................................................................... 10
3. Displaying Text.............................................................................................................. 13
3.1 General .................................................................................................................................................. 13
3.2 The Built-In Character Font ................................................................................................................. 13
3.3 Writing Text to the Display ................................................................................................................. 14
3.4 Text Commands .................................................................................................................................... 14
3.4.1 Auto line wrap on (254 67) (R) ................................................................................................ 14
3.4.2 Auto line wrap off (254 68) (R) ............................................................................................... 14
3.4.3 Auto scroll on (254 81) (R)...................................................................................................... 14
3.4.4 Auto scroll off (254 82) (R)..................................................................................................... 14
3.4.5 Set cursor position (254 71 [column] [row]) .......................................................................... 14
3.4.6 Send cursor home (254 72) ...................................................................................................... 14
3.4.7 Turn on underline cursor (254 74) (R) .................................................................................... 15
3.4.8 Turn off underline cursor (254 75) (R) ................................................................................... 15
3.4.9 Turn on block (blinking) cursor (254 83) (R) ......................................................................... 15
3.4.10
Turn off block (blinking) cursor (254 84) (R) ................................................................... 15
3.4.11 Cursor left (254 76).............................................................................................................. 15
3.4.12 Cursor right (254 77)............................................................................................................ 15
4. Keypad Interface ........................................................................................................... 16
4.1 General .................................................................................................................................................. 16
4.2 Connections .......................................................................................................................................... 16
4.3 I
2
C Interface.......................................................................................................................................... 17
4.4 RS-232 Interface .................................................................................................................................. 17
4.5 Keypad Commands ............................................................................................................................... 17
4.5.1 Auto repeat mode on (254 126 [mode]) (R) ........................................................................... 17
4.5.2 Auto repeat mode off (254 96) (R).......................................................................................... 18
4.5.3 Auto transmit keypresses on (254 65) (R) .............................................................................. 18
4.5.4 Auto transmit keypresses off (254 79) (R) ............................................................................. 18
4.5.5 Clear key buffer (254 69) ......................................................................................................... 18
4.5.6 Poll keypad (254 38)................................................................................................................. 18
4.5.7 Set debounce time (254 85 [time]) (R) ................................................................................... 18