Matrix Orbital LK204-25 Legacy - Manual (Page 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 LK204-25................................................................................................................. 5
1.6 Trying out a Keypad............................................................................................................................ 6
1.6.1 Here's what to do:...................................................................................................................... 6
2. Connections.............................................................................................................................. 7
2.1 Connector Pinout................................................................................................................................. 7
2.1.1 Power and I2C Connections...................................................................................................... 7
2.1.2 RS-232 Communications...........................................................................................................9
2.1.3 Configuring RS-232 and I2C.................................................................................................. 10
2.1.4 I2C Communications...............................................................................................................11
2.2 General Purpose Outputs...................................................................................................................11
3. Displaying Text........................................................................................................................ 14
3.1 General.............................................................................................................................................. 14
3.2 The Built-In Character Font.............................................................................................................. 14
3.3 Writing Text to the Display............................................................................................................... 15
3.4 Text Commands.................................................................................................................................15
3.4.1 Auto line wrap on (254 67)..................................................................................................... 15
3.4.2 Auto line wrap off (254 68).....................................................................................................15
3.4.3 Auto scroll on (254 81)........................................................................................................... 15
3.4.4 Auto scroll off (254 82)...........................................................................................................15
3.4.5 Set cursor position (254 71 [column] [row])...........................................................................15
3.4.6 Send cursor home (254 72)..................................................................................................... 15
3.4.7 Turn on underline cursor (254 74).......................................................................................... 16
3.4.8 Turn off underline cursor (254 75)..........................................................................................16
3.4.9 Turn on block (blinking) cursor (254 83)............................................................................... 16
3.4.10 Turn off block (blinking) cursor (254 84).............................................................................16
3.4.11 Cursor left (254 76)...............................................................................................................16
3.4.12 Cursor right (254 77).............................................................................................................16
4. Keypad Interface..................................................................................................................... 17
4.1 General.............................................................................................................................................. 17
4.2 Connections....................................................................................................................................... 17
4.3 I2C Interface......................................................................................................................................18
4.4 RS-232 Interface................................................................................................................................18
4.5 Keypad Commands............................................................................................................................18
4.5.1 Auto repeat mode on (254 126 [mode]) .................................................................................18
4.5.2 Auto repeat mode off (254 96)................................................................................................19
4.5.3 Auto transmit keypresses on (254 65)..................................................................................... 19
4.5.4 Auto transmit keypresses off (254 79).................................................................................... 19
4.5.5 Clear key buffer (254 69)........................................................................................................ 19
4.5.6 Poll keypad (254 38)............................................................................................................... 19
LK204-25 rev 1 2