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Connector Pinout http://lcd.sourceforge.net/

1 Front Panel button (pulls to ground) 11 N/C

2 Backlight control 12 Ground

3 N/C 13 D0

4 LCD Display Bias 14 D1

5 Register Select (RS) 15 D2

6 Read/Write Select (R/W) 16 D3

7 Chip Enable Controller 1 (EN1) 17 D4

8 Chip Enable Controller 2 (EN2) 18 D5

9 N/C 19 D6

10 N/C 20 D7

Protocol details

All characters other than those below are written to the data register of the current display

controller. Where the following values are to be written to the data register, the 0xFF escape

described below should be used.

Character Action

^G (0x7) Next character determines the level of the external output '0' for 0V, '1' for 5V

^I (0x9)

Next character determines if the cursor wraps within the displays geometry ('0' for

no, '1' for yes) This applies within each controller only - the display will always

wrap between controllers if more than one is present

^J (0xA) Line feed - cursor moves to same position in next line

^K (0xB)

Set display Geometry - takes 4 characters as data.

- First character specifies the number of controllers ('1' or '2')- Second character specifies the number of lines per controller ('1' or '2')

- Next two character specify the number of display columns in hex

eg. ^K1210 specifies a 16x2 display with 1 controller

Once the geometry has been received the controller(s) are re-initialised and the

display cleared. This takes about 1 second. If the second controller cannot be found

then the same geometry is used, but the number of controllers is assumed to be 1.

^L (0xC) Form feed - clear display

^M (0xC) Carriage return - return to the start of the current line^N (0xC) Report display geometry - outputs a string to the serial port 'G' where

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a, b and nn are the parameters as specified in ^K above.

ESC

(0x1b)

Position cursor - takes a single character to specify the cursor position; bit 7 6 5 4 3 2 1 0

; +---+---+---+---+---+---+---+----+

; | D | L | character offset |

; +---+---+---+---+---+---+---+----+;

; b7 - selects display

; b6 - selects display line

; b5-b0 - selects character offset into current line

0xFE

Control register passthrough. Takes next two characters as arguments. The first '1'

or '2' specifies the controller to write the next character to. The character is written

into the control register. This can be used for switching the visible cursor on/off etc.

0xFFData pass through - as per 0xFE except the data register is written to. Can be used

for programming and displaying used specific fonts (see HD74480 data sheet)