Command / Comments

Suggested Pause

Example

send text

Serial.print("Hello World!");

?a

home cursor

Serial.print("?a");

?b

destructive backspace

Serial.print("?b"); // backspace

?c#

set cursor style,   0= none 2= blinking 3=underline

("?c0"); // turn cursor off

?f

clear screen

Serial.print("?f");

?g

Beep (requires speaker on pin 6)

Serial.print("?g");

?h

Backup Cursor (Non-destructive backspace)

Serial.print("?h");

?i

Forward cursor

Serial.print("?i");

?j

Up cursor

Serial.print("?j");

?k

Down cursor

Serial.print("?k");

?l

Clear cursor line

Serial.print("?k");

?m

Carriage Return

Serial.print("?m");

?n

CRLF, cursor at start of next line, line cleared

Serial.print("?n");

?s#

Set tabs at # spaces

100ms

Serial.print("?s7");
// set tab to 7 spaces

?t

Tab, advance one tab position

Serial.print("?t");

?x##

Position cursor on x column, (two characters are required), first column is column 0

Serial.print("?x09");
// cursor to column 10

?y#

Position cursor at y row, first row is row 0,
one digit only (no leading zero)

Serial.print("?y3");
// cursor to row 4

??

display a "?"

Serial.print("??");

?!

Send direct command to LCD

Serial.print("?!01");

?B

Backlight Intensity – sets PWM value, two hex digits req. (00 to FF)

100ms

Serial.print("?BFF");
// backlight on full brightness

?D#

Define Character "?D#1A001A001A001A00" D# = character
# 0-7 then 8 two character hex digits representing
(5 bit values top to bottom)

100ms

Serial.print("?D31F001F001F001F00");
//custom character 3, every other line black

?#

Print a custom character
numerals 0-7 are valid

5ms

Serial.print("?3);
// print custom character 3

?H

High output on auxiliary digital pins: valid numbers are 4,5,6

Serial.print("?H4");
// aux pin 4 HIGH

?L

Low output on auxiliary digital pins: valid numbers are 4,5,6

Serial.print("?L4");

// aux pin 4 LOW

?G

Configure for LCD geometry. Supported formats: 2X16, 2X20, 2X24, 2X40, 4X16 and 4X20.

Serial.print("?G216");
// configure driver for 2 x 16 LCD

Ganging up commands is OK, except for commands requiring a following  pause

Serial.print("?x01?y1?fHello World");
// cursor to beginning of line 1
// clear screen, print "Hello World"

Enhanced Commands

?>#

Enter BIG Number Mode (numbers only!) "?>3" X # = 3 or 4 ,

# represents number of characters displayed. (20x4 LCD's only)

100ms

Serial.print("?>4");
// enter big number mode, 4 character option.

?<

Exit BIG number mode "?<"

Serial.print("?<");

?C#

Define custom boot screen line # = 0 - 3

100ms

Serial.print("?C0abcdefghijklmnopqrst"

?S#

"?S1"  ' display the configuration setting on boot  "?S0"  ' display no screen on boot.  "?S2"  ' display the user custom text screen on boot.

Serial.print("?S2); //custom boot screen