Matrix Orbital LCD/VFD Legacy - Manual (Page 19)

4.1.8 Place large digit (254 35 [col] [digit])
This command allows the large digits to be drawn on the display screen. Numbers of almost full display
height may be placed along side regular text on four row displays. The column number has a maximum
value which is less than the display width because the digits are all three columns wide. Before using this
command the Initialize Large Digits command must be issued to define the blocks necessary to make up the
digits. If regular text and large digits are mixed on one screen, the user should always set the display cursor
position before placing regular text because the creation of a large digit will leave the cursor position to the
bottom right of the large digit and not at the last regular text write position.
[col] can have values from 0x01 to 0x12 (1 to 18).
[digit] has values from 0x00 to 0x09 (0 to 9).
5 Miscellaneous Commands
The commands listed in this chapter don’t readily fit in any of the other categories, or are used in more
than one category.
5.1 Command List
5.1.1 Clear display (254 88)
This command clears the display and resets the text insertion point to the top left of the screen.
5.1.2 Set contrast (254 80 [contrast])
This command sets the display’s contrast to [contrast], where [contrast] is a value between 0x00 and
0xFF (between 0 and 255). Lower values cause ’on’ elements in the display area to appear lighter, while
higher values cause ’on’ elements to appear darker.
Lighting conditions will affect the actual value used for optimal viewing. Individual display modules
will also differ slightly from each other in appearance. In addition, values for optimal viewing while the
display backlight is on may differ from values used when backlight is off.
5.1.3 Backlight on (254 66 [minutes])
This command turns on the backlight for a time of [minutes] minutes. If [minutes] is zero (0), the
backlight will remain on indefinitely.
NOTE The factory default for backlight is on.
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