Matrix Orbital LK204-24-USB - Manual (Page 33)

7.1.1 Remember (254 147 [0|1])
This command allows a number of settings, such as cursor state, backlight, etc., to automatically be
stored in non-volatile memory, so they become new defaults. The command should only be used when
required for two reasons;
1. Writing to non-volatile memory is time consuming and slows down the operation of the display.
2. Non-volatile memory has a ’write limit’ and may only be changed approximately 100,00 times.
Commands which may be used with the remember function are marked with an "R" in the default column
in the command tables.
The example shows the procedure to set “Auto scroll on” as the default condition. Commands are shown
in both decimal and hex in the Table below.
Table 20: Command Example
Decimal Hex Function
254 147 1 FE 93 01 Turn on “Remember” function
254 81 FE 51 Turn on auto scroll. Since “Remem-
ber” is ON, this setting will be saved
in non-volatile memory
254 147 0 FE 93 00 Turn off “Remember” function
Any number of commands may be entered between the “Remember ON”, and “Remember OFF” com-
mands, and all settings will be memorized.
7.1.2 Clear display (254 88)
This command clears the display and resets the text insertion point to the top left of the screen.
7.1.3 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 the
backlight is off.
7.1.4 Set Contrast and save (254 145[contrast])
This command works in exactly the same way as the "Set contrast" command. The only difference is
that it saves the contrast value in the non-volatile memory of the module, whereas the previous command
Matrix Orbital LK204-24-USB 29