Set Debounce Time
ASCII 'U', Hex 55, Decimal 85
Syntax 0xFE 0x55<number to define debounce time>
To set the time between key press and key read, send a command prefix followed by the character 'U' and a number to
define the debounce time. All key types with the exception of latched piezo switches will"bounce" for a varying time,
depending on their physical characteristics. The default debounce time for the module is about 65mS, which is adequate
for most membrane keypads. This time equates to a setting of 8 using this command as there is a debounce time resolution
of 8192 microseconds.
Create Custom Character
ASCII 'N', Hex 4E, Decimal 78
Syntax 0xFE 0x4E<character between 0x00 and 0x07><8 bytes>
This command creates a custom character. For the LK202-25 the user can have up to eight custom characters. To execute
this command, send a command prefix followed by the character 'N'. The display will now await the number which identi-
fies the custom character. This number must be between 0x00 and 0x07. When the module determines what character it's
working on, then the user must send 8 bytes which define the display character. See the diagram below for and explanation
of the display character structure.
Diagram A
MSB LSB
*
* *
1 2 3 4 5 Data Byte 1
*
* *
6 7 8 9 10 Data Byte 2
*
* *
11
12 13
14 15 Data Byte 3
*
* *
16
17 18
19 20 Data Byte 4
*
* *
21
22 23
24 25 Data Byte 5
*
* *
26
27 28
29 30 Data Byte 6
*
* *
31
32 33
34 35 Data Byte 7
*
* *
36
37 38
39 40 Data Byte 8
Pixel Layout of Display Characters
General Purpose Output On
ASCII ' V', Hex 56, Decimal 86
Syntax 0xFE 0x56<hex number corresponding to output>
To turn a general output purpose on, send a command prefix followed by the character 'V' and hex number which corre-
sponds to the output which will be turned on. To turn on output five, the sequence would be:
<command prefix> 0xFE
<command> 0x56
<hex number corresponding to output> 05H
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
16 17 18 19 20
21 22 23 24 25
26 27 28 29 30
31 32 33 34 35
36 37 38 39 40
Cursor Line
11
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