PK202-25 Matrix Orbital, PK202-25 Datasheet - Page 38

• Manufacturer Part Number: PK202-25
• Description: LCD Character Display Modules Black Background Yel/Grn Text
• Manufacturer: Matrix Orbital
• Series: PK202-25r

Specifications of PK202-25

• Character Count X Line: 20 x 2
• Module Size (w X H X T): 116 mm x 37 mm x 25.73 mm
• Background Color: Black
• Backlight Type: LED Yellow / Green
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.3 On Numbers
numbers. These binary numbers are arranged in 8 digit (i.e., 8 bit) groups called bytes. The decimal value
of a byte may have any value from 0 to 255.
numbers are confusing to deal with directly. Hexadecimal (hex) numbers are particularly convenient because
exactly two hexadecimal digits make up one byte, each hex digit representing 4 binary digits (4 bits) as shown
here;
of 4Bh, 4BH, 4B hex or 0x4B.
8.3.1 ASCII Characters
schemes were developed to ‘map’ written characters to numeric values. One such scheme has become
universal, the American Standard Code for Information Interchange, or ASCII. ASCII tables are readily
available from a number of sources. A few examples will do here:
Matrix Orbital
Like all computerized devices, the display operates with commands and values in the form of binary
Bytes are usually specified in either decimal or hexadecimal (base 16) form for convenience, since binary
Based on the table, the byte 01001011 can be represented in hex as 4B, which is usually written as any
The numbers can also be expressed in decimal form if preferred.
Since computers deal internally with numbers only, but externally with both letters and numbers, several
Binary
0000
0001
0010
0011
0100
0101
0110
0111
Hex
0
1
2
3
4
5
6
7
Table 20: Hex Value Table
Decimal
0
1
2
3
4
5
6
7
PK202-25
Binary
1000
1001
1010
1011
1100
1101
1110
1111
Hex
A
D
B
C
E
F
8
9
Decimal
10
11
12
13
14
15
8
9
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