1. RFID - EN
Encoding information
Encoding information
J.-D. Chatelain

2. What does mean a number like 8604?
RFID - EN
Encoding information
Almost whole Humanity today uses the same ten symbols called "Arabic numerals" and scored 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.
Counting
The ten symbols combined allow to represent any number that is said then expressed in base 10, or as decimal.
What does mean a number like 8604?
8604 = 8 times times times times 10 0
To represent numbers, men have first used the hand, which has led to the decimal base

3. What does mean a number like 1101?
RFID - EN
Encoding information 4 2 3 1 9 8 7 6 5
Imagine that instead of ten symbols, we do has only two, 0 and 1, called bits.
Counting
These two symbols, combined, can represent any number that is said then expressed in base 2, or in binary mode.
What does mean a number like 1101?
1101 = 1 times times times times 2 0 = 13
A binary numbering system is used in electronics because it is easy to determine whether a switch is open or closed.

4. What does mean a number like D3A?
RFID - EN
Encoding information 4 2 3 1 9 8 7 6 5
In computing, it has become customary to group the binary digits into words of eight bits or bytes
Counting
one byte
A byte allows to encode 2 8 = 256 different values. It is unthinkable to use a different symbol for each of 256 combinations allowed.
However, splitting the byte into two 4-bit words, each word can encode 2 4 = 16 combinations.
It is conceivable to assign a symbol to each of the 16 different values:
These symbols, combined, can represent any number that is said then expressed in base 16, or in hex mode
What does mean a number like D3A?
D3A = D(=13) times times A(=10) times 16 0 = 3386

5. Example: encoding M: Hex Binary 4 D 0100 1101
RFID - EN
Encoding information
ASCII (American Standard Code for Information Interchange) used for encoding alphanumeric characters in computer
Example: encoding M:
Hex
Binary 4 D
0100
1101

6. Encoding information End of this chapter J.-D. Chatelain RFID - EN